Nexperia USA Inc. BUK7905-40ATE,127

Overview

BUK7905-40ATE from Nexperia is a standard-level N-channel TrenchPLUS MOSFET in TO-220 (SOT263B) package, featuring integrated temperature-sensing diode (TSD) and ESD protection diodes. It delivers 40 V V_DS, 4.5 mΩ R_DS(on) at 10 V V_GS/25 °C, and AEC-Q101 qualification for automotive critical systems such as EPAS and variable valve timing.

For engineers reviewing the BUK7905-40ATE datasheet, BUK7905-40ATE pinout, BUK7905-40ATE application, or BUK7905-40ATE equivalent, this device offers verified thermal sensing capability (−1.54 mV/K TSD coefficient), low-inductance internal layout (L_D = 2.5 nH, L_S = 7.5 nH), and rugged unclamped avalanche energy (1.46 J) - key selection criteria for high-reliability power switching.

Technical Context

This MOSFET uses TrenchMOS technology with integrated TSD and bidirectional ESD protection diodes across gate-source and drain-source paths. Its standard-level gate threshold (2–4 V) enables direct drive from 5 V or 3.3 V microcontrollers without level-shifting.

The device supports high-current continuous operation (75 A at T_mb = 100 °C) and pulsed peak current (620 A, 10 µs), enabled by low R_th(j-mb) = 0.55 K/W and mounting-base thermal interface. The TSD provides real-time junction temperature monitoring with ±32 mV hysteresis and calibrated forward voltage (658 mV typ at 25 °C).

Key Specifications

Pinout & Package

Package: TO-220 plastic single-ended package (SOT263B), heatsink-mounted with one mounting hole and five leads. Mounting base is electrically connected to drain.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel automotive power switching applications.

Compared with STL220N4F7AG and IRF1405ZPBF, BUK7905-40ATE uniquely combines AEC-Q101 compliance, integrated TSD, and ESD protection in a thermally optimized TO-220 package - making it the only choice for EPAS and VVT systems requiring functional safety and real-time thermal management.

Availability

BUK7905-40ATE is available at Aetrix Electronics and suitable for Electrical Power Assisted Steering (EPAS), Variable Valve Timing (VVT), and electric brake booster systems requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.

Supply support for BUK7905-40ATE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection solutions.

This device belongs to Nexperia's TrenchPLUS automotive MOSFET product line, engineered specifically for high-current, thermally demanding automotive subsystems where integrated diagnostics and AEC-Q101 reliability are mandatory.

FAQ

What is the function of pins 2 (A) and 4 (K) on the BUK7905-40ATE?

Pins 2 (Anode) and 4 (Cathode) form the terminals of an integrated silicon temperature-sense diode (TSD). When biased with a constant 250 µA current, the forward voltage drop across these pins changes linearly with junction temperature at −1.54 mV/K, enabling accurate real-time thermal monitoring without external sensors.

Can the BUK7905-40ATE be driven directly by a 3.3 V microcontroller GPIO?

Yes - its gate threshold voltage (V_GS(th)) ranges from 2 V to 4 V, and it achieves full enhancement (R_DS(on) ≤ 5 mΩ) at V_GS = 10 V. While 3.3 V is below optimal drive, the device remains partially enhanced and can switch moderate currents; however, for full 75 A capability and minimal conduction loss, a dedicated gate driver or level shifter is recommended.

How does the mounting base connection affect thermal design?

The mounting base (pin 3, Drain) is electrically tied to the drain and serves as the primary thermal interface. With R_th(j-mb) = 0.55 K/W, it enables efficient heat transfer to an external heatsink. This configuration eliminates reliance on PCB copper for thermal conduction, allowing compact, high-power designs in constrained under-hood environments.

Is the BUK7905-40ATE suitable for synchronous rectification in DC-DC converters?

Yes - its low R_DS(on) (4.5 mΩ), fast switching (t_d(on) = 35 ns, t_f = 110 ns), and low output capacitance (C_oss = 1500 pF) make it well-suited for high-frequency synchronous rectification in 12 V automotive DC-DC converters, especially when combined with its TSD for adaptive thermal derating.