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Panasonic Electric Works AQY221N2SZ — Signal Relays

Panasonic AQY221N2SZ PhotoMOS Relay, SPST-NO, 120 mA, 4-SOP

MPNAQY221N2SZ
Active

Panasonic Electric Works PhotoMOS™ AQY series, Signal Relay, SPST-NO (1 Form A), Surface Mount, 120 mA, 40 V, 4-SOP package, AQY221N2SZ.

$6.1600Ref. price · indicative, final on quote
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

AQY221N2SZ specifications
ParameterValue
SeriesPhotoMOS™ AQY
Output typeAC, DC (RF)
MountingSurface Mount
Voltage - load0 V ~ 40 V
Voltage - input1.14VDC
Load current120 mA
CircuitSPST-NO (1 Form A)
PackageTape & Reel (TR) Cut Tape (CT)
Case4-SOP (0.173\", 4.40mm)
Termination styleGull Wing
On-State resistance12.5 Ohms

Product details

120 mA, 40 V PhotoMOS in a 4-SOP package

The AQY221N2SZ 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 at up to 40 V, with a maximum on-state resistance of 12.5 Ohms. For precision analog multiplexing or low-level signal routing, budget this drop into the signal chain headroom. The LED input side is optically isolated from the MOSFET output, providing galvanic isolation between the control and load circuits.

SOP package and board-level integration

The relay is available in Tape & Reel (TR) and Cut Tape (CT) packaging options. The TR variant is the standard for automated pick-and-place assembly; CT is useful for prototyping or low-volume builds where a full reel commitment is not justified.

Active lifecycle and sourcing posture

As an active part with a single qualified source (Panasonic), the AQY221N2SZ carries no direct pin-compatible second source from another manufacturer. For BOM resilience, qualify the alternate Panasonic PhotoMOS order codes in the same 4-SOP package and SPST-NO configuration — the AQY221 series shares the same footprint and drive voltage, differing mainly in load current and on-resistance.

Frequently asked questions

What is the closest pin-compatible alternative to the AQY221N2SZ in the PhotoMOS family?

Within the same AQY221 series, other SPST-NO relays in the 4-SOP package share the same pinout and 1.14 V input drive. The primary differentiators are load current rating and on-state resistance — for example, variants with lower on-resistance typically support higher load currents. Confirm the specific load current and on-resistance requirements against the alternative order code before substituting.

What is the on-state resistance of the AQY221N2SZ and why does it matter?

The maximum on-state resistance is 12.5 Ohms. This resistance creates a voltage drop across the relay proportional to the load current (1.5 V at 120 mA). For low-voltage signal switching or RF applications, this drop must be accounted for in the signal chain budget, as it reduces the voltage available to the load and can affect signal amplitude.