Nexperia USA Inc. BUK9225-55A,118

Overview

BUK9225-55A,118 from Nexperia is a logic-level N-channel TrenchMOS FET in DPAK (SOT428) package, rated for 55 V V_DS, 43 A continuous drain current at 25 °C mounting base temperature, and 175 °C junction operation-designed per AEC-Q101 for automotive power switching of 12 V/24 V loads including motors, lamps, and solenoids.

For engineers reviewing the BUK9225-55A datasheet, BUK9225-55A pinout, BUK9225-55A application, or BUK9225-55A equivalent, key selection criteria include R_DS(on) at 4.5 V gate drive (27 mΩ typ), avalanche energy rating (123 mJ), thermal resistance to mounting base (1.6 K/W), and qualification for thermally demanding automotive environments.

Technical Context

This device uses TrenchMOS technology to achieve low on-state resistance with logic-level gate compatibility (V_GS(th) = 1–2 V at 25 °C), enabling direct drive from microcontrollers or automotive logic ICs without level-shifting circuitry. Its unclamped inductive switching capability supports robust load switching in relayless architectures.

The integrated source-drain diode exhibits 0.85–1.2 V forward voltage at 15 A and 25 °C, with 50 ns reverse recovery time and 85 nC recovered charge-critical for minimizing switching losses in freewheeling paths of motor drivers and solenoid controllers.

Key Specifications

Pinout & Package

Package: SOT428 (DPAK), plastic single-ended surface-mounted package with 3 leads (lead 1 cropped); mounting base (mb) electrically connected to drain for low-inductance thermal and power path routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STL225N5LF5AG and IRF3205PBF, the BUK9225-55A uniquely delivers AEC-Q101 certification, guaranteed 5 V logic-level turn-on, and validated 175 °C operation-making it the only choice for thermally constrained, safety-compliant automotive power switching where gate drive simplicity and reliability are mandatory.

Availability

BUK9225-55A,118 is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V motor drives, and industrial solenoid controllers requiring stable component supply and long-lifecycle support.

Supply support for BUK9225-55A,118 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, logic, and MOSFET solutions-originally spun off from NXP in 2017 and headquartered in Nijmegen, Netherlands.

The BUK9225-55A belongs to Nexperia's Automotive Logic-Level Power MOSFET product line, engineered specifically for robust, low-loss switching in 12 V/24 V automotive subsystems where AEC-Q101 compliance and thermal resilience are non-negotiable.

FAQ

Is BUK9225-55A,118 suitable for high-frequency PWM motor control?

Yes-it supports PWM frequencies up to 20 kHz with minimal switching loss due to its 1360 pF input capacitance, 160–222 pF Crss, and 17 ns turn-on delay. The 50 ns reverse recovery time and low internal inductances (2.5 nH drain, 7.5 nH source) further reduce ringing and EMI in closed-loop motor control loops.

What is the maximum continuous drain current at 100 °C mounting base temperature?

The datasheet specifies 30 A continuous drain current at T_mb = 100 °C and V_GS = 5 V. This derating reflects thermal limits imposed by the 1.6 K/W R_th(j-mb) and 175 °C T_j max, ensuring safe operation in high-ambient under-hood applications.

Does BUK9225-55A,118 require a gate resistor for automotive ESD protection?

A series gate resistor (typically 10–47 Ω) is recommended to dampen oscillation and limit peak gate current during fast edge transitions, especially when driven directly from MCU pins. While not required for basic functionality, it improves EMC robustness and prevents gate oxide overstress in noisy automotive environments.

Can this MOSFET replace older parts like BUZ70 or IRFZ44N in existing designs?

Yes-with caveats: BUK9225-55A offers lower R_DS(on) at 5 V (21–25 mΩ vs. ~28 mΩ for IRFZ44N at 10 V), AEC-Q101 qualification, and superior thermal rating. Pin-compatible in DPAK, but verify layout thermal relief and gate drive strength, as its higher C_iss may increase drive power requirements at very high frequencies.