What the AQY232SZ is — and what it switches
The AQY232SZ is a PhotoMOS™ AQY-series solid-state relay (SSR) in the 4-SOP (0.173", 4.40 mm wide) surface-mount package with gull-wing termination — the 4-SOP form factor is compact enough for dense signal-level boards but demands reflow or careful hot-air rework; the gull-wing leads are standard for SMD assembly and are visually unambiguous for orientation on a board. The circuit is SPST-NO (single-pole single-throw normally open) — the relay closes when the input LED is energised and stays open when it is not, which is the standard configuration for switching a load under PLC or MCU control. Rated load voltage spans 0 V to 60 V DC (or peak AC), placing this squarely in low-voltage DC control and instrumentation territory — the kind of 24 V logic rails common in industrial automation and building control, not in high-voltage AC power switching.
Load current and on-resistance — what the numbers mean at the board level
Maximum load current is 500 mA — that is the ceiling for what the output stage carries without derating. The 1.25 VDC input turn-on voltage is the critical interface spec — a 3.3 V MCU GPIO can drive this directly without a level-shifting transistor, and even a 1.8 V logic rail has enough margin to guarantee the LED fires reliably. Check the LED forward current requirement against your drive pin current limit before committing.
Packaging, sourcing posture, and BOM fit
Listed as Active on the Panasonic Electric Works lifecycle register.