Diodes Incorporated AH288-YG-13

Overview

AH288-YG-13 from Diodes Incorporated is a monolithic high-voltage Hall-effect smart fan motor controller with integrated Hall sensor, dual complementary open-drain output drivers (DO/DOB), rotor-lock shutdown protection, automatic restart recovery, and FG speed-sensing output. It operates from 3.8V to 28V, delivers 400mA average output current, and is housed in a lead-free SOT89-5L package for brushless DC cooling fans in industrial power supplies and telecom equipment.

For engineers reviewing the AH288-YG-13 datasheet, AH288-YG-13 pinout, AH288-YG-13 application, or AH288-YG-13 equivalent, key selection considerations include its built-in lock-detection timing (0.46s ON / 2.76s OFF), Zener-protected outputs (V_Z = 42–65V), Hall magnetic thresholds (B_OP = 10–60 G, B_RP = −60 to −10 G), and thermal derating curve up to 100°C ambient.

Technical Context

The AH288-YG-13 implements a Hall-plate-based commutation controller with internal regulator, lock-detection logic, and periodic auto-restart-triggered when rotor stall is sensed via Hall signal absence for ≥0.46s. Its dual open-drain outputs drive external fan coil windings in push-pull configuration without external gate drivers.

FG output provides TTL-compatible frequency pulses proportional to fan RPM; V_OUT(SAT) ≤ 700mV at 300mA ensures low conduction loss; R_DS(ON) = 2.25–3.5Ω enables efficient switching at 24V supply; built-in Zener clamping (42–65V) protects outputs against inductive kickback during coil de-energization.

Key Specifications

Pinout & Package

Package: SOT89-5L - surface-mount, thermally enhanced 5-pin plastic package with exposed drain pad; RoHS-compliant, green molding compound, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fan motor controller applications.

Compared with A3921KLPTR-T and NCV7703BDR2G, AH288-YG-13 uniquely integrates Hall sensing, FG feedback, and autonomous lock-recovery in a 5-pin SOT89 package-reducing component count and firmware dependency for cost-sensitive industrial fan applications.

Availability

AH288-YG-13 is available at Aetrix Electronics and suitable for server power supply cooling, industrial PLC fan control, and telecom rectifier module designs requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AH288-YG-13 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, computing, and communications markets.

AH288-YG-13 belongs to Diodes' Smart Fan Controller product line, engineered specifically for cost-effective, self-protecting brushless DC fan drives in space-constrained, thermally demanding environments.

FAQ

What is the function of the FG pin on AH288-YG-13?

The FG (Frequency Generator) pin outputs an active-low TTL-compatible square wave whose frequency is directly proportional to fan rotational speed. Each Hall commutation event generates one pulse, enabling real-time RPM monitoring without external sensors or complex signal conditioning. The output sinks up to 10mA and has VOL ≤ 0.5V at IO = 10mA.

Does AH288-YG-13 require external pull-up resistors on DO and DOB outputs?

Yes-DO and DOB are open-drain outputs and require external pull-up resistors to Vdd (typically 10kΩ) to establish high-state voltage for driving fan coil windings. The internal Zener clamp (42–65V) protects against inductive flyback, but does not provide pull-up functionality.

How does rotor-lock protection behave during continuous stall?

When rotor stall is detected (no Hall transitions for ≥0.46s), AH288-YG-13 disables both DO and DOB outputs for 2.76s, then attempts automatic restart. This cycle repeats indefinitely until rotation resumes. During off-time, coil current drops to zero, preventing thermal damage even under prolonged blockage.

Can AH288-YG-13 operate at 30V supply?

No-absolute maximum Vdd is 30V, but recommended operating voltage is limited to 28V. Operation above 26.4V risks exceeding current limits due to reduced coil efficiency and increased power dissipation; thermal derating must be applied per the published PD vs. TA curve, and Zener clamp may activate prematurely under transients.