Diodes Incorporated AH3717-SA-7

Overview

AH3717-SA-7 from Diodes Incorporated is a high-voltage bipolar Hall-effect latch IC designed for position sensing and commutation in brushless DC motors, flow meters, and linear encoders. It operates from 3.0V to 27V, features ±140G 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 AH3717-SA-7 datasheet, AH3717-SA-7 pinout, AH3717-SA-7 application, or AH3717-SA-7 equivalent, this device supports robust magnetic sensing in industrial motor control, RPM measurement, and contactless angular indexing where wide supply range, high hysteresis (280G typ), and load-dump immunity are critical.

Technical Context

The AH3717-SA-7 implements a chopper-stabilized Hall sensor with dynamic offset cancellation, delivering minimal switch-point drift over temperature and supply voltage. Its bipolar latch behavior requires South pole activation (B > +140G) to pull output low and North pole deactivation (B < –140G) to release.

Internal bandgap regulation ensures consistent internal biasing across 3.0–27V operation, while the open-drain output includes overcurrent limiting (30–60mA) and 40V transient load-dump protection. Startup time is 13µs typical after VDD reaches 3V.

Key Specifications

Pinout & Package

Package: SOT23 (Type S), SC59, or SIP-3 (Bulk Pack); AH3717-SA-7 uses SOT23 (Type S) per Diodes' standard marking and ordering convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3717TSA-7, AH3717-SA-7 offers identical sensing performance but distinct packaging logistics; versus SS41F, AH3717-SA-7 delivers 2.8× higher hysteresis and 40V transient resilience-critical for industrial reliability.

Availability

AH3717-SA-7 is available at Aetrix Electronics and suitable for brushless DC motor commutation, flow metering, and linear encoder position sensing requiring stable component supply across extended temperature and voltage ranges.

Supply support for AH3717-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, automotive, and consumer markets.

AH3717-SA-7 belongs to the AH37xx high-voltage Hall-effect latch family, engineered for reliable magnetic position sensing in harsh environments where wide supply range, high hysteresis, and transient immunity are mandatory.

FAQ

What is the magnetic polarity requirement for AH3717-SA-7 activation?

The AH3717-SA-7 activates (pulls OUTPUT low) when exposed to a South pole oriented toward the marked side of the SOT23 package, and releases (high-impedance) when a North pole exceeds the release point (–140G typ). This bipolar latch behavior is fixed and not configurable.

Does AH3717-SA-7 include an internal pull-up resistor?

No - AH3717-SA-7 has an open-drain output without internal pull-up. The 'A' variants (e.g., AH3717A) integrate a 10–18kΩ pull-up; AH3717 requires an external pull-up resistor, typically 1–10kΩ, to establish logic-high voltage level.

Can AH3717-SA-7 operate reliably at 27V continuously?

Yes - 27V is within its recommended continuous operating range (3.0V to 27V). The 40V absolute maximum rating applies only to transient load-dump events, not steady-state operation.

How does chopper stabilization improve performance in AH3717-SA-7?

Chopper stabilization dynamically cancels offset voltage in the Hall element and amplifier chain, reducing BOP/BRP drift to <±10G over –40°C to +125°C and minimizing sensitivity to mechanical stress - essential for precision commutation timing.