Diodes Incorporated AH3713A-SA-7

Overview

AH3713A-SA-7 from Diodes Incorporated is a high-voltage bipolar Hall-effect latch IC designed for brushless DC motor commutation and position sensing in industrial appliances and personal care devices. It operates from 3.0V to 27V, features ±30G typical operate/release points (BOP/BRP), chopper-stabilized architecture for temperature stability, and a single open-drain output with internal pullup resistor (10–18 kΩ) and 30–60 mA current limit.

For engineers reviewing the AH3713A-SA-7 datasheet, AH3713A-SA-7 pinout, AH3713A-SA-7 application, or AH3713A-SA-7 equivalent, key selection criteria include magnetic sensitivity tolerance across -40°C to +125°C, 40V load dump protection, 13 µs startup time, and compatibility with SOT23 (Type S)/SC59 package footprints in space-constrained BLDC rotor position feedback circuits.

Technical Context

The AH3713A-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, low-pass filtering, and sample-and-hold circuitry to suppress thermal drift and mechanical stress effects on switching thresholds. Its bandgap-regulated internal supply ensures stable operation across the full 3.0V–27V input range.

It functions as a bipolar latch: South pole exposure switches the open-drain output low (V_{OUT_ON} ≤ 0.42 V at 20 mA), and North pole exposure releases it-latching until magnetic reversal crosses the hysteresis window (B_HY = |BOP| − |BRP| = 30–90 G). Output timing includes 10 µs magnetic-to-output delay and sub-1 µs rise/fall times with 1 kΩ pullup and 20 pF load.

Key Specifications

Pinout & Package

Package: SOT23 (Type S) / SC59 - industry-standard 3-pin surface-mount package with 2.9 mm × 1.3 mm footprint and 1.45 mm height, optimized for automated placement in compact motor control PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1120EUA-T and US1881EUA-ABA-000-RE, the AH3713A-SA-7 uniquely combines internal pullup, 40V transient tolerance, and full −40°C to +125°C operation-making it the only option qualified for ruggedized BLDC commutation in industrial motor drives without design compromises.

Availability

AH3713A-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow meter sensing, RPM measurement, and linear position encoding requiring stable component supply across automotive-adjacent industrial environments.

Supply support for AH3713A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and sensing applications.

The AH3713A-SA-7 belongs to Diodes' high-voltage Hall-effect latch product line, engineered specifically for reliable rotor position feedback and contactless switching in demanding motor control and instrumentation systems.

FAQ

What is the magnetic polarity behavior of the AH3713A-SA-7?

The AH3713A-SA-7 is a bipolar latch: its output switches ON (pulls low) when exposed to a sufficient South pole magnetic field perpendicular to the marked side of the SOT23 package, and switches OFF (releases high) when a sufficient North pole is applied. The latched state persists until magnetic polarity reverses beyond the release point (BRP), ensuring stable output during transient field conditions.

Does the AH3713A-SA-7 require an external pullup resistor?

No. The AH3713A-SA-7 integrates an internal pullup resistor (10–18 kΩ) on the OUTPUT pin, eliminating the need for an external component in most applications. This simplifies layout and reduces BOM count, particularly in compact flow meters and encoder modules where PCB space is constrained.

Can the AH3713A-SA-7 operate from a 24V supply in automotive environments?

Yes. While the recommended operating voltage is 3.0V–27V, the device is rated for 40V load dump transients per ISO 7637-2 Pulse 5a. This makes it suitable for 24V industrial and automotive-adjacent systems where unregulated battery rails and load dump events occur, without requiring external TVS diodes.

How does chopper stabilization improve performance in the AH3713A-SA-7?

Chopper stabilization dynamically cancels offset voltage drift caused by temperature gradients and mechanical stress. In the AH3713A-SA-7, this delivers <±0.5 G/°C switch-point drift and superior immunity to packaging-induced stress-critical for maintaining consistent BOP/BRP thresholds across thermal cycles in sealed motor housings and portable appliances.