Littelfuse's Kxxx0S1URP and Kxxx0GURP series unidirectional SIDAC switching thyristors are designed for use in conjunction with a capacitor and a transformer in capacitor discharge ignition (CDI) circuits for generating high voltage spikes. They offer lower switching losses than existing high-energy SIDAC and standard SIDAC products. The SIDAC design provides a higher repetitive pulse current (I_TRM) rating at higher ambient temperatures, improved breakover/trigger voltage vs. temperature characteristics, and lower switching loss. This allows existing circuits to support higher voltage outputs, and ensures stable voltage outputs at high ambient temperatures. Typical applications include high-power flame ignition modules designed for gas cooking appliances ranging from portable, tabletop types to commercial-grade multiple-burner models, gas water heaters and oil heaters of all sizes, and ion generators.

Features and Benefits

• Lower switching loss (V_T) than existing SIDAC series while keeping high 280 A pulse capability
• Improved break over/trigger voltage (V_BO) vs. temperature characteristics
• Achieved high T_J of 150˚C (for part numbers K2200, K2300, K2400, and K2500)
• Lower I_BO/faster switching than existing Kxxx0SHURP/GHURP series
• Allows generating longer high-voltage pulses or generating multiple outputs by supporting higher discharge current
• No degradation of pulse voltage at high ambient temperatures
• Longer field life/high reliability in high ambient temperatures common in gas ignition modules of cooktops and water heaters/boilers
• Higher di/dt in discharge current pulse, resulting in higher voltage output