The MOC3051-M and MOC3052-M consist of a AlGaAs infrared emitting diode optically coupled to a non-zero-crossing silicon bilateral AC switch (triac). These devices isolate low voltage logic from 115 and 240 Vac lines to provide random phase control of high current triacs or thyristors. These devices feature greatly enhanced static dv/dt capability to ensure stable switching perfor- mance of inductive loads.
The Fairchild MOC3051-M and MOC3052-M are 6‑pin DIP random‑phase optoisolators that combine an AlGaAs infrared LED with a non‑zero‑crossing silicon triac driver. They provide isolation up to 7500 V peak and are intended for interfacing low‑voltage logic with 115 V or 240 V AC loads such as solenoid valves, lamp ballasts, and motor controls.
The document includes absolute maximum ratings, electrical characteristics, transfer curves, and application guidance. It describes recommended current‑limiting resistor values, snubber‑less operation, and circuit examples for noisy environments, along with safety and disclaimer information.
| Isolation Surge Voltage (peak) | 7500 Vac |
|---|---|
| Continuous Forward Current (Emitter) | 60 mA |
| Reverse Voltage (Emitter) | 3 V |
| Off‑State Output Terminal Voltage | 600 V |
| Peak Repetitive Surge Current | 1 A |
| Total Device Power Dissipation @ 25 °C | 330 mW |
| Storage Temperature Range | -40 °C to +150 °C |
| Operating Temperature Range | -40 °C to +85 °C |
The devices are rated for a minimum isolation voltage of 7500 V peak.
The emitter can handle a continuous forward current of up to 60 mA.
R = Vp AC / 1 A, where Vp is the peak AC voltage.