PT8A261PEX

Sensor And Detector Interfaces Overview

The PT8A261PEX is a low-power mixed-signal CMOS LSI designed for automatic lamp control using a PIR sensor as a motion detector. It operates at an operating voltage of 5V with a standby current of 80 µA. The device features a built-in noise rejection circuit, on-chip regulator, and adjustable output on-time duration. It supports ON/AUTO/OFF modes selectable via the MODE pin and includes override functionality. The PT8A261 provides a pulse output specifically for TRIAC drive applications.

Sensor And Detector Interfaces Feature Summary

• Built-in operational amplifier filter and noise rejection circuit
• Selectable operation modes (ON, AUTO, OFF) via MODE pin
• Override function allowing manual switching from AUTO mode
• Pulse output configuration optimized for direct TRIAC drive

Sensor And Detector Interfaces Applications

• Energy saving auto-switch in garden, kitchen, bathroom, corridor, storage or yard
• Auto light in meeting room

Sensor And Detector Interfaces Procurement Notes

Verify that the ordering suffix 'PEX' corresponds to the Tape/Reel packaging format as indicated by the datasheet note regarding the 'X' suffix. Confirm the component is the PT8A261 variant intended for TRIAC drive applications rather than the PT8A262 relay version. Ensure the package type matches the DIP-16 specification provided in the mechanical information section.

Sensor And Detector Interfaces Selection Notes

Select the PT8A261PEX when designing circuits requiring a pulse output to drive TRIACs directly. This model is suitable for two-wire configurations. If a level output for relay drive is required instead, the PT8A262 variant should be considered. Verify that the external RC components connected to the OSCD pin are correctly calculated to achieve the desired turn-on duration based on the oscillator frequency.

Sensor And Detector Interfaces Part Context

The PT8A261 is part of the PT8A261/262 series manufactured by Diodes Incorporated (formerly Pericom Semiconductor). These chips are mixed signal CMOS LSIs specifically engineered for PIR sensor-based lighting control systems. The series differentiates between TRIAC drive (PT8A261) and relay drive (PT8A262) outputs while sharing core detection and control logic.

Sensor And Detector Interfaces Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.