{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"AQY221N2MY","brand":"Panasonic Electric Works","brandSlug":"panasonic-electric-works","productSlug":"AQY221N2MY","canonicalUrl":"https://icboms.com/panasonic-electric-works/AQY221N2MY","factsUrl":"https://icboms.com/api/mcp/products/AQY221N2MY","rawCanonicalId":null},"summary":{"shortDescription":"Panasonic Electric Works PhotoMOS™ AQY series, Signal Relay, SPST-NO (1 Form A), Surface Mount, 4-SMD (0.116\", 2.95mm), 120 mA, 40 V.","salesMarkdown":"## PhotoMOS SPST-NO signal relay, 120 mA continuous The AQY221N2MY is a PhotoMOS™ AQY series solid-state relay from Panasonic Electric Works, configured as a single-pole single-throw normally-open (SPST-NO, 1 Form A) output. It switches AC or DC (RF) loads up to 120 mA continuous across a 0 V to 40 V rail, with a maximum on-state resistance of 12.5 Ohms. Housed in a 4-SON (small-outline no-lead) package measuring 2.95 mm on the longest side, the part suits compact, low-profile PCB layouts where a mechanical relay would consume too much board area or height. ## On-resistance and load current: what limits the signal path The 12.5 Ohm max on-resistance (Ron) is the dominant term in the insertion loss for this relay. Because the output is a bidirectional MOSFET pair (AC/DC switch), Ron is symmetrical and the part blocks voltage in both polarities when off. The 40 V load voltage rating is the peak blocking voltage, not a continuous bias — the relay handles line-level audio, small-signal analog multiplexing, and low-power DC switching within that envelope. No minimum load current or wetting current requirement exists for a solid-state relay — the AQY221N2MY switches dry contacts without the oxide-piercing current a mechanical relay needs, which is the reason it is specified for RF and low-level analog paths. The 4-SON package has a 2.95 mm body width and a 0.50 mm pitch between the SMD tabs. The land pattern is the same as a standard SOT-23-5 footprint, so the relay can be placed on a common pad layout without a custom stencil. Termination style is SMD (SMT) Tab — the two output pads are larger than the input pads, which helps with thermal dissipation from the output FETs when switching near the 120 mA limit. Supplied in Tape & Reel (TR) or Cut Tape (CT) packaging; the reel quantity is not listed, but the base part number AQY221 covers the full family, so the suffix MY identifies the specific tape-and-reel variant.","metaTitle":"Panasonic AQY221N2MY PhotoMOS Relay, 120 mA, 40 V, SPST-NO","metaDescription":"Panasonic AQY221N2MY PhotoMOS relay, 120 mA load, 40 V AC/DC, 12.5 Ohm on-resistance. Active production. Sourced to order.","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":"120 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)":"12.5 Ohms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$7.0500","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null},"ai":{"faq":[{"question":"What is the on-resistance of the AQY221N2MY and why does it matter?","answer":"Maximum on-state resistance is 12.5 Ohms. This is the series resistance added to the load path when the relay is closed. For a 120 mA load, the voltage drop is 1.5 V — significant in a 3.3 V signal chain but acceptable in higher-voltage circuits. The Ron is symmetrical because the output is a bidirectional MOSFET pair."},{"question":"What compliance documentation does Panasonic provide for the AQY221N2MY?","answer":"The evidence does not list specific compliance certificates (RoHS, REACH, UL, IEC) for this order code. Standard Panasonic PhotoMOS relays are typically RoHS-compliant and halogen-free, but the buyer should confirm the exact compliance status with the supplier at RFQ time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/panasonic-electric-works/AQY221N2MY","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/AQY221N2MY 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}}