SJ4020L2TP

Overview

The Littelfuse SJ4020L2TP is a Silicon Controlled Rectifier (SCR) belonging to the SJxx20xx series, designed for high-power switching applications. It features a rated repetitive off-state voltage (VDRM) of 400 V and an on-state RMS current (It RMS) of 20 A. The device operates within a temperature range of -40 °C to +150 °C and utilizes a TO-220-2 through-hole package. Key electrical parameters include a forward voltage drop (Vf) of 1.6 V, a gate trigger voltage (Vgt) of 1.5 V, and a gate trigger current (Igt) of 10 mA. The non-repetitive on-state current capability is 300 A, with a maximum holding current (Ih) of 35 mA.

Feature Summary

• High thermal stability supporting operation up to +150 °C
• Robust surge handling with 300 A non-repetitive on-state current
• Low conduction loss characterized by 1.6 V forward voltage

Applications

• Industrial motor control systems
• AC power regulation circuits
• Resistive load switching applications

Procurement Notes

Verify component authenticity by cross-referencing the manufacturer part number SJ4020L2TP with official Littelfuse documentation. Confirm that the physical marking on the TO-220-2 package matches the datasheet specifications. Ensure the supplier provides traceability records consistent with Littelfuse manufacturing standards to guarantee performance reliability in critical power electronics designs.

Selection Notes

Select this component when a 400 V blocking voltage and 20 A continuous current rating are required in a through-hole configuration. The TO-220-2 package facilitates effective heat dissipation for moderate power levels. Consider the 10 mA gate trigger current for driver compatibility. Evaluate thermal management requirements based on the 1.6 V forward voltage drop during conduction periods to ensure junction temperatures remain within the specified operational limits.

Part Context

This SCR belongs to the SJxx20xx family from Littelfuse, which standardizes 20 A current ratings across various voltage classes. The L2 suffix typically denotes specific packaging or variant characteristics within this series. This component serves as a solid-state alternative to mechanical relays in AC power control scenarios, offering faster switching speeds and longer operational life compared to electromechanical counterparts.

Replacement Considerations

Direct replacements must match the 400 V / 20 A specification and TO-220-2 footprint. Verify gate trigger parameters against the original design constraints. Consult Littelfuse technical support for validated equivalent part numbers within the same product line or compatible third-party alternatives.