K2401GL

Overview

The Littelfuse K2401GL is a Multipulse SIDAC voltage switch designed for metal-halide and high-pressure sodium lamp ignition circuits. It operates in a DO-15 axial leaded package with glass-passivated junctions. The device features a breakover/trigger voltage (VBO) range of 220 V to 250 V and a repetitive peak off-state voltage (VDRM) of 190 V minimum. It supports an on-state RMS current (IT(RMS)) of 1 A at a maximum junction temperature of 125°C. Key electrical parameters include a non-repetitive surge forward current (IFSM) of 50 A, a dynamic holding current (IH) typically of 30 mA, and a commutation time (tCOMM) of 100 μsec maximum.

Feature Summary

• Designed for robust operation in lamp igniter applications requiring multiple pulses per half cycle of 50/60 Hz line voltage.
• Capable of handling ambient temperatures up to 90°C with junction temperatures reaching 125°C during critical conditions.
• Utilizes glass-passivated junctions to ensure reliable blocking capability and withstand harsh environmental testing.

Applications

• Metal-halide lamp ignition circuits
• High-pressure sodium lamp ignition circuits for outdoor street and area lighting

Procurement Notes

Verify the specific ordering suffix against the manufacturer's datasheet to confirm packaging configuration. Options include bulk, reel pack, or ammo pack formats. Ensure the component meets RoHS compliance requirements for the intended assembly process. Confirm that the DO-15 axial leaded package dimensions align with the printed circuit board layout constraints.

Selection Notes

Select the K2401GL when a breakover voltage between 220 V and 250 V is required for lamp starting. Ensure the circuit design accommodates the 1 A RMS current rating and the 125°C maximum junction temperature limit. Consider the thermal resistance of 18 °C/W for heat dissipation calculations. Verify that the switching resistance and commutation time meet the pulse generation requirements of the specific ballast design.

Part Context

The K2401GL belongs to the Littelfuse Kxxx1GL series of Multipulse SIDACs. This family includes variants with different trigger voltages, such as the K2201GL, K2501GL, and K3601GL. All devices in this series share the same DO-15 package and general electrical characteristics, differing primarily in their breakover and blocking voltage specifications.

Replacement Considerations

Direct substitutes within the same series include the K2201GL, K2501GL, and K3601GL, provided their respective voltage ratings match the circuit requirements. Cross-brand replacements require careful verification of VBO, VDRM, IT(RMS), and package compatibility.

FAQ

What is the maximum operating junction temperature for the K2401GL?

The maximum operating junction temperature (Tvj) is +125°C.

How does the K2401GL handle high ambient temperatures?

It is designed to operate at ambient temperatures up to 90°C, allowing the junction temperature to reach 125°C, which is critical for igniter circuits where components may raise the temperature further.

What is the typical dynamic holding current (IH) for this device?

The typical dynamic holding current (IH) is 30 mA, measured with a 100 Ω resistor under 50/60 Hz sine wave conditions.