PhotoMOS relay for signal-level switching
The AQY212G2S is a solid-state relay from the PhotoMOS™ AQY series, designed for signal-level AC/DC load switching where silent operation and long electrical life are needed. It switches loads up to 1.25 A at voltages from 0 V to 60 V, with a maximum on-state resistance of 500 mOhms — low enough to keep conduction losses minimal in low-power circuits.
What the ratings mean for your BOM
The 1.25 A continuous load current at 60 V covers typical signal-relay applications like sensor outputs, PLC digital I/O, and small solenoid drives — the 500 mOhm on-resistance means the voltage drop at full load is under 0.63 V, so the load sees nearly the full supply rail. The SPST-NO (1 Form A) circuit is a normally-open single-pole switch — it closes when the input LED is forward-biased, making it a direct replacement for mechanical reed relays in low-power signal paths.
Package and board integration
Supplied in tube packaging, it is suited for hand-loading or low-volume assembly; for tape-and-reel the base number AQY212 covers multiple package options — confirm the exact ordering code suffix for your reel quantity.