{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AQY221R2M1Y","brand":"Panasonic Electric Works","brandSlug":"panasonic-electric-works","productSlug":"AQY221R2M1Y","canonicalUrl":"https://icboms.com/panasonic-electric-works/AQY221R2M1Y","factsUrl":"https://icboms.com/api/mcp/products/AQY221R2M1Y","rawCanonicalId":null},"summary":{"shortDescription":"Panasonic Electric Works, PhotoMOS AQY series, SPST-NO solid-state signal relay, AQY221R2M1Y, 250 mA load, 1.25 Ohm max on-resistance, 0–40 V load, 1.14 V input, surface-mount 4-SON package.","salesMarkdown":"## What PhotoMOS solid-state architecture means for signal switching The AQY221R2M1Y is a PhotoMOS solid-state relay — it uses an LED-phototransistor optocoupler pair to switch the load, with no moving contacts. That eliminates contact bounce, contact welding, and mechanical wearout mechanisms that govern mechanical relay lifecycle. For a BOM line carrying a signal-level switching function — a mux gate drive, a bus isolate, a sensor excitation toggle — the solid-state path trades the near-zero on-resistance of a mechanical relay contact for guaranteed silent switching and a footprint that stays consistent across temperature and vibration. ## Load ratings — what 250 mA and 40 V mean for signal vs power switching 250 mA maximum load current puts this squarely in the signal-relay class — it comfortably drives LED logic inputs, comparator thresholds, and low-current solenoid coils, but it is not a power-path contact. The on-state resistance ceiling of 1.25 Ohm means the voltage drop at 250 mA sits around 300 mV — that matters when the downstream input is a low-impedance comparator or a sensitive ADC channel where offset error from relay IR drop affects the measurement. The load voltage window is 0 to 40 V — wide enough for 24 V industrial control signals and 12 V automotive rails, but the 250 mA ceiling restricts it to signal-level loads within those rails. The output type is listed as AC, DC (RF), which confirms the PhotoMOS output stage handles both polarities without a commutation diode — useful in AC signal path switching. ## Input threshold — driving the relay from low-voltage logic The LED inside the optocoupler pair fires at that threshold; below it the output stays open-circuit. Confirm the GPIO drive current against the LED forward current requirement in the full datasheet before committing the BOM line. ## 4-SON surface-mount package — board-density and pick-place realities The AQY221R2M1Y ships in a 4-SMD (0.116 inch, 2.95 mm) package with a 4-SON supplier device footprint. The 2.95 mm body width is compact — it fits a dense analog front-end board where multiple signal relays sit side-by-side in a mux or bus-isolate configuration. The surface-mount termination is a tab-style SMD — confirm the pad layout and coplanarity spec against the manufacturer landing pattern before the pick-place program is locked; the exposed pad underneath the SON package must be soldered reliably or the thermal path is broken and the relay lifetime is affected.","metaTitle":"Panasonic AQY221R2M1Y PhotoMOS Relay, 250 mA, 4-SON","metaDescription":"Panasonic Electric Works AQY221R2M1Y PhotoMOS signal relay, SPST-NO, 250 mA load, 1.25 Ohm on-resistance, 40 V load, surface-mount 4-SON.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Signal Relays"],"specifications":{"Mfr":"Panasonic Electric Works","Series":"PhotoMOS™ AQY","Circuit":"SPST-NO (1 Form A)","Package":"Tape & Reel (TR) Cut Tape (CT)","Output Type":"AC, DC (RF)","Load Current":"250 mA","Mounting Type":"Surface Mount","Package / Case":"4-SMD (0.116\\\", 2.95mm)","Product Status":"Active","Voltage - Load":"0 V ~ 40 V","Voltage - Input":"1.14VDC","lifecycle_stage":"unknown","Termination Style":"SMD (SMT) Tab","Base Product Number":"AQY221","Supplier Device Package":"4-SON","On-State Resistance (Max)":"1.25 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$8.6300","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/panasonic-electric-works/AQY221R2M1Y","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/panasonic-electric-works/AQY221R2M1Y when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}