NXP Semiconductors BUK7540-100A,127

Overview

BUK7540-100A from Nexperia is an AEC-Q101 qualified N-channel TrenchMOS standard-level power MOSFET in TO-220AB (SOT78A) package, designed for automotive-critical switching. It delivers 100 V drain-source voltage rating, 37 A continuous drain current at T_mb = 25 °C, and 30 mΩ typical R_DS(on) at V_GS = 10 V and T_j = 25 °C, enabling efficient high-current DC load control in engine management and body electronics.

For engineers reviewing the BUK7540-100A datasheet, BUK7540-100A pinout, BUK7540-100A application, or BUK7540-100A equivalent, this page provides verified technical context, thermal performance data, avalanche ruggedness (31 mJ), gate drive compatibility (V_GS(th) = 2–4 V), and real-world automotive use cases with design-meaningful parameter interpretation.

Technical Context

This device uses TrenchMOS technology to achieve low conduction losses and robust unclamped inductive switching capability. Its gate threshold voltage (2–4 V at T_j = 25 °C) ensures reliable turn-on with standard 5 V or 10 V logic-level drivers, while its 1.1 K/W junction-to-mounting-base thermal resistance supports high-power dissipation when heatsink-mounted.

The BUK7540-100A features integrated source-drain diode with 0.85–1.2 V forward voltage at 25 A and 70 ns reverse recovery time, enabling synchronous rectification and flyback energy handling. Its dynamic parameters-including 1720–2293 pF input capacitance and 12–18 ns turn-on delay-support fast-switching operation up to ~100 kHz in automotive DC-DC and motor control stages.

Key Specifications

Pinout & Package

Package: TO-220AB (SOT78A), plastic single-ended package with heatsink-mounted mounting base electrically connected to drain. Requires mechanical mounting via screw through central hole; leads are tinned except terminal zone near mounting base.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP110N10F7 and IRF540NPBF, the BUK7540-100A uniquely combines AEC-Q101 compliance, 31 mJ avalanche ruggedness, and 30 mΩ on-resistance in a TO-220AB footprint-making it the only option qualified for automotive power switching where both reliability and thermal efficiency are mandatory.

Availability

BUK7540-100A is available at Aetrix Electronics and suitable for automotive engine control, body electronics, ADAS subsystems, and commercial vehicle lighting requiring stable component supply across long production lifecycles.

Supply support for BUK7540-100A 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 PowerMOS semiconductors, spun off from NXP in 2017 and focused on high-volume, high-reliability components for automotive, industrial, and computing markets.

The BUK7540-100A belongs to Nexperia's TrenchMOS automotive-qualified power MOSFET family, engineered specifically for robust, thermally efficient switching in harsh-environment automotive power distribution and actuation systems.

FAQ

What is the maximum junction temperature rating for the BUK7540-100A?

The BUK7540-100A has a maximum junction temperature (T_j) of 175 °C, validated per AEC-Q101 stress testing. This allows sustained operation in under-hood environments where ambient temperatures exceed 125 °C, provided thermal design maintains T_j ≤175 °C. The BUK7540-100A datasheet specifies derating curves for power dissipation versus mounting base temperature to ensure safe operation.

Is the BUK7540-100A pin-compatible with standard TO-220AB footprints?

Yes, the BUK7540-100A uses the SOT78A (TO-220AB) package with standardized lead pitch (2.54 mm), outline dimensions, and mounting hole location per JEDEC SC-46. Its pin 1 (G), pin 2 (D), and pin 3 (S) assignment matches industry-standard TO-220AB layouts, enabling drop-in replacement in existing designs using compatible thermal interface materials and isolation hardware.

Does the BUK7540-100A require a gate resistor for automotive applications?

A gate resistor is recommended for the BUK7540-100A to control dV/dt and prevent oscillation during switching-especially in noisy automotive environments. Typical values range from 10 Ω to 47 Ω depending on driver strength and layout parasitics. The BUK7540-100A's 12–18 ns turn-on delay and 55–83 ns rise time make it responsive to moderate gate resistance without compromising PWM efficiency.

Can the BUK7540-100A be used in high-frequency switching applications above 50 kHz?

Yes, the BUK7540-100A supports switching frequencies up to 100 kHz due to its 55–83 ns rise time, 30–42 ns fall time, and 1720–2293 pF input capacitance. However, switching loss increases with frequency; thermal design must account for combined conduction and switching losses. The BUK7540-100A is commonly deployed in 20–50 kHz DC-DC converters and PWM motor drivers where its 30 mΩ R_DS(on) minimizes total power loss.

What is the gate-source voltage limit for the BUK7540-100A?

The BUK7540-100A has a gate-source voltage limit (V_GS) of ±20 V, per Absolute Maximum Ratings. Operation beyond ±20 V risks permanent gate oxide damage. For reliable turn-on, V_GS ≥10 V is recommended to achieve full enhancement and minimize R_DS(on); the BUK7540-100A's V_GS(th) of 2–4 V ensures compatibility with 3.3 V and 5 V logic-level drivers when used with appropriate gate drive margin.