AH291-PL-B

Overview

The AH291-PL-B is a monolithic fan motor controller manufactured by Diodes Incorporated, designed for brushless DC motor applications. It integrates Hall sensor capability and features two complementary open-collector drivers for direct coil driving. The device operates within a supply voltage range of 1.8V to 5.75V and supports a continuous output current of 400mA. It is housed in a compact 4-SIP package, suitable for space-constrained cooling solutions.

Feature Summary

• Integrates Hall sensor interface for precise commutation control
• Contains dual complementary open-collector drivers for direct motor coil actuation
• Monolithic design reduces external component count and board space

Applications

• Brushless DC fan motor control in computer cooling systems
• Thermal management modules requiring integrated sensing and drive
• Compact electronic devices with limited PCB area for motor drivers

Procurement Notes

Verify the specific suffix 'PL-B' against the official Diodes Incorporated datasheet to confirm pinout and electrical characteristics match your design requirements. Ensure compatibility with your system's voltage levels and thermal constraints before finalizing procurement.

Selection Notes

Select this component when a combined Hall sensor interface and dual driver solution is required for small form-factor fans. Consider the 1.8V minimum operating voltage for low-power applications and verify that the 400mA output current meets the motor's stall or running current demands.

Part Context

This part belongs to the AH291 family of monolithic fan controllers from Diodes Incorporated. These ICs are engineered to simplify brushless DC motor designs by integrating necessary control logic and power stages into a single package, replacing discrete transistor and driver combinations.

Replacement Considerations

Check for AH291-PL-13 as a potential alternative variant within the same family. Verify pin compatibility and electrical specifications before substitution.