K3002G

Overview

The Littelfuse K3002G is a silicon bilateral voltage-triggered switch (SIDAC) from the Kxxxzy series, designed for AC circuit applications. It features a breakover/trigger voltage range of 270 V to 330 V and a repetitive peak off-state voltage of 200 V. The device supports an on-state RMS current of 1 A at 50/60 Hz with a junction temperature below 125°C. Key electrical parameters include a peak on-state voltage of 3.0 V at 1 A, a dynamic holding current between 10 mA and 150 mA, and a breakover current of 10 µA. It withstands a critical rate of rise of on-state current (di/dt) of 150 A/µs and off-state voltage (dv/dt) of 1500 V/µs. The component operates within a junction temperature range of -40°C to 125°C and utilizes a DO-15 package.

Feature Summary

• Glass-passivated junction construction ensures ruggedness and dependability in harsh environments.
• Bidirectional switching capability allows operation in AC circuits without polarity constraints.
• Negative resistance region enables rapid transition to low on-state voltage upon triggering.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm the package type and marking code. Ensure that the selected variant matches the required thermal resistance and physical dimensions for the intended PCB layout or assembly process. Cross-reference the part number with the latest revision history to confirm compliance with current RoHS standards and material specifications.

Selection Notes

Select this component based on the required breakover voltage range of 270 V to 330 V for the specific application. Consider the thermal management requirements, as the junction temperature must remain within -40°C to 125°C during operation. Evaluate the circuit's expected surge currents against the ITSM rating to ensure reliable interruption of overcurrent events without damaging the device.

Part Context

This SIDAC belongs to the Kxxxzy series of standard bidirectional switches manufactured by Littelfuse. The series offers various voltage ratings and package options, including DO-15, DO-214, and TO-92. The K3002G specifically denotes the 270-330 V trigger voltage range with a DO-15 axial leaded package, providing a compact solution for high-voltage triggering needs.

Replacement Considerations

Compatible substitutes within the same family include other Kxxxzy variants with matching voltage ratings, such as K2502G or K3000G, provided the trigger voltage and current specifications align with the design requirements. Verify package compatibility when substituting to ensure mechanical fit and soldering profile adherence.