Nexperia USA Inc. BUK7640-100A,118

Overview

BUK7640-100A,118 from Nexperia is a standard-level N-channel TrenchMOS FET in D2PAK (SOT404) package, designed for automotive-critical power switching with 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. It delivers low conduction loss and unclamped avalanche ruggedness of 31 mJ, supporting robust operation in engine control modules and battery disconnect circuits.

For engineers reviewing the BUK7640-100A,118 datasheet, BUK7640-100A,118 pinout, BUK7640-100A,118 application, or BUK7640-100A,118 equivalent, key selection criteria include AEC-Q101 qualification, thermal resistance of 1.1 K/W (junction-to-mounting base), gate threshold voltage range of 2–4 V, and safe operating area validated up to 149 A peak drain current under pulsed conditions.

Technical Context

This device employs TrenchMOS technology to achieve low on-resistance and high avalanche energy capability. Its gate threshold voltage (2–4 V at T_j = 25 °C) enables direct drive from 3.3 V and 5 V microcontrollers, while its 100 V V_DS rating supports 48 V automotive systems and 24 V industrial rails.

The integrated source-drain diode exhibits 0.85–1.2 V forward voltage at 25 A and 25 °C, with 70 ns reverse recovery time and 0.24 µC recovered charge-critical for synchronous rectification and inductive load switching where body diode conduction occurs during dead-time.

Key Specifications

Pinout & Package

Package: SOT404 (D2PAK), plastic single-ended surface-mounted package with exposed mounting base electrically connected to drain. Dimensions: 15.8 × 10.3 × 4.5 mm (L × W × H); 3 leads (lead 1 cropped).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STP110N10F7 and IRF3205PBF, BUK7640-100A,118 uniquely combines AEC-Q101 qualification, 100 V rating, and 31 mJ avalanche energy in a thermally optimized D2PAK package-making it the only drop-in solution for space-constrained, safety-critical automotive power nodes requiring zero external protection components.

Availability

BUK7640-100A,118 is available at Aetrix Electronics and suitable for automotive engine control, HVAC motor drives, and battery disconnect systems requiring stable component supply across multi-year production programs.

Supply support for BUK7640-100A,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 and logic devices, with leadership in automotive-qualified MOSFETs and ESD protection solutions.

The BUK7640-100A belongs to Nexperia's TrenchMOS automotive power portfolio, engineered specifically for under-hood applications demanding AEC-Q101 compliance, high avalanche robustness, and low R_DS(on) in compact surface-mount packages.

FAQ

Is BUK7640-100A,118 suitable for high-frequency PWM applications above 100 kHz?

Yes - with 12–18 ns turn-on delay and 30–42 ns fall time at V_GS = 10 V and T_j = 25 °C, it supports switching frequencies up to 250 kHz in hard-switched topologies. However, gate drive strength must exceed 1 A peak to minimize switching losses, and PCB layout must minimize source inductance (<7.5 nH) to avoid oscillation.

What is the maximum allowable mounting base temperature for continuous 37 A operation?

The datasheet specifies 37 A only at T_mb = 25 °C. At T_mb = 100 °C, the absolute maximum continuous drain current drops to 26 A per Table 4. For 37 A sustained operation, active cooling or forced convection is required to maintain T_mb ≤ 25 °C, or derating to 26 A must be applied.

Does the mounting base require electrical isolation from the heatsink?

No - the mounting base is internally connected to the drain terminal (Pin 2). If used in high-side configuration or where drain is at elevated potential, the heatsink must be electrically isolated using mica or ceramic washers. In low-side configurations, the heatsink may be grounded directly.

Can BUK7640-100A,118 replace older BUK7640-100B variants in existing designs?

Yes - both share identical pinout, package (SOT404), and electrical specifications. The ",118" suffix denotes tape-and-reel packaging per JEDEC standard; no functional or parametric differences exist between -100A and -100B revisions per Nexperia's revision history and product change notices.