PhotoMOS AQY — RF-rated solid-state relay for signal switching
The AQY221N2M1Y is an SPST-NO (1 Form A) solid-state relay from Panasonic's PhotoMOS AQY series, designed for switching AC or DC signals up to 120 mA and 40 V. Its 12.5 Ohm max on-state resistance keeps insertion loss low in RF and instrumentation paths.
Load ratings and on-resistance — what they mean for signal integrity
Rated for 120 mA continuous load current at 0 to 40 V across the output terminals, this relay handles low-power analog and digital signals without the mechanical bounce of an electromechanical part. The 12.5 Ohm max on-state resistance is the series resistance the signal sees when the relay is closed — for a 50-Ohm RF line, that adds about 0.5 dB of insertion loss, which is acceptable for many test and measurement paths. The 4-SON package (2.95 mm body width) suits dense PCB layouts where board space is at a premium.