Diodes Incorporated AH3762Q-SA-7

Overview

AH3762Q-SA-7 from Diodes Incorporated is an AEC-Q100 Grade 0 qualified bipolar Hall-effect latch IC designed for automotive brushless DC motor commutation, RPM sensing, and angular/linear position detection. It operates from 3.0V to 28V, delivers ±25G typical magnetic operate/release points (Bop/Brp), features chopper-stabilized architecture for <±0.5G temperature drift, and uses a single open-drain output with 30–55mA current limiting - deployed in SOT23 package for compact engine control module PCBs.

For engineers reviewing the AH3762Q datasheet, AH3762Q pinout, AH3762Q application, or AH3762Q equivalent, this page provides verified magnetic thresholds, thermal derating curves, package-specific pole orientation rules, and real-world design constraints including reverse supply current up to 2.5µA at −28V and 150°C.

Technical Context

The AH3762Q implements dynamic offset cancellation via chopper stabilization at 800kHz, enabling stable switching across −40°C to +150°C without external compensation. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, while the latch function retains state until magnetic polarity reversal crosses Brp.

Magnetic polarity response depends on package type: SOT23 (AH3762Q-SA-7) requires South pole applied to the part-marking side to turn ON, and North pole to release; SC59 reverses this orientation. Output switching exhibits 3.75µs typical response delay and <1µs rise/fall times with 1kΩ pull-up and 20pF load.

Key Specifications

Pinout & Package

Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant plastic package with 1.3mm × 2.4mm footprint and 1.1mm height; optimized for high-density automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3722Q and TLE4961-2M, the AH3762Q-SA-7 uniquely combines 150°C operation, ±25G sensitivity, and full AEC-Q100 Grade 0 certification - making it the only viable choice for engine-mounted BLDC commutation and EGR valve RPM sensing where thermal margin and magnetic robustness are non-negotiable.

Availability

AH3762Q-SA-7 is available at Aetrix Electronics and suitable for automotive powertrain control, chassis position sensing, and electric power steering systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3762Q-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 analog ICs, specializing in high-reliability automotive, industrial, and computing solutions with IATF 16949-certified production facilities.

The AH3762Q belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for demanding automotive position and speed sensing applications where precision, thermal stability, and functional safety compliance are mandatory.

FAQ

What is the correct magnetic polarity orientation for AH3762Q-SA-7 (SOT23 package)?

For the AH3762Q-SA-7 in SOT23 package, the South pole must be applied to the part-marking side to activate the output (pull low); the North pole must then be applied to the same side to release it. This orientation is confirmed in the datasheet's Pin Assignments section and differs from SC59-packaged variants, which require opposite polarity alignment.

Does AH3762Q-SA-7 require an external bypass capacitor?

Yes - a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND is recommended per the Typical Applications Circuit. This stabilizes the internal bandgap regulator, improves noise immunity in high-EMI environments like engine bays, and ensures reliable start-up within the 10µs power-on time specification.

Can AH3762Q-SA-7 be used in new designs despite the "not recommended" notice?

No - Diodes explicitly states "THE AH3762Q IS NOT RECOMMENDED FOR NEW DESIGNS. PLEASE USE THE AH3722Q." While AH3762Q-SA-7 remains available for legacy production and repair, new designs should adopt AH3722Q, which offers improved parametric consistency and long-term supply assurance per Diodes' product change notification guidance.

What is the maximum allowable ambient temperature for continuous operation in SOT23 package?

At 25°C ambient, the SOT23 package supports 230mW power dissipation; this derates linearly to 0mW at 150°C. For continuous 28V operation with 20mA load, junction temperature must be calculated using θJA ≈ 435°C/W - confirming that sustained operation above 100°C ambient requires careful PCB copper area design or forced convection to maintain TJ ≤ 150°C.