K2500EH70

Overview

The Littelfuse K2500EH70 is a high-voltage trigger diode, classified as a SIDAC within the thyristor family. It operates in the TO-92 (TO-226AC) through-hole package and features a bidirectional switching characteristic with a breakdown voltage range of 240 V to 280 V. The device supports a maximum repetitive off-state voltage of 200 V and maintains a low leakage current of 5 µA under rated conditions. It handles a continuous RMS on-state current of 1 A and non-repetitive peak currents up to 20 A. The component functions reliably across an operating temperature range from -40°C to +125°C junction temperature.

Feature Summary

• Bidirectional high-voltage triggering capability for symmetric circuit protection
• Robust surge handling with high non-repetitive peak current tolerance
• Low holding current ensures stable latching behavior in trigger applications

Applications

• Gas discharge tube triggering circuits
• Surge protective devices for telecommunications lines
• Overvoltage protection modules requiring precise breakdown thresholds

Procurement Notes

Verify the specific suffix EH70 against the manufacturer's official datasheet to confirm pinout orientation and marking codes. Ensure the procurement channel provides the original Littelfuse documentation rather than third-party summaries. Confirm RoHS3 compliance status directly from the latest production notice before finalizing orders.

Selection Notes

Select this component when a symmetrical high-voltage trigger is required for activating gas tubes or similar protection elements. The TO-92 package suits space-constrained through-hole designs. Verify that the system's expected surge currents remain within the 20 A non-repetitive limit to prevent device failure during transient events.

Part Context

This part belongs to the Kxxxzy series of SIDACs manufactured by Littelfuse. These devices are engineered specifically for triggering applications where reliable, repeatable breakdown at high voltages is critical. The series offers various voltage ratings and packages to accommodate different industrial and consumer protection standards.

Replacement Considerations

Cross-reference with other Littelfuse SIDACs in the same voltage bracket if supply constraints exist. Ensure any substitute matches the 240-280 V breakdown range and TO-92 footprint. Verify thermal characteristics and holding current specifications align with the original design requirements.