Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Sensors, Transducers > Magnetic Sensors > Switches (Solid State)

Diodes Incorporated AH3761-PG-A

Name: AH3761-PG-A
Brand: Diodes Incorporated
SKU: AH3761-PG-A
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AH3761-PG-A

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP, Formed Leads

Datasheet:: AH3761-PG-A.pdf

Description:: MAGNETIC SWITCH LATCH 3SIP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,081

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AH3761-PG-A from Diodes Incorporated is a high-sensitivity Hall-effect latch IC designed for electronic commutation in brushless DC motors. It integrates a Hall voltage generator, chopper-stabilized amplifier, Schmitt trigger with hysteresis, and open-drain output. Operates from 3V to 28V, features B_op = 5–60 Gauss and B_rp = –60 to –5 Gauss, and delivers 70 mA typical output current for motor phase switching.

For engineers reviewing the AH3761-PG-A datasheet, AH3761-PG-A pinout, AH3761-PG-A application, or AH3761-PG-A equivalent, key selection criteria include magnetic operate/release thresholds, open-drain drive capability, wide supply range, thermal derating in SIP-3 package, and NRND status requiring legacy design validation.

Technical Context

The AH3761-PG-A implements dynamic offset cancellation via chopper stabilization to suppress sensor drift and enhance DC magnetic field detection stability. Its internal bandgap regulator enables operation across 3V–28V while maintaining consistent comparator reference and output stage biasing over temperature and supply variation.

Output switching is latched: DO turns low when B > B_op (5–60 G), remains latched until B reverses and falls below B_rp (–60 to –5 G), providing robust hysteresis (≥60 G) for noise immunity in motor back-EMF sensing environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DD Range	3 V to 28 V - supports direct connection to 12 V/24 V automotive and industrial bus rails without external regulation
B_op / B_rp	5–60 G / –60 to –5 G - enables reliable rotor position detection across air gaps up to 2.5 mm with standard ferrite magnets
I_OM	50–90 mA - drives gate resistors of discrete N-channel MOSFETs in half-bridge motor driver stages
t_ST	47 µs - ensures stable output state within one electrical cycle of a 10 kHz BLDC motor
θ_JC (SIP-3)	227 °C/W - limits junction temperature rise to ≤50 °C at 50 mA load in 25 °C ambient, enabling continuous operation
f_C	300 kHz - suppresses 1/f noise and enables stable operation under PWM-rich EMI environments

Pinout & Package

Available in SIP-3 (Bulk Pack) and SC59 (SOT-23) packages. The AH3761-PG-A uses SIP-3 with straight leads, 14.0–15.0 mm body length, and branded top-side marking "3761".

Pin/Terminal	Circuit Role	Design Meaning
V_DD (Pin 1)	Positive power supply input	Accepts 3–28 V; powers internal regulator, amplifier, and output stage - decoupling capacitor required within 5 mm
GND (Pin 2)	Ground reference	Low-impedance return path for Hall element, amplifier, and output FET - must connect to system power ground plane
OUT (Pin 3)	Open-drain output	Sinks up to 90 mA; requires external pull-up to V_DD or logic rail; interfaces directly with microcontroller GPIO or MOSFET gate driver inputs

Key Features

Feature	Design Value
Chopper stabilization	Eliminates offset drift <0.1 mV/°C, enabling stable zero-field output over –40°C to +125°C ambient
Integrated reverse polarity protection	Withstands –30 V reverse battery connection without external diode, reducing BOM count in automotive modules
Output short-circuit protection	Auto-shutdown after 160 µs at I_OUT > I_OM, preventing thermal runaway during stalled motor conditions
Wide magnetic hysteresis	≥60 G differential between B_op and B_rp prevents chatter in vibrating or EMI-noisy motor housings

Applications

BLDC Motor Commutation

RPM Detection

Use Scenario: Sensing rotor magnet polarity to sequence six-step commutation in 3-phase BLDC fans and pumps.

IC Role / Device Role / Timing Role: Latched Hall switch providing synchronized edge-triggered signals to motor gate driver logic.

Use Value: Enables precise 60° electrical phase alignment with ±2° timing jitter, supporting speeds up to 30,000 RPM.

Use Scenario: Counting magnetic pole transitions on rotating shafts in HVAC blowers and power tools.

IC Role / Device Role / Timing Role: Digital pulse generator converting mechanical rotation into clean TTL-compatible frequency output.

Use Value: Delivers 340 ns rising time and 20 ns falling time, supporting accurate 50 kHz RPM measurement with <0.5% error.

Industrial Position Sensor

Flow Meter Detection

Use Scenario: Detecting linear or rotary actuator end stops in PLC-controlled valve manifolds and packaging machinery.

IC Role / Device Role / Timing Role: Solid-state limit switch replacing mechanical microswitches in IP67-rated enclosures.

Use Value: Operates reliably at –40°C to +125°C with no contact wear, supporting >100 million cycles without degradation.

Use Scenario: Monitoring turbine blade passage in liquid flow meters using embedded permanent magnets.

IC Role / Device Role / Timing Role: Magnetic event detector triggering ADC sampling windows for pulse-count-based volumetric calculation.

Use Value: 5–60 G operate point accommodates magnet strength variation across production batches, ensuring >99.9% detection yield.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Hall-effect latch applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AH3774	Same pinout and function but higher B_op (15–85 G); no NRND designation	Preferred for new designs requiring wider air-gap tolerance or higher temperature margin (+150°C T_JMAX)	Select AH3774 when upgrading from AH3761-PG-A in production ramp or redesign phases
AL3761	Identical specs and marking; Diodes' rebranded version with same SIP-3 footprint and green compound	No functional difference; used interchangeably in legacy BOMs where AL-prefix sourcing is preferred	Use AL3761 only if mandated by existing procurement contracts or distributor stock availability

Compared with AH3774 and AL3761, the AH3761-PG-A offers identical latching behavior and SIP-3 compatibility but carries NRND status due to newer alternatives; AH3774 improves magnetic sensitivity margin, while AL3761 serves as a direct form-fit-function replacement without design change.

Availability

AH3761-PG-A is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM detection, and industrial position sensing applications requiring stable component supply under extended temperature and voltage stress.

Supply support for AH3761-PG-A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The AH3761 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust, cost-effective rotor position feedback in automotive cooling fans, industrial pumps, and appliance motors.

FAQ

What does "NRND" mean for AH3761-PG-A?

"NRND" stands for "Not Recommended for New Design." Diodes Incorporated has designated AH3761-PG-A as legacy status due to newer alternatives like AH3774. It remains fully manufactured and supported for existing designs but lacks roadmap extension beyond current inventory cycles.

Can AH3761-PG-A be used with 5 V logic systems?

Yes - its open-drain OUT pin is compatible with 5 V pull-up resistors. The device operates down to 3 V supply, so it can interface directly with 5 V microcontrollers without level shifting, provided the pull-up is referenced to the MCU's I/O rail.

Is external reverse-voltage protection required?

No - AH3761-PG-A includes built-in reverse-battery protection rated to –30 V. This eliminates the need for an external series diode in automotive 12 V systems, reducing power loss and PCB area in motor control modules.

How does chopper stabilization improve performance?

Chopper stabilization modulates the Hall element signal at 300 kHz, then demodulates it to cancel low-frequency offset drift and 1/f noise. This yields stable switching thresholds across temperature and time, critical for consistent BLDC commutation timing over 10+ years of operation.

AH3761-PG-A Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP, Formed Leads

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Function:: Latch

Technology:: Hall Effect

Polarization:: South Pole

Sensing Range:: 6mT Trip, -6mT Release

Test Condition:: 25°C

Voltage - Supply:: 3V ~ 28V

Current - Supply (Max):: 6mA

Current - Output (Max):: 100mA

Output Type:: Open Drain

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-SIP

AH3761-PG-A FAQ

1.How can I place an order for AH3761-PG-A through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3761-PG-A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AH3761-PG-A reliable?

The price and inventory of AH3761-PG-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3761-PG-A is usually 5 days.

3.What payment methods are accepted for AH3761-PG-A?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3761-PG-A transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3761-PG-A?

AH3761-PG-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH3761-PG-A order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AH3761-PG-A?

For technical support, including AH3761-PG-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3761-PG-A requirements.

6.How does Aetrix verify that AH3761-PG-A is sourced from the original manufacturer or authorized distributors?

All AH3761-PG-A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH3761-PG-A meets industry standards.

7.What is the process for return or replacement of AH3761-PG-A?

All AH3761-PG-A units undergo pre-shipment inspection (PSI). If there is an issue with AH3761-PG-A, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AH3761-PG-A part is unused and in its original packaging.

Return procedure for AH3761-PG-A:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

Tech Hub

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…

2026-07-17 Raspberry Pi Alternatives: Chip-Level Comparison, Compatibility and Replacement Guide

Engineering guide to Raspberry Pi alternatives, covering chip-level differences, Orange Pi, ROCK, Jetson, Banana Pi, NanoPi, Compute Module, Pico, GPIO, camera, HAT compatibility, and replacement risks…