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

Diodes Incorporated AH3772-W-7

Name: AH3772-W-7
Brand: Diodes Incorporated
SKU: AH3772-W-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH3772-W-7

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: AH3772-W-7.pdf

Description:: MAGNETIC SWITCH LATCH SC59-3

Quantity:: RFQ Add To RFQ list

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Inventory:2,934

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Product details

Overview

AH3772-W-7 from Diodes Incorporated is a high-voltage, high-sensitivity bipolar Hall effect latch IC designed for brushless DC motor commutation and position sensing in industrial and consumer appliances. It operates from 3.0V to 28V, features ±25G typical operate/release points (BOP/BRP), single open-drain output with 30–55mA current limit, and supports –40°C to +125°C operation in SC59 package.

For engineers reviewing the AH3772-W-7 datasheet, AH3772-W-7 pinout, AH3772-W-7 application, or AH3772-W-7 equivalent, key selection criteria include magnetic sensitivity stability over temperature, reverse-battery protection capability, chopper-stabilized offset cancellation, and compatibility with 3.3V/5V/12V/24V supply rails in motor control and RPM sensing circuits.

Technical Context

The AH3772 employs chopper-stabilized architecture with dynamic offset cancellation to minimize switch-point drift across temperature and supply voltage. Its internal bandgap regulator provides temperature-compensated biasing for analog blocks, enabling stable BOP/BRP performance from –40°C to +125°C.

It integrates reverse-blocking diode and zener clamp on VDD, plus output overcurrent limiting and zener clamping. The latch behavior-South pole activation (B > +25G) and North pole deactivation (B < –25G)-is implemented via sample-and-hold, low-pass filtering, and power-switch control logic referenced to GND.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.0V to 28V - Enables direct interface with 3.3V microcontrollers, 5V logic, and 12V/24V industrial bus rails without external regulators.
Operate Point (BOP)	+25G typical - Activates output at low magnetic field strength, suitable for small magnets or air-gap tolerant designs.
Release Point (BRP)	–25G typical - Ensures clean latching with 50G hysteresis, preventing chatter near threshold in noisy mechanical environments.
Output Type	Open-drain - Allows flexible pull-up to any voltage ≤32V, supporting level-shifting and wired-OR configurations.
Start-Up Time	10µs typical - Guarantees valid output state within microseconds of VDD reaching 3V, critical for fast-response motor timing.
ESD Rating	HBM ±6kV - Provides robust handling during PCB assembly and field service in consumer and industrial settings.
Operating Temperature	–40°C to +125°C - Validated for under-hood automotive-adjacent applications and sealed motor housings.

Pinout & Package

Package: SC59 - 3-pin surface-mount package with gull-wing leads, 2.80–3.10mm body length, 1.50–1.70mm width, and 0.35–0.50mm thickness; optimized for automated placement and thermal dissipation in compact motor modules.

Pin/Terminal	Circuit Role	Design Meaning
1	VDD	Positive supply input with integrated reverse-blocking diode and 28V zener clamp - withstands –32V reverse battery transients and suppresses supply spikes.
2	GND	Ground reference for all internal circuits and output switch - must be low-impedance path to minimize noise coupling into chopper amplifier.
3	OUTPUT	Open-drain NMOS output with 30–55mA current limit - sinks load current when latched; requires external pull-up for logic-level signaling.

Key Features

Feature	Design Value
Bipolar Latch Operation	South-pole turn-on / North-pole turn-off enables absolute position detection without external polarity logic or dual sensors.
Chopper-Stabilized Architecture	Reduces thermal drift of BOP/BRP to ±15G over –40°C to +125°C, eliminating need for calibration in production.
Integrated Supply Protection	Reverse-blocking diode + zener clamp allows direct connection to unregulated 24V battery systems with no external protection components.
RF Noise Immunity	Validated against common EMC test profiles - maintains switching integrity in proximity to BLDC inverter switching noise (up to 100MHz).
Lead-Free & Green Compliance	Fully RoHS 3 compliant with <900ppm Br+Cl and <1000ppm Sb - meets global environmental requirements for consumer and industrial shipments.

Applications

Brushless DC Motor Commutation

RPM Measurement

Use Scenario: Detecting rotor magnet polarity in 3-phase BLDC motors for electronic commutation timing.

IC Role / Device Role / Timing Role: Hall latch providing synchronized edge-triggered signals to MCU timer capture inputs for precise 120° electrical phase alignment.

Use Value: Enables sensor-based FOC or trapezoidal drive with <1µs timing jitter, supporting motor speeds up to 30,000 RPM at 24V supply.

Use Scenario: Counting magnetic transitions from rotating gear or shaft-mounted magnet in flow meters or fan tachometers.

IC Role / Device Role / Timing Role: Digital pulse generator converting mechanical rotation into TTL/CMOS-compatible square wave output.

Use Value: Delivers stable 0.2–1µs rise/fall times across 3–28V supply, enabling accurate frequency measurement down to 1Hz and up to 100kHz.

Linear Encoder Position Sensing

Contactless Angular Indexing

Use Scenario: Detecting discrete positions along a linear rail using alternating-pole magnetic strip in office equipment or industrial actuators.

IC Role / Device Role / Timing Role: Position latch generating step-wise digital output aligned to physical travel increments.

Use Value: Achieves ±0.1mm positional repeatability at 1mm pitch due to 50G hysteresis and <10µs start-up latency.

Use Scenario: Identifying home/index position in rotary encoders for robotic joints or appliance drum alignment.

IC Role / Device Role / Timing Role: Zero-reference detector triggering MCU interrupt on first South-to-North transition per revolution.

Use Value: Eliminates mechanical switches with >10M cycle lifetime and immunity to dust, moisture, and vibration in washing machine or HVAC applications.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL3772QUTDT-13	Same BOP/BRP specs but AEC-Q100 Grade 1 qualified; higher ESD (8kV HBM); SIP-3 only	Automotive-grade qualification required for engine bay or transmission control units	Select when ISO/TS 16949 compliance and extended temperature validation (-40°C to +150°C) are mandatory
US1881EUA-13	Lower voltage range (2.5–24V); ±35G sensitivity; no reverse-battery protection; SOT-23 only	Suitable for cost-sensitive, low-voltage consumer devices where 28V operation is unnecessary	Choose for 3.3V/5V-only systems with tighter BOP tolerance needs and no reverse-polarity risk

Compared with AL3772QUTDT-13 and US1881EUA-13, the AH3772-W-7 uniquely balances industrial-grade 28V operation, integrated reverse-battery protection, and SC59 package compatibility - making it optimal for non-automotive 24V motor control where space, ruggedness, and supply resilience are prioritized over AEC-Q100 certification.

Availability

AH3772-W-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and contactless angular indexing requiring stable component supply across industrial automation, home appliance, and personal care product lifecycles.

Supply support for AH3772-W-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.

The AH3772 belongs to Diodes' high-voltage Hall effect sensor product line, engineered specifically for reliable magnetic position and speed sensing in harsh, wide-input-voltage environments such as motor drives and industrial instrumentation.

FAQ

What is the maximum continuous output current rating for AH3772-W-7?

The AH3772-W-7 has a guaranteed output current limit of 30–55mA under latch-on conditions, protecting the internal NMOS switch from thermal runaway during sustained short-circuit or heavy capacitive loading. This limit is enforced by on-die current sensing and remains stable across –40°C to +125°C ambient temperatures.

Does AH3772-W-7 require an external bypass capacitor?

Yes - a 10nF to 100nF ceramic capacitor between VDD and GND is recommended per the datasheet to stabilize the internal bandgap regulator and improve RF noise immunity. Without it, the device may exhibit erratic switching during fast supply transients or high-frequency EMI exposure.

Can AH3772-W-7 operate with a 3.3V microcontroller I/O rail?

Yes - the AH3772-W-7's open-drain output is compatible with 3.3V logic when pulled up to 3.3V, and its minimum operating voltage is 3.0V. However, the output low voltage (VOUT_ON) remains ≤0.4V at 20mA, ensuring solid logic-low margin even at 3.3V supply.

Is the SC59 package of AH3772-W-7 pin-compatible with SOT-23 variants?

No - although both are 3-pin surface-mount packages, SC59 and SOT-23 have different lead pitch (0.95mm vs 0.915mm), body dimensions, and pin 1 orientation. PCB footprints and stencil apertures must be redesigned; they are not drop-in replacements despite functional equivalence.

AH3772-W-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Function:: Latch

Technology:: Hall Effect

Polarization:: South Pole

Sensing Range:: 4mT Trip, -4mT Release

Test Condition:: -40°C ~ 125°C

Voltage - Supply:: 3V ~ 28V

Current - Supply (Max):: 4mA

Current - Output (Max):: 60mA

Output Type:: Open Drain

Features:: Temperature Compensated

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SC-59-3

AH3772-W-7 FAQ

1.How can I place an order for AH3772-W-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3772-W-7 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 AH3772-W-7 reliable?

The price and inventory of AH3772-W-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3772-W-7 is usually 5 days.

3.What payment methods are accepted for AH3772-W-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3772-W-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3772-W-7?

AH3772-W-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH3772-W-7 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 AH3772-W-7?

For technical support, including AH3772-W-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3772-W-7 requirements.

6.How does Aetrix verify that AH3772-W-7 is sourced from the original manufacturer or authorized distributors?

All AH3772-W-7 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 AH3772-W-7 meets industry standards.

7.What is the process for return or replacement of AH3772-W-7?

All AH3772-W-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3772-W-7, 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 AH3772-W-7 part is unused and in its original packaging.

Return procedure for AH3772-W-7:

1.Submit a request within 90 days.

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

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