PhotoMOS AQY series — RF-rated solid-state relay in a 4-SSOP footprint
The Panasonic AQY221N2V1Y is a PhotoMOS AQY-series solid-state relay with a SPST-NO (1 Form A) output, rated for 120 mA continuous load current across a 0 V to 40 V load voltage range. The 1.14 VDC input threshold lets it switch directly from low-voltage logic rails without an external driver.
RF-rated output and on-resistance profile
The output type is specified as AC, DC (RF), meaning the relay can pass RF signals up to its bandwidth limit without significant insertion loss — the 12.5 Ohms max on-state resistance sets the floor for signal attenuation in the pass-through path. The 4-SSOP package (4-SMD, 0.175" body width) keeps the board footprint small — 4.45 mm body length — and the SMD (SMT) Tab termination mates with standard reflow profiles for the 4-pin land pattern.