SJ6040N2TP

Overview

The Littelfuse SJ6040N2TP is a high-temperature silicon-controlled rectifier (SCR) in the SJxx40xx series, designed for uni-directional switching applications. It features a 600V blocking voltage and a 40A RMS on-state current rating. The device utilizes a sensitive gate structure requiring a maximum trigger current of 15mA at approximately 1.5V. Packaged in a surface-mount TO-263 (D²Pak), it supports an operating junction temperature range from -40°C to 150°C. Key electrical limits include a peak non-repetitive surge current of 520A at 60Hz and a maximum on-state voltage of 1.7V.

Feature Summary

• Capable of reliable operation at elevated junction temperatures up to 150°C, mitigating thermal runaway risks in designs with limited cooling capacity.
• Sensitive gate architecture enables triggering with low gate currents (15mA) and voltages (1.5V), simplifying control circuitry requirements.
• High surge current capability allows tolerance of transient overloads without immediate component failure.
• Surface-mount D²Pak package facilitates automated assembly and efficient heat dissipation through the mounting tab.

Applications

• AC rectifiers and voltage regulators
• Phase control in heating systems
• Motor speed controls
• AC solid-state switches

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official datasheet to confirm package type and gate sensitivity. Ensure the procurement documentation explicitly references the SJxx40xx series specifications. Confirm compliance with RoHS and halogen-free requirements as stated in the product description. Cross-reference the part number with Littelfuse's current product selector to validate availability and packaging options before finalizing orders.

Selection Notes

Select this component for applications requiring high-temperature resilience and surface-mount integration. Evaluate the thermal resistance from junction to case (0.8 °C/W) to determine appropriate heatsinking strategies. Consider the dv/dt ratings under varying junction temperatures to ensure stability against line noise. Verify that the average on-state current derating curves align with the expected load profile and ambient conditions.

Part Context

This part belongs to the Littelfuse SJxx40xx series of 40 Amp standard high-temperature SCRs. The series was introduced to address design challenges in harsh environments where cooling is limited. The 'N' designation indicates the TO-263 surface-mount package, while the '2' suffix specifies the 15mA sensitive gate variant. This family complements Littelfuse's broader power control portfolio by offering robust thyristor solutions for industrial and commercial appliances.

Replacement Considerations

Consult the Littelfuse SJxx40xx product selector for direct equivalents within the same series. Potential substitutes include other packages in the series such as SJ6040R2 or SJ6040L2, provided the mechanical footprint and isolation requirements are compatible. Verify that any replacement maintains the 600V rating and 15mA gate sensitivity characteristics.