Nexperia USA Inc. BUK7520-55A,127

Overview

BUK7520-55A from NXP Semiconductors is a standard-level N-channel TrenchMOS FET in TO-220AB (SOT78) package, designed for automotive-critical 12 V/24 V power switching. It delivers 54 A continuous drain current at 25 °C mounting base temperature, 40 mΩ R_DS(on) at 175 °C junction temperature, and 115 mJ unclamped avalanche energy - enabling robust motor, lamp, and solenoid control in thermally demanding environments.

For engineers reviewing the BUK7520-55A datasheet, BUK7520-55A pinout, BUK7520-55A application, or BUK7520-55A equivalent, key selection criteria include its AEC-Q101 qualification, 175 °C maximum junction rating, gate-drive compatibility with standard 10 V logic, and thermal resistance of 1.2 K/W from junction to mounting base.

Technical Context

This MOSFET employs TrenchMOS technology to achieve low conduction losses and high thermal resilience. Its gate threshold voltage ranges from 1 V at 175 °C to 4.4 V at −55 °C, ensuring reliable turn-on across automotive temperature extremes. The integrated source-drain diode exhibits 0.85 V forward voltage at 20 A and 45 ns reverse recovery time, supporting inductive load commutation.

The device features 1200 pF typical input capacitance and 179 pF reverse transfer capacitance at 25 V V_DS, enabling fast switching with 15 ns turn-on delay and 40 ns fall time under 10 Ω gate drive. Its 1.2 K/W junction-to-mounting-base thermal resistance allows direct heatsink mounting for high-power dissipation up to 118 W at 25 °C ambient.

Key Specifications

Pinout & Package

Package: TO-220AB (SOT78), plastic single-ended package with heatsink-mounted metal base electrically connected to drain. Mounting base provides mechanical attachment and primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP55NF06L and IRFZ44NPBF, the BUK7520-55A uniquely combines AEC-Q101 qualification, 175 °C operation, and 40 mΩ R_DS(on) at full temperature - making it the only option qualified for under-hood automotive power switching without thermal derating.

Availability

BUK7520-55A is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, commercial vehicle lighting systems, and heavy-duty solenoid control requiring stable component supply across extended temperature and lifetime requirements.

Supply support for BUK7520-55A 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

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

This device belongs to NXP's TrenchMOS automotive power portfolio, engineered specifically for high-reliability, high-temperature power switching in engine management, body control, and chassis systems.

FAQ

Is BUK7520-55A suitable for high-frequency PWM motor control?

Yes - with 15 ns turn-on delay, 40 ns fall time, and 1200 pF input capacitance, it supports PWM frequencies up to 100 kHz in brushed DC motor drives. However, switching losses increase above 50 kHz due to gate charge of 40 nC; gate driver selection must account for this to maintain efficiency.

What is the maximum safe operating area (SOA) at 100 °C mounting base temperature?

At T_mb = 100 °C, the device supports 38 A continuous drain current per Figure 1. The SOA curve (Figure 3) shows it can sustain 54 A at V_DS ≤ 1 V, 20 A at V_DS ≤ 10 V, and 5 A at V_DS ≤ 40 V in DC operation - all within thermal limits when mounted to an adequately sized heatsink.

Does the mounting base require electrical isolation from the heatsink?

No - the mounting base is electrically connected to the drain pin, so isolation is required only if the heatsink is referenced to a different potential than the drain node. In most low-side switch configurations, the heatsink must be isolated; in high-side configurations with floating heatsinks, isolation may be omitted per system grounding scheme.

Can BUK7520-55A replace BUZ70 in existing designs?

Yes - both are TO-220AB N-channel FETs with 55 V V_DS and similar R_DS(on). However, BUK7520-55A offers lower R_DS(on) (17 mΩ vs. 22 mΩ), AEC-Q101 qualification, and 175 °C rating versus BUZ70's 150 °C, enabling higher current density and automotive deployment without redesign.