Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Nexperia USA Inc. BUK7905-40AI,127

Name: BUK7905-40AI,127
Brand: Nexperia USA Inc.
SKU: BUK7905-40AI,127
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: BUK7905-40AI,127

Manufacturer:: Nexperia USA Inc.

Category:: FETs, MOSFETs

Package:: TO-220-5

Datasheet:: BUK7905-40AI,127.pdf

Description:: MOSFET N-CH 40V 75A TO220-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:5,620

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

BUK7905-40AI from Nexperia is a standard-level N-channel TrenchPLUS MOSFET with integrated current sensing, designed for automotive-critical power switching in high-current, thermally demanding environments. It delivers 40 V V_DS, 155 A continuous drain current at T_mb = 25 °C, and 4.5 mΩ R_DS(on) at V_GS = 10 V and T_j = 25 °C, enabling efficient EPAS and variable valve timing actuation.

For engineers reviewing the BUK7905-40AI datasheet, BUK7905-40AI pinout, BUK7905-40AI application, or BUK7905-40AI equivalent, key selection criteria include its Kelvin-source layout for accurate current sensing, AEC-Q101 qualification, TO-220 SOT263B package thermal performance (R_th(j-mb) = 0.55 K/W), and 500:1 ID/Isense ratio stability across -55 °C to 175 °C junction temperature.

Technical Context

This device implements TrenchMOS technology with dedicated ISENSE and Kelvin source (KS) terminals to decouple sense path resistance from main current conduction, minimizing measurement error under high di/dt conditions. Its gate threshold voltage (V_GS(th)) ranges from 2 V to 4 V at 25 °C and remains functional down to 1 V at 175 °C, supporting robust turn-on across automotive temperature extremes.

The MOSFET features unclamped avalanche ruggedness (E_DS(AL)S = 1.46 J at ID = 75 A), low internal inductances (L_D = 2.5 nH, L_S = 7.5 nH), and optimized dynamic parameters - including Q_G(tot) = 120 nC and C_iss = 4300 pF - to support fast, stable switching in motor control and load management circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	40 V maximum drain-source voltage - defines safe blocking capability in 12 V/24 V automotive systems with transient overvoltage margin.
R_DS(on)	4.5 mΩ typical at V_GS = 10 V, I_D = 50 A, T_j = 25 °C - enables <1 W conduction loss at 100 A, critical for thermal management in EPAS modules.
ID/Isense	500:1 nominal ratio - provides precise proportional current monitoring without external shunt, reducing BOM count and PCB area in closed-loop motor control.
R_th(j-mb)	0.55 K/W - allows direct heatsink mounting with predictable junction-to-base thermal drop, simplifying thermal design for high-power density applications.
E_DS(AL)S	1.46 J unclamped avalanche energy - ensures survivability during inductive load turn-off transients without external snubbers in valve actuation drivers.
V_ESD	4 kV HBM - meets automotive ESD immunity requirements for assembly and field operation in harsh vehicle environments.

Pinout & Package

Package: TO-220 plastic single-ended package (SOT263B), heatsink-mounted with one mounting hole and five leads. Mounting base (mb) is electrically connected to drain (D).

Pin/Terminal	Circuit Role	Design Meaning
1 - G	Gate	Control input for MOSFET channel activation; requires 10 V drive for full enhancement and minimal R_DS(on).
2 - ISENSE	Current Sense Output	Provides scaled replica of drain current (ID/Isense = 500); isolated from power path to avoid voltage drop errors.
3 - D	Drain	Main high-side power terminal; electrically tied to mounting base for direct heatsink coupling and thermal conduction.
4 - KS	Kelvin Source	Low-inductance reference return for sense circuitry; separates measurement ground from high-current source return path.
5 - S	Source	Main power return path; carries full load current and connects to system ground or low-side switch node.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive safety-critical applications including EPAS and engine timing, ensuring reliability over 15+ year vehicle lifetimes.
TrenchPLUS current sensing	Integrated, factory-trimmed current mirror eliminates need for external shunt resistors and associated layout complexity or power loss.
Standard-level gate drive	Operates fully enhanced with 10 V gate drive - compatible with common microcontroller GPIOs and automotive gate drivers without level-shifting.
Low R_DS(on) × Q_G figure-of-merit	4.5 mΩ × 120 nC = 540 mΩ·nC - balances conduction efficiency and switching speed for high-frequency PWM motor control up to 20 kHz.

Applications

Electrical Power Assisted Steering (EPAS)

Variable Valve Timing (VVT)

Use Scenario: High-current bidirectional motor driver in column-assist or rack-assist EPAS systems requiring real-time torque feedback and fault detection.

IC Role / Device Role / Timing Role: Main power switch controlling 12–48 V brushed or BLDC assist motors; ISENSE output feeds current loop controller for torque regulation.

Use Value: Kelvin-source architecture enables <±2% current measurement accuracy under 500 A/µs di/dt, improving steering responsiveness and reducing sensor drift vs. shunt-based solutions.

Use Scenario: Solenoid actuator driver in cam phasing systems, where precise oil flow control adjusts intake/exhaust valve timing dynamically.

IC Role / Device Role / Timing Role: High-side switch delivering pulsed 12 V/20 A bursts to hydraulic solenoids; avalanche rating handles inductive kickback without clamping diodes.

Use Value: 1.46 J avalanche energy rating permits reliable 100% duty-cycle operation during extended dwell periods, eliminating external protection components.

Electric Turbocharger Actuation

12 V/24 V DC-DC Converter Primary Switch

Use Scenario: Driving high-inertia turbo vanes in 48 V mild-hybrid architectures, demanding high peak current and thermal resilience.

IC Role / Device Role / Timing Role: Low-side synchronous rectifier or high-side main switch in vane position control H-bridge; mounted directly to aluminum chassis for thermal dissipation.

Use Value: R_th(j-mb) = 0.55 K/W enables junction temperatures ≤125 °C at 100 A continuous, extending service life beyond 10,000 operating hours.

Use Scenario: Primary switching element in isolated 12 V → 48 V bidirectional DC-DC converters for 48 V belt-driven starter generators (BSG).

IC Role / Device Role / Timing Role: High-efficiency power stage switch operating at 100–200 kHz; leverages low C_iss/C_oss for ZVS compatibility and reduced switching loss.

Use Value: 4300 pF C_iss and 1400 pF C_oss support soft-switching topologies, cutting switching losses by ≥30% versus comparable discrete MOSFETs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current automotive MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL220N4F7AG	40 V, 220 A, R_DS(on) = 2.2 mΩ @ 10 V, no integrated current sense, PowerFLAT 5x6 package	Lacks ISENSE/KS terminals - requires external shunt and amplification for current feedback; better suited for space-constrained non-sensing applications.	Select when board area is constrained and current sensing is handled externally; verify thermal interface for 220 A rating in TO-220 footprint mismatch.
IRFP4868PBF	60 V, 120 A, R_DS(on) = 5.2 mΩ @ 10 V, no current sense, TO-247 package, lower Q_G (95 nC)	Higher V_DS rating trades off conduction loss for wider voltage margin; larger TO-247 footprint increases PCB cost and thermal spread resistance.	Choose for 42 V battery systems or legacy designs needing higher voltage headroom; not AEC-Q101 qualified - unsuitable for new automotive programs.

Compared with STL220N4F7AG and IRFP4868PBF, BUK7905-40AI uniquely combines AEC-Q101 compliance, integrated current sensing, and TO-220 thermal performance - making it the only option among the three that satisfies both functional safety and BOM reduction requirements in EPAS and VVT.

Availability

BUK7905-40AI is available at Aetrix Electronics and suitable for Electrical Power Assisted Steering (EPAS), Variable Valve Timing (VVT), and 48 V mild-hybrid actuation systems requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.

Supply support for BUK7905-40AI 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 specializing in high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified MOSFETs, ESD protection, and logic ICs.

BUK7905-40AI belongs to Nexperia's TrenchPLUS automotive MOSFET product line, engineered specifically for high-current, high-temperature power switching in safety-critical vehicle subsystems such as steering, braking, and engine control.

FAQ

What is the purpose of the KS (Kelvin Source) pin on the BUK7905-40AI?

The KS pin provides a dedicated, low-inductance return path for the current sense circuitry, isolating the voltage reference from high di/dt effects in the main source lead. This ensures accurate Isense signal fidelity by eliminating IR drop and inductive coupling errors - critical for closed-loop motor current control in EPAS systems.

Can the BUK7905-40AI be used in a high-side switching configuration?

Yes - its standard-level gate drive (V_GS(th) = 2–4 V, fully enhanced at 10 V) and drain-connected mounting base support high-side operation with appropriate gate driver biasing. The 40 V V_DS rating and 1.46 J avalanche energy make it suitable for inductive high-side loads like solenoids in VVT actuators.

How does the ID/Isense ratio vary with temperature and gate voltage?

The ID/Isense ratio is specified as 450–550 over T_j = −55 °C to 175 °C and V_GS > 10 V, with typical value 500. Figure 15 shows <±2% variation across this range, confirming stable scaling for precision current monitoring without software calibration across full automotive temperature and drive conditions.

Is the mounting base (mb) electrically isolated from other pins?

No - the mounting base is internally connected to the drain (pin 3) per the datasheet and package outline. This design enables direct thermal coupling to the heatsink while maintaining electrical continuity with the drain node, requiring proper insulation between heatsink and system ground in high-side configurations.

BUK7905-40AI,127 Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: TrenchMOS™

Package/Case:: TO-220-5

Packaging:: Tube

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 40 V

Current - Continuous Drain (Id) @ 25°C:: 75A (Tc)

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

Rds On (Max) @ Id, Vgs:: 5mOhm @ 50A, 10V

Vgs(th) (Max) @ Id:: 4V @ 1mA

Gate Charge (Qg) (Max) @ Vgs:: 127 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 5000 pF @ 25 V

FET Feature:: Current Sensing

Power Dissipation (Max):: 272W (Tc)

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Through Hole

Supplier Device Package:: TO-220-5

BUK7905-40AI,127 FAQ

1.How can I place an order for BUK7905-40AI,127 through Aetrix?

Please submit a Request for Quotation (RFQ) for BUK7905-40AI,127 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 BUK7905-40AI,127 reliable?

The price and inventory of BUK7905-40AI,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7905-40AI,127 is usually 5 days.

3.What payment methods are accepted for BUK7905-40AI,127?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK7905-40AI,127 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BUK7905-40AI,127?

BUK7905-40AI,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BUK7905-40AI,127 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 BUK7905-40AI,127?

For technical support, including BUK7905-40AI,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7905-40AI,127 requirements.

6.How does Aetrix verify that BUK7905-40AI,127 is sourced from the original manufacturer or authorized distributors?

All BUK7905-40AI,127 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 BUK7905-40AI,127 meets industry standards.

7.What is the process for return or replacement of BUK7905-40AI,127?

All BUK7905-40AI,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7905-40AI,127, 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 BUK7905-40AI,127 part is unused and in its original packaging.

Return procedure for BUK7905-40AI,127:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…