BUK7105-40AIE,118

Overview

The BUK7105-40AIE is a standard level N-channel enhancement mode Field-Effect Transistor utilizing TrenchMOS technology. It features an integrated current sensor and ElectroStatic Discharge (ESD) protection diodes, designed for automotive critical applications compliant with AEC-Q101. The device operates in a D2PAK plastic package with five leads. Key electrical parameters include a drain-source voltage of 40 V, a continuous drain current of 155 A at 25 °C mounting base temperature, and a typical on-state resistance of 4.5 mΩ at 25 °C. The junction temperature range spans from -55 °C to +175 °C.

Feature Summary

• Integrated current sensing capability reduces component count
• Electrostatically robust design with built-in ESD protection diodes
• Optimized for standard level gate drive sources
• Low conduction losses achieved through low on-state resistance

Applications

• Electrical Power Assisted Steering (EPAS)
• Variable Valve Timing for engines

Procurement Notes

Verify the specific ordering suffix against official Nexperia documentation to confirm package variant and reel specifications. Confirm that the intended application environment meets the AEC-Q101 qualification requirements. Ensure thermal management designs account for the specified power dissipation limits relative to the mounting base temperature. Cross-reference the pinout configuration with the target PCB footprint to guarantee correct alignment of the Kelvin source and sense terminals.

Selection Notes

Select this component when precise current monitoring is required within a single package to simplify circuit topology. The integrated sense feature eliminates the need for external shunt resistors in specific control loops. Verify that the system's gate drive voltage aligns with the standard level threshold characteristics. Consider the thermal resistance values when designing heat sinks or PCB copper areas to maintain junction temperatures within safe operating limits during peak load conditions.

Part Context

This device belongs to the BUK71 series of N-channel MOSFETs manufactured by Nexperia. It utilizes TrenchPLUS technology to combine high current handling with integrated sensing functions. The product line targets automotive markets requiring robust performance under varying thermal conditions. The D2PAK package provides a balance between power density and ease of surface-mount assembly for industrial and automotive electronics.

Replacement Considerations

Direct substitutes must match the 40 V rating, 155 A current capacity, and integrated sense functionality. Verify package compatibility with the SOT426 (D2PAK) outline. Check if alternative parts offer comparable RDS(on) and gate charge specifications to ensure switching performance remains consistent within the existing driver circuitry.

FAQ

What is the purpose of the fifth lead in the D2PAK package?

The fifth lead serves as the Kelvin source connection, providing a dedicated path for accurate current sensing separate from the main source terminal.

How does the integrated current sensor function?

The device includes a dedicated sense terminal that outputs a current proportional to the main drain current, allowing for monitoring without external shunt resistors.

Is this component suitable for high-voltage automotive environments?

Yes, it is qualified to AEC-Q101 standards and rated for junction temperatures up to 175 °C, making it suitable for demanding automotive applications like EPAS.