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Nexperia USA Inc. BUK7908-40AIE,127
- Part No.:
- BUK7908-40AIE,127
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- TO-220-5
- Datasheet:
-
BUK7908-40AIE,127.pdf
- Description:
- MOSFET N-CH 40V 75A TO220-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,540
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Product details
Overview
BUK7908-40AIE from Nexperia is an AEC-Q101-qualified N-channel TrenchPLUS standard-level MOSFET in TO-220 (SOT263B) package, designed for automotive power switching. It features integrated current sensing (ID/Isense = 500 ±50), low RDS(on) of 6 mΩ @ 10 V/50 A/25 °C, and built-in ESD protection diodes. Used in Electrical Power Assisted Steering (EPAS) and Variable Valve Timing systems where high-current, robust gate drive and real-time current monitoring are required.
For engineers reviewing the BUK7908-40AIE datasheet, BUK7908-40AIE pinout, BUK7908-40AIE application, or BUK7908-40AIE equivalent, this page delivers verified specifications, validated pin functions, automotive-grade thermal and avalanche performance data, and direct alternatives for EPAS and engine timing control designs.
Technical Context
This device implements a Kelvin-source (KS) configuration with dedicated sense terminal (ISENSE) to decouple current-sensing path from high-current source return, enabling accurate closed-loop motor current control without voltage drop interference. Its TrenchMOS architecture delivers stable RDS(on) over temperature (15.2 mΩ max @ 175 °C) and supports standard-level 10 V gate drive.
The integrated ESD protection diodes provide 6 kV HBM robustness, while its unclamped avalanche energy rating (0.63 J at 75 A) ensures survivability during inductive load switching transients common in steering motor drivers. Mounting base (mb) is internally connected to drain, requiring isolation from heatsink unless system-level drain-referenced thermal design is implemented.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 40 V maximum - defines safe operating voltage ceiling for 12 V/24 V automotive battery rail applications with transient margin. |
| RDS(on) | 6 mΩ typical @ 10 V/50 A/25 °C - enables <1 W conduction loss at 50 A, critical for thermally constrained EPAS modules. |
| ID / Isense ratio | 500 ±50 - provides precise proportional current mirroring for analog feedback without external shunt or op-amp circuitry. |
| QG(tot) | 78 nC typical - determines gate driver power requirement and switching speed in PWM-controlled motor phases. |
| EAS | 0.63 J unclamped avalanche energy - guarantees single-pulse ruggedness during flyback events in inductive steering motor windings. |
| Rth(j-mb) | 0.68 K/W - quantifies thermal path efficiency from die to mounting base, enabling accurate junction temperature estimation under heatsink-limited conditions. |
| VGS(th) | 2–4 V @ 25 °C - ensures reliable turn-on with standard 5 V or 10 V microcontroller GPIO or gate driver outputs. |
Pinout & Package
Package: TO-220 plastic single-ended package (SOT263B), heatsink-mounted with 1 mounting hole and 5 leads. Mounting base (mb) is electrically connected to drain.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - G | Gate | Standard MOSFET gate input; accepts 10 V logic-level drive; clamped to ±20 V absolute max. |
| 2 - ISENSE | Sense current output | Provides scaled replica of drain current (ID/Isense = 500); used for analog current feedback without disturbing main source path. |
| 3 - D | Drain | Main high-side power switch node; internally bonded to mounting base (mb) - requires electrical isolation from heatsink unless drain-referenced. |
| 4 - KS | Kelvin source | Dedicated low-noise source reference for gate drive return and current sense amplifier; separates high-current return from sensing path. |
| 5 - S | Source | Main power source terminal; carries full load current; referenced to system ground in low-side configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated current sensing | Eliminates need for external shunt resistor and differential amplifier in motor current loops, reducing BOM count and PCB area in EPAS ECUs. |
| TrenchPLUS technology | Delivers 6 mΩ RDS(on) at 10 V drive while maintaining <15.2 mΩ up to 175 °C - ensures consistent torque delivery across engine bay temperature range. |
| AEC-Q101 qualification | Validated for automotive safety-critical applications including EPAS and variable valve timing, with full stress testing per JEDEC JESD22 and JESD47. |
| ESD protection diodes | 6 kV HBM rating enables direct integration into exposed harness interfaces without additional TVS components in steering column modules. |
| Kelvin source (KS) terminal | Enables accurate gate-source voltage regulation and stable current sensing by isolating high-di/dt source return from sensitive analog paths. |
Applications
| Electrical Power Assisted Steering (EPAS) | Variable Valve Timing (VVT) |
|---|---|
|
Use Scenario: High-current bidirectional motor phase switching in 12 V/24 V automotive steering assist systems. IC Role / Device Role / Timing Role: Main power switch in H-bridge or 3-phase inverter stage; handles peak currents up to 468 A pulsed. Use Value: Integrated current sensing enables real-time torque feedback without signal degradation from PCB trace inductance or layout asymmetry. |
Use Scenario: Solenoid actuation control for cam phasing in gasoline and diesel engines. IC Role / Device Role / Timing Role: Low-side switch driving inductive VVT solenoids with fast turn-off (tf = 122 ns) and avalanche ruggedness. Use Value: 0.63 J unclamped avalanche energy absorbs flyback energy from 100+ mH solenoids without snubber circuits. |
| Engine Start-Stop Systems | Electric Turbocharger Actuation |
|
Use Scenario: High-reliability starter motor engagement/disengagement in micro-hybrid architectures. IC Role / Device Role / Timing Role: High-current contactor replacement; switches >100 A cranking loads with minimal voltage drop. Use Value: 6 mΩ RDS(on) limits conduction loss to <6 W at 100 A, reducing thermal stress during repeated start cycles. |
Use Scenario: Precision wastegate or variable geometry vane control in 48 V mild-hybrid turbochargers. IC Role / Device Role / Timing Role: PWM-driven actuator driver with current feedback for closed-loop position control. Use Value: ID/Isense ratio stability (±10%) over -55 °C to +175 °C ensures consistent current scaling across exhaust manifold temperature gradients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel automotive power MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N4F7AG | 40 V, 220 A, RDS(on) = 2.2 mΩ @ 10 V/100 A/25 °C; no integrated current sense; TO-220FP package. | Lacks ISENSE/KS terminals - requires external shunt and amplifier for current feedback; higher peak current capability but larger footprint. | Select when maximum current handling (>150 A continuous) outweighs need for on-chip sensing; verify gate drive strength for 100 nC QG. |
| ON Semiconductor NTMFS5C675NL | 40 V, 115 A, RDS(on) = 5.1 mΩ @ 10 V/50 A/25 °C; no current sense; SO-8FL package (surface-mount). | Surface-mount only; no Kelvin source or sense pin; limited thermal dissipation (Ptot = 83 W) vs. 221 W for BUK7908-40AIE. | Prefer for space-constrained, lower-power auxiliary actuators where TO-220 mechanical robustness and heatsink interface are not required. |
Compared with STL220N4F7AG and NTMFS5C675NL, BUK7908-40AIE uniquely combines automotive qualification, integrated current sensing, Kelvin-source topology, and TO-220 thermal performance-making it the only option among the three suitable for production EPAS motor phase control without signal-path compromises.
Availability
BUK7908-40AIE is available at Aetrix Electronics and suitable for Electrical Power Assisted Steering (EPAS), Variable Valve Timing (VVT), and engine start-stop systems requiring stable component supply, long-term automotive lifecycle support, and traceable sourcing.
Supply support for BUK7908-40AIE 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, logic, and MOSFET solutions, with leadership in automotive and industrial power management.
BUK7908-40AIE belongs to Nexperia's TrenchPLUS automotive MOSFET product line, engineered specifically for high-current, safety-critical vehicle subsystems demanding AEC-Q101 compliance, current sensing, and thermal resilience.
FAQ
What is the function of the KS (Kelvin source) pin?
The KS pin provides a dedicated low-impedance, low-noise return path for gate drive and current sense circuitry. It is physically separated from the main source (S) terminal to eliminate voltage drop errors caused by high di/dt through bond wires and PCB traces, ensuring accurate VGS control and stable ISENSE signal integrity in motor control loops.
Can BUK7908-40AIE be used in high-side switching configurations?
No - the mounting base (mb) is internally connected to the drain (pin 3), making high-side use electrically incompatible unless the heatsink is fully isolated and rated for full drain potential. It is optimized for low-side or half-bridge configurations where source (S) is grounded or referenced to a stable potential.
How does the ID/Isense ratio vary with temperature?
The ID/Isense ratio remains within 450–550 across the full operating junction temperature range (-55 °C to +175 °C) when VGS > 10 V. This tight tolerance ensures consistent current feedback scaling without software compensation in EPAS or VVT control algorithms.
Is external gate resistor required for reliable operation?
Yes - a gate resistor (typically 10 Ω, as specified in the datasheet's switching time test conditions) is required to damp ringing, limit peak gate current, and control dV/dt during switching. Omitting it risks oscillation, shoot-through in bridge topologies, and accelerated gate oxide wear under high-frequency PWM.
BUK7908-40AIE,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:
- 8mOhm @ 50A, 10V
- Vgs(th) (Max) @ Id:
- 4V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 84 nC @ 10 V
- Vgs (Max):
- ±20V
- Input Capacitance (Ciss) (Max) @ Vds:
- 3140 pF @ 25 V
- FET Feature:
- Current Sensing
- Power Dissipation (Max):
- 221W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-5
BUK7908-40AIE,127 FAQ
1.How can I place an order for BUK7908-40AIE,127 through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK7908-40AIE,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 BUK7908-40AIE,127 reliable?
The price and inventory of BUK7908-40AIE,127 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK7908-40AIE,127 is usually 5 days.
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BUK7908-40AIE,127 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK7908-40AIE,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 BUK7908-40AIE,127?
For technical support, including BUK7908-40AIE,127 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK7908-40AIE,127 requirements.
6.How does Aetrix verify that BUK7908-40AIE,127 is sourced from the original manufacturer or authorized distributors?
All BUK7908-40AIE,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 BUK7908-40AIE,127 meets industry standards.
7.What is the process for return or replacement of BUK7908-40AIE,127?
All BUK7908-40AIE,127 units undergo pre-shipment inspection (PSI). If there is an issue with BUK7908-40AIE,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 BUK7908-40AIE,127 part is unused and in its original packaging.
Return procedure for BUK7908-40AIE,127:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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