SJ4040NATP

Overview

The Littelfuse SJ4040NATP is a Silicon Controlled Rectifier (SCR) from the SJxx20xx series, designed for high-temperature operation. It features a rated repetitive off-state voltage of 400 V and an on-state RMS current of 20 A. The device operates within a junction temperature range of -40°C to +150°C. Key electrical parameters include a forward voltage of 1.6 V, gate trigger voltage of 1.5 V, and gate trigger current of 35 mA. It is housed in a TO-263AB-3 surface-mount package and holds AEC-Q101 qualification.

Feature Summary

• Capable of withstanding high junction temperatures up to 150°C to mitigate thermal runaway risks in applications with limited cooling.
• Offers flexible installation options through the TO-263 surface-mount package format.
• Features high commutating dv/dt ratings to tolerate line noise and surges common in commercial AC power sources.

Applications

• Rectifiers for various end-use equipment
• AC solid state switches
• Industrial electric tools
• White goods and commercial appliances

Procurement Notes

Verify the specific suffix against official Littelfuse documentation to confirm pinout and thermal characteristics. Confirm AEC-Q101 automotive qualification status if required for the target application. Ensure the TO-263AB-3 footprint matches the PCB design constraints. Check for any recent product change notices that may affect availability or specifications.

Selection Notes

Select this component when designing circuits requiring robust performance at elevated temperatures up to 150°C. The 20A RMS rating suits moderate power phase control tasks. Verify that the 1.5V gate trigger voltage aligns with the driving circuit capabilities. Consider the TO-263 package for automated surface-mount assembly processes.

Part Context

This part belongs to the SJxx40x series, introduced by Littelfuse as their first SCR handling 600V, 40Arms, and 150°C junction temperatures. While the SJ4040NATP shares the series' high-temperature design philosophy, it is specifically rated for 400V and 20A. The series aims to help designers overcome thermal challenges in devices with limited cooling capacity.

Replacement Considerations

Direct substitutes within the same family include the SJ4020NATP, which shares the TO-263 package but differs in current rating. Cross-series replacements like the S4040NRP offer similar voltage ratings but utilize different packaging and thermal limits. Verify all electrical parameters before substitution.

FAQ

What is the maximum operating junction temperature for the SJ4040NATP?

The maximum operating junction temperature is +150°C, allowing for reliable operation in thermally constrained environments.

Is the SJ4040NATP qualified for automotive applications?

Yes, the component holds AEC-Q101 qualification, indicating suitability for automotive electronic systems.

What is the typical gate trigger current required to turn on the device?

The gate trigger current is specified as 35 mA, enabling activation with low-power drive signals.