K1500S

Overview

The Littelfuse K1500S is a standard bidirectional SIDAC (Silicon Bidirectional Trigger Diode) belonging to the Kxxxzy Series. It functions as a voltage-triggered switch that conducts current once the applied voltage exceeds its breakover threshold, maintaining conduction until current drops below the holding level. Key electrical parameters include a minimum breakover voltage of 140V and a maximum of 170V, with a repetitive peak off-state voltage of 90V. The device supports an on-state RMS current of 1A at 50/60Hz and features a dynamic holding current range of 10mA to 150mA. It utilizes a DO-214 package and operates within a junction temperature range of -40°C to 125°C.

Feature Summary

• Utilizes glass-passivated junctions for ruggedness in harsh environments
• Designed specifically for AC circuit applications
• Provides reliable switching through negative resistance region

Applications

• High voltage power supplies
• Natural gas igniters
• High-pressure Sodium lamps
• Xenon flash ignition systems

Procurement Notes

Verify the specific suffix 'S' corresponds to the DO-214 package configuration required for your design. Confirm RoHS compliance status if environmental regulations apply to your manufacturing process. Ensure the selected variant matches the required trigger voltage tolerance for your circuit protection needs.

Selection Notes

Select this component when a bidirectional trigger mechanism is required for AC line voltages. The K1500S offers a breakover voltage range suitable for driving high-voltage loads such as gas discharge lamps. Consider thermal resistance limits when designing heat dissipation strategies for continuous operation near maximum ratings.

Part Context

This part belongs to the Kxxxzy Series of Standard Bidirectional SIDACs manufactured by Littelfuse. The series provides various breakover voltage options ranging from 79V to 330V across different package types including DO-15, DO-214, and TO-92. The K1500S specifically targets applications requiring a 140V to 170V triggering threshold.

Replacement Considerations

K1500G (DO-15 package), K1500E (TO-92 package). These variants share identical electrical characteristics but differ in physical footprint and mounting style.