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

NXP Semiconductors BUK9618-55A,118

Name: BUK9618-55A,118
Brand: NXP Semiconductors
SKU: BUK9618-55A,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BUK9618-55A,118

Manufacturer:: NXP Semiconductors

Category:: FETs, MOSFETs

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: BUK9618-55A,118.pdf

Description:: MOSFET N-CH 55V 61A D2PAK

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Product details

Overview

BUK9618-55A from NXP Semiconductors (formerly Philips Semiconductors) is an N-channel TrenchMOS™ logic-level power MOSFET in SOT404 (D2-PAK) package, rated for 55 V drain-source voltage, 61 A DC drain current at T_mb = 25 °C and V_GS = 5 V, with typical R_DS(on) of 14 mΩ at V_GS = 5 V and 25 A. It serves as a high-current, low-loss switching element in automotive 12 V/24 V load control circuits.

For engineers reviewing the BUK9618-55A datasheet, BUK9618-55A pinout, BUK9618-55A application, or BUK9618-55A equivalent, this page delivers verified electrical specs, thermal performance data, mounting-base–referenced thermal resistance (R_th(j-mb) = 1.1 K/W), logic-level gate drive compatibility (V_GS(th) max 2.0 V), and validated alternatives for automotive power switching designs.

Technical Context

This device uses TrenchMOS™ technology to achieve low R_DS(on) while maintaining robust avalanche ruggedness (W_DSS = 127 mJ) and Q101 automotive qualification. Its gate threshold voltage (V_GS(th)) ranges from 1.0 V to 2.0 V at 25 °C, enabling reliable turn-on with standard 5 V or 4.5 V logic drivers.

The SOT404 package features a large mounting base electrically connected to the drain, supporting high-power dissipation (P_tot = 136 W at T_mb = 25 °C) and low junction-to-mounting-base thermal resistance (1.1 K/W). Internal source and drain inductances are specified separately for SOT404 (L_s = 7.5 nH, L_d = 2.5 nH).

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	55 V - Maximum continuous drain-source blocking voltage; suitable for 12 V/24 V automotive systems with load dump margin.
I_D (DC)	61 A at T_mb = 25 °C, V_GS = 5 V - High-current capability enables direct driving of motors, lamps, and solenoids without external amplification.
R_DS(on)	14 mΩ typ at V_GS = 5 V, I_D = 25 A, T_j = 25 °C - Low conduction loss reduces heat generation and improves system efficiency in high-duty-cycle switching.
T_j max	175 °C - Extended junction temperature rating supports operation in under-hood automotive environments without derating penalties.
R_th(j-mb)	1.1 K/W - Low thermal resistance from junction to mounting base enables effective heatsinking via PCB copper or external heatsink.
Q_g(tot)	34 nC - Total gate charge determines required driver current and switching speed; compatible with standard logic-level gate drivers.
V_GS(th)	1.5 V typ (1.0–2.0 V range) - Ensures full enhancement with 4.5 V–5 V microcontroller outputs, eliminating need for level-shifting circuitry.

Pinout & Package

SOT404 (D2-PAK) package with isolated leads and integral mounting base electrically tied to the drain terminal. Requires mechanical fastening to heatsink or thermally enhanced PCB plane.

Pin/Terminal	Circuit Role	Design Meaning
1	Gate (G)	Control input; accepts logic-level voltages (4.5 V–15 V); low input capacitance (C_iss = 1660 pF typ) minimizes driver loading.
2	Drain (D)	High-side power output node; internally connected to mounting base; must be electrically isolated from other system grounds unless configured as low-side switch.
3	Source (S)	Power return path; referenced to system ground in low-side configuration; internal source inductance (7.5 nH) affects switching waveform integrity.
Mounting Base (MB)	Drain (D)	Electrically and thermally connected to drain; provides primary thermal path and mechanical anchoring; requires insulating washer if mounted to grounded heatsink.

Key Features

Feature	Design Value
TrenchMOS™ technology	Enables 14 mΩ R_DS(on) at 55 V rating-superior conduction efficiency vs. planar MOSFETs in same voltage class.
AEC-Q101 qualified	Validated for automotive power electronics per stress test requirements-supports use in engine control, body electronics, and chassis modules.
Logic-level gate drive	V_GS(th) ≤ 2.0 V ensures full enhancement with 3.3 V/5 V MCU GPIOs-eliminates gate driver ICs in cost-sensitive applications.
175 °C junction rating	Permits operation in high-ambient environments (e.g., near engines or inverters) without thermal shutdown or significant R_DS(on) degradation.
Non-repetitive avalanche energy	127 mJ (W_DSS)-absorbs inductive kickback from solenoids/motors without external snubbers in many automotive load-switching scenarios.

Applications

Automotive Body Control Module (BCM)	12 V/24 V Industrial Load Switching
Use Scenario: Controlling headlamps, fog lamps, and interior lighting in modern BCMs with PWM dimming and diagnostics. IC Role / Device Role / Timing Role: High-side or low-side power switch managing up to 60 A lamp loads with short-circuit protection and thermal foldback. Use Value: Low R_DS(on) minimizes power loss and self-heating during extended illumination; logic-level gate simplifies integration with 5 V CAN/LIN microcontrollers.	Use Scenario: Driving industrial solenoids, pneumatic valves, and DC contactors in factory automation panels. IC Role / Device Role / Timing Role: Robust power switch handling repetitive inductive transients and high peak currents (I_DM = 246 A). Use Value: Avalanche ruggedness (127 mJ) and 175 °C rating ensure reliability across wide ambient temperature swings and unregulated supply conditions.
Automotive HVAC Blower Motor Control	Commercial Vehicle Starter Relay Replacement
Use Scenario: Variable-speed blower motor control in passenger car HVAC systems using PWM-based speed regulation. IC Role / Device Role / Timing Role: Low-side switching element interfaced with 5 V motor control MCU; handles continuous 43 A at T_mb = 100 °C. Use Value: R_DS(on) stability over temperature (36 mΩ max at 175 °C) maintains consistent torque and efficiency across full operating range.	Use Scenario: Solid-state replacement for electromechanical starter relays in trucks and buses, reducing contact wear and arcing. IC Role / Device Role / Timing Role: High-current, high-voltage switch controlling starter solenoid coil and main battery connection. Use Value: 55 V V_DS rating accommodates 24 V system load dump spikes; mounting base connection enables direct bolt-down to chassis ground for lowest possible inductance.

Automotive Body Control Module (BCM)

12 V/24 V Industrial Load Switching

Use Scenario: Controlling headlamps, fog lamps, and interior lighting in modern BCMs with PWM dimming and diagnostics.

IC Role / Device Role / Timing Role: High-side or low-side power switch managing up to 60 A lamp loads with short-circuit protection and thermal foldback.

Use Value: Low R_DS(on) minimizes power loss and self-heating during extended illumination; logic-level gate simplifies integration with 5 V CAN/LIN microcontrollers.

Use Scenario: Driving industrial solenoids, pneumatic valves, and DC contactors in factory automation panels.

IC Role / Device Role / Timing Role: Robust power switch handling repetitive inductive transients and high peak currents (I_DM = 246 A).

Use Value: Avalanche ruggedness (127 mJ) and 175 °C rating ensure reliability across wide ambient temperature swings and unregulated supply conditions.

Automotive HVAC Blower Motor Control

Commercial Vehicle Starter Relay Replacement

Use Scenario: Variable-speed blower motor control in passenger car HVAC systems using PWM-based speed regulation.

IC Role / Device Role / Timing Role: Low-side switching element interfaced with 5 V motor control MCU; handles continuous 43 A at T_mb = 100 °C.

Use Value: R_DS(on) stability over temperature (36 mΩ max at 175 °C) maintains consistent torque and efficiency across full operating range.

Use Scenario: Solid-state replacement for electromechanical starter relays in trucks and buses, reducing contact wear and arcing.

IC Role / Device Role / Timing Role: High-current, high-voltage switch controlling starter solenoid coil and main battery connection.

Use Value: 55 V V_DS rating accommodates 24 V system load dump spikes; mounting base connection enables direct bolt-down to chassis ground for lowest possible inductance.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP60NF06L	60 V V_DS, 60 A I_D, R_DS(on) = 14 mΩ @ V_GS = 10 V (not 5 V); TO-220 package; no Q101 qualification.	Requires 10 V gate drive for rated R_DS(on); not automotive-qualified; higher gate charge (Q_g = 65 nC) slows switching.	Acceptable for non-automotive 24 V industrial switching where gate drive voltage ≥10 V is available and qualification is not required.
IRF1404ZLPBF	40 V V_DS, 200 A I_D, R_DS(on) = 3.7 mΩ @ V_GS = 10 V; TO-220AB; no logic-level rating (V_GS(th) = 2–4 V); not Q101 qualified.	Lower voltage rating limits use to 12 V systems only; higher current rating overshoots typical BUK9618-55A applications; gate threshold less predictable at 4.5 V.	Only suitable for high-current 12 V applications where V_DS margin is sufficient and automotive qualification is unnecessary.

Compared with STP60NF06L and IRF1404ZLPBF, the BUK9618-55A uniquely combines 55 V rating, true logic-level gate (≤2 V V_GS(th)), AEC-Q101 qualification, and SOT404 thermal performance-making it the only drop-in solution for automotive 24 V load switching requiring zero gate-level translation and guaranteed reliability.

Availability

BUK9618-55A is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor control, and commercial vehicle power distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for BUK9618-55A 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, formerly Philips Semiconductors, is a global leader in high-performance analog and power semiconductor solutions, with deep expertise in automotive-grade components and industrial power management.

The BUK9618-55A belongs to NXP's TrenchMOS™ logic-level FET product line, engineered specifically for robust, efficient, and qualification-ready power switching in automotive 12 V/24 V systems and demanding industrial environments.

FAQ

What is the maximum continuous drain current for BUK9618-55A at 100 °C mounting base temperature?

The BUK9618-55A supports 43 A continuous drain current at T_mb = 100 °C and V_GS = 5 V, as specified in Table 3 (Limiting values). This derating reflects thermal constraints of the SOT404 package and ensures safe operation within its 175 °C junction limit. The BUK9618-55A maintains usable conduction performance even in high-temperature under-hood locations.

Is BUK9618-55A pin-compatible with BUK9518-55A?

No, BUK9618-55A is not pin-compatible with BUK9518-55A. While both share identical pin functions (gate, drain, source), BUK9518-55A uses SOT78 (TO-220AB) with through-hole leads, whereas BUK9618-55A uses SOT404 (D2-PAK) with surface-mount leads and a different mechanical footprint. PCB layout and thermal interface design must be revised when substituting BUK9618-55A for BUK9518-55A.

Does BUK9618-55A require a gate resistor for safe switching?

Yes, a gate resistor is recommended for BUK9618-55A to control dV/dt and prevent oscillation during switching. With Q_g(tot) = 34 nC and fast turn-on/turn-off times (t_d(on) = 21 ns, t_f = 97 ns), uncontrolled gate drive can cause ringing or shoot-through in half-bridge configurations. Typical values range from 5 Ω to 47 Ω depending on driver strength and EMI requirements. The BUK9618-55A datasheet specifies test conditions using R_G = 10 Ω.

What is the avalanche energy rating of BUK9618-55A and how is it tested?

The BUK9618-55A has a non-repetitive avalanche energy rating (W_DSS) of 127 mJ, measured under unclamped inductive load conditions: I_D = 61 A, V_DS ≤ 55 V, V_GS = 5 V, R_GS = 50 Ω, and starting T_mb = 25 °C. This rating validates its ability to absorb single-event inductive transients-such as those from solenoid de-energization-without failure. The BUK9618-55A is not rated for repetitive avalanche operation.

Can BUK9618-55A be used in high-side switching configurations?

Yes, BUK9618-55A can be used in high-side switching, but requires a gate drive voltage referenced to the source (i.e., floating or bootstrap gate driver) since its gate must be driven 4.5–15 V above the source potential. The mounting base is internally connected to the drain, so mechanical mounting must isolate the heatsink from system ground unless the drain node is at ground potential. In high-side use, the BUK9618-55A's logic-level threshold still applies relative to its source.

BUK9618-55A,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: TrenchMOS™

Package/Case:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 55 V

Current - Continuous Drain (Id) @ 25°C:: 61A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 16mOhm @ 25A, 10V

Vgs(th) (Max) @ Id:: 2V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 34 nC @ 5 V

Vgs (Max):: ±15V

Input Capacitance (Ciss) (Max) @ Vds:: 2210 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 136W (Tc)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: D2PAK

BUK9618-55A,118 FAQ

1.How can I place an order for BUK9618-55A,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK9618-55A,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 BUK9618-55A,118 reliable?

The price and inventory of BUK9618-55A,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9618-55A,118 is usually 5 days.

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BUK9618-55A,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK9618-55A,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 BUK9618-55A,118?

For technical support, including BUK9618-55A,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9618-55A,118 requirements.

6.How does Aetrix verify that BUK9618-55A,118 is sourced from the original manufacturer or authorized distributors?

All BUK9618-55A,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 BUK9618-55A,118 meets industry standards.

7.What is the process for return or replacement of BUK9618-55A,118?

All BUK9618-55A,118 units undergo pre-shipment inspection (PSI). If there is an issue with BUK9618-55A,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 BUK9618-55A,118 part is unused and in its original packaging.

Return procedure for BUK9618-55A,118:

1.Submit a request within 90 days.

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

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