K1800S1URP

Overview

The Littelfuse K1800S1URP is a high-voltage trigger diode, classified as a SIDAC within the thyristor family. It operates in the DO-214 (SMB) surface-mount package and supports SMD/SMT installation. Key electrical parameters include a breakover voltage (VBO) of 183 V and a maximum breakover current (IBO) of 10 uA. The device features a rated repetitive off-state voltage (VDRM) of 150 V with a leakage current of 5 uA at this voltage. It handles an RMS on-state current (It RMS) of 1 A and a non-repetitive on-state peak current of 20 A. The holding current (Ih) maximum is 80 mA, with an on-state voltage of 1.2 V. Operating temperatures range from -40 C to +125 C.

Feature Summary

• Provides bidirectional overvoltage protection through symmetrical switching characteristics.

Applications

• Surge protection circuits for electronic equipment.

Procurement Notes

Verify component authenticity by checking manufacturer markings against official datasheets. Confirm package integrity and pin alignment prior to assembly. Ensure storage conditions maintain moisture sensitivity levels according to handling guidelines. Validate that the specific suffix matches design requirements without assuming functional changes based solely on packaging variations.

Selection Notes

Select this component when designing circuits requiring precise high-voltage triggering thresholds around 183 V. Consider the DO-214 footprint constraints and thermal management capabilities for continuous 1 A RMS operation. Evaluate the -40 C to +125 C operating range against environmental demands. Compare VDRM ratings to ensure adequate margin below normal circuit operating voltages to prevent unintended triggering.

Part Context

This part belongs to the Littelfuse SIDAC series, specifically designed for transient voltage suppression. It functions as a bidirectional trigger diode offering robust protection against voltage spikes. The device integrates into protection stages where reliable breakdown characteristics are critical for safeguarding downstream sensitive components from electrical overstress events.

Replacement Considerations

Public confirmed substitute part numbers are not available in verified documentation.