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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Diodes Incorporated AH288-PL-B

Name: AH288-PL-B
Brand: Diodes Incorporated
SKU: AH288-PL-B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AH288-PL-B

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 5-SIP

Datasheet:: AH288-PL-B.pdf

Description:: IC MOTOR DRIVER 3.8V-28V 5SIP

Quantity:: RFQ Add To RFQ list

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Inventory:1,000

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Product details

Overview

AH288-PL-B 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), FG speed feedback output, rotor-lock shutdown protection, and automatic recovery. It operates from 3.8V to 28V, delivers 400mA average output current, and uses SOT89-5L package for compact BLDC fan control in industrial cooling systems.

For engineers reviewing the AH288-PL-B datasheet, AH288-PL-B pinout, AH288-PL-B application, or AH288-PL-B equivalent, key selection considerations include locked-rotor protection timing (0.46s ON / 2.76s OFF), Zener-protected outputs (42–65V breakdown), FG signal generation for RPM monitoring, and thermal derating above 25°C ambient.

Technical Context

The AH288-PL-B integrates Hall plate sensing, logic-controlled commutation, and thermal-aware lock-detection circuitry. Its internal regulator powers the Hall sensor and logic, while DO/DOB drive external motor coils in complementary mode under magnetic field polarity detection (Bop = 10–60 G, Brp = −60 to −10 G).

Lock-protection activation triggers immediate driver disablement followed by periodic restart attempts (TLRP-ON = 0.46 s, TLRP-OFF = 2.76 s). The FG output provides open-collector square-wave pulses synchronized to motor rotation, enabling closed-loop speed control without external sensors.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	3.8 V to 28 V - supports wide-range DC input including 24 V industrial rails with voltage-dependent current limiting above 26.4 V
Output Current (Avg)	400 mA - sufficient to drive typical 24 V, 2 W brushless fan coils without external boost
Output Saturation	680 mV @ 300 mA - low R_DS(ON) (~2.25 Ω) minimizes conduction loss and self-heating
FG Output	Open-drain, TTL-compatible - provides direct RPM feedback to MCU GPIO or dedicated fan controller IC
Locked-Rotor Timing	0.46 s ON / 2.76 s OFF - prevents coil burnout during stall while enabling auto-recovery without host intervention
Zener Protection	42–65 V breakdown - clamps inductive kickback from motor coils, eliminating need for external TVS diodes
Operating Temp	−40 °C to +100 °C - rated for under-hood and enclosed industrial enclosure environments

Pinout & Package

Package: SOT89-5L - thermally enhanced 5-pin surface-mount package with exposed pad for improved heat dissipation; RoHS-compliant, lead-free, green molding compound.

Pin/Terminal	Circuit Role	Design Meaning
Vdd	Power Input	Primary supply rail (3.8–28 V); powers internal regulator, Hall sensor, and logic
GND	Ground Reference	Common return for all internal circuits and output drivers
DO	Motor Driver Output	Open-drain N-channel output driving one motor coil phase; requires external pull-up
DOB	Motor Driver Output	Complementary open-drain N-channel output driving second coil phase; enables 2-phase BLDC commutation
FG	Frequency Generator	Open-collector tachometer output; pulses per revolution proportional to motor speed

Key Features

Feature	Design Value
Integrated Hall Sensor	Eliminates need for external magnetic sensing components; Bop/Brp hysteresis ensures noise-immune commutation
Auto-Restart Lock Protection	Prevents thermal failure during rotor blockage via timed shutdown/retry cycle - no firmware or external watchdog required
Zener-Protected Outputs	On-chip 42–65 V Zener clamps inductive flyback, removing discrete TVS diodes and saving PCB area
FG Speed Feedback	Dedicated tachometer output enables real-time RPM monitoring and closed-loop fan control without additional ICs
SOT89-5L Thermal Design	Exposed pad and low θ_JA (156 °C/W) support 800 mW power dissipation at 25 °C ambient

Applications

Industrial Power Supply Cooling

Network Equipment Fans

Use Scenario: Forced-air cooling of 1U/2U telecom rectifiers and AC/DC modules operating continuously at 60–85 °C ambient.

IC Role / Device Role / Timing Role: Smart motor controller providing commutation, stall protection, and RPM telemetry via FG output.

Use Value: Eliminates external Hall latches and protection logic; reduces BOM count by 3–4 components while maintaining thermal safety margin.

Use Scenario: Redundant cooling in enterprise switches and routers where fan failure must trigger system alerts.

IC Role / Device Role / Timing Role: Fan driver with built-in lock detection and FG-based speed verification for health monitoring.

Use Value: FG pulse train enables precise RPM measurement; auto-restart avoids permanent fan lockout during transient dust blockage.

Medical Diagnostic Enclosures

Industrial PLC Cabinet Fans

Use Scenario: Temperature-controlled airflow in MRI auxiliary electronics cabinets requiring silent, reliable operation.

IC Role / Device Role / Timing Role: Low-noise BLDC controller with Hall-based commutation and soft-start behavior.

Use Value: Integrated Hall sensor and regulated logic reduce EMI vs. external sensor solutions; FG output feeds into diagnostic logging subsystem.

Use Scenario: Convection-assisted cooling in DIN-rail mounted PLC I/O modules deployed in factory-floor control panels.

IC Role / Device Role / Timing Role: Robust motor driver tolerant of 24 V supply ripple and ambient swings from −25 °C to +70 °C.

Use Value: Wide Vdd range (3.8–28 V) accommodates brownout conditions; Zener-clamped outputs survive inductive transients from long motor leads.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ALLEGRO A3921KLPTR-T	Higher peak current (1.5 A), integrated PWM control, but no FG output or auto-restart lock protection	Requires external microcontroller for speed regulation and fault handling	Preferred when programmable speed profiles or higher torque are needed; not drop-in for FG-based monitoring
ON SEMICONDUCTOR NCV7703BDR2G	Three-phase gate driver with SPI interface; no integrated Hall sensor or FG output	Needs external Hall sensors and MCU for commutation logic and speed reporting	Used in multi-fan systems with centralized control; adds design complexity but improves scalability

Compared with A3921KLPTR-T and NCV7703BDR2G, AH288-PL-B offers fully autonomous operation with integrated Hall sensing, FG telemetry, and self-recovering lock protection - reducing system-level firmware burden and component count in single-fan applications.

Availability

AH288-PL-B is available at Aetrix Electronics and suitable for industrial power supply cooling, network equipment fans, medical diagnostic enclosures, and industrial PLC cabinet fans requiring stable component supply across extended temperature ranges and long production lifecycles.

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

The AH288 belongs to Diodes' smart motor controller product line, designed specifically for cost-sensitive, high-volume brushless DC fan applications requiring autonomous stall protection and speed telemetry without microcontroller dependency.

FAQ

What is the function of the FG pin on AH288-PL-B?

The FG (Frequency Generator) pin is an open-collector output that delivers a square-wave signal whose frequency is directly proportional to motor rotational speed. Each pulse corresponds to one electrical cycle of commutation, enabling real-time RPM monitoring using a simple MCU counter or dedicated fan controller IC without external sensors.

Does AH288-PL-B require external pull-up resistors on DO and DOB pins?

Yes - DO and DOB are open-drain N-channel outputs and require external pull-up resistors to Vdd (typically 10 kΩ) to establish high-state voltage levels for driving motor coil windings. The datasheet recommends verifying pull-up value based on coil inductance and switching speed requirements.

How does the rotor-lock protection behave during sustained blockage?

Upon detecting rotor lock, AH288-PL-B disables both DO and DOB outputs for 0.46 seconds, then attempts restart for 2.76 seconds. This ON/OFF cycle repeats until rotation resumes. No external reset or power cycle is needed - recovery is fully autonomous and repeatable across continuous blockage events.

Can AH288-PL-B operate at 30 V supply voltage?

No - the absolute maximum supply voltage is 30 V, but recommended operating voltage is limited to 28 V. Operation above 26.4 V requires careful attention to output current limits due to reduced efficiency in motor coils; exceeding 28 V risks permanent damage and voids reliability guarantees.

AH288-PL-B Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 5-SIP

Packaging:: Bulk

Product Status:: Discontinued at Digi-Key

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Low Side (2)

Interface:: On/Off

Technology:: Power MOSFET

Step Resolution:: -

Applications:: Fan Motor Driver

Current - Output:: 400mA

Voltage - Supply:: 3.8V ~ 28V

Voltage - Load:: 3.8V ~ 28V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 5-SIP

AH288-PL-B FAQ

1.How can I place an order for AH288-PL-B through Aetrix?

Please submit a Request for Quotation (RFQ) for AH288-PL-B on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AH288-PL-B reliable?

The price and inventory of AH288-PL-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AH288-PL-B is usually 5 days.

3.What payment methods are accepted for AH288-PL-B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AH288-PL-B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AH288-PL-B?

AH288-PL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AH288-PL-B order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AH288-PL-B?

For technical support, including AH288-PL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AH288-PL-B requirements.

6.How does Aetrix verify that AH288-PL-B is sourced from the original manufacturer or authorized distributors?

All AH288-PL-B products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AH288-PL-B meets industry standards.

7.What is the process for return or replacement of AH288-PL-B?

All AH288-PL-B units undergo pre-shipment inspection (PSI). If there is an issue with AH288-PL-B, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AH288-PL-B part is unused and in its original packaging.

Return procedure for AH288-PL-B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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