SHTC3

SHTC3 SENSIRION | Alldatasheet

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www.sensirion.com Version 4 – December 2022 1/14 Datasheet SHTC3 Humidity and Temperature Sensor IC ▪ Ultra-low power consumption ▪ Full battery supply voltage range (1.62 - 3.6 V) ▪ Small DFN package: 2 × 2 × 0.75 mm3 ▪ Typical accuracy: ±2 %RH and ±0.2 °C ▪ Fully calibrated and reflow solderable ▪ Power-up and measurement within 1 ms ▪ NIST traceability Benefits of Sensirion’s CMOSens® Technology ▪ High reliability and long-term stability ▪ Industry-proven technology with a track record of more than 15 years ▪ Designed for mass production ▪ Optimized for lowest cost ▪ High signal-to-noise ratio Contents of this Data Sheet

1 Humidity and Temperature Sensor

Figure 1 Functional block diagram of the SHTC3. RH sensor T sensor Signal conditioning Signal conditioning ADC I2C interface Calibration mem. VDD VSS SDA SCL Data processing and system control analog digital Product Summary The SHTC3 is a digital humidity and temperature sensor designed especially for battery-driven high-volume consumer electronics applications. This sensor is strictly designed to overcome conventional limits for size, power consumption, and performance to price ratio in order to fulfill current and future requirements. Sensirion’s CMOSens® technology offers a complete sensor system on a single chip, consisting of a capacitive humidity sensor, a bandgap temperature sensor, analog and digital signal processing, A/D converter, calibration data memory, and a digital communication interface supp orting I2C Fast Mode Plus. The small 2 × 2 × 0.75 mm3 DFN package enables applications in even the most limited of spaces. The sensor covers a humidity measurement range of 0 to 100 %RH and a temperature measurement range of - 40 °C to 125 °C with a typical accuracy of ±2 %RH and ±0.2°C. The broad supply voltage of 1.62 V to 3.6 V and an energy budget below 1 µJ per measurement make the SHTC3 suitable for mobile o r wireless applications powered by batteries. With the industry-proven quality and reliability of Sensirion’s humidity and temperature sensors and constant accuracy over a large measurement range, the SHTC3 o ffers best performance-to-price ratio. Tape and reel packaging together with suitability for standard SMD assembly processes make the SHTC3 predestined for high-volume applications.

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1 Humidity and T emperature Sensor

Every SHTC3 is individually tested and calibrated and is identifiable by its unique serial number. The serial number is stored in an unchangeable OTP memory. For the calibration, Sensirion uses transfer standards, which are subject to a scheduled calibration procedure. The calibration of the reference, used for the calibration of the transfer standards, is NIST traceable through an ISO/IEC 17025 accredited laboratory. Relative Humidity Parameter Condition Value Unit Accuracy tolerance1 Typ. 2.0 %RH Max. see Figure 2 %RH Repeatability2 - 0.1 %RH Resolution3 - 0.01 %RH Hysteresis - 1 %RH Specified range4 extended5 0 to 100 %RH Response time6  63% 8 s Long-term drift7 Typ. <0.25 %RH/y Table 1 Humidity sensor specifications. 1 For definition of typ. and max. accuracy tolerance, please refer to the document “Sensirion Humidity Sensor Specification Statement”. Specification applies to normal mode.

2 The stated repeatability is 3 times the standard deviation (3σ) of multiple

consecutive measurement values at constant conditions and is a measure for the noise on the physical sensor output. Specification applies to normal mode. 3 Resolution of A/D converter. Specification applies to normal mode.

4 Specified range refers to the range for which the humidity or temperature sensor

specification is guaranteed.

5 For details about recommended humidity and temperature operating range, please

refer to section 1.2. Figure 2 Typical and maximal tolerance for relative humidity in %RH at 25 °C. Temperature Parameter Condition Value Unit Accuracy tolerance1 Typ. 0.2 °C Max. see Figure 3 °C Repeatability2 - 0.1 °C Resolution3 - 0.01 °C Specified range4 - –40 to +125 °C Response time8  63% <5 to 30 s Long-term drift 9 Typ. <0.02 °C/y Table 2 Temperature sensor specifications. Figure 3 Typical and maximal tolerance for temperature sensor in °C.

6 Time for achieving 63% of a humidity step function, valid at 25°C and 1 m/s

airflow. Humidity response time in the application depends on the design-in of the sensor. 7 Typical value for operation in normal RH/T operating range. Max. value is < 0.5 %RH/y. Value may be higher in environments with vaporized solvents, out- gassing tapes, adhesives, packaging materials, etc. For more d etails please refer to Handling Instructions.

8 Temperature response time depends on heat conductivity of sensor

substrate and design-in of sensor in application. 9 Max. value is < 0.04°C/y. 0 10 20 30 40 50 60 70 80 90 100 ΔRH [%RH] Relative humidity [%RH] Maximum accuracy Typical Accuracy ±0.4 ±0.8 ±1.2 ±1.6 -40 -20 0 20 40 60 80 100 120 ΔT [C] Temperature [°C] Maximum Accuracy Typical Accuracy

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1.1 RH Accuracy at Various Temperatures

Typical RH accuracy at 25°C is defined in Figure 2. For other temperatures, typical accuracy has been evaluated to be as displayed in Figure 4. Figure 4 Typical accuracy of relative humidity measurements given in %RH for temperatures 0°C … 80°C.

1.2 Recommended Operating Conditions

The sensor performs best when operated within the recommended normal temperature and humidity range of 5 – 60 °C and 20 – 80 %RH, respectively. Long-term exposure to conditions outside the normal range, especially at high humidity, may temporarily offset the RH signal ( e.g. +3%RH after 60h at >80%RH). After returning to normal temperature and humidity range the sensor will slowly come back to its calibration state by itself. Prolonged exposure to extreme conditions may accelerate ageing. To ensure stable operation of the humidity sensor, please refer to the Ha ndling Instructions SHT. Please note as well that this does apply not only to transportation and manufacturing, but also to operation of the SHTC3.

2 Electrical Specifications

2.1 Electrical Characteristics

Default conditions of 25 °C and 3.3 V supply voltage apply to values in the table below, unless otherwise stated. Parameter Symbol Conditions Min Typ. Max Units Comments Supply voltage VDD 1.62 3.3 3.6 V - Power-up/down level VPOR Static power supply 1.28 1.4 1.55 V - Supply current IDD Idle state - 45 70 µA After power-up the sensor remains in the idle state unless a sleep command is issued or other data transmission is active Sleep Mode - 0.3 0.6 µA When in sleep mode, the sensor requires a dedicated wake-up command to enable further I2C communication Measurement Normal Mode - 430 900 µA Average current consumption while the sensor is measuring Low Power M. - 270 570 µA Average Normal Mode - 4.9 - µA Average current consumption (continuous operation with one measurement per second) Low Power M. - 0.5 - µA Average current consumption (continuous operation with one measurement per second) Low level input voltage VIL - - - 0.42 VDD V - High level input voltage VIH - 0.7 VDD - - V - Low level output voltage VOL 3 mA sink current - - 0.2 VDD V - Table 3 Electrical specifications. 0 10 20 30 40 50 60 70 80 Relative Humidity [%RH] Temperature [°C]

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2.2 Absolute Maximum Ratings

Stress levels beyond the limits listed in Table 4 may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these conditions cannot be guaranteed. Exposure to the absolute maximum rating conditions for extended periods may affect the reliability of the device. Parameters are only tested each at a time. Parameter Rating Supply voltage, VDD -0.3 to +4 V Operating temperature range -40 to +125 °C Storage temperature range10 -40 to +125 °C ESD HBM (human body model)11 -2 to 2 kV ESD CDM (change device model)12 -500 to 500 V Latch up, JESD78 Class II, 125°C -100 to 100 mA Table 4 Absolute maximum ratings.

3 Timing Specifications

3.1 Sensor System Timings

Default conditions of 25 °C and 3.3 V supply voltage apply to values the table below, unless otherwise stated. Max. values are measured at -40 °C. Parameter Symbol Conditions Min. Typ. Max. Units Comments Power-up time tPU After hard reset, VDD ≥ VPOR - 180 240 µs Time between VDD reaching VPU and sensor entering the idle state Soft reset time tSR After soft reset. - 180 240 µs Time between ACK of soft reset command and sensor entering the idle state Measurement duration tMEAS Average Normal Mode - 10.8 12.1 ms Duration for a humidity and temperature measurement Low Power M. - 0.7 0.8 Table 5 System timing specifications. 10 The recommended storage temperature range is 10-50°C. Please consult the document “SHTxx Handling Instructions” for more information. 11 According to ANSI/ESDA/JEDEC JS-001-2014; AEC-Q100-002. 12 According to ANSI/ESD S5.3.1-2009; AEC-Q100-011.

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3.2 Communication Timings

Default conditions of 25 °C and 3.3 V supply voltage apply to values in the table below, unless otherwise stated. Parameter Symbol Conditions Standard-mode Fast-mode Fast-mode Plus Units SCL clock frequency fSCL - 0 100 0 400 0 1000 kHz Hold time (repeated) START condition tHD;STA After this period, the first clock pulse is generated LOW period of the SCL clock tLOW - 4.7 - 1.3 - 0.5 - µs HIGH period of the SCL clock tHIGH - 4.0 - 0.6 - 0.26 - µs Set-up time for a repeated START condition tSU;STA - 4.7 - 0.6 - 0.26 - µs SDA hold time tHD;DAT - 0 - 0 - 0 - µs SDA set-up time tSU;DAT - 250 - 100 - 50 - ns SCL/SDA rise time tR - - 1000 20 300 - 120 ns SCL/SDA fall time tF - - 300 20 x (VDD / 5.5V) 300 20 x (VDD / 5.5V 120 ns SDA valid time tVD;DAT - - 3.45 - 0.9 - 0.45 µs Set-up time for STOP condition tSU;STO - 4.0 - 0.6 - 0.26 - µs Capacitive load on bus line CB - - 400 - 400 - 550 pF Table 6 Communication timing specifications. The numbers above are values according to the I2C specification. Figure 5 Timing diagram for digital input/output pads. SDA directions as seen from the sensor. Bold SDA lines are controlled by the sensor, plain SDA lines are controlled by the micro-controller. Note that SDA valid read time is triggered by falling edge of preceding toggle. SCL 70% 30% tLOW 1/fSCL tHIGH tR tF SDA 70% 30% tSU;DAT tHD;DAT DATA IN tR SDA 70% 30% DATA OUT tVD;DAT tF

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4 Interface Specifications

The SHTC3 supports I 2C Normal, Fast Mode and Fast Mode Plus (SCL clock frequency from 0 to 1 M Hz) with clock stretching. Please choose the protocol most suited to your application and refer to its specific specifications. For detailed information on the I2C protocol, refer to NXP I2C- bus specification and user manual UM10204, Rev. 6, April 4th, 2014. The SHTC3 comes in a 4-pin package – see Table 7. Pin Name Comments

1 VDD Supply voltage

2 SCL Serial clock, bidirectional

3 SDA Serial data, bidirectional

4 VSS Ground

Table 7 SHTC3 pin assignment (top view) . The center pad is internally connected to VSS. Power-supply pins supply voltage (VDD) and ground (VSS) must be decoupled with a 10 0 nF capacitor that shall be placed as close to the sensor as possible – see Figure 6. SCL is used to synchronize the communication between the microcontroller and the sensor. The master must keep the clock frequency within 0 to 1 MHz as specified in Table 6. The SHTC3 may pull down the SCL line when clock stretching is enabled. The SDA pin is used to transfer data in and out of the sensor. For safe communication, the timing specifications defined in the I2C manual must be met. To avoid signal contention, the microcontroller must only drive SDA and SCL low. External pull -up resistors (e.g. 10 kΩ) are required to pull the signal high. For dimensioning resistor sizes please take the bus capacity requirements into account. Note that pull-up resistors may be included in I/O circuits of microcontrollers. Figure 6 Typical application circuit, including pull-up resistors RP and decoupling of VDD and VSS by a capacitor. For good performance of the SHTC3 in the application, the center pad of the SHTC3 offers the best thermal contact to

13 If an immediate sensor signal is desired, sending the sensor to sleep mode

can be omitted. Not sending the sensor to sleep mode for an extended amount of time keeps up the current consumption of the sensor. the temperature sensor. For more information on design-in, please refer to the document “SHTxx Design Guide”. For mechanical reasons the center pad should be soldered. Electrically, the center pad is internally connected to GND and may be connected to the GND net on the PCB additionally.

5 Operation and Communication

All commands and memory locations of the SHTC3 are mapped to a 16-bit address space which can be accessed via the I2C protocol.

5.1 I2C Address

The I2C device address is given Table 8: SHTC3 Hex. Code Bin. Code I2C address 0x70 111’0000 Table 8 SHTC3 I2C device address. Each transmission sequence begins with START condition (S) and ends with an (optional) STOP condition (P) as described in the I2C-bus specification.

5.2 Power-Up, Sleep, Wakeup

Upon VDD reaching the power -up voltage level V POR, the SHTC3 enters the idle state after a duration of tPU. After that, the sensor should be set to sleep mode with the command given in Table 913. Command Hex. Code Bin. Code Sleep 0xB098 1011’0000’1001’1000 Table 9 Sleep command of the sensor. When the sensor is in sleep mode, it requires the following wake-up command before any further communication, see Table 10: Command Hex. Code Bin. Code Wakeup 0x3517 0011’0101’0001’0111 Table 10 Wake-up command of the sensor.

5.3 Measurement Commands

The SHTC3 provides a clock -stretching option and the order of the signal return can be selected. These parameters are selected by dedicated measurement commands as summarized in Table 11. N. B.: Each measurement command triggers always both, a temperature and a relative humidity measurement. SHTC3 AXY89 SDA SCL GND VDD MCU (master) RP RP SCL OUT SDA OUT SDA IN SCL IN C = 100 nF SHTC3 (slave) SHTC AXY8

www.sensirion.com Version 4 – December 2022 7/14 Clock Stretching Enabled Clock Stretching Disabled Read T First Read RH First Read T First Read RH First Normal Mode 0x7CA2 0x5C24 0x7866 0x58E0 Low Power M. 0x6458 0x44DE 0x609C 0x401A Table 11 Measurement commands.

5.4 Measuring and Reading the Signals

Each measurement cycle contains a set of four commands, each initiated by the I2C START condition and ended by the I2C STOP condition: 1. Wakeup command 2. Measurement command 3. Read out command 4. Sleep command An exemplary measurement set is shown in Figure 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 S ACK ACK ACK P SHTC3 wake up 1 1 1 0 0 0 0 0 0 0 1 1 0 1 0 1 0 0 0 1 0 1 1 1 I2C address + write Wakeup command MSB Wakeup command LSB Wakeup time see Table 5 28 29 30 31 32 33 34 35 36 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 ACK ACK ACK P SHTC3 measuring S 1 1 1 0 0 0 0 0 0 1 0 1 1 1 0 0 0 0 1 0 0 1 0 0 I2C address + write Measurement command MSB Measurement command LSB Measurement in progress 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 S NACK P SHTC3 measuring SHTC3 in idle state S ACK 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 repeated I2C address + read while meas. is in prog. (polling) measurement cont’d measurement completed I2C address + read 56 57 58 59 60 61 62 63 64 S ACK SHTC3 measuring, SCL line pulled low 1 1 1 0 0 0 0 1 I2C address + read while meas. is in progress measurement continued 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ACK ACK ACK 1 0 1 0 0 0 0 1 0 0 1 1 0 0 1 1 0 0 0 1 1 1 0 0 Humidity MSB Humidity LSB Humidity CRC checksum 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 ACK ACK ACK P 0 1 1 0 0 1 0 0 1 0 0 0 1 0 1 1 1 1 0 0 0 1 1 1 Temperature MSB Temperature LSB Temperature CRC checksum 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 S ACK ACK ACK P 1 1 1 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 0 1 1 0 0 0 I2C address + write Sleep command MSB Sleep command LSB Figure 7 Communication sequence for waking up the sensor, starting a measurement and reading measurement results displaying both clock stretching options. The numerical example corresponds to a read humidity -first command with clock stretching enabled. The physi cal values of the transmitted measurement results are 63 %RH and 23.7 °C. Clear blocks are controlled by the microcontroller, grey blocks by the SHTC3. clock stretching disabled clock stretching enabled

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5.5 Sensor Behavior during Measurement and

In general, the sensor does not respond to any I2C activity during measurement, i.e. I2C read and write headers are not acknowledged (NACK). However, when clock stretching has been enabled by using a corresponding measurement command, the sensor responds to a read he ader with an ACK and subsequently pulls down the SCL line until the measurement is complete. As soon as the measurement is complete, the sensor starts sending the measurement results. During measurement, the sensor has a current consumption according to Table 3. For best possible repeatability of humidity and temperature measurements, it is recommended to avoid any communication on the I2C bus while the SHTC3 is measuring. For more information, see the application note “Optimization of Repeatibility”.

5.6 Readout of Measurement Results

After a measurem ent command has been issued and the sensor has completed the measurement, the master can read the measurement results by sending a START condition followed by an I2C read header. The sensor will acknowledge the reception of the read header and send two bytes of data followed by one byte CRC checksum and another two bytes of data followed by one byte CRC checksum. Each byte must be acknowledged by the microcontroller with an ACK co ndition for the sensor to continue sending data. If the SHTC3 does not receive an ACK from the master after a ny byte of data, it will not continue sending data. The I2C master can abort the read transfer with a NACK condition after any data byte if it is not interested in subsequent data, e.g. the CRC byte or the second measurement result, in order to save time. In case the user needs humidity and temperature data but does not want to process CRC data, it is recommended to read the first two bytes of data with the CRC byte (without processing the CRC data) and abort the read transfer after reading the second two data bytes with a NACK. This procedure is more time efficient than starting two different measurements and aborting the read transfer after the first two data bytes each time.

5.7 Soft Reset

The SHTC3 provides a soft reset mechanism that forces the system into a well-defined state without removing the power supply. If the system is in its idle state (i.e. if no measurement is in progress) the soft reset command can be sent to SHTC3 according to Table 12. This triggers the 14 http://www.nxp.com/documents/user_manual/UM10204.pdf sensor to reset all internal state machines and reload calibration data from the memory. Command Hex. Code Bin. Code Software reset 0x805D 1000’0000’0101’1101 Table 12 Soft reset command.

5.8 Reset through General Call

Additionally, a reset of the sensor can also be generated using the “general call” mode according to I2C -bus specification14. This generates a reset which is functionally identical to using the nReset pin. It is important to understand that a reset generated in this way is not device specific. All devices on the same I2C bus that support the general call mode will perform a reset. Additionally, this command only works when the sensor is able to process I2C commands. The appropriate command consists of two bytes and is shown in Table 13. Command Code Address byte 0x00 Second byte 0x06 Reset command using the general call address 0x0006 Table 13 Reset through the general call address (clear blocks are controlled by the microcontroller, grey blocks by the sensor)

5.9 Read-out of ID Register

The SHTC3 has an ID register which contains an SHTC3- specific product code. The read -out of the ID register can be used to verify the presence of the sens or and proper communication. The command to read the ID register is shown in Table 14. Command Hex. Code Bin. Code Read ID register 0xEFC8 1110’1111’1100’1000 Table 14 Read-out command of ID register. It needs to be sent to the SHTC3 after an I2C write header. Once the SHTC3 has acknowledged the proper reception of the command, the master can send an I2C read header and the SHTC3 submits the 16-bit ID followed by 8 bits of CRC. The structure of the ID is described in Table 15. S ACKGeneral Call Address 1 2 3 4 5 6 7 8 9 ACKReset Command 1 2 3 4 5 6 7 8 9 General Call 1st byte General Call 2nd byte

www.sensirion.com Version 4 – December 2022 9/14 16-bit ID bits 15 to 12 & 10 to 6: unspecified info. xxxx' 1 xxx’xx 00’0111 bits 11 & 5 to 0: SHTC3 identifier. Table 15 Structure of the 16 -bit ID. Bits 15:12 & 10:6 of the ID contain unspecified information ( marked as “x”), which may vary from sensor to sensor, while bits 11 & 5:0 contain the SHTC3- specific product code.

5.10 Checksum Calculation

The 8-bit CRC checksum transmitted after each data word is generated by a CRC algorithm with the properties displayed in Table 16. The CRC covers the contents of the two previously transmitted data bytes. Property Value Name CRC-8 Width 8 bits Polynomial 0x31 (x8 + x5 + x4 + 1) Initialization 0xFF Reflect input False Reflect output False Final XOR 0x00 Examples CRC (0x00) = 0xAC CRC (0xBEEF) = 0x92 Table 16 SHTC3 I2C CRC properties.

5.11 Conversion of Sensor Output

Measurement data is always transferred as 16 -bit values. These values are already linearized and temperature compensated by the SHTC3. Humidity and temperature values can be calculated with the formulas in given below. Relative humidity conversion formula (result in %RH): RH S 100 RH = Temperature conversion formula (result in °C): T S 175 45 T +−= SRH and S T denote the raw sensor output (as decimal values) for humidity and temperature, respectively.

6 Quality

6.1 Environmental Stability

Qualification of the SHTC3 is performed based on the JEDEC JESD47 qualification test method.

6.2 Material Contents

The device is fully RoHS , REACH and Halogen -Free compliant, e.g. free of Pb, Cd, and Hg.

7 Packaging and Traceability

SHTC3 sensors are provided in a DFN package with an outline of 2 × 2 × 0.75 mm3 and a terminal pitch of 1 mm. DFN stands for dual flat no leads. The humidity sensor opening is centered on the top side of the package. The sensor chip is made of silicon and is mounted to a lead frame. The latter is made of Cu plated with Ni/Pd/Au. Chip and lead frame are overmolded by an epoxy-based mold compound. Please note that the sidewalls of sensor are diced and therefore these diced lead frame surfaces are not covered with the respective plating. The Moisture Sensitivity Level classification of the SHTC3 is MSL1, according to IPC/JEDEC J-STD-020. All SHTC3 sensors are laser marked for easy identification and traceability. The marking on the sensor consists of two lines and a pin-1 indicator. The top line contains the sensor type ( SHTC3), the bottom line contains a 5 -digit, alphanumeric tracking code. The pin -1 indicator is located in the top left corner. See Figure 8 for illustration. Figure 8 Laser marking on SHTC3, the top line with the pin -1 indicator and the sensor type, the bottom line with the 5-digit alphanumeric tracking code. Reels are also labeled and provide additional traceability information.

8 Ordering Information

The SHTC3 can be ordered in tape and reel packaging with different sizes, see Table 17. The reels are sealed into antistatic ESD bags. A drawing of the packagin g tape with sensor orientation is shown in Figure 11. Quantity Packaging Reel Diameter Order Number 2500 Tape & Reel 180 mm (7 inch) 3.000.047 10’000 Tape & Reel 330 mm (13 inch) 1-101681-01 Table 17 SHTC3 ordering options. SHTC3 XXXXX

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9 Technical Drawings

9.1 Package Outline

Figure 9 Package outline drawing of the SHTC3. Parameter Symbol Min Nom. Max Units Comments Package height A 0.7 0.75 0.8 mm - Leadframe height A3 - 0.15 - mm - Pad width b 0.3 0.35 0.4 mm - Package width D 1.9 2 2.1 mm - Center pad length D2 1.5 1.6 1.7 mm - Package length E 1.9 2 2.1 mm - Center pad width E2 0.6 0.7 0.8 mm - Pad pitch e - 1 - mm - Pad length L 0.3 0.35 0.4 mm - Max cavity S - - 1 mm Mold opening shows smooth transition to package surface. Therefore this dimension is not well defined and given for reference only. Center pad marking T1xT2 - 0.2x45° - mm indicates the position of pin 1 Table 18 Package outline dimensions and tolerances. A e T1xT2 b L D E * Mold opening shows smooth transition to package surface. Therefore this dimension is not well defined and given for reference only.

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9.2 Metal Land Pattern

Figure 10 Recommended metal land pattern for SHTC3 (all dimensions are in mm). Recommended solder paste stencil thickness is 100 µm, pads on PCB are recommended to be non solder mask defined (NSMD).

9.3 Tape and Reel Package

Figure 11 Technical drawing of the packaging tape with sensor orientation in tape. Header tape is to the right and trailer tape to the left on this drawing. Dimensions are given in millimeters.

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10 Further Information

For more in-depth information on the SHTC3 and its application please consult the following documents: Document Name Description Source SHTxx Design Guide Design guidelines for designing SHTxx humidity sensors into applications Available for download at the Sensirion humidity sensors download center: www.sensirion.com/humidity-download SHTxx Handling Instructions Guidelines for proper handling of SHTxx humidity sensors Available for download at the Sensirion humidity sensors download center: www.sensirion.com/humidity-download Sensirion Humidity Sensor Specification Statement Definition of sensor specifications. Available for download at the Sensirion humidity sensors download center: www.sensirion.com/humidity-download Table 19 Documents containing further information relevant for the SHTC3.

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Revision History

Date Version Page(s) Changes July 2018 1 all Initial version January 2019 1.1 5 Added explicit specifications of normal and fast I2C mode. June 2019 2 1, 2 Added statement on NIST traceability January 2021 3 10 Added dimension tolerances, updated “Important Notices”. December 2022 4 12 Updated Table 19 due to obsolete document: Information covered now in handling instructions. Also changed reference in text to reference to the handling instruction.

www.sensirion.com Version 4 – December 2022 14/14 Important Notices Warning, Personal Injury Do not use this product as safety or emergency stop devices or in any other application where failure of the product could result in personal injury. Do not use this product for applications other than its intended and authorized use. Before installing, handling, using or servicing this product, please consult the data sheet and application notes. Failure to comply with these instructions could result in death or serious injury. If the Buyer shall purchase or use SENSIRION products for any unintended or unauthorized application, Buyer shall defend, indemnify and hold harmless SENSIRION and its officers, employees, subsidiaries, affiliates and distributors against all claims, costs, damages and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if SENSIRION shall be allegedly negligent with respect to the design or the manufacture of the product. ESD Precautions The inherent design of this component causes it to be sensitive to electrostatic discharge (ESD). To prevent ESD-induced damage and/or degradation, take customary and statutory ESD precautions when handling this product. See application note “ESD, Latchup and EMC” for more information. Warranty SENSIRION warrants solely to the original purchaser of this product for a period of 12 months (one year) from the date of delivery that this product shall be of the quality, material and workmanship defined in SENSIRION’s published specifications of the product. Within such period, if proven to be defective, SENSIRION shall repair and/or replace this product, in SENSIRION’s discretion, free of charge to the Buyer, provided that:

• notice in writing describing the defects shall be given to SENSIRION within fourteen (14) days after their appearance;
• such defects shall be found, to SENSIRION’s reasonable satisfaction, to have arisen from SENSIRION’s faulty design, material, or workmanship;
• the defective product shall be returned to SENSIRION’s factory at the Buyer’s expense; and
• the warranty period for any repaired or replaced product shall be limited to the unexpired portion of the original period. This warranty does not apply to any equipment which has not been installed and used within the specifications recommended by SENSIRION for the intended and proper use of the equipment. EXCEPT FOR THE WARRANTIES EXPRESSLY SET FORTH HEREIN, SENSIRION MAKES NO WARRANTIES, EITHER EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT. ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION, WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY EXCLUDED AND DECLINED. SENSIRION is only liable for defects of this product arising under the conditions of operation provided for in the data sheet and proper use of the goods. SENSIRION explicitly disclaims all warranties, express or implied, for any period during which the goods are operated or stored not in accordance with the technical specifications. SENSIRION does not assume any liability arising out of any application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. All operating parameters, including without limitation recommended parameters, must be validated for each customer’s applications by customer’s technical experts. Recommended parameters can and do vary in different applications. SENSIRION reserves the right, without further notice, (i) to change the product specifications and/or the information in this document and (ii) to improve reliability, functions and design of this product. Copyright © 2021, by SENSIRION. CMOSens® is a trademark of Sensirion. All rights reserved Headquarters and Subsidiaries Sensirion AG Laubisruetistr. 50 CH-8712 Staefa ZH Switzerland phone: +41 44 306 40 00 fax: +41 44 306 40 30 info@sensirion.com www.sensirion.com Sensirion Inc., USA phone: +1 312 690 5858 info-us@sensirion.com www.sensirion.com Sensirion Korea Co. Ltd. phone: +82 31 337 7700~3 info-kr@sensirion.com www.sensirion.com/kr Sensirion Japan Co. Ltd. phone: +81 3 3444 4940 info-jp@sensirion.com www.sensirion.com/jp Sensirion China Co. Ltd. phone: +86 755 8252 1501 info-cn@sensirion.com www.sensirion.com/cn Sensirion Taiwan Co. Ltd phone: +886 3 5506701 info@sensirion.com www.sensirion.com To find your local representative, please visit www.sensirion.com/distributors