SK025L

Overview

The SK025L is a silicon-controlled rectifier (SCR) from the Littelfuse Teccor Sxx25x series, designed for high-voltage AC switching applications. It features a 1000V repetitive peak off-state voltage and a 25A on-state RMS current rating. The device utilizes a TO-220-2 package with an electrically isolated mounting tab. Key electrical characteristics include a maximum gate trigger current of 35mA and a holding current of 40mA. The component exhibits a typical on-state voltage drop of 1.6V at rated current and supports a non-repetitive surge current of 250A. It operates within a junction temperature range of -40°C to +125°C.

Feature Summary

• Integrated glass-passivated junctions ensure long-term parameter stability and durability against environmental stress.
• Electrically isolated mounting tab eliminates the need for external insulators in high-voltage installations.
• Sensitive gate structure allows direct interfacing with standard logic circuits or microprocessors.

Applications

• Solid-state relays and contactors
• Industrial motor speed controls
• Lighting dimmer circuits

Procurement Notes

Verify the specific suffix configuration when ordering, as Littelfuse part numbers often include thermal compound or lead-free processing indicators that do not alter electrical function but affect compliance documentation. Confirm RoHS status via the official datasheet before integration into regulated assemblies.

Selection Notes

Select this SCR for applications requiring robust 1000V blocking capability with moderate current handling. Ensure the circuit design accounts for the specified dv/dt rating to prevent false triggering. Verify that the heat sinking solution maintains the junction temperature below the 125°C maximum limit under continuous load conditions.

Part Context

This component belongs to the Teccor Sxx25x family of discrete SCRs manufactured by Littelfuse. These devices are engineered for general-purpose AC power control, offering a balance of high voltage tolerance and reliable switching performance in industrial and consumer electronics environments.

Replacement Considerations

Direct replacements must match the 1000V/25A rating and TO-220-2 package. Check equivalent parts from other manufacturers for compatible gate trigger currents and thermal resistance values to ensure seamless circuit substitution without redesign.