NXP Semiconductors BUK954R4-80E,127

Overview

BUK954R4-80E from Nexperia is an AEC-Q101-qualified N-channel TrenchMOS logic-level power MOSFET in TO-220AB (SOT78A) package, rated for 80 V V_DS, 120 A continuous drain current at T_mb = 25 °C, and 3.6 mΩ typical R_DS(on) at V_GS = 5 V and T_j = 25 °C. It serves as a high-current, thermally robust switching element in automotive power control circuits including start-stop systems and transmission modules.

For engineers reviewing the BUK954R4-80E datasheet, BUK954R4-80E pinout, BUK954R4-80E application, or BUK954R4-80E equivalent, key selection criteria include its 175 °C junction rating, repetitive avalanche capability, true logic-level gate drive (V_GS(th) ≥ 0.5 V at 175 °C), and low thermal resistance (R_th(j-mb) = 0.43 K/W).

Technical Context

This device employs TrenchMOS technology to achieve low on-resistance and fast switching with minimal gate charge (Q_G(tot) = 123 nC, Q_GD = 37.5 nC). Its gate threshold voltage remains functional up to 175 °C, enabling reliable operation in under-hood environments without elevated gate drive voltage.

The integrated source-drain diode exhibits 61 ns reverse recovery time and 139 nC recovered charge, supporting synchronous rectification and freewheeling in inductive load switching. Thermal design is anchored by direct die-to-mounting-base conduction (R_th(j-mb) ≤ 0.43 K/W), making heatsink interface performance critical to sustained 120 A operation.

Key Specifications

Pinout & Package

BUK954R4-80E uses the TO-220AB (SOT78A) plastic single-ended package with heatsink-mounted mounting base electrically connected to the drain terminal. The package features three leads and one mounting hole, optimized for high-power dissipation in constrained automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level power MOSFET applications.

Compared with STL220N6F7 and IRF1405PBF, BUK954R4-80E uniquely combines 80 V rating, AEC-Q101 qualification, 175 °C operation, and true 5 V logic-level drive-making it the only viable option for thermally demanding 48 V automotive power switching where reliability and gate drive simplicity are mandatory.

Availability

BUK954R4-80E is available at Aetrix Electronics and suitable for automotive power distribution, start-stop systems, and transmission control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BUK954R4-80E 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 leader in discrete, logic, and power MOSFET semiconductors, spun off from NXP in 2017 and focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

The BUK954R4-80E belongs to Nexperia's TrenchMOS logic-level automotive power MOSFET product line, engineered specifically for robust, high-current switching in thermally aggressive automotive environments including engine control, transmission, and 48 V mild hybrid systems.

FAQ

What is the maximum continuous drain current rating for BUK954R4-80E?

The BUK954R4-80E supports 120 A continuous drain current at mounting base temperature (T_mb) = 25 °C, limited by package thermal capability-not silicon. At T_mb = 100 °C, the rating remains 120 A due to thermal derating curves, but effective current must be reduced to maintain T_j ≤ 175 °C. Full 120 A operation requires active heatsinking with R_th(m-b) ≤ 0.43 K/W.

Is BUK954R4-80E suitable for 48 V automotive systems?

Yes, BUK954R4-80E is explicitly designed for 12 V, 24 V, and 48 V automotive systems. Its 80 V V_DS rating provides essential margin against load-dump transients (up to ISO 7637-2 Pulse 5a: +120 V) and inductive spikes. Combined with AEC-Q101 qualification and 175 °C operation, it meets stringent requirements for 48 V mild hybrid power distribution and DC-DC conversion.

Does BUK954R4-80E require a gate driver IC?

No, BUK954R4-80E is a true logic-level MOSFET with V_GS(th) ≥ 0.5 V at 175 °C, enabling direct drive from 3.3 V or 5 V microcontroller GPIOs. While a gate driver improves switching speed and reduces losses in high-frequency PWM applications, it is not required for basic on/off control-unlike standard-threshold MOSFETs needing ≥10 V gate drive.

What is the thermal resistance from junction to mounting base for BUK954R4-80E?

The maximum thermal resistance from junction to mounting base (R_th(j-mb)) for BUK954R4-80E is 0.43 K/W. This value reflects the intrinsic thermal path through the die, solder, and copper slug to the heatsink interface. Achieving this performance requires proper mounting torque, thermal interface material, and flatness compliance per Nexperia's SOT78A mechanical guidelines.

How does the avalanche ruggedness of BUK954R4-80E benefit automotive designs?

BUK954R4-80E is rated for 488 mJ non-repetitive drain-source avalanche energy (E_AS) and is repetitively avalanche rated. This allows it to safely absorb inductive energy from solenoids, motors, and relays during switching transitions or fault conditions-eliminating the need for external snubbers in many automotive load-control circuits and improving system robustness without added BOM cost.