MOC3012SR2M

MOC3012SR2M is a phototriac optocoupler (optical isolator) that provides galvanic isolation between a low‑voltage control circuit and a high‑voltage AC load. It contains an LED input and a bidirectional triac output to trigger a main triac or SCR in AC mains circuits. The MOC3012 variant is non-zero-cross (random-fire), making it suitable for phase‑angle control, dimming, motor speed control, and other applications needing controlled triggering. The SR2M suffix denotes a surface‑mount (SMT) RoHS‑compliant package. Key points: isolation up to about 5 kV RMS, low input current to drive the output, and a triac output capable of delivering triggering current to the main device. In use: drive the input LED from a microcontroller (with a series resistor); connect the output side to the gate circuit of the main triac, observing timing and dv/dt requirements. Always consult the datasheet for exact IFT, IT(RMS), and dv/dt specifications.

Direct equivalents (optocoupler triac drivers) include:
- Everlight EL3012
- Lite-On LTV-3012
- Vishay MOC3012 (same family; different packaging)
Note: check CTR and pinout for your package (SR2M is a specific SMD reel/package). Use distributor cross-references (Digi-Key, Mouser) to verify exact match and packaging.

MOC3012SR2M features:
- 1-channel optically isolated triac-driver
- Zero-cross triggering to minimize EMI
- Output drives a main triac/thyristor in AC mains circuits
- High input–output isolation (5 kV RMS typical)
- Low input drive current required to trigger (LED current suitable for microcontrollers)
- Good noise/dv/dt immunity for robust operation
- Surface-mount package, MOC3012SR2M (SMD, RoHS-compliant)

Pin count: 6 pins.
Function: The MOC3012SR2M is a phototriac optocoupler (triac driver) — it uses an LED input to optically drive a photosensitive triac output. It provides galvanic isolation between a low‑voltage control circuit and an AC mains switching element, allowing safe triggering of triacs/thyristors or AC loads without a direct electrical connection.

The MOC3012SR2M is manufactured by Vishay Intertechnology (Vishay Semiconductors). Vishay is a global electronic-components company that designs and manufactures discrete semiconductors and passive components (resistors, capacitors, diodes, transistors, optocouplers, etc.); it is a publicly traded, multinational supplier headquartered in the United States.

Key application areas for MOC3012SR2M (random-phase opto-triac driver):
- Galvanically isolated gate drive for mains triacs/SCRs
- Phase-angle and burst-fire control (non-zero-cross triggering)
- AC dimmers (lighting) and speed control for small fans/motors
- Solid-state relays and AC switching circuits
- Any MCU/PLC control of AC loads requiring mains isolation and safe triggering

A surface-mount 6‑pin optocoupler in an SO‑6 (SMD) package.