Diodes Incorporated AH3715-P-B

Overview

AH3715-P-B 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 ±70G typical operate/release points (BOP/BRP), open-drain output with 60mA current limit, and chopper-stabilized architecture for stable switching across –40°C to +125°C.

For engineers reviewing the AH3715-P-B datasheet, AH3715-P-B pinout, AH3715-P-B application, or AH3715-P-B equivalent, this device is selected for robust magnetic sensing in high-temperature, high-voltage motor control and flow metering where latch behavior, load-dump immunity, and thermal stability are critical.

Technical Context

The AH3715-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering minimal switch-point drift over temperature and supply voltage. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, enabling consistent BOP/BRP thresholds across its full 3.0V–27V range.

It uses a single-pole latching mechanism: South pole > +70G (typ.) pulls output low; North pole < –70G (typ.) releases it. The open-drain output includes overcurrent limiting (30–60mA) and supports external pullup, with 13µs startup time after VDD reaches 3V.

Key Specifications

Pinout & Package

Package: SOT23 (Type S), SC59, or SIP-3 (Bulk Pack); AH3715-P-B uses SOT23 (Type S) per Diodes Inc. ordering nomenclature and packaging documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1220LLHLT-T and US1881EUA-ABA-000-REEL, AH3715-P-B uniquely combines 40V load-dump tolerance, –40°C cold-start capability, and 140G hysteresis in a single SOT23 package-making it optimal for unregulated 24V motor control and metering where reliability trumps raw sensitivity.

Availability

AH3715-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear encoder applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3715-P-B 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 industrial, computing, and consumer markets.

AH3715-P-B belongs to the AH37xx high-voltage Hall-effect latch family, engineered for robust magnetic sensing in harsh environments such as motor drives, flow instrumentation, and appliance control systems.

FAQ

What is the magnetic polarity behavior of AH3715-P-B?

The AH3715-P-B is a bipolar latch: a sufficiently strong South pole applied to the marked side of the SOT23 package switches the open-drain output LOW (ON state); a North pole of sufficient strength switches it HIGH-Z (OFF state). This latching persists until the opposite pole exceeds its respective threshold, providing memory-like behavior without external circuitry.

Does AH3715-P-B require an external pullup resistor?

Yes - AH3715-P-B has an open-drain output and requires an external pullup resistor to define the logic HIGH voltage level. Typical values range from 1kΩ to 10kΩ depending on rise-time requirements and supply voltage. No internal pullup is present; the AH3715A variant includes one, but AH3715-P-B does not.

Can AH3715-P-B operate directly from a 24V battery system?

Yes - AH3715-P-B is rated for continuous operation from 3.0V to 27V and withstands 40V transients (load dump), making it suitable for direct connection to 24V automotive or industrial battery rails without external regulators or clamps, provided average power dissipation remains within 230mW (SOT23).

How does chopper stabilization improve performance in AH3715-P-B?

Chopper stabilization dynamically cancels offset voltage in the Hall amplifier chain, reducing BOP/BRP drift to <±15G over –40°C to +125°C and minimizing sensitivity shift with supply voltage. This eliminates the need for system-level calibration and ensures repeatable switching points across lifetime and environmental stress.