Nexperia USA Inc. BUK9K49-80LX

Overview

BUK9K49-80L from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated for 80 V drain-source voltage, 49 mΩ R_DS(on) at V_GS = 4.5 V and T_j = 25 °C, and qualified to AEC-Q101 for automotive use up to 175 °C junction temperature. It integrates two trench-based silicon dies for space-efficient motor, lighting, and transmission control in 12 V/24 V/48 V systems.

For engineers reviewing the BUK9K49-80L datasheet, BUK9K49-80L pinout, BUK9K49-80L application, or BUK9K49-80L equivalent, this page delivers verified electrical parameters, dual-die thermal behavior, side-wettable flanks packaging details, and AEC-Q101-compliant switching performance under real automotive thermal and avalanche stress conditions.

Technical Context

This dual MOSFET uses Nexperia's Trench12 technology to achieve low R_DS(on) with soft body-diode recovery-critical for reducing EMI and voltage spikes in inductive load switching. Its gate threshold voltage (V_GS(th)) ranges from 0.5 V (T_j = 175 °C) to 2.45 V (T_j = −55 °C), enabling robust logic-level drive across automotive temperature extremes.

The device features identical FET1 and FET2 channels with matched dynamic characteristics: Q_G(tot) = 12 nC typ at V_GS = 10 V, Q_GD = 1.6 nC typ, and C_iss = 734 pF typ-supporting fast, controlled switching in high-frequency PWM circuits while maintaining avalanche ruggedness (E_AS = 25.7 mJ).

Key Specifications

Pinout & Package

LFPAK56D (SOT1205) is a dual-die, single-ended surface-mount package with side-wettable flanks for automated optical inspection and solder-joint reliability. Dimensions: 4.95 mm × 5.30 mm × 1.02 mm (L × W × H), with 8 leads and exposed mounting base for thermal transfer.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BSC028N06NS3 and NTMFS5C675NL, the BUK9K49-80L uniquely combines dual-channel integration, 80 V capability, side-wettable flanks, and full AEC-Q101 qualification-making it the only option that satisfies space-constrained, thermally demanding, and safety-critical automotive power switching requirements in one package.

Availability

BUK9K49-80L is available at Aetrix Electronics and suitable for automotive motor control, LED lighting systems, transmission solenoid drivers, and circuit protection modules requiring stable component supply across long production lifecycles.

Supply support for BUK9K49-80L 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, ESD protection, and logic ICs.

The BUK9K49-80L belongs to Nexperia's LFPAK automotive MOSFET family, engineered specifically for space-constrained, thermally aggressive automotive power switching applications requiring AEC-Q101 compliance and robust manufacturability.

FAQ

What is the maximum continuous drain current for each channel of the BUK9K49-80L?

Each channel supports 17 A continuous drain current at T_mb = 25 °C, as demonstrated in application testing. Real-world current capability depends on PCB copper area, thermal interface resistance, and ambient temperature-derating to 12 A is recommended at T_mb = 100 °C per Figure 2 of the datasheet.

Does the BUK9K49-80L require a gate driver when driven by a 3.3 V microcontroller?

No external gate driver is required: V_GS(th) is as low as 0.5 V at 175 °C, and R_DS(on) remains 113 mΩ typical at V_GS = 4.5 V and T_j = 175 °C. A 3.3 V GPIO can fully enhance both channels, though layout must minimize gate loop inductance to avoid ringing.

How does the side-wettable flank feature improve manufacturing yield?

Side-wettable flanks expose solderable metal along the package edges, enabling automated optical inspection (AOI) to verify solder fillet formation and joint completeness-reducing field failures from voided or insufficient solder joints in high-vibration automotive environments.

Can the BUK9K49-80L be used in back-to-back configuration for AC switching?

Yes: the dual N-channel structure allows back-to-back connection (sources tied together, drains as AC terminals) for solid-state relay functionality. Each channel blocks 80 V in either direction, and matched R_DS(on) ensures symmetrical conduction-ideal for 24 V/48 V DC-AC inverters and bidirectional power switches.