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

Diodes Incorporated AH3712Q-P-B

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

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Part No.:: AH3712Q-P-B

Manufacturer:: Diodes Incorporated

Category:: Switches (Solid State)

Package:: 3-SIP

Datasheet:: AH3712Q-P-B.pdf

Description:: HALL LATCH SWITCH SIP-3 BULK 1K

Quantity:: RFQ Add To RFQ list

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Inventory:1,872

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Product details

Overview

AH3712Q from Diodes Incorporated is an AEC-Q100 qualified, automotive-grade Hall-effect bipolar latch IC 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 in SIP-3 packaging.

For engineers reviewing the AH3712Q datasheet, AH3712Q pinout, AH3712Q application, or AH3712Q equivalent, key selection criteria include its open-drain output with 60mA sink capability, reverse-battery protection (−18V), Zener-clamped supply, and polarity-dependent mounting orientation across SOT23/SC59/SIP-3/DFN packages.

Technical Context

The AH3712Q implements a chopper-stabilized Hall sensor with dynamic offset cancellation, low-pass filtering, and internal bandgap-regulated circuitry to maintain stable magnetic thresholds across temperature and supply voltage. Its latch behavior requires magnetic reversal-South pole activates (output low), North pole releases (output high)-with hysteresis of 20–80G to prevent chatter.

It integrates reverse-blocking diode and Zener clamp on VDD, overcurrent-limited output (30–60mA), and ESD protection (8kV HBM). The device starts up in 13µs after VDD reaches 3V, with minimum slew rate requirement of 3V/µs, and exhibits <0.1µA leakage when off at 27V.

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 per AEC-Q100 Grade 0.
BOP / BRP (Typical)	±25G - High sensitivity enables detection with small magnets or increased air gaps in motor rotor sensing.
V_{OUT_ON}	0.25V @ 20mA - Low saturation voltage minimizes power loss and self-heating in high-duty-cycle switching.
I_OUT Sink Limit	60mA - Supports direct drive of logic-level inputs or small relays without external buffer.
Hysteresis (B_HY)	20–80G - Prevents false triggering near magnetic threshold due to noise or mechanical vibration.
Start-Up Time	13µs - Ensures rapid system readiness after ignition power-on; requires ≥3V/µs VDD slew rate.

Pinout & Package

Package: SIP-3 (Straight Inline Package, 3-pin, bulk packing). Dimensions: 4.10mm × 3.00mm × 1.50mm body height, 14.50mm lead length. RoHS-compliant, lead-free, halogen-free.

Pin	Circuit Role	Design Meaning
1	VDD	Power input pin - accepts 3.0V–27V; includes reverse-blocking diode and 36V Zener clamp for load-dump and jump-start resilience.
2	GND	Ground reference - connects to system ground plane; critical for magnetic field perpendicularity and noise immunity.
3	OUTPUT	Open-drain output - sinks up to 60mA; requires external pull-up for logic-high state; polarity-sensitive activation (South pole to marking side).

Key Features

Feature	Design Value
Bipolar Latch Operation	South pole activates (output low), North pole releases (output high) - eliminates need for external polarity control logic in BLDC commutation.
Chopper-Stabilized Architecture	Reduces switch-point drift to <±0.5G/°C - maintains consistent timing accuracy across full −40°C to +150°C range.
Integrated Protection	Reverse-battery tolerance (−18V), output overcurrent limit (60mA), and 36V supply Zener clamp - reduces external protection components by ≥3 parts.
RF Noise Immunity	Validated against ISO 11452-2/4 - operates reliably in high-noise engine compartments without added shielding or filtering.
Multi-Package Support	SIP-3, SOT23, SC59, U-DFN2020-6 - allows layout flexibility: SIP-3 for through-hole prototyping, DFN for space-constrained PCBs.

Applications

Brushless DC Motor Commutation

RPM Measurement

Use Scenario: Detecting rotor magnet position in 12V/24V automotive cooling fans, EPS motors, or HVAC blowers.

IC Role / Device Role / Timing Role: Bipolar latch provides edge-triggered, polarity-resolved commutation signals synchronized to rotor rotation.

Use Value: Enables precise 6-step commutation with <1° electrical angle error, reducing torque ripple and audible noise.

Use Scenario: Monitoring gear tooth or camshaft rotation in engine management systems.

IC Role / Device Role / Timing Role: Generates clean, jitter-free pulse train proportional to rotational speed for ECU RPM calculation.

Use Value: Delivers <1% speed measurement error from 0–20,000 RPM across temperature, supporting closed-loop fuel injection timing.

Flow Meter Sensing

Angular Position Indexing

Use Scenario: Detecting turbine blade passage in automotive fuel or coolant flow meters.

IC Role / Device Role / Timing Role: Latched output toggles per blade pass, forming digital pulse count proportional to volumetric flow rate.

Use Value: Achieves ±0.5% full-scale accuracy over life, unaffected by fluid temperature shifts due to chopper stabilization.

Use Scenario: Identifying absolute crankshaft or camshaft position for variable valve timing actuation.

IC Role / Device Role / Timing Role: Provides index pulse and phase-aligned commutation edges via dual-magnet arrangement.

Use Value: Enables sub-degree crank angle resolution with <2µs propagation delay variation, meeting ASIL-B timing integrity requirements.

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 (Diodes Inc.)	Same pinout, identical BOP/BRP specs, but lacks reverse-battery protection (−18V rating) and has lower ESD rating (4kV HBM vs 8kV).	Not qualified for AEC-Q100 Grade 0; limited to cabin or non-critical subsystems where reverse polarity risk is mitigated externally.	Select only if cost sensitivity outweighs automotive robustness requirements and external reverse-protection is already implemented.
TLE4961-3U (Infineon)	Higher BOP (±35G), integrated pull-up, but narrower supply range (4.5V–28V) and no Zener clamp on VDD.	Requires external Zener for load-dump protection; better suited for 12V-only systems with stable battery regulation.	Prefer when higher magnetic immunity is needed and system-level supply clamping is available; not drop-in for unregulated 24V truck applications.

Compared with AL3712Q and TLE4961-3U, the AH3712Q uniquely combines AEC-Q100 Grade 0 qualification, −18V reverse-battery tolerance, and 36V supply Zener clamping-making it the only option qualified for direct connection to unregulated 24V commercial vehicle battery rails without supplemental protection.

Availability

AH3712Q is available at Aetrix Electronics and suitable for automotive BLDC motor control, engine RPM monitoring, flow metering, and crankshaft position sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3712Q 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 manufacturer specializing in discrete, analog, and mixed-signal solutions, with IATF 16949-certified automotive production facilities and AEC-Q100 qualification programs.

The AH3712Q belongs to Diodes' automotive Hall-effect sensor product line, engineered specifically for high-reliability rotor position and speed feedback in harsh under-hood environments.

FAQ

What is the correct magnet orientation for AH3712Q-P-B (SIP-3 package)?

For the SIP-3 package, the South pole must be presented to the part-marking side to activate the output (pull low). Reversing polarity-North pole to marking side-releases the latch. This orientation is fixed per package type and differs from SC59, where the South pole faces the non-marking side.

Does AH3712Q require an external pull-up resistor?

Yes. The AH3712Q has an open-drain output and requires an external pull-up resistor (typically 1kΩ–10kΩ) between VDD and OUTPUT to establish a valid logic-high state. Unlike the AH3712AQ variant, it does not integrate an internal pull-up resistor.

Can AH3712Q operate directly from a 24V truck battery?

Yes. Its 3.0V–27V operating range and 40V transient-rated supply pin (with integrated Zener clamp) allow direct connection to 24V systems, including load-dump events up to ISO 7637-2 Pulse 5a (120V/100ms). Reverse-battery protection extends to −18V, covering jump-start scenarios.

How does chopper stabilization improve performance in AH3712Q?

Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to <±0.5G/°C and minimizing switch-point variation across supply voltage and temperature-critical for maintaining timing accuracy in BLDC commutation and RPM measurement.

AH3712Q-P-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 3-SIP

Packaging:: Bulk

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:: Through Hole

Supplier Device Package:: 3-SIP

AH3712Q-P-B FAQ

1.How can I place an order for AH3712Q-P-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH3712Q-P-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 AH3712Q-P-B reliable?

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

3.What payment methods are accepted for AH3712Q-P-B?

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

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH3712Q-P-B?

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

Once your AH3712Q-P-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 AH3712Q-P-B?

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

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

All AH3712Q-P-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 AH3712Q-P-B meets industry standards.

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

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

Return procedure for AH3712Q-P-B:

1.Submit a request within 90 days.

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

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