TO-Style Test Sockets
Reliable Kelvin test sockets for TO-220, TO-247, and other transistor outline packages.
The Tooltronics TO Test Socket provides reliable electrical contact and secure mechanical support for Transistor Outline (TO) packages during testing and validation. Precision-machined components ensure accurate pin alignment and consistent contact force for repeatable results in high-cycle applications.
The socket design minimizes stress on device leads during insertion and removal while maintaining proper device orientation to reduce operator error and improve test efficiency.
Suitable for laboratory, engineering, and production environments, the TO Test Socket can be configured for various TO package styles, pin counts, and lead diameters, with custom materials and mounting options available.

Key Features
- Kelvin test socket design
- Accommodates long leads
- Long lead-in guide and support
- Customizable for various TO packages
Reliable TO-Style Test Sockets for Power Electronics Testing
Tooltronics, Inc. manufactures precision TO-style test sockets designed for reliable electrical connections and repeatable testing of transistor outline packages in engineering, validation, and production environments. Our sockets provide secure mechanical support, accurate device alignment, and dependable low-resistance electrical performance for demanding electronic test applications.
Designed to minimize stress on device leads during insertion and removal, Tooltronics TO-style sockets help improve test consistency and extend socket life in high-cycle testing environments.
Configurable for Your Application
Tooltronics TO-style test sockets can be configured for a wide range of package styles, pin counts, lead diameters, and mounting requirements. These sockets are commonly populated with LPK-100 and/or LPK-125 Kelvin contacts for accurate low-resistance measurements and reliable high-current performance.
Common Applications
Power electronics testing
Burn-in and production testing
Automated test equipment (ATE)
Aerospace and defense electronics
Features
LPK-100 and LPK-125 Kelvin contact systems
Reliable low-resistance electrical connections
Accurate device positioning and orientation
Reduced stress on device leads
Replaceable contact systems for easier maintenance
Custom package and lead configurations available
Durable construction for repeated cycling
Wide range of socket material options available
Made in USA manufacturing
Family-owned and operated since 1962
FAQ
What contact systems are available?
TO-style test sockets are commonly populated with LPK-100 and/or LPK-125 Kelvin contacts depending on the application requirements and current capacity needed.
Are custom TO-style test sockets available?
Yes. Tooltronics, Inc. specializes in custom-engineered TO-style test socket solutions designed around your specific device package and testing application.
Request a Quote
Request a quote
Discuss a custom application
Send us your device drawing
Contact engineering support
Need a Custom Solution?
Tooltronics specializes in custom engineering. Contact our team to discuss your specific testing requirements.
Contact Engineering