SK655KDTP

Overview

The Littelfuse SK655KDTP is a standard phase control Silicon Controlled Rectifier (SCR) rated for 1600 V repetitive peak off-state voltage and 55 A RMS on-state current. It utilizes an electrically isolated KD package (TO-218AC) recognized by UL for 2500 VRMS isolation. The device features low gate trigger requirements of 70 mA maximum and 1.5 V maximum, facilitating easy drive circuitry. Key electrical characteristics include a maximum forward voltage of 1.8 V at 110 A, a holding current of 200 mA maximum, and a critical rate of rise of on-state current (di/dt) of 150 A/µs. Thermal resistance from junction to case is 1.0 °C/W.

Feature Summary

• Electrically isolated TO-218AC mounting tab with center lead common with cathode
• RoHS compliant construction suitable for industrial power applications
• Low gate sensitivity enabling efficient triggering with minimal drive power

Applications

• AC solid-state switches
• Industrial power tools
• Line rectification at 50/60 Hz
• Heating controls
• Motor speed controls

Procurement Notes

Verify the specific ordering suffix 'TP' confirms tube packaging containing 30 units per base before procurement. Confirm that the component status remains active or acceptable for new designs, as discontinuation notices may apply to legacy thyristor series. Ensure the requested quantity aligns with the manufacturer's standard packing mode to avoid partial tube handling issues during assembly.

Selection Notes

Select this component when high voltage blocking capability up to 1600 V is required alongside moderate current handling. The isolated package design simplifies thermal management and electrical safety in grounded chassis environments. Verify that the application's surge currents remain within the specified ITSM limits for single half-cycle events at 50 Hz or 60 Hz frequencies.

Part Context

This part belongs to the SK655KD series of 55 Amp Standard SCRs manufactured by Littelfuse under the Teccor brand. The series is designed for robust phase control applications requiring reliable switching performance. The specific model integrates standard SCR functionality within a thermally efficient and electrically isolated housing format.

Replacement Considerations

Direct substitutes must match the 1600 V rating, 55 A current capacity, and TO-218AC isolated package dimensions. Verify equivalent gate trigger specifications and thermal resistance values to ensure compatibility with existing heat sinking and drive circuits without redesigning the PCB layout.