Triac-output optoisolator for AC load switching
The onsemi MOC3052SR2M is a single-channel optoisolator with a Triac output, rated for 600 V off-state voltage and 4170 Vrms isolation. It switches AC loads like solenoids, relays, or small motors from a low-voltage control side without a galvanic path back to the microcontroller.
No zero-crossing — phase-angle control ready
This part has no zero-crossing circuit, so the Triac fires as soon as the LED current exceeds the 10 mA trigger threshold. That makes it suitable for phase-angle dimming or soft-start applications where you need to switch on at any point in the AC cycle, not just the zero-cross. The minimum static dV/dt is 1 kV/µs, which means the output Triac won't falsely trigger from fast voltage transients on the AC line — a common failure mode in noisy industrial environments. Typical holding current is 220 µA, so once triggered, the Triac stays latched until the load current drops below that threshold near the AC zero-cross.
Surface-mount 6-SMD Gull Wing for reflow assembly
Packaged in a 6-SMD Gull Wing (6-SMD, Gull Wing) format, this optoisolator is designed for standard reflow soldering.
The base product number is MOC305, indicating it belongs to the MOC305x family of random-phase Triac optoisolators from onsemi.