Diodes Incorporated AH3715-SA-7

Overview

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

For engineers reviewing the AH3715-SA-7 datasheet, AH3715-SA-7 pinout, AH3715-SA-7 application, or AH3715-SA-7 equivalent, key selection criteria include magnetic sensitivity (±50G to ±90G BOP/BRP), load-dump tolerance (40V), output current capability (30–60mA), and SOT23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The AH3715 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering minimal switch-point drift (<±0.5G/°C) and superior temperature stability over its full operating range. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, enabling consistent performance from –40°C to +125°C.

It uses a bipolar latching mechanism: South pole exposure switches the open-drain output low (V_{OUT_ON} ≤ 0.42V @ 20mA), and North pole exposure releases it (I_{OUT_OFF} < 10µA). Hysteresis is fixed at 100–180G, preventing chatter near threshold transitions.

Key Specifications

Pinout & Package

Package: SOT23-3 (Type S), SC59, or SIP-3 - surface-mount, lead-free, RoHS-compliant 3-pin packages optimized for automated assembly and thermal dissipation (230mW @ T_A=25°C in SOT23).

Key Features

Applications

Equivalent & Alternatives

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

Compared with A1220LLHLT-T and US5881LUA-ABA-000-REEL, AH3715-SA-7 provides wider supply range, higher temperature rating, and stronger magnetic thresholds-making it optimal for industrial BLDC drives and high-reliability metering where long-term stability under stress is mandatory.

Availability

AH3715-SA-7 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-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 industrial, computing, and consumer markets.

AH3715 belongs to the AH37xx high-voltage Hall-effect latch family, engineered specifically for robust position and speed sensing in harsh environments-including home appliance motors, flow meters, and industrial encoders.

FAQ

What is the magnetic polarity behavior of AH3715-SA-7?

The AH3715-SA-7 is a bipolar latch: it turns ON (pulls OUTPUT low) when exposed to a sufficient South pole magnetic field perpendicular to the marked side of the SOT23 package, and turns OFF (releases OUTPUT) when a sufficient North pole is applied. This behavior is confirmed in DS46066 Rev. 1–2, page 5, and applies consistently across its full –40°C to +125°C operating range.

Does AH3715-SA-7 include an internal pullup resistor?

No - AH3715 is the open-drain-only variant. Only the AH3715A version includes an internal 10–18kΩ pullup resistor. The AH3715-SA-7 requires an external pullup resistor (typically 1kΩ–10kΩ) between VDD and OUTPUT to establish a valid logic-high state when the output is inactive.

Can AH3715-SA-7 withstand automotive load dump transients?

Yes - AH3715-SA-7 is rated for 40V transient supply voltage (VDD), meeting ISO 7637-2 Pulse 5a requirements for 12V automotive systems. This rating is specified in the Absolute Maximum Ratings table (page 4, DS46066), and validated through internal stress testing per Diodes Incorporated's quality protocol.

What is the minimum recommended bypass capacitor for AH3715-SA-7?

The datasheet recommends a 10nF to 100nF ceramic capacitor (CIN) between VDD and GND, placed as close as possible to the device pins. This stabilizes the internal regulator and improves RF noise immunity - confirmed in Figure 1 (Typical Applications Circuit) and Note 4 on page 3 of DS46066 Rev. 1–2.