Zero-cross optoisolators are devices that convert a logic signal into an AC current signal that can drive a triac.
The Fairchild MOC3031M‑MOC3043M series are 6‑pin DIP zero‑cross optoisolators that provide a triac driver output for 115 VAC power control. They integrate an AlGaAs infrared LED with a silicon detector to achieve reliable zero‑voltage‑cross triggering for applications such as solenoid, lighting, motor, and AC power switching.
The datasheet includes electrical characteristics, absolute maximum ratings, typical application circuits, package dimensions, and ordering information. It also provides recommended LED trigger currents, dv/dt specifications, and notes on usage in hot‑line switching configurations. This manual is written in Chinese.
| Isolation Surge Voltage (VISO) | 7500 Vac(pk) |
|---|---|
| Total Device Power Dissipation (PD) | 250 mW (typical) |
| Continuous Forward Current (IF) | 60 mA |
| Reverse Voltage (VR) | 6 V |
| Peak Repetitive Surge Current (ITSM) | 1 A |
| Holding Current (IH) | 400 µA |
| LED Trigger Current (IFT) – MOC3031M / MOC3041M | 15 mA |
The isolation surge voltage is rated at 7500 Vac (peak).
For the MOC3031M the recommended LED trigger current is 15 mA, with an absolute maximum of 60 mA.
No, the optoisolator is intended only as a trigger device and must not drive a load directly.
The typical holding current is 400 µA.