APT1221SX

Overview

The Panasonic Electric Works APT1221SX is a random-phase phototriac coupler featuring a single channel with SOP-4 surface-mount packaging. It provides an isolation voltage of 3750 Vrms and supports a maximum continuous output current of 50 mA. The device operates within a temperature range of -40°C to +100°C, with a peak forward current of 50 mA and a typical forward voltage of 1.21 V. It offers a blocking voltage of 600 V and a minimum static dV/dt of 500 V/µs.

Feature Summary

• Random-phase triac output for flexible AC control applications
• High isolation voltage rating of 3750 Vrms for safety compliance
• Compact SOP-4 surface-mount package design

Applications

• Solid-state relay (SSR) modules
• AC motor speed control circuits
• Lighting dimmer systems

Procurement Notes

Verify the specific suffix 'SX' against official Panasonic documentation to confirm the SOP-4 package and 3750 Vrms isolation rating. Ensure compatibility with surface-mount assembly processes. Confirm RoHS compliance status and check for any recent product change notices that may affect specifications or availability before finalizing procurement orders.

Selection Notes

Select this component when a compact surface-mount solution is required for AC power switching. The random-phase triggering capability allows for phase-angle control, making it suitable for dimming and speed regulation. Compare the 50 mA output current limit against load requirements to ensure adequate margin for the intended application environment.

Part Context

This part belongs to the APT series of phototriac couplers from Panasonic Electric Works. It complements other variants like the APT1221A, which utilizes a DIP-4 package but shares similar electrical characteristics. The series is designed for industrial and consumer electronics requiring reliable optical isolation in AC control applications.

Replacement Considerations

APT1221AX is a documented substitute offering identical electrical performance in a DIP-4 through-hole package.