TDA Ultra-Miniature Half-Pitch DIP Switches C&K Switches TDA Ultra-Miniature Half-Pitch DIP Switches feature bifurcated contacts for increased electrical reliability. These switches are process sealed for surface-mount soldering and washable processing. The TDA series provides a mechanical and electrical life of 1000 cycles, 100mΩ maximum contact resistance, and an operating temperature range of -40°C to +85°C. C&K Switches TDA Ultra-Miniature Half-Pitch DIP Switches are ideally suited for handheld electronic devices, portable computer devices, and instrumentations and controls.