MOC3042M

Triac, SCR Output Optoisolators Overview

The MOC3042M is a six-pin DIP zero-crossing optoisolator featuring a gallium arsenide infrared emitting diode coupled to a monolithic silicon detector. It functions as a bilateral triac driver with a 400V peak voltage rating and 4170Vrms isolation voltage. The device incorporates an internal zero-voltage crossing circuit, ensuring conduction only near AC line voltage zero crossings. Key electrical parameters include a maximum forward current of 60mA, a typical dv/dt of 2000 V/µs, and an operating temperature range from -40°C to 85°C.

Triac, SCR Output Optoisolators Feature Summary

• Integrates a zero-voltage crossing circuit for noise reduction
• Provides high isolation voltage between input and output
• Features a monolithic silicon detector for reliable triac triggering

Triac, SCR Output Optoisolators Applications

• Logic control of 115 VAC power loads
• Solid-state relay (SSR) driver circuits
• Industrial motor control systems

Triac, SCR Output Optoisolators Procurement Notes

Verify the manufacturer source carefully, as Fairchild Semiconductor was acquired by onsemi. Datasheets may reference Fairchild or onsemi branding. Confirm the specific package variant matches the required mounting style, as surface mount versions exist under similar part numbers. Check for RoHS compliance status in the latest documentation.

Triac, SCR Output Optoisolators Selection Notes

Select this component when zero-crossing switching is required to minimize electromagnetic interference and inrush current. Ensure the load voltage does not exceed the 400V peak rating. Verify that the gate trigger current requirements of the controlled triac are compatible with the MOC3042M's output capabilities within the specified temperature range.

Triac, SCR Output Optoisolators Part Context

The MOC3042M belongs to the MOC303XM/MOC304XM family of zero-crossing optoisolators. It is functionally similar to the MOC3041M but distinguished by its higher 400V peak blocking voltage compared to the 250V variants. This series is designed for general-purpose AC power switching applications requiring galvanic isolation.

Triac, SCR Output Optoisolators Replacement Considerations

• MOC3041M
• MOC3043M

Triac, SCR Output Optoisolators FAQ

What is the typical dv/dt rating of the MOC3042M?

The typical static dv/dt rating is 2000 V/µs, with a guaranteed minimum of 1000 V/µs.

Does the MOC3042M support AC line voltage control?

Yes, it is designed to simplify logic control of AC power lines, such as 115 VAC systems.