K2200EH70

Overview

The Littelfuse K2200EH70 is a high-voltage trigger diode, classified as a Sidac within the Kxxxzy series. It operates in through-hole TO-92 packaging and is designed for high-energy switching applications. The device features a breakover voltage (VBO) range of 205 V to 230 V with a maximum breakover current (IBO) of 10 uA. It 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. The component maintains an on-state leakage current of 5 uA at VDRM and a holding current (Ih) maximum of 150 mA. With an on-state voltage of 1.5 V and an RMS current rating of 1 A, it functions reliably across a temperature range from -40 C to +85 C.

Feature Summary

• High-energy switching capability for robust circuit protection
• Bidirectional AC switching functionality without external isolation requirements
• Glass-passivated junctions for long-term parameter stability

Applications

• Triggering circuits for silicon-controlled rectifiers (SCRs)
• Phase control applications requiring noise immunity
• Overvoltage protection in AC power systems

Procurement Notes

Verify the specific suffix EH70 against the official Littelfuse datasheet to confirm package type and tape/reel specifications. Ensure the ordering quantity matches the manufacturer's standard factory pack size. Confirm RoHS compliance status directly from the latest product documentation before finalizing procurement orders.

Selection Notes

Select this component when a bidirectional trigger device with a breakover voltage between 205 V and 230 V is required. Ensure the circuit can handle the specified non-repetitive peak current of up to 20 A. Verify that the operating environment remains within the -40 C to +85 C temperature range and that the TO-92 through-hole package fits the PCB layout constraints.

Part Context

The K2200EH70 belongs to the Kxxxzy series of high-voltage trigger diodes manufactured by Littelfuse. These devices are distinct from standard thyristors as they function primarily as voltage-triggered switches. The series is engineered for reliability in AC phase control and triggering applications, offering a compact alternative to discrete diac-triac combinations.

Replacement Considerations

Consult the Littelfuse K-series cross-reference guide for verified substitutes. Ensure any replacement maintains the same VBO range and package configuration. Generic equivalents may lack the specific glass-passivation reliability of the original component.

FAQ

What is the difference between VBO and VDRM for this device?

VBO (Breakover Voltage) is the voltage at which the device switches to the low-resistance state, ranging from 205 V to 230 V. VDRM (Rated Repetitive Off-State Voltage) is the maximum voltage the device can withstand in the off-state without triggering, specified here as 180 V.

Is the K2200EH70 suitable for DC applications?

No, the K2200EH70 is a bidirectional trigger diode (Sidac) designed primarily for AC switching and triggering applications. It is not intended for direct DC latching or switching operations.

How does the holding current affect circuit design?

The maximum holding current (Ih) of 150 mA indicates the minimum current required to keep the device in the on-state. If the circuit current drops below this value, the device will return to its high-resistance off-state, which must be considered in load design.