VO4256H

Overview

The VO4256H is a non-zero-crossing photo-triac output optocoupler manufactured by Vishay Semiconductor Opto Division. It features a single channel with an insulation voltage of 5300 Vrms and a peak repetitive off-state voltage (VDRM) of 600 V. The device supports a maximum continuous output current of 300 mA and operates within a temperature range of -55°C to +100°C. Key electrical parameters include a forward current of 60 mA, a forward voltage of 1.2 V, and a power dissipation of 600 mW. The maximum trigger current is specified at 2 mA.

Feature Summary

• High dV/dt capability for noise immunity
• Low input current requirement for efficient driving
• Non-zero-crossing switching for phase control applications

Applications

• Solid state relays
• Motor controls
• Lighting controls

Procurement Notes

Verify the specific suffix designation when ordering, as packaging variations exist. Confirm availability status directly with authorized distributors or the manufacturer, as supply levels fluctuate. Ensure the selected package type matches the intended PCB layout requirements before finalizing procurement decisions.

Selection Notes

Select this component for circuits requiring high isolation voltage and fast triac triggering without zero-crossing delay. Compare the 600 V blocking voltage against system line voltages to ensure adequate safety margins. Consider the 2 mA trigger current sensitivity for low-power microcontroller interfaces.

Part Context

This part belongs to the VO425x series of phototriac optocouplers from Vishay. It shares common characteristics with siblings like the VO4254H and VO4258H, primarily differing in their off-state voltage ratings. The series is designed for general-purpose AC load switching where precise timing relative to the AC waveform zero-crossing is not required.

Replacement Considerations

Direct substitutes include the VO4256M, which offers similar performance but may have different trigger current specifications. Verify pinout compatibility and thermal characteristics when cross-referencing with other manufacturers' equivalents.