Diodes Incorporated AH3717-P-B

Overview

AH3717-P-B 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-P-B datasheet, AH3717-P-B pinout, AH3717-P-B application, or AH3717-P-B equivalent, this device delivers precise magnetic latching behavior with load-dump protection, RF noise immunity, and validated performance in industrial motor control and consumer appliance sensing circuits.

Technical Context

The AH3717-P-B implements a chopper-stabilized Hall sensor with dynamic offset cancellation, enabling minimal switch-point drift (<±10G over temperature) and superior thermal stability. Its internal bandgap regulator supplies temperature-compensated bias to analog blocks, ensuring consistent BOP/BRP thresholds across the full –40°C to +125°C range.

The device uses a single-pole 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 280G typical (|BOP| − |BRP|), preventing chatter near threshold transitions.

Key Specifications

Pinout & Package

Available in industry-standard SOT23 (Type S) and SC59 packages - both 3-pin surface-mount formats with identical pin mapping and thermal profile (230mW at 25°C ambient).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AH3717-P-B, AL3717TQ-13 adds automotive compliance at higher cost and different package, while US1881EUA-AM trades voltage headroom, transient protection, and output drive for lower price-making AH3717-P-B optimal for industrial 24V systems demanding reliability and wide operating margins.

Availability

AH3717-P-B 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-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.

AH3717-P-B belongs to the AH37xx high-voltage Hall-effect latch family, engineered for robust magnetic sensing in harsh environments including motor control, fluid measurement, and home appliance safety interlocks.

FAQ

Is AH3717-P-B pin-compatible with AH3715 or AH3716?

Yes - all AH37xx variants share identical SOT23/SC59 pinout (VDD-GND-OUTPUT) and package footprint. However, magnetic thresholds differ: AH3715 has ±70G BOP/BRP, AH3716 ±110G, and AH3717 ±140G. Swapping requires validation of field strength in the target application.

Does AH3717-P-B include an internal pullup resistor?

No - AH3717-P-B is open-drain only and requires an external pullup resistor. The 'A' suffix versions (e.g., AH3717A) integrate a 14kΩ typical pullup; AH3717-P-B does not. External RL values from 1kΩ to 10kΩ are commonly used depending on rise time and power budget.

What is the maximum continuous output current sink capability?

AH3717-P-B guarantees 60mA continuous output sink current (IOCL) with thermal derating above 25°C ambient. At 85°C, maximum safe sink drops to ~40mA based on its 230mW SOT23 power dissipation limit and junction-to-ambient thermal resistance.

Can AH3717-P-B withstand reverse battery connection?

No - AH3717-P-B lacks reverse-battery protection. Its absolute maximum reverse supply voltage (VDDR) is –18V, but sustained reverse polarity will damage the device. For reverse-polarity-prone applications, external protection (e.g., series diode or ideal diode controller) is required.