K1200S

Overview

The Littelfuse K1200S is a standard bidirectional SIDAC (Silicon Bidirectional Trigger Diode) designed for AC circuit applications. It features a silicon bilateral voltage-triggered switch with glass-passivated junctions for ruggedness. Key electrical parameters include a breakover/trigger voltage range of 110V to 125V and a repetitive peak off-state voltage of 90V. The device supports an on-state RMS current of 1A at 50/60Hz, with a dynamic holding current between 10mA and 150mA. It handles a peak non-repetitive surge current of 20A (single cycle, 60Hz) and has a critical rate of rise of on-state current of 150 A/μs. The component operates within a junction temperature range of -40°C to 125°C and is available in the DO-214 surface-mount package.

Feature Summary

• Bidirectional voltage triggering capability for AC circuits
• Glass-passivated junction technology for environmental reliability
• High surge current handling capacity

Applications

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

Procurement Notes

Verify the specific suffix 'S' corresponds to the DO-214 package configuration when ordering. Confirm RoHS compliance status as per the latest manufacturer documentation. Ensure storage conditions remain within the specified temperature range to maintain junction integrity prior to assembly.

Selection Notes

Select the K1200S variant when a breakover voltage between 110V and 125V is required for the target application. Consider the DO-214 package for surface-mount designs requiring compact footprint. Evaluate thermal resistance and RMS current limits against the expected load conditions to ensure safe operation within the 125°C junction temperature maximum.

Part Context

The K1200S belongs to the Littelfuse Kxxxzy Series of Standard Bidirectional SIDACs. This series utilizes silicon bilateral voltage-triggered switches characterized by negative resistance regions upon activation. The family offers various breakover voltages from 79V to 330V across different packages including DO-15, TO-92, and DO-214, providing options for diverse high-voltage switching requirements.

Replacement Considerations

Cross-reference with other K1200 variants such as K1200G (DO-15) or K1200E (TO-92) if package compatibility differs. Verify that substitute components match the 110V-125V breakover voltage range and 1A RMS current rating to maintain circuit performance.