MICS-4514 ETC1 | Alldatasheet

Document overview

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Technical content

Features

  • Smallest footprint for compact designs (5 x 7 x 1.55 mm)
  • Robust MEMS sensor for harsh environments
  • High-volume manufacturing for low-cost

applications

  • Short lead-times Detectable gases
  • Carbon monoxide CO 1 – 1000ppm
  • Nitrogen dioxide NO2 0.05 – 10ppm
  • Ethanol C2H5OH 10 – 500ppm
  • Hydrogen H2 1 – 1000ppm
  • Ammonia NH3 1 – 500ppm
  • Methane CH4 >1000ppm 0.01 0.10 1.00 10.00 100.00 0.01 0.1 1 10 100 Concentration [ppm] Rs/R0 Hydrogen NO NO2 RED sensor, continuous power ON, 25°C, 50% RH OX sensor, continuous power ON, 25°C, 50% RH 0.01 0.10 1.00 10.00 0.1 1 10 100 1000 10000 100000 Concentration [ppm] Rs/R0 COEthanol Hydrogen Methane Propane Iso-butane Ammonia 0.01 0.10 1.00 10.00 0.1 1 10 100 1000 10000 100000 Concentration [ppm] Rs/R0 CO Ethanol Hydrogen Methane Propane Iso-butane Ammonia H2S Page 1 of 5

RED sensor Symbol Typ Min Max Unit Sensing resistance in air (see note 1) R0 - 100 1500 k Typical CO detection range FS 1 1000 ppm Sensitivity factor (see note 2) S60 - 1.2 50 - Performance OX sensor Characteristic OX sensor Symbol Typ Min Max Unit Sensing resistance in air (see note 1) R0 - 0.8 20 k Typical NO2 detection range FS 0.05 10 ppm Sensitivity factor (see note 3) SR - 2 - - MiCS-4514 0278 rev 15 Notes: 1. Sensing resistance in air R0 is measured under controlled ambient conditions, i.e. synthetic air at 23 ±5°C and 50 ± 10% RH for RED sensor and synthetic air at 23 ±5°C and ≤ 5% RH for OX sensor. Sampling test. 2. Sensitivity factor is defined as Rs in air divided by Rs at 60 ppm CO. Test conditions are 23 ± 5°C and 50 ± 10% RH. Indicative values only. Sampling test. 3. Sensitivity factor is defined as Rs at 0.25 ppm NO2, divided by Rs in air. Test conditions are 23 ± 5°C and ≤ 5% RH . Indicative values only. Sampling test. IMPORTANT PRECAUTIONS: Read the following instructions carefully before using the MiCS-4514 described here to avoid erroneous readings and to prevent the device from permanent damage.

  • The sensor must be reflow soldered in a neutral atmosphere, without soldering flux vapours.
  • The sensor must not be exposed to high concentrations of organic solvents, silicone vapours or cigarette-smoke in order to avoid poisoning the sensitive layer.
  • Heater voltage above the specified maximum rating will destroy the sensor due to overheating.
  • This sensor is to be placed in a filtered package that protects it against water and dust projections.
  • SGX sensortech strongly recommends using ESD protection equipment to handle the sensor. Page 2 of 5

Power circuit and measurement circuit Parameter RED sensor/OX sensor Symbol Typ Min Max Unit Heating power PH 76/43 71/30 81/50 mW Heating voltage VH 2.4/1.7 - - V Heating current IH 32/26 - - mA Heating resistance at nominal power RH 74/66 66/59 82/73  Rating Symbol Value / Range Unit Maximum heater power dissipation PH 88 (RED sensor)/50 (OX sensor) mW Maximum sensitive layer power dissipation Ps 8 mW Voltage supplyHeating current Vsupply 4.9 – 5.1 V Relative humidity range RH 5 – 95 %RH Ambient operating temperature Tamb -30 – 85 °C Storage temperature range Tsto -40 – 120 °C Storage humidity range RHsto 5 - 95 %RH MiCS-4514 0278 rev 15 MiCS-4514 with measurement circuit (top view) The two voltages measured on the load resistors are directly linked to the resistances of the RED and OX sensors respectively. RLOAD must be 820  at the lowest in order not to damage the sensitive layer. MiCS-4514 with recommended supply circuit (top view) RDRED is a 82  and RDOX is a 133. These resistors are necessary to obtain the right temperatures on the two independant heaters while using a single 5V power supply. The resulting voltages are typically VHRED = 2.4V and VHOX= 1.7V. Page 3 of 5

Package outline dimensions The package is compatible with SMD assembly process. Operating conditions The heating power is typically 80 mW and 43 mW for the RED and OX sensor respectively. Heating voltage is 2.35 and 1.7 V. Heating current is 34 and 26 mA. Heating resistance at nominal power is 74 and 66 ohm. The resistance under air is 100 – 1500 kohm for the RED sensor and 0.8 – 20 kohm for the OX sensor . MiCS-4514 0278 rev 15 Sensor configuration The silicon gas sensor structure consists of an accurately micro machined diaphragm with an embedded heating resistor and the sensing layer on top. The MiCS-4514 includes two sensor chips with independent heaters and sensitive layers. One sensor chip detects oxidising gases (OX) and the other sensor detects reducing gases (RED). The internal connections are shown above. Pin Connection A Rh1 OX B Rs1 OX C Rh1 RED D Rs1 RED E NC F Rh2 RED G Rs2 RED H Rh2 OX J Rs2 OX K NC MiCS-4514 configuration (bottom view) Page 4 of 5

SGX Sensortech, Courtils 1 CH-2035 Corcelles-Cormondrèche Switzerland www.sgxsensortech.com For more information please contact: info.em@sgxsensortech.com Power circuit The two resistors (82 ohm for RED and 51+82 ohm for OX) are necessary to obtain the right temperatures on the two independent heaters while using a 5V power supply. Packaging The sensors are packaged in a tape and reel for expedition. The sensors are placed in a carrier type. The dimensions of the cavity are 5.5 x 7.5 x 2.55 mm (the tolerance is +/- 0.2 mm). The outside dimension of the reel is either 178 +- mm (for a maximum of 700 sensors ) or 330 + 0.25 / -4 mm (for a maximum of 2000 sensors). MiCS-4514 0278 rev 15 Whilst SGX sensortech has taken care to ensure the accuracy of the information contained herein it accepts no responsibility for the consequences of any use thereof and also reserves the right to change the specification of goods without notice. SGX sensortech accepts no liability beyond the set out in its standard conditions of sale in respect of infringement of third party patents arising from the use of tubes or other devices in accordance with information contained herein. Page 5 of 5