K1050S

Overview

The Littelfuse K1050S is a standard bidirectional SIDAC (Silicon Bidirectional Trigger Device) belonging to the Kxxxzy series. It functions as a silicon voltage-triggered switch designed for AC circuit applications. The device features a breakover voltage range of 95 V to 113 V and a repetitive peak off-state voltage of 90 V. It supports an on-state RMS current of 1 A at 50/60 Hz with a junction temperature below 125°C. The component utilizes a DO-214 surface-mount package, operates within a junction temperature range of -40°C to 125°C, and includes glass-passivated junctions for environmental ruggedness.

Feature Summary

• Bilateral switching capability allowing operation in both voltage polarities
• Glass-passivated junction construction for enhanced durability
• Low on-state voltage characteristic for efficient conduction

Applications

• High-voltage power supplies
• Natural gas ignition systems
• High-pressure Sodium lamp firing circuits
• Xenon flash ignition circuits

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm the package type and packaging configuration. The 'S' suffix indicates the DO-214 surface-mount package. Ensure that the required quantity matches the available base packing options, such as reel packs, to align with assembly requirements. Confirm RoHS compliance status through the latest product documentation before finalizing procurement orders.

Selection Notes

Select the K1050S when a breakover voltage between 95 V and 113 V is required for triggering applications. Ensure the circuit design accommodates the 90 V repetitive peak off-state voltage limit. Verify that the expected RMS current does not exceed 1 A under the intended operating junction temperature conditions. Consider the DO-214 package dimensions for PCB layout constraints and thermal management requirements relative to other available packages like DO-15 or TO-92.

Part Context

The K1050S is part of the Kxxxzy series of standard bidirectional SIDACs manufactured by Littelfuse. This series provides various breakover voltage ratings from 79 V to 330 V across different package styles including DO-15, DO-214, and TO-92. The K1050 variant specifically targets applications requiring a nominal 105 V trigger level, offering a robust solution for high-voltage triggering tasks in industrial and consumer electronics.

Replacement Considerations

Other members of the Kxxxzy series, such as K1050G (DO-15) or K1050E (TO-92), offer identical electrical characteristics but differ in physical package and mounting style. Direct pin-to-pin replacement is not possible due to package differences; PCB redesign may be necessary.