Test sockets

QFN test sockets by pin count, body size and pitch

QFN packages have no leads outside the body and an exposed thermal pad underneath, so a QFN socket must match the body size, the pad layout and the pitch exactly. Pin count alone is not enough: a QFN48 can be 6 × 6 mm at 0.4 mm pitch or 7 × 7 mm at 0.5 mm pitch.

Use the table to match your device to a Plastronics QN-series socket, then confirm against your package drawing.

Request a QFN socket quote

QFN socket lookup

Plastronics (Smiths Interconnect) QN-series sockets available through MST
Package	Body size	Pitch	Part number	Store page
QFN16	3 × 3 mm	0.5 mm	16QN50S23030	SKT-QFN16-3X3
QFN24	4 × 4 mm	0.5 mm	24QN50S14040	SKT-QFN24-4X4
QFN32	5 × 5 mm	0.5 mm	32QN50S15050	SKT-QFN32-5X5
QFN48	6 × 6 mm	0.4 mm	48QN40TS16060	SKT-QFN48-6X6
QFN48	7 × 7 mm	0.5 mm	48QN50S17070	SKT-QFN48-7X7
QFN64	9 × 9 mm	0.5 mm	64QN50S19090	SKT-QFN64-9X9

All six are lidded clamshell sockets with spring-probe contacts.

QN-series range

Pitches: 0.40, 0.50, 0.65, 0.80 and 1.00 mm; custom pitches down to 0.35 mm.
Lidded and open-top sockets for packages up to 10 mm; lidded sockets for 10 mm to 16 mm.
Center ground pin standard on all sockets; optional copper heat slug for high-power devices.
Sockets for more than 80 JEDEC standard footprints.

Checks before you order

Match the body size and pitch from the device drawing, not just the pin count.
Check the exposed pad size against the socket ground contact.
Confirm whether you need a lidded or open-top socket for your loading method.
For burn-in, confirm the temperature rating and expected insertion life.

Frequently asked questions

Is there a QFN32 5x5 test socket?

Yes. The Plastronics 32QN50S15050 is a lidded QFN32 socket for a 5 × 5 mm body at 0.5 mm pitch, listed on MST Store as SKT-QFN32-5X5.

Which QFN48 socket do I need?

It depends on the body. Use 48QN40TS16060 for a 6 × 6 mm body at 0.4 mm pitch, or 48QN50S17070 for a 7 × 7 mm body at 0.5 mm pitch.

Do QFN sockets contact the exposed thermal pad?

Smiths Interconnect lists a center ground pin as standard on QN-series sockets, and an optional copper heat slug for high-wattage devices.

My QFN size is not in the table. Can you still source it?

Yes. Send the package drawing and MST will check the matching QN-series or open-top socket with the manufacturer.

Quote a QFN socket

Tell us the package, body size, pitch and quantity. MST confirms the socket part number with the manufacturer and replies with price and lead time.