Active production — BOM-fit for signal switching
The AQY215S: This SPST-NO (1 Form A) PhotoMOS relay switches AC or DC loads up to 250 mA across a 0 V to 100 V range, with a maximum on-state resistance of 4 Ohms — the on-resistance sets the voltage drop across the relay at a given load current, so at 250 mA the drop is 1 V, well within the load headroom for most signal-level circuits. The input is driven by a 1.25 VDC control signal, making it compatible with low-voltage logic rails (1.2 V, 1.8 V) commonly found in microcontrollers and FPGAs — no level-shifting needed at the drive side.
Package and board integration
Housed in a 4-SOP surface-mount package with gull-wing leads (4-SMD, Gull Wing), the AQY215S fits a standard SOIC-4 footprint and is supplied in tube packaging. The gull-wing termination style provides good visual solder-joint inspection access, which is helpful for manual rework or AOI in production.