K2502G

Overview

The Littelfuse K2502G is a standard bidirectional SIDAC (Silicon Bidirectional Trigger Device) belonging to the Kxxxzy series. It functions as a silicon bilateral voltage-triggered switch, switching on through a negative resistance region when the applied voltage exceeds its breakover point. The device features glass-passivated junctions for ruggedness and reliability in harsh environments. Key electrical specifications include a breakover voltage range of 240V to 280V, a repetitive peak off-state voltage of 200V, and an on-state RMS current rating of 1A at 50/60Hz. It utilizes a DO-15 package with matte tin-plated copper alloy leads.

Feature Summary

• Bidirectional AC circuit triggering capability
• Glass-passivated junction construction for environmental durability
• RoHS compliant manufacturing

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm the exact package type and lead form configuration. Ensure that the component meets RoHS compliance requirements if mandated by the design specification. Confirm the thermal resistance parameters align with the intended mounting method and ambient operating conditions to prevent overheating during operation.

Selection Notes

Select this component based on the required breakover voltage range of 240V to 280V for the specific application circuit. Consider the 1A RMS current rating and the critical rate of rise of on-state current (di/dt) limits when designing the load interface. Evaluate the thermal management requirements relative to the junction-to-ambient thermal resistance provided in the datasheet for the selected package style.

Part Context

This part belongs to the Kxxxzy Series of Standard Bidirectional SIDACs manufactured by Littelfuse. The series offers various breakover voltage options ranging from 79V to 330V across different package styles including DO-15, DO-214, and TO-92. These devices are designed to replace discrete diac-triac combinations, simplifying assembly and reducing component count in AC phase control applications.

Replacement Considerations

Compatible substitutes within the same family include K2500G and K2502S, which share identical electrical characteristics but differ in package style. Verify that any replacement maintains the same breakover voltage tolerance and current ratings to ensure circuit compatibility.