VO4256M

Overview

The VO4256M is a single-channel non-zero-crossing photo-triac optocoupler manufactured by Vishay Semiconductor Opto Division. It features a 600 V off-state voltage (VDRM) and supports a maximum continuous output current of 300 mA. The device provides an isolation voltage of 5300 Vrms, ensuring robust electrical separation between input and output circuits. It operates with a maximum forward current of 60 mA and has a peak trigger current of 3 mA. The component is housed in a PDIP-6 package for through-hole mounting and functions within a temperature range of -55°C to +100°C.

Feature Summary

• Non-zero-crossing triac output design enables immediate load control without waiting for AC line zero crossings.
• High insulation capability of 5300 Vrms ensures safe isolation between control and power circuits.
• Robust static dV/dt rating prevents false triggering during rapid voltage transients.

Applications

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

Procurement Notes

Verify the specific suffix designation when ordering, as it indicates the packaging format. Standard tube packaging differs from tape-and-reel configurations. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as regulatory status may vary by production batch. Ensure the selected variant matches the required mounting style for the target PCB layout.

Selection Notes

Select this component when immediate phase-angle firing is required rather than zero-voltage switching. The 600 V blocking voltage suits standard low-voltage AC loads. Verify that the 3 mA trigger current aligns with the driving logic levels. Consider thermal management for the 600 mW power dissipation limit in high-duty-cycle applications.

Part Context

This device belongs to the VO425x family of triac output optocouplers. Variants such as VO4256D and VO4258M share similar pinouts and isolation ratings but differ in peak trigger current and off-state voltage specifications respectively. The VO4256M specifically balances moderate trigger sensitivity with standard 600 V blocking capability.

Replacement Considerations

Direct substitutes include VO4256D (lower trigger current) and VO4258M (higher voltage rating). Cross-reference datasheets for exact parameter matching regarding trigger current and blocking voltage before substitution.