QFN, DFN & Leadless Test Sockets
Precision contact for the smallest devices. Down to 0.2mm pitch. Testing leadless packages like QFN, DFN, and WLCSP presents a unique challenge: with no leads to align to, mechanical accuracy is everything. Our QFN & Leadless test sockets utilize precision-machined floating guides and high-aspect-ratio probes to guarantee contact on pads as small as 0.15mm. Whether you are testing high-frequency RF Front-End modules or power-dense PMICs, we eliminate the “false failures” caused by misalignment.
QFN, WLCSP & LEADLESS CONFIGURATIONS
Testing leadless packages requires more than just a spring probe—it demands micro-precision alignment. Our QFN and WLCSP socket architectures utilize floating guide plates and self-cleaning crown probes to ensure reliable contact on pads as small as 0.2mm. Browse our primary Leadless configurations below to find the ideal match for your Mobile, IoT, or RF application.
| Package Configuration | Min Pitch | Device Types | Key Feature | Best For Applications |
|---|---|---|---|---|
| QFN / DFN / MLF | 0.35 mm | Standard Leadless | Side-Wall Alignment | Microcontrollers, Sensors, WiFi Modules |
| WLCSP (Wafer Level) | 0.20 mm | Direct Die Attach | Crown Tip Probes | Mobile Processors, Audio Codecs, Wearables |
| RF / 5G QFN | 0.40 mm | RF Front End (RFFE) | Short Signal Path | PA, LNA, Switch Modules (Sub-6 GHz) |
| Kelvin QFN | 0.40 mm | High Power Density | Force/Sense Isolator | Battery Management, PMIC, DC-DC Converters |
Overview
KEY FEATURES OF OUR LEADLESS SOCKETS
- Micro-Alignment Guides: We use CNC-machined Torlon/PEEK floating bases with tolerances of ±10 microns to align devices strictly by their package body, ensuring probes hit the center of the pad every time.
- Debris-Resistant Probes: Leadless packages (especially Matte Tin) generate significant debris. We utilize self-cleaning “Crown” or “Sharp” plunger tips that pierce through oxides and flux residue to maintain low resistance.
- 0.2mm Pitch Capability: Our ultra-fine pitch spring probes allow for full functional testing of WLCSP and high-density logic devices that standard pogo pins cannot touch.
- RF-Ready Designs: Many QFNs are used in wireless. Our sockets minimize inductance with short signal paths, supporting bandwidths up to 40 GHz for 5G and WiFi 6E applications.
- Damage-Free Actuation: Our lids apply strictly vertical compression, preventing the “sliding” that scratches pads or cracks fragile bare-die WLCSP corners.
VERIFIED PERFORMANCE & RAPID DELIVERY
Micro-Machining
±10 Micron Accuracy
When pads are only 0.2mm wide, there is no room for error. We machine our socket bodies in-house with ultra-precision CNCs to guarantee perfect alignment.
Made in USA & Singapore
Global Engineering Support
With design and manufacturing in MA and a support hub in Singapore, we support both US design teams and Asian OSAT production floors.
Reliable Delivery
Optimized Supply Chain
We manage logistics locally to minimize bottlenecks. Custom fine-pitch fixtures are typically deliverable in 6-7 weeks.
GET A FAST & ACCURATE QUOTE
To speed up your socket alignment check and quote process, please have the following ready:
- Device Package Drawing (POD): PDF/DXF (Must show pad dimensions clearly).
- Pad Plating Material: e.g., NiPdAu (Gold) or Matte Tin? (Crucial for selecting the right probe tip to avoid cleaning issues).
- Application: RF, Power (Kelvin), or Digital?
- Lid Type: Clamshell (Hand Test) or Open Top?
How often do I need to clean the socket?
For leadless parts (especially with Matte Tin plating), we recommend cleaning every 2,000–5,000 cycles. We offer easy-access designs that allow cleaning without dismounting the socket from the board.
Can you handle WLCSP (Wafer Level Packages)?
Yes. We specialize in “soft-touch” lids and probe tips designed specifically for bare silicon WLCSP devices to prevent chipping the die edges.
Do you support Kelvin testing for 0.4mm pitch QFNs?
Yes. We use proprietary “Double-Pin” or “Blade” probe architectures to achieve true 4-wire Kelvin measurement on standard 0.4mm and even 0.35mm pitch pads.