QTT3213ST1

Triac, SCR Output Optoisolators Overview

The QTT3213ST1 is a single-channel power triac output optoisolator manufactured by QT Brightek. It features a 5000Vrms isolation voltage and a 600V off-state voltage capability. The device supports a maximum RMS on-state current of 900 mA with a holding current of 25 mA. It includes an integrated zero-crossing detection circuit for low EMI switching. The input LED has a typical forward voltage of 1.3V and a maximum DC forward current of 50 mA. Operating temperature ranges from -55°C to 85°C, housed in a 7-SMD surface-mount package.

Triac, SCR Output Optoisolators Feature Summary

• Integrated zero-crossing detection circuit for noise reduction
• High isolation voltage rating for safety separation
• Surface mount packaging for automated assembly

Triac, SCR Output Optoisolators Applications

• Solid state relay driver circuits
• AC motor control systems
• Industrial process control interfaces

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix ST1 against the official QT Brightek datasheet to confirm the 7-SMD package configuration and tape-and-reel orientation. Ensure that the required 900mA load capacity aligns with the thermal management design of the target PCB layout. Confirm compliance with RoHS3 standards if environmental regulations apply to the final product assembly.

Triac, SCR Output Optoisolators Selection Notes

Select this component when high-power AC switching is required with minimal electromagnetic interference due to the zero-crossing feature. Compare the 900mA RMS rating against similar models like QTT2213ST1 or QTT0213ST1 to ensure adequate current headroom. Verify that the 600V blocking voltage meets the peak line voltage requirements of the application without derating issues.

Triac, SCR Output Optoisolators Part Context

This part belongs to the QTX213 series of power triac optoisolators. It complements other variants in the family such as QTT0213ST1 and QTT2213ST1, which offer lower current ratings. The series provides standardized isolation solutions for industrial applications requiring robust triac triggering with built-in noise immunity features.

Triac, SCR Output Optoisolators Replacement Considerations

• QTT2213ST1
• QTT0213ST1

Triac, SCR Output Optoisolators FAQ

Does the QTT3213ST1 include zero-crossing detection?

Yes, the device integrates a zero-crossing circuit to minimize electrical noise during switching.

What is the maximum RMS on-state current?

The maximum RMS on-state current is 900 mA.