K2402G

Overview

The Littelfuse K2402G is a silicon bilateral voltage-triggered switch (SIDAC) from the Kxxxzy series, designed for AC circuit protection. It features a breakover voltage range of 220V to 250V and a repetitive peak off-state voltage of 190V. The device supports an on-state RMS current of 1A at 50/60Hz and handles a peak non-repetitive surge current of up to 16.7A at 50Hz. Packaged in DO-15 with matte tin plating, it operates within a junction temperature range of -40°C to 125°C.

Feature Summary

• Bidirectional switching capability utilizing negative resistance region for low on-state voltage conduction.
• Glass-passivated junction construction ensures ruggedness and dependability in harsh environments.
• RoHS compliant terminal finish using 100% matte tin plating.

Applications

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

Procurement Notes

Verify the specific package type required for your assembly process, as the K2402G designation corresponds to the DO-15 leaded package. Confirm that the 220V to 250V breakover voltage aligns with your circuit's triggering requirements. Ensure thermal management strategies account for the specified junction temperature limits during operation.

Selection Notes

Select this component when a bidirectional trigger is needed for AC circuits requiring a 220V to 250V activation threshold. The DO-15 package is suitable for through-hole mounting. Consider the 1A RMS current rating for load handling. Verify that the application does not exceed the critical rate of rise of off-state voltage or on-state current specifications.

Part Context

This part belongs to the Kxxxzy SIDAC family, which includes various voltage ratings and package options. The '240' indicates the specific voltage class, while '2' denotes the two-series die configuration for bidirectional operation. The 'G' suffix specifies the DO-15 axial leaded package format used in this component.

Replacement Considerations

Compatible substitutes include other K2402 variants with different packages, such as K2402S (DO-214) or K2402E (TO-92), provided the mechanical footprint allows. Other manufacturers offering standard bidirectional SIDACs with similar 220V-250V breakover voltages may be considered if electrical parameters match exactly.

FAQ

What is the difference between the K2400G and K2402G?

The K2400G is a standard unidirectional SIDAC, whereas the K2402G contains two series dies configured for bidirectional operation, making it suitable for AC circuits.

How does junction temperature affect the breakover voltage?

The breakover voltage decreases as the junction temperature increases. The datasheet provides a normalized change curve showing approximately a -10% shift at 125°C compared to 25°C.

What is the maximum allowable ambient temperature for free air operation?

The maximum allowable ambient temperature depends on the RMS on-state current. At zero current, it can reach 130°C, but it drops significantly as current increases due to self-heating.