PT8A2646WE

Sensor And Detector Interfaces Overview

The PT8A2646WE is a CMOS LSI chip designed for automatic PIR lamp control, operating at a typical voltage of 5V with an average supply current of 120µA. It features a two-stage operational amplifier for filtering and a built-in noise rejection circuit. The device includes an on-chip regulator providing approximately 3.6V output. It supports AC 220V/50Hz and 110V/60Hz applications, offering selectable ON/AUTO/OFF modes via the MODE pin. The PT8A2646WE provides a relay drive output (active high) to control loads, incorporates auto-reset functionality if the zero-crossing signal disappears for over 3 seconds, and includes a 40-second warm-up period.

Sensor And Detector Interfaces Feature Summary

• Integrated two-stage operational amplifier and comparator for precise infrared motion detection and signal filtering.
• Selectable operating modes including ON, AUTO, and OFF, controlled via the MODE pin or power switch override.
• Built-in noise rejection circuitry and Schmitt trigger inputs for CDS and ZC signals to ensure stable operation.
• On-chip voltage regulator and system oscillator for reliable standalone operation in lighting control circuits.

Sensor And Detector Interfaces Applications

• Automatic PIR lamp control systems
• AC mains-powered lighting switches
• Motion-activated security lighting

Sensor And Detector Interfaces Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm package type and lead-free status. Ensure compatibility with the target application's voltage requirements and load characteristics before finalizing procurement decisions.

Sensor And Detector Interfaces Selection Notes

Select this component for designs requiring a dedicated PIR sensor interface with integrated signal processing. Consider the relay output capability when driving higher current loads compared to TRIAC-only variants. Verify that the external RC components match the desired timing and frequency specifications.

Sensor And Detector Interfaces Part Context

This part belongs to the PT8A264X series of PIR Sensor Light Switch controllers manufactured by Diodes Incorporated. The series encompasses multiple variants differentiated by output types (TRIAC vs. Relay) and specific feature sets, all sharing a common core architecture for motion detection and light control.

Sensor And Detector Interfaces Replacement Considerations

PT8A2642WE

Sensor And Detector Interfaces FAQ

What is the function of the RELAY pin on the PT8A2646?

The RELAY pin serves as an active-high output used to drive a relay through an external NPN transistor, enabling control of connected loads.

How does the PT8A2646 handle daytime conditions?

It uses the CDS pin connected to a voltage divider with a CDS component. If the input is low (daytime), the PIR input is disabled; if high (nighttime), the PIR input becomes active after a 5-second debounce.

What happens if the zero-crossing signal is lost?

If the ZC signal disappears for more than 3 seconds, the chip automatically resets and restarts the initialization operation.