A3280LLHLT-T

3280_03 ALLEGRO

Document overview

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Technical content

The A3280--, A3281--, and A3283-- Hall-effect latches are ex treme ly temperature-stable and stress-resistant sensors especially suited for op- eration over extended temperature ranges to +150°C. Superior high-tem- perature per for mance is made possible through dynamic offset cancella- tion, which reduces the residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress. The three devices are iden ti cal except for mag net ic switch points. Each device includes on a single silicon chip a voltage regulator, Hall-voltage generator, small-signal amplifier, chopper sta bi li za tion, Schmitt trigger, and a short-circuit protected open-collector output to sink up to 25 mA. A south pole of sufficient strength will turn the output on. A north pole is necessary to turn the output off. An on-board regula- tor permits operation with supply voltages of 4.2 to 24 volts. Three package styles provide a magnetically op ti mized pack age for most ap pli ca tions. Package type LH is a modified SOT23W surface- mount package, LT is a miniature SOT89/TO-243AA transistor package for surface-mount applications; while UA is a three-lead ultra-mini-SIP for through-hole mounting. Each package type is also available in a lead (Pb) free version (suffix, –T) , with a 100% matte tin plated leadframe. Data Sheet 27609.20e

FEATURES

■ Symmetrical Switch Points ■ Resistant to Physical Stress ■ Superior Temperature Stability ■ Output Short-Circuit Protection ■ Operation From Unregulated Supply ■ Reverse Battery Protection ■ Sol id-State Reliability ■ Small Size 3280, 3281, AND 3283 ABSOLUTE MAXIMUM RATINGS at TA = +25°C Continuous Output Current, Package Power Dissipation, PD See Graph Operating Temperature Range, TA Storage Temperature Range, T *Internal current limiting is intended to protect the device from output short circuits. Pinning is shown viewed from branded side. CHOPPER-STABILIZED, PRECISION HALL-EF FECT LATCHES Suffix '–LT' & '–UA' Pinning (SOT89/TO-243AA & ultra-mini SIP) Dwg. PH-003-2 1SUPPLY VCC GROUND OUTPUT X PTCT

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 2 Product Selection Guide Part Number Pb-free 1 Packing2 Mounting Ambient, TA (°C) BRP(MIN) (TA = 25°C) (G) BOP(MAX) (TA = 25°C) (G) A3280ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 85 –40 40 A3280ELT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3280ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3280EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3280LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 150A3280LLT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3280LLTTR-T Yes 7-in. reel, 1000 pieces/reel A3280LUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3281ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 85 –90 90 A3281ELT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3281ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3281EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3281LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 150A3281LLT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3281LLTTR-T Yes 7-in. reel, 1000 pieces/reel A3281LUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3283ELHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 85 –180 180 A3283ELT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3283ELTTR-T Yes 7-in. reel, 1000 pieces/reel A3283EUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole A3283LLHLT-T Yes 7-in. reel, 3000 pieces/reel SOT23W Surface Mount –40 to 150A3283LLT-T Yes Bulk, 500 pieces/bag SOT89 Surface MountA3283LLTTR-T Yes 7-in. reel, 1000 pieces/reel A3283LUA-T Yes Bulk, 500 pieces/bag 4-pin SIP through hole 1Pb-based variants are being phased out of the product line. a. Certain variants cited in this footnote are in production but have been determined to be LAST TIME BUY. This classification indicates that sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: October 31, 2006. Deadline for receipt of LAST TIME BUY ORDERS: April 27, 2007. These variants include: A3281ELTTR, A3283ELT, A3283ELTTR, and A3283EUA. b. Certain variants cited in this footnote are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is currently restricted to existing customer applications. The variants should not be purchased for new design applications because obsolescence in the near future is probable. Samples are no longer available. Status change: May 1, 2006. These variants include: A3280ELHLT, A3280ELT, A3280ELTTR, A3280EUA, A3280LLHLT, A3280LLT, A3280LLTTR, A3280LUA, A3281ELHLT, A3281ELT, A3281EUA, A3281LLHLT, A3281LLT, A3281LLTTR, A3281LUA, A3283ELHLT, A3283LLHLT, A3283LLT, A3283LLTTR, and A3283LUA 2Contact Allegro for additional packing options.

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-50003 FUNCTIONAL BLOCK DIAGRAM Copyright © 2000, 2003, 2004 Allegro MicroSystems, Inc. Suffix ‘–LH’ Pinning (SOT23W) Dwg. PH-003-4 SUPPLY GROUND OUTPUT V CC X PTCT 600 400 200 20 60 100 140 AMBIENT TEMPERATURE in °°°°C ALLOWABLE PACKAGE POWER DISSIPATION in MILLIWATTS Dwg. GH-046-2D Suffix "–UA" R θJA = 165°C/W 40 80 120 180 700 500 300 100 160 Suffix "–LT" R θJA = 180°C/W 800 Suffix "E–" Suffix "L–" Suffix "–LH" R θJA = 228°C/W Dwg. FH-020-1 GROUND OUTPUT <1Ω X DYNAMIC OFFSET CANCELLATION SUPPLY CONTROL CURRENT LIMIT REG. SAMPLE & HOLD LOW-PASS FILTER TO ALL SUBCIRCUITS

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 4 Part Numbers1 A3280 A3281 A3283 Operate Point, BOP at TA = +25°C and TA = max. 5.0 22 40 15 50 90 100 150 180 G at TA = -40°C 5.0 – 40 15 – 90 100 – 200 G Release Point, BRP at TA = +25°C and TA = max. -40 -23 -5.0 -90 -50 -15 -180 -150 -100 G Hysteresis, Bhys at TA = +25°C and TA = max. 10 45 80 30 100 180 – 300 360 G (BOP - BRP ) at TA = -40°C – – 80 – – 180 – – 360 G NOTES:1. Complete part number includes a suffix to identify operating temperature range (E or L) and package type (LH, LT, or UA). 2. As used here, negative flux densities are defined as less than zero (algebraic convention) and -50 G is less than +10 G. 3. Typical Data is at T A = +25°C and VCC = 12 V and is for design information only. 4. 1 gauss (G) is exactly equal to 0.1 millitesla (mT). Limits Characteristic Symbol Test Conditions Min. Typ. Max. Units Supply Voltage Range V CC Operating, TJ < 165°C1 4.2–24V Output Leakage Current I OFF VOUT = 24 V, B < BRP –– 1 0 µA Output Saturation Voltage V OUT(SAT) IOUT = 20 mA, B > BOP – 185 500 mV Output Current Limit I OM B > BOP 30 – 60 mA Power-On Time t po VCC > 4.2 V – – 50 µs Chopping Frequency f C – 340 – kHz Output Rise Time t r RL = 820 Ω , CL = 20 pF – 0.2 2.0 µs Output Fall Time t f RL = 820 Ω , CL = 20 pF – 0.1 2.0 µs Supply Current I CC B < BRP, VCC = 12 V – 3.0 8.0 mA B > BOP, VCC = 12 V – 4.0 8.0 mA Reverse Battery Current I CC VRCC = -30 V – – -5.0 mA Zener Voltage V Z + VD ICC = 15 mA, TA = 25°C 2 83 23 7 V Zener Impedance z z + zD ICC = 15 mA, TA = 25°C– 5 0 – Ω NOTES:1. Maximum voltage must be adjusted for power dissipation and junction temperature. 2. BOP = operate point (output turns on); BRP = release point (output turns off). 3. Typical Data is at TA = +25°C and VCC = 12 V and is for design information only. ELECTRICAL CHARACTERISTICS over operating temperature range. MAGNETIC CHARACTERISTICS over operating voltage range.

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Worcester, Massachusetts 01615-0036 (508) 853-50005 TYPICAL OPERATING CHARACTERISTICS as a function of temperature 0 50 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-026-3 SWITCH POINTS IN GAUSS OPERATE POINT 150-25 25 75 125 -50 -40 -30 -20 -10 VCC = 4.5 V VCC = 24 V RELEASE POINT 0 50 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-026-4 SWITCH POINTS IN GAUSS OPERATE POINT 150-25 25 75 125 100 -100 -80 -60 -40 -20 VCC = 4.5 V to 24 V RELEASE POINT * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA). A3283* SWITCH POINTS A3280* SWITCH POINTS A3281* SWITCH POINTS 0 50 100 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-026-6 SWITCH POINTS IN GAUSS OPERATE POINT 150-25 25 75 125 120 160 200 -200 -160 -120 -80 -40 VCC = 4.5 V VCC = 24 V RELEASE POINT

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 6 * Complete part number includes a suffix denoting operating temperature range (E or L) and package type (LH, LT, or UA). 4.0 4.5 5.0 SUPPLY VOLTAGE IN VOLTS 3.0 Dw g. GH-021-1 3.5 RELEASE POINT SWITCH POINT IN GAUSS -40 -80 OPERATE POINT TA = 150°C TA = -40°C 4.0 4.5 5.0 SUPPLY VOLTAGE IN VOLTS 3.0 Dw g. GH-021-3 3.5 RELEASE POINT SWITCH POINT IN GAUSS -20 -40 OPERATE POINT TA = 150°C TA = -40°C TYPICAL OPERATING CHARACTERISTICS as a function of temperature (cont'd) 0 25 50 75 100 300 AMBIENT TEMPERATURE IN °°°°C 200 100 -50 Dwg. GH-029-4 SATURATION VOLTAGE IN mV 150-25 125 IOUT = 20 mA VCC = 12 V 6.0 SUPPLY CURRENT IN mA 5.0 4.0 3.0 2.0 0 2 55 07 51 0 0 AMBIENT TEMPERATURE IN °°°°C -50 Dwg. GH-028-5 125-25 150 OUTPUT ON, B > BOP OUTPUT OFF, B < BRP VCC = 12 V SUPPLY CURRENTOUTPUT SATURATION VOLTAGE A3280* SWITCH POINTS A3281* SWITCH POINTS TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Worcester, Massachusetts 01615-0036 (508) 853-50007 SENSOR LOCATIONS Package Designator ‘LH’ Package Designator ‘UA’ 0.038" 0.96 mm 1 2 Dw g. MH-025 0.011" 0.28 mm NOM ACTIVE AREA DEPTH 0.059" 1.49 mm A Package Designator ‘LT’ Although sensor location is accurate to three sigma for a particular design, product improvements may result in small changes to sensor location. TYPICAL OPERATING CHARACTERISTICS as a function of supply voltage (cont’d) 4.0 4.5 5.0 SUPPLY VOLTAGE IN VOLTS 3.0 Dw g. GH-055-1 3.5 24 TA = 150°C TA = +25°C TA = -40°C IOUT = 20 mA 250 150 SATURATION VOLTAGE IN mV 200 225 175 4.0 6.0 9.0 SUPPLY VOLTAGE IN VOLTS 3.0 Dw g. GH-058-4 5.0 12 TA = 150°C TA = +25°C TA = -40°C 7.0 5.0 3.0 1.0 SUPPLY CURRENT IN mA 6.0 4.0 2.0 8.0 OUTPUT ON 10 118.07.0 SUPPLY CURRENT OUTPUT SATURATION VOLTAGE 0.045" 1.14 mm 1 32 Dw g. MH-008-8A 0.0305" 0.775 mm NOM ACTIVE AREA DEPTH 0.088" 2.24 mm A 1 32 Dwg. MH-011-9B 0.0195" 0.50 mm NOM BRANDED SURFACE ACTIVE AREA DEPTH 0.080" 2.04 mm 0.056" 1.44 mm A Allegro

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 8 FUNCTIONAL DESCRIPTION Chopper-Stabilized Technique. The Hall element can be considered as a resistor array similar to a Wheatstone bridge. A large portion of the offset is a result of the mismatching of these resistors. These devices use a proprietary dynamic offset cancellation technique, with an internal high-frequency clock to reduce the residual offset voltage of the Hall element that is normally caused by device overmolding, temperature dependen- cies, and thermal stress. The chopper-stabilizing technique cancels the mismatching of the resistor circuit by changing the direction of the current flowing through the Hall plate using CMOS switches and Hall voltage measurement taps, while maintaing the Hall-voltage signal that is induced by the external magnetic flux. The signal is then captured by a sample-and- hold circuit and further processed using low-offset bipolar circuitry. This technique produces devices that have an extremely stable quiescent Hall output voltage, are immune to thermal stress, and have precise recoverability after temperature cycling. This technique will also slightly degrade the device output repeatability. A relatively high sampling frequency is used in order that faster signals can be processed. More detailed descriptions of the circuit operation can be found in: Technical Paper STP 97-10, Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancellation and Technical Paper STP 99-1, Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator. Operation. The output of these devices switches low (turns on) when a magnetic field perpendicular to the Hall sensor exceeds the operate point threshold (B OP ). After turn-on, the output is capable of sinking 25 mA and the output voltage is V OUT(SAT) . Note that the device latches; that is, a south pole of sufficient strength towards the branded surface of the device will turn the device on; removal of the south pole will leave the device on. When the magnetic field is reduced below the release point (B RP ), the device output goes high (turns off). The difference in the magnetic operate and release points is the hysteresis (B hys) of the device. This built-in hysteresis allows clean switching of the output even in the presence of external mechanical vibration and electrical noise. Powering up in the absence of a magnetic field (less than B OP and higher than BRP ) will allow an indeterminate output state. The correct state is warranted after the first excursion beyond B OP or BRP . Dwg. EH-012 REG SAMPLE & HOLD X HALL VOLTAGE B Dwg. AH-011-2 0 +B OUTPUT VOLTAGE FLUX DENSITY Dwg. GH-034-5 RPB VOUT(SAT) CCV OPB

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Worcester, Massachusetts 01615-0036 (508) 853-50009 It is strongly recommended that an external bypass capacitor be connected (in close proximity to the Hall sensor) between the supply and ground of the device to reduce both external noise and noise generated by the chopper-stabilization technique. The simplest form of magnet that will operate these devices is a ring magnet. Other methods of operation, such as linear magnets, are possible. Extensive applications information for Hall-effect sensors is available in:

• Hall-Effect IC Applications Guide, Application Note 27701;
• Hall-Effect Devices: Soldering, Gluing, Potting, Encapsulating, and Lead Forming, Application Note 27703.1;
• Soldering of Through-Hole Hall-Sensor Dervices, Application Note 27703; and
• Soldering of Surface-Mount Hall-Sensor Devices, Application Note 27703.2. More detailed descriptions of the chopper-stabilized circuit operation can be found in:
• Monolithic Magnetic Hall Sensor Using Dynamic Quadrature Offset Cancelation, Technical Paper STP 97-10; and
• Chopper-Stabilized Amplifiers With A Track-and-Hold Signal Demodulator, Technical Paper STP 99-1. All are provided at www.allegromicro.com SUPPLY OUTPUT Dwg. EH-013 0.1 µF SUPPLY VCC X PTCT APPLICATIONS INFORMATION The products described herein are manufactured under one or more of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support appliances, devices, or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsi- bility for its use; nor for any infringements of patents or other rights of third parties that may result from its use.

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 10 PACKAGE DESIGNATOR ‘LH’ (SOT23W, fits SC-59A solder-pad layout) NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Where no tolerance is specified, dimension is nominal. 5. Add "LT" to part number for tape and reel. Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) Dwg. MA-011-3 in 0.039 0.094 0.037 0.028 Dwg. MA-011-3 mm 1.00 2.40 0.95 0.70 Dwg. MA-010-3D in 0.006 0.000 0.0079 0.0050 0.083 0.073 0.118 0.106 0.037 BSC 0.022 REF 0.020 0.012 0.045 0.032 0° TO 8° 0.010 MIN GAUGE PLANE SEATING PLANE 0.010 BSC 0.122 0.114 Dwg. MA-010-3D mm 0.15 0.00 0.20 0.127 2.10 1.85 3.00 2.70 0.95 BSC 0.55 REF 0.50 0.30 1.13 0.87 0° TO 8° 0.25 MIN GAUGE PLANE SEATING PLANE 0.25 BSC 3.10 2.90

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES Worcester, Massachusetts 01615-0036 (508) 853-500011 Dwg. MA-009-3A in 1 23 0.072 0.064 0.167 0.155 0.059 BSC 0.0189 0.01420.047 0.035 0.102 0.090 0.063 0.055 0.0173 0.0138 0.090 0.084 0.0221 0.0173 0.118 BSC 0.181 0.173 Dwg. MA-009-3A mm 1 23 4.60 4.40 1.83 1.62 4.25 3.94 1.50 BSC 0.48 0.361.20 0.89 2.60 2.29 1.60 1.40 0.44 0.35 2.29 2.13 0.56 0.44 3.00 BSC PACKAGE DESIGNATOR ‘LT’ (SOT89/TO-243AA) Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Supplied in bulk pack (500 pieces per bag) or add "TR" to part number for tape and reel. 3. Only low-temperature (≤240°C) reflow-soldering techniques are recommended for SOT89 devices. B 0.098 0.031 0.102 0.047 0.181 0.079 Dwg. MA-012-3 in Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.028 TYP 0.031 TYP A 3 13 B 2.5 0.8 2.6 1.2 4.6 2.0 Dwg. MA-012-3 mm Pads 1, 2, 3, and A — Standard SOT89 Layout Pads 1, 2, 3, and B — Low-Stress Version Pads 1, 2, and 3 only — Lowest Stress, But Not Self Aligning 0.7 TYP 0.8 TYP A

3280, 3281, AND 3283 CHOPPER-STABILIZED, PRECISION HALL-EFFECT LATCHES www.allegromicro.com 12 Dimensions in Inches (controlling dimensions) Dimensions in Millimeters (for reference only) PACKAGE DESIGNATOR ‘UA’ NOTES: 1. Tolerances on package height and width represent allowable mold offsets. Dimensions given are measured at the widest point (parting line). 2. Exact body and lead configuration at vendor’s option within limits shown. 3. Height does not include mold gate flash. 4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm). 5. Where no tolerance is specified, dimension is nominal. 6. Supplied in bulk pack (500 pieces per bag). Dwg. MH-014E in 0.164 0.159 0.062 0.058 0.0173 0.0138 0.050 BSC 45° 0.640 0.600 0.0189 0.0142 0.085 MAX 45° 0.031123 0.122 0.117 SEE NOTE Dwg. MH-014E mm 4.17 4.04 1.57 1.47 0.44 0.35 1.27 BSC 45° 16.26 15.24 0.48 0.36 2.16 MAX 45° 0.79123 3.10 2.97 SEE NOTE