AH2985-P-B

Overview

The AH2985-P-B is a single-chip Hall-effect smart fan motor controller designed for driving two-coil brushless direct current (BLDC) fans and motors. It integrates a Hall-effect sensor and dynamic commutation logic to manage motor operation efficiently. The device operates within a supply voltage range of 2.5V to 15V and supports an output current of 500mA. It is housed in a 4-pin TO-94 package, suitable for through-hole mounting. The component functions reliably across an operating temperature range of -40°C to 105°C.

Feature Summary

• Integrates Hall-effect sensing and dynamic commutation for brushless DC motor control
• Designed specifically for two-coil BLDC fan and motor applications
• Single-chip solution reducing external component requirements

Applications

• Two-coil brushless DC fan systems
• Small BLDC motor drives
• Thermal management units requiring integrated Hall sensing

Procurement Notes

Verify current availability status as the AH2985-P-B has been identified in public product change notifications as obsolete or legacy by Diodes Incorporated. Confirm lead times and substitute options with authorized distributors before finalizing procurement plans. Ensure design-in decisions account for potential end-of-life constraints.

Selection Notes

Select this component for low-power two-coil BLDC applications requiring integrated Hall sensing. Verify that the required supply voltage falls within the 2.5V to 15V range and that the load current does not exceed 500mA. Consider the TO-94 package constraints for thermal and mechanical integration in the target enclosure.

Part Context

This part belongs to Diodes Incorporated's portfolio of PMIC motor drivers and controllers. It serves as a specialized solution for simple BLDC fan applications, distinguishing itself from more complex multi-phase controllers by integrating both power switching and sensing elements into a compact form factor.

Replacement Considerations

Public documentation indicates the AH2985-P-B is obsolete. Review Diodes Incorporated PCN-2654 for official replacement recommendations or alternative part numbers. Consult distributor databases for cross-reference data from other manufacturers if necessary.