Nexperia USA Inc. BUK7237-55A,118

Overview

BUK7237-55A from Nexperia is a standard-level N-channel TrenchMOS FET in DPAK (SOT428) package, rated for 55 V V_DS, 32.3 A continuous drain current at T_mb = 25 °C, and 175 °C junction temperature. It delivers 31–37 mΩ R_DS(on) at 10 V V_GS and 25 °C, and is AEC-Q101 qualified for automotive power switching of 12 V/24 V loads including motors and solenoids.

For engineers reviewing the BUK7237-55A datasheet, BUK7237-55A pinout, BUK7237-55A application, or BUK7237-55A equivalent, key selection criteria include its 1.9 K/W R_th(j-mb), unclamped avalanche energy rating of 49 mJ, gate threshold voltage range (1–4.4 V), and compatibility with standard 10 V gate drive sources in thermally demanding environments.

Technical Context

This MOSFET uses TrenchMOS technology to achieve low conduction losses and high thermal robustness. Its gate-source threshold voltage varies from 1 V at 175 °C to 4.4 V at –55 °C, enabling stable turn-on across automotive temperature extremes. The device features an integrated source-drain diode with 0.85–1.2 V forward voltage and 40 ns reverse recovery time.

Dynamic parameters include 650–872 pF C_iss, 110–153 pF Cr_ss, and fast switching with 10 ns t_d(on), 62 ns t_r, 24 ns t_d(off), and 20 ns t_f. Internal inductances are specified as L_D = 2.5 nH and L_S = 7.5 nH, supporting predictable layout-dependent switching behavior.

Key Specifications

Pinout & Package

Package: SOT428 (DPAK), plastic single-ended surface-mounted package with 3 leads (lead 1 cropped), mounting base electrically connected to drain.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP55NF06L and IRFZ44NPBF, the BUK7237-55A trades some R_DS(on) and current rating for AEC-Q101 compliance, 175 °C operation, and superior thermal resistance via DPAK mounting base - making it optimal for space-constrained, thermally demanding automotive production designs.

Availability

BUK7237-55A is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V motor drives, and industrial solenoid actuation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BUK7237-55A 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

Nexperia is a global semiconductor expert focused on essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The BUK7237-55A belongs to Nexperia's TrenchMOS automotive-qualified power MOSFET family, engineered specifically for robust, high-efficiency switching in 12 V and 24 V automotive power networks.

FAQ

Is BUK7237-55A suitable for high-frequency PWM motor control?

Yes - with 10 ns turn-on delay, 62 ns rise time, and 24 ns turn-off delay, it supports PWM frequencies up to several hundred kHz in brushed DC motor control. Its 110–153 pF Cr_ss and 2.5 nH internal drain inductance help minimize Miller-induced shoot-through, especially when driven with ≤10 Ω gate resistance.

Does the mounting base require electrical isolation from the PCB?

No - the mounting base is electrically connected to the drain (Pin 2) and must be soldered directly to a large copper pour or heatsink. Isolation would impede thermal performance and violate the device's thermal design intent; use insulating thermal pads only if electrical isolation is absolutely required and thermal penalty is acceptable.

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

At T_mb = 100 °C, the continuous drain current is limited to 22.8 A per datasheet Figure 1. In the SOA curve (Figure 3), this corresponds to ~15 A at V_DS = 30 V for DC operation, decreasing to ~5 A at V_DS = 50 V due to thermal constraints - pulse operation extends limits based on pulse width and duty cycle.

Can BUK7237-55A replace older NXP BUK7237-55B in existing designs?

Yes - the BUK7237-55A is a direct replacement for BUK7237-55B with identical pinout, package, and electrical specifications. Revision 02 supersedes earlier versions and maintains full functional and mechanical compatibility, including AEC-Q101 qualification and thermal characteristics.