Diodes Incorporated AH3726Q-P-B

Overview

AH3726Q-P-B from Diodes Incorporated is an AEC-Q100 Grade 0 qualified automotive Hall-effect bipolar latch IC designed for high-reliability position and speed sensing in brushless DC motor commutation, RPM measurement, and angular/linear encoders. It operates from 3.0V to 28V, features BOP = 80–140 G and BRP = –140 to –80 G (typ), and delivers open-drain output with 30–55 mA current limit and <0.4 V saturation voltage at 20 mA.

For engineers reviewing the AH3726Q-P-B datasheet, AH3726Q-P-B pinout, AH3726Q-P-B application, or AH3726Q-P-B equivalent, this device supports robust magnetic sensing in high-temperature automotive environments (–40°C to +150°C), offers chopper-stabilized switching with 10 µs startup time, and integrates reverse-blocking diode and zener clamp protection on VDD.

Technical Context

The AH3726Q-P-B implements a chopper-stabilized architecture with dynamic offset cancellation to minimize thermal drift of magnetic thresholds-BOP and BRP shift less than ±15 G over –40°C to +150°C. Its internal bandgap regulator supplies temperature-compensated bias to analog circuitry, ensuring stable operation across the full 3.0V–28V supply range.

It functions as a bipolar latch: South pole applied to the marked side (SOT23/SIP-3) or unmarked side (SC59) switches the open-drain output low; North pole reversal releases it. Hysteresis (BHY = 160–280 G) prevents chatter near threshold transitions under noisy or fluctuating fields.

Key Specifications

Pinout & Package

Package: SC59 (3-pin surface-mount), compatible with SOT23 (Type S) and SIP-3 footprint variants. Pin assignments are identical across all packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AL3726Q and TLE4961-3U, the AH3726Q-P-B uniquely balances Grade 0 temperature capability, high magnetic sensitivity (±110 G typ), and minimal BOM count - making it optimal for cost-sensitive, high-reliability automotive position sensing where extended temperature range is non-negotiable.

Availability

AH3726Q-P-B is available at Aetrix Electronics and suitable for brushless DC motor commutation, RPM measurement, and angular position sensing requiring stable component supply across automotive production lifecycles.

Supply support for AH3726Q-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets.

The AH372XQ series belongs to Diodes' AEC-Q100-qualified Hall-effect sensor product line, engineered specifically for high-temperature, high-reliability magnetic sensing in powertrain, chassis, and body electronics.

FAQ

What is the magnetic polarity orientation requirement for AH3726Q-P-B activation?

The AH3726Q-P-B requires a South pole applied to the part marking side for SOT23 (Type S) and SIP-3 packages, but to the non-marking side for SC59. This polarity dependency is defined by package geometry and internal die orientation - incorrect magnet placement causes failure to latch. Always verify orientation using the top-view pin diagram in DS46144 Rev. 3-2, page 5.

Does AH3726Q-P-B require an external bypass capacitor?

Yes - a 10 nF to 100 nF ceramic capacitor (CIN) between VDD and GND is mandatory for power stabilization and RF noise immunity. Without it, the device may exhibit erratic switching or increased susceptibility to conducted EMI, especially in 12 V battery environments with alternator ripple. Place CIN within 2 mm of the VDD pin per layout guidelines in DS46144 section 5.1.

Can AH3726Q-P-B drive an LED directly?

No - its open-drain output is rated for 60 mA continuous sink but lacks internal current regulation. Driving an LED directly risks overcurrent if the pull-up voltage exceeds forward voltage drop or if LED tolerance varies. Use a series current-limiting resistor (e.g., 470 Ω for 12 V supply and 20 mA target) or interface via a dedicated LED driver IC for consistent brightness and thermal safety.

How does the chopper stabilization affect timing performance?

Chopper stabilization introduces no measurable delay in output response: propagation delay (tD) remains 4 µs typical from magnetic threshold crossing to output transition, and startup time is fixed at 10 µs. The technique suppresses offset drift without adding latency - verified across –40°C to +150°C in DS46144 Figure 14 and Table 3.