K2000EH70

Overview

The Littelfuse K2000EH70 is a high-voltage trigger diode, classified as a Sidac device within the Kxxxzy series. It features a bidirectional breakdown characteristic with a breakover voltage (VBO) ranging from 205 V to 230 V and a maximum breakover current (IBO) of 10 uA. The component supports a non-repetitive on-state current of 16.7 A or 20 A and has a rated repetitive off-state voltage (VDRM) of 180 V. With an on-state RMS current rating of 1 A and a holding current (Ih) maximum of 150 mA, it operates in a temperature range of -40 C to +85 C. The device is housed in a TO-92 through-hole package.

Feature Summary

• Bidirectional high-energy triggering capability for AC circuit protection
• Glass-passivated junction construction for parameter stability
• Integrated trigger diode function eliminating discrete assembly requirements

Applications

• Triggering gates for silicon-controlled rectifiers (SCRs)
• Phase control circuits for lighting dimmers
• Temperature modulation controls

Procurement Notes

Verify the specific suffix EH70 against the manufacturer's latest datasheet to confirm pinout orientation and packaging format. Ensure the ordering documentation explicitly lists the Littelfuse part number K2000EH70 to avoid confusion with similar series variants that may have different electrical tolerances or thermal characteristics.

Selection Notes

Select this component when a bidirectional trigger source is required for SCR or triac gate drive applications. The 205 V to 230 V breakover range suits standard mains voltage phase control designs. Verify that the 1 A RMS current rating meets the gate drive requirements of the downstream switching device without exceeding the thermal limits of the TO-92 package.

Part Context

This device belongs to the Kxxxzy series of high-voltage trigger diodes manufactured by Littelfuse. These components are designed to replace discrete diac assemblies, offering a compact solution for AC switching applications. The series provides reliable turn-on characteristics for controlling power semiconductor devices in consumer and industrial electronics.

Replacement Considerations

Consult the Littelfuse K-series cross-reference guide for verified substitutes. Generic diacs may not match the specific 205 V to 230 V breakover tolerance or the 16.7 A/20 A peak current handling capabilities documented for this model.