Unipolar Hall Sensor AH3131

Unipolar Hall Sensor AH3131
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Unipolar Hall Sensor AH3131

Product catalog summary
Features and Benefits
  • High sensitivity digital output with stable performance across a wide temperature range (-40ºC to 150ºC).
  • Wide operating voltage range from 4.5V to 24V.
  • Strong resistance to mechanical stress and reverse power supply protection.
  • Non-contact output ensuring safety and reliability.
  • Available in TO-92UA, SOT-23-3L, and SOT-89 package options, compliant with EU RoHS and REACH standards.
Application Examples
  • Automotive, consumer, and industrial electronics.
  • Water flow sensing, electronic steering column lock, door latch system, seat adjustment, speed measurement, tachometer, motor control, and brushless DC motor applications.
Selection Guide
  • AH3131/K-M: SOT23-3L surface mount, -40ºC to 125ºC, 3000 pieces per reel.
  • AH3131/L-S: SOT89 surface mount, -40ºC to 150ºC, 1000 pieces per reel.
  • AH3131/L-UA: SIP through hole, -40ºC to 150ºC, 500 pieces per bag.
General Description

The AH3131 is a high sensitivity digital unipolar Hall IC with a single output. It includes a reverse voltage protector, voltage regulator, temperature compensation circuit, Hall-voltage generator, signal amplifier, Schmitt trigger, and open-collector output driver on a single silicon chip. It is produced with bipolar technology for enhanced stability and reliability.

Electrical Operating Characteristics
  • Supply Voltage: 4.5V to 24V.
  • High-level Output Voltage: 24V max.
  • Low-level Output Voltage: 0.5V max.
  • Power-On Time: 30μs max.
  • Output leakage Current: 10μA max.
Magnetic Operating Characteristics
  • Operating Point (BOP): 1.0mT min, 3.0mT max.
  • Release Point (BRP): 1.0mT min, 1.5mT max.
  • Hysteresis (BH): 0.5mT min.
Magnetic Behavior

The sensor outputs a low level when the S pole of the magnet faces the mark surface and is close (B≥BOP), and a high level when the S pole is away (B≤BRP). The sensor does not respond to the N pole facing its mark surface. The stable hysteresis ensures reliable switching.

Package Information
  • SOT-23-3L, SOT-89, and TO-92UA package dimensions are provided with detailed measurements.
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Catalog excerpts

Unipolar Hall Sensor AH3131-1

High Sensitivity Digital Unipolar Hall IC △ High sensitivity digital output △ Automotive electronics, Consumer electronics and Industrial electronics △ Water flow sensing △ Electronic steering column lock △ Door latch system △ Seat adjustment △ Speed measurement and tachometer △ Motor control △ Brushless DC motor △ Stable over the entire temperature range △ Wide operating voltage range: 4.5V ~ 24V △ Strong resistance to mechanical stress △ Reverse power supply protection △ Non-contact output, safety and reliable △ TO-92UA, SOT-23-3L and SOT-89 package options △ Developed according to the EU RoHS and REACH 3 Selection Guide Packing Part Number NOTE 1. Hall ICs are soldered tin brazing for assembly, and wave soldering of SOT-23-3L and SOT-89 surface-mounted components poses a risk of failure. 2. A risk of circuit failure may happen in non-brazing processes such as electric resistance welding, high-frequency welding, etc. 3. E: -40~85°C; K: -40~125°C; L: -40~150°C. Nanjing AH Electronic Science & Technology Co., Ltd. ADD: Building 3, Huaye Park, Qidi City, 8, Zhineng Road, KyLi

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Unipolar Hall Sensor AH3131-2

High Sensitivity Digital Unipolar Hall IC 4 General Description The AH3131 is a high sensitivity digital unipolar Hall IC with single output. The AH3131 Hall-effect sensor includes the following on a single silicon chip: reverse voltage protector, voltage regulator, temperature compensation circuit, Hall-voltage generator, signal amplifier, Schmitt trigger and opencollector output driver, etc. The integrated voltage regulator and temperature compensation circuit ensure that the sensor works stably in a wide voltage and temperature range. The reverse voltage protection circuit prevents the sensor...

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Unipolar Hall Sensor AH3131-3

High Sensitivity Digital Unipolar Hall IC 6 Absolute Maximum Ratings Characteristic Supply Voltage Reverse Supply Voltage Reverse Output Voltage Output Current Magnetic Flux Density Operating Temperature Operating Juntion Temperature Too high a Tj could lead to electrical or thermal breakdown Maximum Junction Temperature Storage Temperature NOTE 1. Human Body Model according to AEC-Q100-002 standard. 7 Electrical Operating Characteristics valid through the full operating temperature range; unless otherwise specified Test Conditions Supply Voltage High-level Output Voltage Low-level Output Voltage...

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Unipolar Hall Sensor AH3131-4

High Sensitivity Digital Unipolar Hall IC 9 Characteristic Curves (Type UA) Supply Current (Off) versus Ambient Temperature VCC (V) Supply Current (Off) versus Supply Voltage T A (°C) Low-level Output (On) versus Ambient Temperature VCC (V) Low-level Output (On) versus Supply Voltage T A (°C) Operating and Release Point versus Ambient Temperature BOP Nanjing AH Electronic Science & Technology Co., Ltd. ADD: Building 3, Huaye Park, Qidi City, 8, Zhineng Road, KyLin Technology Innovation Park, Nanj

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Unipolar Hall Sensor AH3131-5

High Sensitivity Digital Unipolar Hall IC 10 Magnetic Behavior South Pole Active When the S pole of the magnet faces the mark surface of the sensor and is close to it (B≥BOP), the sensor outputs a low level; when the S pole is away from the sensor (B≤BRP), it outputs a high level. The sensor does not respond when the N pole faces its mark surface. The stable hysteresis (BH = | BOP - BRP |) ensures that the sensor switch is stable. The magnetoelectric conversion characteristics of AH3131 are shown in the figure: Vout switch to high Switch Type South Pole Active Nanjing AH Electronic Science &...

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Unipolar Hall Sensor AH3131-6

High Sensitivity Digital Unipolar Hall IC North Pole Active When the N pole of the magnet faces the mark surface of the sensor and is close to it (B≥BOP), the sensor outputs a low level; when the N pole is away from the sensor (B≤BRP), it outputs a high level. The sensor does not respond when the S pole faces its mark surface. The stable hysteresis (BH = | BOP - BRP |) ensures that the sensor switch is stable. The magnetoelectric conversion characteristics of AH3131 are shown in the figure: Vout switch to high Switch Type North Pole Active Nanjing AH Electronic Science & Technology Co., Ltd....

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Unipolar Hall Sensor AH3131-7

High Sensitivity Digital Unipolar Hall IC Nanjing AH Electronic Science & Technology Co., Ltd. ADD: Building 3, Huaye Park, Qidi City, 8, Zhineng Road, KyLin Technology Innovation Park, Nanjing, Chin

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Unipolar Hall Sensor AH3131-8

High Sensitivity Digital Unipolar Hall IC Nanjing AH Electronic Science & Technology Co., Ltd. ADD: Building 3, Huaye Park, Qidi City, 8, Zhineng Road, KyLin Technology Innovation Park, Nanjing, China

 Open the catalog to page 8
Unipolar Hall Sensor AH3131-9

High Sensitivity Digital Unipolar Hall IC Nanjing AH Electronic Science & Technology Co., Ltd. ADD: Building 3, Huaye Park, Qidi City, 8, Zhineng Road, KyLin Technology Innovation Park, Nanjing, China

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Unipolar Hall Sensor AH3131-10

High Sensitivity Digital Unipolar Hall IC Package form Operating temperature Device part number 3-pin digital unipolar series with single output Nanjing AH Electronic Science & Technology Co., Ltd. ● Package Form: M —— SOT-23-3L(SMD) S —— SOT-89(SMD) UA —— TO-92UA/TO-92S(SIP) Note: M and S type are packed in reels, M 3k/reel, S 1k/reel; UA type is packed in bags of 1k/bag or 0.5k/bag. ● Operating Temperature: E —— -40℃~+85℃ L —— -40℃~+150℃ Copyright 2003~2020 Nanjing AH Electronic Science & Technology Co., Ltd. Nanjing AH Electronic Science & Technology Co., reserves the right to improve the...

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