K1400S

Overview

The Littelfuse K1400S is a standard bidirectional SIDAC (Silicon Bidirectional Trigger Diode) belonging to the Kxxxzy series. It functions as a voltage-triggered switch, remaining in a high-impedance state until the applied voltage exceeds its breakover threshold, at which point it switches to a low on-state voltage. The device features glass-passivated junctions for ruggedness and is RoHS compliant. Key electrical parameters include a breakover voltage range of 130V to 146V, a repetitive peak off-state voltage of 90V, an on-state RMS current of 1A, and a dynamic holding current between 10mA and 150mA. It operates within a junction temperature range of -40°C to 125°C.

Feature Summary

• Bidirectional switching capability suitable for AC circuit applications
• Glass-passivated junction construction for environmental durability
• RoHS compliant manufacturing process

Applications

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

Procurement Notes

Verify the specific package type and marking code against the official Littelfuse datasheet before ordering. Confirm that the required breakover voltage tolerance aligns with the 130V to 146V specification range. Ensure the application environment stays within the specified thermal limits to maintain component reliability and performance standards.

Selection Notes

Select this component when a precise bilateral trigger voltage near 140V is required for AC circuits. Consider the DO-214 surface mount package for space-constrained PCB layouts. Evaluate the 1A RMS current rating against the load requirements to ensure adequate surge handling capabilities during operation.

Part Context

This part belongs to the Kxxxzy Series of Standard Bidirectional SIDACs from Littelfuse. The series offers various breakover voltages ranging from 79V to 330V across different package options including DO-15, DO-214, and TO-92. These devices are designed for robust overvoltage triggering in industrial and consumer electronics.

Replacement Considerations

Compatible substitutes within the same family include K1400G (DO-15 package) and K1400E (TO-92 package). Verify pinout compatibility and thermal resistance differences when transitioning between package types.