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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

Nexperia USA Inc. BUK6218-40C,118

Name: BUK6218-40C,118
Brand: Nexperia USA Inc.
SKU: BUK6218-40C,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK6218-40C,118

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: BUK6218-40C,118.pdf

Description:: MOSFET N-CH 40V 42A DPAK

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Inventory:3,510

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Product details

Overview

BUK6218-40C,118 from Nexperia is an AEC-Q101 qualified N-channel TrenchMOS FET in DPAK (SOT428) package, designed for automotive power switching with 40 V V_DS, 42 A continuous drain current at 25 °C mounting base temperature, and 13.5 mΩ typical R_DS(on) at V_GS = 10 V - deployed in electric power steering and start-stop micro-hybrid systems.

For engineers reviewing the BUK6218-40C,118 datasheet, BUK6218-40C,118 pinout, BUK6218-40C,118 application, or BUK6218-40C,118 equivalent, this part supports thermally demanding 12 V automotive subsystems requiring 175 °C junction-rated ruggedness, intermediate-level gate drive compatibility, and unclamped avalanche energy handling up to 25 mJ.

Technical Context

This FET uses TrenchMOS technology to achieve low on-resistance and fast switching with verified dynamic parameters: 7.7 nC Q_GD, 22 nC Q_G(tot), and 20.8 ns rise time under 30 V V_DS/10 Ω gate resistance conditions. Its gate threshold voltage ranges from 0.8 V at 175 °C to 3.3 V at –55 °C, enabling stable turn-on across automotive thermal extremes.

The device integrates a robust intrinsic body diode with 34 ns reverse recovery time and 35.9 nC recovered charge, while thermal resistance from junction to mounting base is specified at 2.52 K/W - critical for conduction loss management in high-current motor and solenoid drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum - defines safe blocking capability in 12 V automotive battery-supplied circuits with load dump transients.
I_D (continuous)	42 A at T_mb = 25 °C - enables direct driving of high-current loads like EPS motors without external heatsinking at ambient conditions.
R_DS(on)	13.5 mΩ typ. at V_GS = 10 V, I_D = 10 A, T_mb = 25 °C - limits conduction loss to ≤5.7 W at 20 A, supporting efficient thermal design.
Q_GD	7.7 nC - determines Miller plateau duration during switching, directly impacting turn-off energy and EMI in PWM-controlled solenoids.
E_AS	25 mJ non-repetitive avalanche energy - provides single-pulse fault tolerance during inductive load interruption without external snubbers.
T_j max	175 °C - allows operation in engine bay environments where ambient temperatures exceed 125 °C with derated current.
R_th(j-mb)	2.52 K/W - quantifies thermal path efficiency from die to PCB copper pad, enabling accurate junction temperature estimation under real load profiles.

Pinout & Package

Package: SOT428 (DPAK), plastic surface-mount package with 3 leads (one lead cropped); mounting base (mb) electrically connected to drain for low-inductance thermal and power path routing.

Pin/Terminal	Circuit Role	Design Meaning
1 (G)	Gate	Control terminal accepting standard or logic-level gate drive (V_GS(th) = 1.8–2.8 V); requires <100 nA leakage current budget at 25 °C.
2 (D)	Drain	Main high-side power terminal; internally bonded to mounting base for low-impedance heat transfer and minimized source inductance (L_S = 7.5 nH).
3 (S)	Source	Power return path and reference for gate drive; forms low-inductance loop with gate and drain terminals for fast switching stability.
Mounting Base (mb)	Drain extension	Exposed copper pad soldered to PCB thermal plane; carries full drain current and dissipates >95% of P_tot (60 W max) via conduction.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive safety-critical applications including EPS and transmission control per stress test requirements.
175 °C junction rating	Enables uninterrupted operation in under-hood locations where ambient exceeds 125 °C, with guaranteed R_DS(on) stability up to T_j = 175 °C.
Intermediate gate drive compatibility	Operates reliably with both 5 V logic-level and 10–12 V standard automotive gate drivers due to V_GS(th) range and low Q_G.
Low internal inductance	L_D = 3.5 nH and L_S = 7.5 nH minimize voltage overshoot and ringing during 168 A peak current switching events.
Body diode with controlled recovery	t_rr = 34 ns and Q_r = 35.9 nC reduce switching losses and EMI in freewheeling paths of brushed DC motor drives.

Applications

Electric Power Steering (EPS)

Start-Stop Micro-Hybrid Systems

Use Scenario: High-current H-bridge phase leg switching for brushless EPS motor control under transient torque demand up to 42 A.

IC Role / Device Role / Timing Role: Low-side or high-side power switch managing bidirectional motor current with <20 ns rise/fall times to minimize dead-time losses.

Use Value: 13.5 mΩ R_DS(on) reduces conduction loss by ≥35% versus comparable 40 V MOSFETs, extending battery runtime and reducing thermal pad area.

Use Scenario: Load switch controlling 12 V battery-fed auxiliary systems (e.g., HVAC blower, fuel pump) during engine cranking and restart cycles.

IC Role / Device Role / Timing Role: Robust main power switch with 25 mJ avalanche capability to absorb inductive kickback from relay coils and solenoids.

Use Value: 175 °C T_j rating ensures reliable operation during sustained cranking events where PCB temperature rises above 100 °C.

Transmission Control Solenoids

LED Headlamp Dimming Drivers

Use Scenario: PWM-driven proportional pressure control solenoids in 8-speed automatic transmissions requiring precise current regulation up to 30 A.

IC Role / Device Role / Timing Role: Fast-switching power stage with 7.7 nC Q_GD enabling clean 1–20 kHz PWM edges and minimal gate drive power consumption.

Use Value: 2.52 K/W R_th(j-mb) allows direct thermal coupling to chassis ground, eliminating need for discrete thermal interface materials in space-constrained valve bodies.

Use Scenario: High-side current sink for adaptive LED headlamp matrix modules requiring 0–42 A dynamic current control with low thermal drift.

IC Role / Device Role / Timing Role: Thermally stable current regulator using R_DS(on) as sense element, leveraging <0.02 µA IDSS at 25 °C for precision biasing.

Use Value: V_GS(th) shift of only +0.5 V from –40 °C to 125 °C ensures consistent turn-on behavior across automotive temperature range without recalibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 220 A rated, but in LFPAK56 package; R_DS(on) = 1.6 mΩ @ 10 V - significantly lower on-resistance but higher gate charge (Q_G = 95 nC).	Better suited for high-frequency, high-efficiency traction inverters; less optimal for thermally constrained EPS housings due to larger footprint.	Select when system prioritizes conduction loss reduction over gate drive simplicity and thermal pad area.
IRF1404ZLPbF	40 V, 195 A, TO-220 package; R_DS(on) = 3.7 mΩ @ 10 V but no AEC-Q101 qualification; T_j max = 175 °C.	Acceptable for non-safety-critical industrial motor controls; not approved for automotive functional safety domains.	Choose only for cost-sensitive non-automotive applications where qualification compliance is not required.

Compared with STL220N4F7AG and IRF1404ZLPbF, the BUK6218-40C,118 uniquely balances AEC-Q101 compliance, DPAK thermal efficiency, and intermediate gate drive compatibility - making it optimal for space- and reliability-constrained automotive subsystems where qualification and thermal management are co-primary constraints.

Availability

BUK6218-40C,118 is available at Aetrix Electronics and suitable for electric power steering, start-stop micro-hybrid control, and transmission solenoid actuation requiring stable component supply across automotive production lifecycles.

Supply support for BUK6218-40C,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 essential semiconductors, delivering high-performance, reliable components for automotive, industrial, and consumer markets.

The BUK6218-40C,118 belongs to Nexperia's TrenchMOS automotive-qualified power MOSFET product line, engineered specifically for high-reliability 12 V automotive power switching in safety-critical subsystems.

FAQ

What is the maximum continuous drain current for BUK6218-40C,118 at 100 °C mounting base temperature?

The maximum continuous drain current is 30 A at T_mb = 100 °C, as specified in Table 4 (Limiting Values). This derating reflects thermal constraints of the DPAK package and ensures junction temperature remains ≤175 °C under steady-state conduction.

Does BUK6218-40C,118 support logic-level gate drive (e.g., 5 V MCU output)?

Yes - its gate-source threshold voltage is 1.8–2.8 V at 25 °C, and R_DS(on) remains 20.7–28 mΩ at V_GS = 4.5 V/5 V, enabling direct drive from 5 V microcontrollers without level-shifting circuitry.

How is avalanche ruggedness characterized for this MOSFET?

It is rated for 25 mJ non-repetitive drain-source avalanche energy (E_AS) under unclamped inductive switching conditions (I_D = 42 A, V_sup ≤ 40 V, V_GS = 10 V, T_j(init) = 25 °C), validated per AEC-Q101 stress test requirements.

What is the thermal resistance from junction to mounting base, and how is it measured?

R_th(j-mb) is 2.52 K/W, measured per JEDEC JESD51-14 standards using transient thermal impedance methods (Figure 4). It represents the dominant thermal path from silicon die to the soldered mounting base, excluding PCB conduction effects.

BUK6218-40C,118 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 42A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 10V

Rds On (Max) @ Id, Vgs:: 16mOhm @ 10A, 10V

Vgs(th) (Max) @ Id:: 2.8V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 22 nC @ 10 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 1170 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 60W (Tc)

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

BUK6218-40C,118 FAQ

1.How can I place an order for BUK6218-40C,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK6218-40C,118 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for BUK6218-40C,118 reliable?

The price and inventory of BUK6218-40C,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK6218-40C,118 is usually 5 days.

3.What payment methods are accepted for BUK6218-40C,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK6218-40C,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK6218-40C,118?

BUK6218-40C,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK6218-40C,118 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for BUK6218-40C,118?

For technical support, including BUK6218-40C,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK6218-40C,118 requirements.

6.How does Aetrix verify that BUK6218-40C,118 is sourced from the original manufacturer or authorized distributors?

All BUK6218-40C,118 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BUK6218-40C,118 meets industry standards.

7.What is the process for return or replacement of BUK6218-40C,118?

All BUK6218-40C,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK6218-40C,118, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The BUK6218-40C,118 part is unused and in its original packaging.

Return procedure for BUK6218-40C,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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