PT8A2651WEX

Sensor And Detector Interfaces Overview

The PT8A2651WEX is a CMOS LSI PIR sensor light switch controller designed for automatic lamp control. It operates at a typical voltage of 5V with an average supply current of 120µA. The device integrates operational amplifiers, a comparator, timer, zero crossing detector, and a voltage regulator. It features a 16KHz system oscillator and adjustable output duration via external RC components. The chip provides ON/AUTO/OFF modes selectable by the MODE pin and includes override functions. It outputs positive pulses to drive TRIACs and incorporates CDS input for daytime/night auto-detection with a 40-second warm-up period.

Sensor And Detector Interfaces Feature Summary

• Integrates dual operational amplifiers and a window comparator for precise PIR signal processing
• Includes on-chip regulator providing stable 3.6V supply for analog front-end circuits
• Features built-in noise rejection circuit and Schmitt trigger inputs for ZC and CDS signals
• Supports override control and quick check mode for simplified installation

Sensor And Detector Interfaces Applications

• Automatic PIR lamp control systems
• Motion-activated lighting switches
• Smart home illumination controllers

Sensor And Detector Interfaces Procurement Notes

Verify the component designation against official Diodes Incorporated or Pericom Semiconductor documentation to confirm functionality. Ensure the SOIC-16 package matches the required PCB footprint. Confirm that the W suffix indicates lead-free compliance as specified in the ordering information. Cross-reference electrical parameters such as operating voltage and supply current with the latest datasheet revisions before finalizing procurement.

Sensor And Detector Interfaces Selection Notes

Select this component for applications requiring integrated PIR sensing logic without external microcontrollers. The fixed 16KHz system frequency simplifies oscillator design when paired with standard RC values. Consider the 40-second power-on initialization period when designing system startup sequences. The internal regulator eliminates the need for external biasing components for the op-amps, reducing bill of materials complexity.

Sensor And Detector Interfaces Part Context

The PT8A2651 belongs to the PT8A26xx series of PIR sensor light switch controllers manufactured by Pericom Semiconductor Corporation, now part of Diodes Incorporated. This family of devices is specifically engineered for low-cost, high-reliability motion detection applications. The WEX suffix denotes the SOIC-16 package variant with tape and reel packaging options available.

Sensor And Detector Interfaces Replacement Considerations

Consult official substitution guides for compatible PIR controllers within the PT8A26xx series. Verify pin compatibility and electrical characteristics before replacing existing designs. No direct public substitute part numbers are confirmed in the provided documentation.