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

Diodes Incorporated AH3761-PG-B

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

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Part No.:: AH3761-PG-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH3761-PG-B.pdf

Description:: MAGNETIC SWITCH LATCH 3SIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,437

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Product details

Overview

AH3761-PG-B from Diodes Incorporated is a high-sensitivity Hall-effect latch sensor designed for electronic commutation in brushless DC motors. It integrates a Hall voltage generator, comparator, Schmitt trigger with hysteresis, and open-drain output, operating from 3V to 28V with B_op = 5–60 Gauss and B_rp = –60 to –5 Gauss. Its chopper-stabilized architecture enables stable switching in motor position sensing applications.

For engineers reviewing the AH3761-PG-B datasheet, AH3761-PG-B pinout, AH3761-PG-B application, or AH3761-PG-B equivalent, key selection criteria include magnetic operate/release thresholds, open-drain drive capability (I_OM = 50–90 mA), thermal derating in SIP-3 bulk package, and NRND status requiring legacy design validation.

Technical Context

The AH3761-PG-B implements dynamic offset cancellation via chopper stabilization to suppress sensor drift and improve temperature stability across –40°C to +125°C. Its internal bandgap regulator enables wide-supply operation while maintaining consistent bias for the Hall element and signal chain.

Switching behavior is defined by magnetic hysteresis (B_hys = 60 Gauss typical), with output latching low when B > B_op and releasing high only upon reversal below B_rp. The open-drain output supports external pull-up configurations up to 30 V, with t_F = 20 ns and t_R = 340 ns into 10 kΩ/16 pF load.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DD Range	3 V to 28 V - Supports direct connection to 12 V/24 V motor control rails without external regulation
B_op / B_rp	5–60 G / –60 to –5 G - Enables reliable detection of small magnetic field reversals in rotor position sensing
I_OM	50–90 mA - Limits peak output current to protect internal driver during short-circuit transients
t_ST	47 µs - Ensures stable output state within 50 µs after power-on, critical for motor startup timing
P_D (SIP-3 Bulk)	550 mW at 25°C, derates to 0 mW at 150°C - Defines maximum continuous dissipation in standard mounting conditions
f_C	300 kHz - Chopping frequency eliminates 1/f noise and enables high-precision DC magnetic measurement

Pinout & Package

The AH3761-PG-B is supplied in SIP-3 (Straight Lead, Bulk Pack) package with gull-wing leads, 14.0–15.0 mm body length, and 2.8–3.2 mm width. Pin 1 = V_DD, Pin 2 = GND, Pin 3 = OUT (open-drain).

Pin/Terminal	Circuit Role	Design Meaning
V_DD (Pin 1)	Positive power supply input	Accepts 3–28 V DC; powers internal bandgap regulator and signal chain
GND (Pin 2)	Ground reference	Common return path for Hall element, amplifier, and output stage
OUT (Pin 3)	Open-drain output	Sinks up to 90 mA; requires external pull-up for logic-level interface or MOSFET gate drive

Key Features

Feature	Design Value
Chopper stabilization	Eliminates offset drift over temperature and time, enabling stable zero-field baseline in motor commutation
Integrated reverse polarity protection	Withstands –30 V reverse battery connection without external diode, reducing BOM count in automotive BLDC modules
Hysteresis (60 G typical)	Prevents output oscillation near magnetic threshold transitions, essential for clean edge generation in RPM detection
Output short-circuit protection	Auto-shutdown for >160 µs overcurrent events, preventing thermal runaway during stalled motor conditions

Applications

Brushless DC Motor Commutation

RPM Detection

Use Scenario: Sensing rotor magnet polarity to sequence phase winding energization in 3-phase BLDC drives.

IC Role / Device Role / Timing Role: Latched Hall sensor providing synchronized digital commutation signals to motor controller MCU.

Use Value: B_op/B_rp asymmetry and 60 G hysteresis ensure robust switching despite air-gap variation and EMI in motor environments.

Use Scenario: Counting magnetic pole transitions on rotating shafts for speed feedback in fans, pumps, and HVAC blowers.

IC Role / Device Role / Timing Role: Digital edge generator converting analog magnetic flux changes into clean TTL-compatible pulses.

Use Value: 340 ns rise time and 20 ns fall time support accurate pulse timing up to ~1 MHz, enabling resolution to 0.1% RPM error.

Consumer Position Sensor

Industrial Flow Meter

Use Scenario: Detecting lid closure, hinge angle, or slider position in appliances and smart home devices.

IC Role / Device Role / Timing Role: Low-power magnetic presence detector with stable threshold across battery voltage range (3–28 V).

Use Value: 4 mA typical supply current and built-in voltage overshoot protection extend system reliability in unregulated consumer power domains.

Use Scenario: Monitoring turbine or paddle rotation in water/gas metering systems exposed to wide ambient temperatures.

IC Role / Device Role / Timing Role: High-temperature-rated (–40°C to +125°C) latch delivering repeatable magnetic switching under vibration and moisture.

Use Value: SIP-3 package thermal resistance (227 °C/W) and green molding compound enable long-term stability in sealed industrial enclosures.

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 manufacturer, identical pinout and function but updated process; higher B_op min (10 G vs. 5 G), lower I_OM (40–70 mA)	Preferred for new designs requiring tighter magnetic sensitivity control and improved ESD robustness	Select AH3774 if designing new BLDC systems; AH3761-PG-B remains valid for legacy repair or cost-sensitive replacement
AL3761Q	Automotive-grade variant (AEC-Q100 qualified); same electrical specs but enhanced thermal cycling and humidity resistance	Required for automotive BLDC applications (e.g., radiator fans, EPS) where qualification compliance is mandatory	Choose AL3761Q for automotive production; AH3761-PG-B is industrial-grade only

Compared with AH3774 and AL3761Q, the AH3761-PG-B offers proven performance in legacy industrial BLDC systems but lacks AEC-Q100 qualification and has looser magnetic thresholds-making it suitable for cost-driven replacements where qualification and precision are not required.

Availability

AH3761-PG-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM detection, and industrial flow metering requiring stable component supply in legacy production environments.

Supply support for AH3761-PG-B 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 ICs, specializing in high-reliability power management, signal integrity, and sensing solutions for industrial and consumer markets.

The AH3761 belongs to Diodes' Hall-effect sensor product line, engineered specifically for robust magnetic position sensing in motor control and motion feedback systems under harsh electrical and thermal conditions.

FAQ

Is AH3761-PG-B RoHS compliant and halogen-free?

Yes. AH3761-PG-B uses a fully lead-free, RoHS-compliant "Green" molding compound containing <900 ppm bromine, <900 ppm chlorine (total Br+Cl <1500 ppm), and <1000 ppm antimony, meeting EU Directive 2011/65/EU and Diodes' internal halogen-free standards.

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

"NRND" (Not Recommended for New Design) indicates Diodes Incorporated no longer promotes AH3761-PG-B for new projects. It remains available for legacy support and repair, but new designs should consider AH3774 or AL3761Q for improved specs and qualification status.

Can AH3761-PG-B drive a MOSFET gate directly?

No. Its open-drain output sinks up to 90 mA but cannot source current. To drive a MOSFET gate, an external pull-up resistor (e.g., 10 kΩ to 12 V) is required to generate a high-side logic signal; for high-speed switching, a dedicated gate driver is recommended.

How does chopper stabilization improve performance in AH3761-PG-B?

Chopper stabilization modulates the Hall element signal at 300 kHz, shifting amplification away from low-frequency 1/f noise. This reduces offset drift to <1 G/°C and enables stable operation over –40°C to +125°C without external calibration-critical for consistent motor commutation timing.

AH3761-PG-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

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-B FAQ

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

Please submit a Request for Quotation (RFQ) for AH3761-PG-B 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-B reliable?

The price and inventory of AH3761-PG-B 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-B is usually 5 days.

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

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

Note: Certain payment methods may incur a processing fee.

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

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

Once your AH3761-PG-B 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-B?

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

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

All AH3761-PG-B 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-B meets industry standards.

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

All AH3761-PG-B units undergo pre-shipment inspection (PSI). If there is an issue with AH3761-PG-B, 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-B part is unused and in its original packaging.

Return procedure for AH3761-PG-B:

1.Submit a request within 90 days.

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

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