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Panasonic Electric Works AQY221N2M — Signal Relays

Panasonic AQY221N2M PhotoMOS Relay, 120 mA, 40 V, SPST-NO

MPNAQY221N2M
Obsolete

Panasonic Electric Works PhotoMOS™ AQY series, SPST-NO (1 Form A) solid-state relay, 120 mA load current, 0 V ~ 40 V load voltage, 12.5 Ohms on-resistance, 4-SMD (0.116", 2.95mm) surface mount, 4-SON package.

$7.8200Ref. price · indicative, final on quote
Panasonic Electric Works AQY221N2M datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

AQY221N2M 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)
PackageStrip
Case4-SMD (0.116\", 2.95mm)
Termination styleSMD (SMT) Tab
On-State resistance12.5 Ohms

Product details

PhotoMOS relay for RF and low-level signal switching

The Panasonic AQY221N2M is a solid-state relay from the PhotoMOS AQY series, designed for switching AC or DC signals, including RF paths, in instrumentation and telecom boards. Rated for 120 mA continuous load current at up to 40 V, with a maximum on-state resistance of 12.5 Ohms — the resistance figure matters for signal attenuation in low-level analog paths, where a 12.5 Ohm series element adds a voltage divider with the downstream input impedance.

Package and board-fit for the 4-SON footprint

Housed in a 4-SON package (4-SMD, 0.116" x 0.116", 2.95 mm body), the AQY221N2M mounts on a standard surface-mount land pattern — the small footprint suits dense mixed-signal boards where relay height and board area are constrained. The SMD (SMT) Tab termination style means the load-side pads carry the signal current; the thermal path through the tab is minimal at 120 mA, so no special copper spreading is needed for this load level.

Frequently asked questions

What is the on-state resistance of the AQY221N2M and why does it matter?

The maximum on-state resistance is 12.5 Ohms. For a 120 mA load, this adds a 1.5 V drop across the relay at full current — acceptable for 40 V load circuits, but significant for low-voltage analog signals where the series resistance forms a voltage divider with the load impedance.

What package does the AQY221N2M use?

It comes in a 4-SON surface-mount package (4-SMD, 0.116" body width, 2.95 mm square). The termination style is SMD (SMT) Tab, compatible with standard reflow soldering profiles for small-outline no-lead packages.

Can I drive the AQY221N2M input from a 1.8 V logic GPIO?

Yes — the specified input voltage is 1.14 VDC, so a 1.8 V logic high provides sufficient margin above the threshold. No external level-shifting resistor is needed, but the input current drawn at 1.8 V should be within the GPIO source capability (typically 4-8 mA for most MCUs).