SJ4020N1ARP

Overview

The Littelfuse SJ4020N1ARP is a Silicon Controlled Rectifier (SCR) from the SJxx20xx series, designed for high-temperature applications with a maximum junction temperature of +150°C. 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 utilizes a TO-263 (D2PAK) surface-mount package. Key electrical parameters include a forward voltage (Vf) of 1.6 V, a gate trigger voltage (Vgt) of 1.5 V, and a gate trigger current (Igt) of 6 mA. The holding current (Ih) maximum is 15 mA, while the non-repetitive on-state current reaches 300 A. Operating temperatures range from -40°C to +150°C.

Feature Summary

• High junction temperature capability up to +150°C for robust thermal performance
• Surface-mount TO-263 (D2PAK) package design for automated assembly
• Low gate trigger current of 6 mA for efficient control circuitry integration

Applications

• Industrial motor control systems requiring high-temperature reliability
• Power supply circuits utilizing surface-mount thyristors
• Solid-state relay applications in harsh thermal environments

Procurement Notes

Verify the specific suffix 'ARP' against official Littelfuse documentation to confirm the exact pinout and tape-and-reel specifications for the TO-263 package. Ensure that the 400V rating aligns with system voltage requirements, as other variants in the series may offer different blocking voltages. Cross-reference the datasheet for precise thermal resistance values and mounting guidelines to ensure proper heat dissipation in the final application.

Selection Notes

Select the SJ4020N1ARP when a surface-mount SCR is required for high-current applications operating at elevated temperatures. Compare its 6 mA gate trigger current against alternatives if low-power gate drive is critical. Consider the TO-263 footprint constraints and verify that the 20 A RMS current rating meets the load demands. Evaluate the 150°C junction temperature limit against the ambient conditions to determine if additional heatsinking is necessary for long-term stability.

Part Context

This component belongs to the Littelfuse SJ series of power SCRs, which are characterized by high blocking voltages up to 600V and current ratings from 4A to 40A. The series is engineered for high junction temperature operation, making it suitable for demanding industrial and automotive environments. The SJ4020N1ARP specifically represents the 400V, 20A variant within this family, offering a balance of current handling and voltage blocking in a compact surface-mount form factor.

Replacement Considerations

The SJ4020L1TP is a through-hole alternative within the same series but uses a TO-220 package rather than the TO-263 SMD format. Verify compatibility based on mounting style requirements. Other series members like the SJ4020RATP share similar electrical ratings but differ in gate trigger current and holding current specifications, requiring careful evaluation of gate drive capabilities before substitution.