AH291-PG-B

Overview

The AH291-PG-B is a monolithic fan motor controller manufactured by Diodes Incorporated, designed for driving small DC motors in cooling applications. It integrates two complementary open-collector drivers capable of handling up to 400mA output current. The device operates within a supply voltage range of 1.8V to 5.75V and includes Hall sensor capability for commutation control. Packaged in a compact 4-SIP format, it supports efficient thermal management and reliable operation in space-constrained electronic systems requiring precise motor speed regulation.

Feature Summary

• Integrates dual complementary open-collector drivers for direct motor coil actuation
• Supports Hall sensor input for accurate rotor position detection and commutation
• Operates across a wide supply voltage range from 1.8V to 5.75V
• Provides integrated control and power stage functionality in a single package

Applications

• Computer case cooling fans
• CPU heat sink fan controllers
• Small DC motor speed regulation systems
• Embedded thermal management units

Procurement Notes

Verify the exact suffix PG-B against the manufacturer's current datasheet to confirm pinout compatibility and electrical specifications. Ensure the component is sourced from authorized distributors to guarantee authenticity and traceability. Check RoHS compliance status if required for specific regulatory environments. Confirm lead-free certification matches project requirements before final procurement approval.

Selection Notes

Select this component when a compact solution for low-voltage DC fan control is required. It is suitable for designs needing integrated Hall sensing without external discrete components. Consider the 400mA current limit when sizing for larger motors. Evaluate the 4-SIP package constraints against available PCB real estate. Verify operating temperature ranges match the intended environmental conditions.

Part Context

This part belongs to Diodes Incorporated's portfolio of motor driver ICs focused on thermal management solutions. It replaces older discrete driver circuits by integrating control logic and power stages. The AH291 series is commonly used in consumer electronics and computer peripherals where space efficiency and cost-effectiveness are critical design parameters.

Replacement Considerations

Check Diodes Incorporated's official substitution guide for compatible alternatives. Verify pin-to-pin compatibility if replacing existing designs. Ensure voltage and current ratings meet or exceed original requirements. Confirm package dimensions fit the existing footprint.