K1400G

Overview

The Littelfuse K1400G is a silicon bilateral voltage triggered switch (SIDAC) from the Kxxxzy series. It features glass-passivated junctions for ruggedness and operates as an AC circuit-oriented device. The component switches on when applied voltage exceeds its breakover point, conducting until current drops below the holding threshold. Key electrical parameters include a breakover voltage range of 130V to 146V, a repetitive peak off-state voltage of 90V, and an on-state RMS current rating of 1A at 50/60Hz. It utilizes a DO-15 package with a thermal resistance of 75°C/W junction-to-ambient.

Feature Summary

• Silicon bilateral voltage triggered switch with negative resistance region switching characteristics
• Glass-passivated junctions ensure reliability in harsh environments
• RoHS compliant construction

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm the exact package type and marking code. Confirm RoHS compliance status and environmental test results such as MIL-STD-750 requirements if applicable to the design. Ensure the selected variant matches the required lead form dimensions for the intended PCB layout or assembly process.

Selection Notes

Select based on the required breakover voltage range between 130V and 146V. Consider the maximum allowable case temperature versus RMS on-state current derating curves for thermal management. Verify that the repetitive peak off-state voltage of 90V is sufficient for the blocking requirements of the circuit application.

Part Context

The K1400G belongs to the Kxxxzy Standard Bidirectional SIDACs family manufactured by Littelfuse. This series includes various voltage ratings and package options including DO-15, DO-214, and TO-92. These components are designed for AC switching and phase control applications requiring noise immunity and reliable triggering.

Replacement Considerations

Other parts within the Kxxxzy series may serve as substitutes if their breakover voltage ranges overlap with the 130V to 146V requirement. Ensure the replacement part shares the same package type and electrical characteristics such as holding current and surge capability.