K2500S

Overview

The Littelfuse K2500S is a silicon bilateral voltage-triggered switch (SIDAC) from the Kxxxzy series, designed for AC circuit protection. It features a glass-passivated junction and operates within a breakover voltage range of 240V to 280V. The device has a repetitive peak off-state voltage (VDRM) of 200V and supports an on-state RMS current of 1A at 50/60Hz. Key electrical parameters include a dynamic holding current between 10mA and 150mA, a peak on-state voltage of 1.5V, and a peak non-repetitive surge current of 20A at 60Hz. It functions by switching to a low on-state voltage upon exceeding the breakover point until current drops below the holding threshold.

Feature Summary

• Silicon bilateral voltage triggered switch with negative resistance region
• Glass-passivated junctions for ruggedness in harsh environments
• RoHS compliant construction

Applications

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

Procurement Notes

Verify the specific package suffix 'S' corresponds to the DO-214 form factor required for your assembly process. Confirm that the standard circuit function '0' aligns with your design needs, as other variants like '2' exist for different configurations. Ensure the component meets RoHS compliance standards if mandated by your manufacturing regulations. Cross-reference the datasheet revision date against your production timeline to account for any potential specification updates.

Selection Notes

Select this component when a trigger voltage between 240V and 280V is required for AC circuits. Ensure the application current does not exceed the 1A RMS rating at temperatures below 125°C. Consider the thermal resistance values for proper heat dissipation planning. Verify that the operating junction temperature range of -40°C to 125°C suits the environmental conditions of the target system.

Part Context

This part belongs to the Kxxxzy Series of Standard Bidirectional SIDACs manufactured by Littelfuse Inc. These devices are engineered as solid-state switches for high-voltage applications. The series offers various voltage ratings and package options, including DO-15, DO-214, and TO-92, to accommodate different mounting and space constraints in electronic designs.

Replacement Considerations

Other parts in the Kxxxzy series with similar breakover voltages may serve as alternatives. Specifically, check the K2400S or K2502G for comparable performance characteristics. Verify that substitute components match the required VDRM and ITRM specifications to ensure circuit compatibility.