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 AH3712Q-SA-7

Name: AH3712Q-SA-7
Brand: Diodes Incorporated
SKU: AH3712Q-SA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AH3712Q-SA-7

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

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

Datasheet:: AH3712Q-SA-7.pdf

Description:: HALL LATCH SWITCH SSOT23 T&R 3K

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,013

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

Product details

Overview

AH3712Q-SA-7 from Diodes Incorporated is an AEC-Q100 qualified automotive Hall-effect latch IC in SOT23 package, designed for brushless DC motor commutation and angular position sensing. It operates from 3.0V to 27V, delivers ±25G typical operate/release points (BOP/BRP), features chopper-stabilized architecture for <0.42V output saturation at 20mA, and supports -40°C to +150°C ambient operation.

For engineers reviewing the AH3712Q-SA-7 datasheet, AH3712Q-SA-7 pinout, AH3712Q-SA-7 application, or AH3712Q-SA-7 equivalent, this device is selected for high-voltage, high-sensitivity magnetic switching in engine control modules, transmission sensors, and EPS motor feedback systems where robustness against reverse battery, ESD (8kV HBM), and thermal drift is critical.

Technical Context

The AH3712Q-SA-7 implements a chopper-stabilized bipolar latch with dynamic offset cancellation, enabling stable magnetic threshold performance across temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, while the open-drain output includes overcurrent limiting (30–60mA) and Zener clamping (36V).

Magnetic polarity response is package-dependent: for SOT23 (SA), the south pole applied to the part-marking side activates the output (BOP = +25G typ), and north pole deactivates it (BRP = −25G typ); hysteresis is 50G typical. The device starts up in 13µs after VDD reaches 3V, with minimum slew rate requirement of 3V/µs.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.0V to 27V - enables direct connection to automotive battery rails without external regulation.
Operating Temperature	−40°C to +150°C - qualified for under-hood and transmission-mounted applications.
BOP / BRP (Typ)	±25G - high sensitivity allows detection with small magnets or increased air gaps.
V_{OUT_ON} @ 20mA	0.25V to 0.42V - low saturation voltage minimizes power loss and heat generation in switched loads.
Output Type	Open-drain - supports flexible pull-up configuration and wired-OR interfacing with microcontrollers.
ESD Robustness	HBM: 8kV, CDM: 1kV - meets automotive system-level ESD immunity requirements.
Reverse Battery Protection	Withstands −18V supply (IDD_R ≤ 2.3mA) - eliminates need for external blocking diode in 12V/24V systems.

Pinout & Package

Package: SOT23 (JEDEC TO-236AB), 3-pin surface-mount, 2.9mm × 1.3mm footprint, 0.95mm height, lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1 - VDD	Positive supply input	Accepts 3.0–27V; includes reverse-blocking diode and 36V Zener clamp for fault protection.
2 - GND	Ground reference	Common return for internal regulator, logic, and output stage; connects to PCB ground plane.
3 - OUTPUT	Open-drain output	Sinks up to 60mA; requires external pull-up; latched state changes only on magnetic polarity reversal.

Key Features

Feature	Design Value
Bipolar latch operation	South-pole activation / North-pole release on part-marking side - simplifies mechanical mounting alignment in BLDC rotor position sensing.
Chopper-stabilized architecture	Reduces switch-point drift to <±0.5G/°C - ensures consistent timing accuracy across full automotive temperature range.
Integrated protection	Reverse-battery diode + Zener clamp on VDD, plus output overcurrent limit - reduces BOM count by eliminating 3 discrete protection components.
High RF noise immunity	Validated per ISO 11452-2 - maintains reliable switching in electric power steering and engine control environments with high EMI.
AEC-Q100 Grade 0 qualification	Qualified to −40°C to +150°C ambient - certified for safety-critical drivetrain and chassis applications.

Applications

Brushless DC Motor Commutation

RPM Measurement

Use Scenario: Detecting rotor magnet position in 3-phase BLDC motors for electronic commutation in electric power steering (EPS) and HVAC blower systems.

IC Role / Device Role / Timing Role: Provides synchronized digital edge transitions to MCU timer inputs for precise 6-step commutation sequencing.

Use Value: ±25G sensitivity enables use of compact ferrite magnets and tolerates ±0.3mm air gap variation without false triggering.

Use Scenario: Monitoring rotational speed of crankshaft, camshaft, or wheel speed sensors in engine management and ABS modules.

IC Role / Device Role / Timing Role: Generates clean, jitter-free pulse trains proportional to shaft RPM; output edges trigger MCU capture timers.

Use Value: 13µs startup time and 500kHz chopping frequency suppress thermal drift-induced timing errors below 0.1% over −40°C to +150°C.

Flow Meter Sensing

Angular Position Indexing

Use Scenario: Detecting rotation of turbine or paddle-wheel in automotive fuel or coolant flow meters.

IC Role / Device Role / Timing Role: Converts mechanical rotation into fixed-frequency square wave for microcontroller pulse counting.

Use Value: Open-drain output interfaces directly with 3.3V/5V MCUs; low V_{OUT_ON} ensures minimal self-heating during continuous 1kHz+ switching.

Use Scenario: Providing absolute angular index pulses for throttle valve or suspension angle feedback in ADAS actuators.

IC Role / Device Role / Timing Role: Latched output holds state between magnetic transitions, enabling position memory without MCU polling.

Use Value: 50G typical hysteresis prevents chatter at magnetic transition boundaries, ensuring single-edge-per-index reliability.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL3712Q-W-7	SC59 package; opposite magnetic polarity orientation (south pole to non-marking side); identical electrical specs.	Requires reversed magnet placement vs. SOT23; same thermal derating (230mW @ 25°C).	Select when board layout uses SC59 footprint or when mechanical constraints favor top-side magnet access.
SS41F (Honeywell)	Unregulated 4.5–24V operation; ±35G BOP/BRP; no reverse-battery protection; 5V logic-compatible output.	Lacks AEC-Q100 Grade 0 rating; not qualified for under-hood >125°C ambient; requires external reverse-protection diode.	Use only in non-safety-critical cabin applications with stable 5V supply and lower temperature requirements.

Compared with AL3712Q-W-7, AH3712Q-SA-7 offers simplified magnet orientation for SOT23 layouts; versus SS41F, it provides full automotive-grade protection, wider voltage tolerance, and guaranteed high-temperature stability-critical for engine bay deployment.

Availability

AH3712Q-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and angular position indexing requiring stable component supply in automotive production programs.

Supply support for AH3712Q-SA-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 manufacturer of discrete semiconductors and ICs, specializing in high-reliability solutions for automotive, industrial, and computing markets.

AH3712Q-SA-7 belongs to Diodes' AEC-Q100 qualified Hall-effect sensor family, engineered specifically for demanding automotive position and speed sensing applications with extended temperature and voltage resilience.

FAQ

What is the magnetic polarity orientation for AH3712Q-SA-7 in SOT23 package?

For the AH3712Q-SA-7 (SOT23), the south pole must be applied to the part-marking side to activate the output (BOP ≈ +25G). The north pole applied to the same side releases the output (BRP ≈ −25G). This orientation is confirmed in the datasheet's Pin Assignments and Magnetic Characteristics sections and differs from the SC59 variant.

Does AH3712Q-SA-7 require an external pull-up resistor?

Yes - AH3712Q-SA-7 has an open-drain output and requires an external pull-up resistor (RL) to VDD or another logic rail. Typical values range from 1kΩ to 10kΩ depending on rise-time and noise immunity needs; the datasheet recommends 10nF–100nF bypass capacitor (CIN) at VDD for stabilization.

Can AH3712Q-SA-7 operate with a 3.3V microcontroller I/O interface?

Yes - although its supply range is 3.0V–27V, the open-drain output can be pulled up to 3.3V, making it compatible with 3.3V MCUs. Output low voltage remains ≤0.42V at 20mA sink current, ensuring valid logic-low recognition. No level-shifting circuitry is required.

Is AH3712Q-SA-7 pin-compatible with AH3712AQ-SA-7?

No - AH3712AQ-SA-7 integrates an internal 10–18kΩ pull-up resistor and is functionally distinct. While both share identical pinout (VDD/GND/OUTPUT), AH3712Q-SA-7 requires external pull-up and offers higher flexibility in logic-rail selection, whereas AH3712AQ-SA-7 is optimized for simplified 5V-only designs.

AH3712Q-SA-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:: Active

Function:: Latch

Technology:: Hall Effect

Polarization:: North Pole, South Pole

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

Test Condition:: -40°C ~ 150°C

Voltage - Supply:: 3V ~ 27V

Current - Supply (Max):: 3.8mA

Current - Output (Max):: 60mA

Output Type:: Open Drain

Features:: Temperature Compensated

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

AH3712Q-SA-7 FAQ

1.How can I place an order for AH3712Q-SA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3712Q-SA-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 AH3712Q-SA-7 reliable?

The price and inventory of AH3712Q-SA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH3712Q-SA-7 is usually 5 days.

3.What payment methods are accepted for AH3712Q-SA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH3712Q-SA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3712Q-SA-7?

AH3712Q-SA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH3712Q-SA-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 AH3712Q-SA-7?

For technical support, including AH3712Q-SA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH3712Q-SA-7 requirements.

6.How does Aetrix verify that AH3712Q-SA-7 is sourced from the original manufacturer or authorized distributors?

All AH3712Q-SA-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 AH3712Q-SA-7 meets industry standards.

7.What is the process for return or replacement of AH3712Q-SA-7?

All AH3712Q-SA-7 units undergo pre-shipment inspection (PSI). If there is an issue with AH3712Q-SA-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 AH3712Q-SA-7 part is unused and in its original packaging.

Return procedure for AH3712Q-SA-7:

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…