MOC3042VM

Triac, SCR Output Optoisolators Overview

The MOC3042VM is a zero-crossing triac output optocoupler manufactured by onsemi. It features a PhotoTriac output and integrates an internal zero-crossing detection circuit for low-noise switching. The device provides robust electrical isolation with a rated insulation voltage of 5250 Vrms and operates within a temperature range of -40°C to +85°C. Key electrical parameters include a maximum forward current of 60 mA, a forward voltage of 1.25 V, and a power dissipation of 250 mW. The off-state output voltage (VDRM) is rated at 400 V, with a maximum trigger current of 10 mA.

Triac, SCR Output Optoisolators Feature Summary

• Integrates a zero-crossing detection circuit to minimize electromagnetic interference during switching events.
• Provides high-voltage isolation between input and output circuits using a PhotoTriac configuration.
• Designed for through-hole mounting in standard PDIP-6 packages.

Triac, SCR Output Optoisolators Applications

• Solid-state relay driver circuits
• AC motor speed control systems
• Lighting dimmer applications

Triac, SCR Output Optoisolators Procurement Notes

Verify the specific suffix 'VM' against the manufacturer's latest datasheet to confirm package type and compliance status. Ensure that the required isolation voltage ratings align with the target application's safety standards. Cross-reference the component marking with official documentation to distinguish from similar variants within the MOC304 series family.

Triac, SCR Output Optoisolators Selection Notes

Select this component when low-noise AC switching is required without external zero-crossing logic. The integrated detection simplifies design compared to non-zero-crossing alternatives. Consider the 400 V off-state voltage rating relative to the peak line voltage. Verify thermal management requirements given the 250 mW power dissipation limit in the specified operating temperature range.

Triac, SCR Output Optoisolators Part Context

This device belongs to the MOC304 series of triac and SCR output optocouplers. It shares functional similarities with other members like the MOC3041 and MOC3043, differing primarily in trigger current specifications and zero-crossing thresholds. The series is widely used in industrial control and consumer electronics for isolating low-power control signals from high-power AC loads.

Triac, SCR Output Optoisolators Replacement Considerations

• MOC3041VM
• MOC3043VM

Triac, SCR Output Optoisolators FAQ

What is the purpose of the internal zero-crossing circuit?

The internal zero-crossing circuit ensures that the output triac turns on only when the AC line voltage is near zero, significantly reducing electromagnetic interference and inrush current.

What is the maximum off-state output voltage rating?

The MOC3042VM supports a maximum off-state output voltage (VDRM) of 400 V.