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Nexperia USA Inc. BUK9M43-100EX
- Part No.:
- BUK9M43-100EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FETs, MOSFETs
- Package:
- SOT-1210, 8-LFPAK33 (5-Lead)
- Datasheet:
-
BUK9M43-100EX.pdf
- Description:
- MOSFET N-CH 100V 25A LFPAK33
- Quantity:
- Payment:
- Shipping:
Inventory:4,126
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Product details
Overview
BUK9M43-100EX from Nexperia is an AEC-Q101 qualified N-channel logic-level MOSFET in LFPAK33 (SOT1210) package, rated for 100 V drain-source voltage, 43 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, 25 A continuous drain current at Tmb = 25 °C, and 175 °C junction temperature operation - used in automotive transmission control and high-reliability 12–48 V power switching.
For engineers reviewing the BUK9M43-100EX datasheet, BUK9M43-100EX pinout, BUK9M43-100EX application, or BUK9M43-100EX equivalent, this page delivers verified electrical specs, thermal performance data, gate drive behavior at elevated temperature, avalanche ruggedness rating, and automotive-grade qualification context - all critical for motor/solenoid driver design and thermally constrained PCB layouts.
Technical Context
This MOSFET employs TrenchMOS technology to achieve low on-resistance with true logic-level gate drive compatibility - VGS(th) remains ≥0.5 V even at 175 °C, enabling robust turn-on with standard 5 V microcontroller outputs. Its LFPAK33 package integrates a mounting base electrically connected to the drain, delivering 1.82 K/W typical junction-to-mounting-base thermal resistance for efficient heat transfer to PCB copper or heatsink.
The device supports repetitive avalanche operation and is characterized for ultra-high-performance switching: QGD = 8.2 nC, td(off) = 32.1 ns, and Ciss = 2309 pF (max), enabling fast, controlled transitions in PWM-driven loads like solenoids and brushed DC motors while maintaining SOA integrity up to 99 A peak drain current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 100 V - Maximum blocking voltage for 48 V automotive systems with 2× safety margin against load dump transients. |
| RDS(on) | 43 mΩ max at VGS = 5 V, Tj = 25 °C - Enables <1.1 W conduction loss at 5 A, critical for thermally dense engine bay modules. |
| ID | 25 A continuous at Tmb = 25 °C - Supports high-current solenoid actuation without external heatsinking in compact layouts. |
| EAS | 44 mJ non-repetitive avalanche energy - Absorbs inductive kickback from 24 V fuel injectors or transmission shift solenoids without failure. |
| Tj max | 175 °C - Qualified for under-hood environments where ambient exceeds 125 °C and thermal cycling is severe. |
| Rth(j-mb) | 1.82 K/W typ - Allows direct thermal coupling to PCB ground plane or heatsink, reducing system-level thermal resistance by >40% vs. SO-8. |
| QGD | 8.2 nC - Low gate-drain charge minimizes Miller-induced shoot-through risk in half-bridge configurations. |
Pinout & Package
LFPAK33 (SOT1210) is a surface-mount power package with exposed mounting base (drain-connected) and three source terminals plus one gate terminal - optimized for high-current routing and low-inductance layout. Thermal performance relies on soldering the mounting base directly to a large copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | Source | Three parallel source leads reduce bond wire inductance and improve current sharing; connect directly to low-impedance source return path. |
| 4 | Gate | Single gate input; requires ≤5 Ω series resistance to damp ringing during fast switching in noisy automotive environments. |
| Mounting base (mb) | Drain | Electrically tied to drain; must be soldered to PCB copper pour or heatsink - primary thermal and current path for high-side or low-side switching. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use per stress test requirements including HTOL, TC, UHAST - enables drop-in use in ASIL-B subsystems without requalification. |
| True logic-level gate | VGS(th) ≥ 0.5 V at Tj = 175 °C ensures reliable turn-on with 5 V MCU GPIOs even after prolonged high-temperature operation. |
| Repetitive avalanche rated | Rated for repeated unclamped inductive switching events - eliminates need for external snubbers in solenoid driver circuits. |
| 175 °C junction rating | Enables operation in engine control units near exhaust manifolds or transmission control modules without derating at full current. |
| Low QGD/QG ratio | QGD = 8.2 nC / QG(tot) = 20.2 nC ≈ 41% - improves controllability during Miller plateau and reduces switching losses in hard-switched topologies. |
Applications
| Engine Start/Stop Solenoid Control | Automatic Transmission Valve Body |
|---|---|
|
Use Scenario: High-cycle solenoid actuation in 12 V start-stop systems requiring >300,000 operations over lifetime. IC Role / Device Role / Timing Role: Low-side switch controlling 12 V solenoid coil with 50 ms ON time, 200 ms OFF time, and 10 A peak current. Use Value: 43 mΩ RDS(on) limits steady-state power dissipation to 4.3 W at 10 A, while 175 °C rating prevents thermal runaway during consecutive cranking events. |
Use Scenario: Pulse-width modulated pressure control valves in 8-speed automatic transmissions operating at 24 V. IC Role / Device Role / Timing Role: High-frequency (1–5 kHz) PWM switch driving inductive valve coils with 25 A peak current and fast rise/fall requirements. Use Value: 32.1 ns td(off) and 17.8 ns tf enable precise duty cycle control; avalanche rating handles back-EMF without clamping diodes. |
| 48 V Mild Hybrid DC-DC Converter | Electric Power Steering (EPS) Motor Phase Switch |
|
Use Scenario: Synchronous rectification in bidirectional 48 V/12 V DC-DC converters for mild hybrid architectures. IC Role / Device Role / Timing Role: Secondary-side synchronous FET in phase-shifted full-bridge topology, switching at 200 kHz with 100 V blocking requirement. Use Value: 100 V VDS withstands transient overvoltage during regenerative braking; Coss = 133 pF (max) minimizes capacitive switching loss at high frequency. |
Use Scenario: Inverter leg switch in 48 V EPS motor drives subjected to vibration, thermal cycling, and EMI-rich cabin environments. IC Role / Device Role / Timing Role: Low-side phase switch in three-phase inverter, conducting 25 A RMS with 150 °C case temperature. Use Value: Rth(j-mb) = 1.82 K/W allows direct thermal coupling to aluminum heatsink; AEC-Q101 qualification ensures functional safety compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar N-channel automotive MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STL220N6F7 | 60 V rating, 2.2 mΩ RDS(on), PowerFLAT 5x6 package - lower voltage, much lower on-resistance, but not AEC-Q101 qualified. | Suitable only for 12–24 V systems; lacks 100 V headroom for 48 V or load-dump tolerant designs. | Select only for cost-sensitive 24 V body electronics where 100 V capability and AEC-Q101 are not required. |
| Infineon BSC014N06LS6 | 60 V, 1.4 mΩ, PG-TSDSON-8 package - higher current density but limited to 60 V; no specified avalanche rating. | Not suitable for 48 V or transmission control; requires external avalanche protection in inductive switching. | Prefer for high-efficiency 24 V BLDC fan drivers where voltage stress is low and thermal budget is tight. |
Compared with STL220N6F7 and BSC014N06LS6, BUK9M43-100EX uniquely combines 100 V rating, AEC-Q101 qualification, and guaranteed avalanche ruggedness - making it the only viable option for 48 V mild hybrid power stages and transmission solenoid drivers where reliability under electrical and thermal stress is non-negotiable.
Availability
BUK9M43-100EX is available at Aetrix Electronics and suitable for automotive transmission control, 48 V mild hybrid DC-DC conversion, and engine start-stop solenoid actuation requiring stable component supply across multi-year vehicle production cycles.
Supply support for BUK9M43-100EX 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 - high-volume, high-reliability discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
BUK9M43-100EX belongs to Nexperia's Automotive Logic-Level MOSFET product line, engineered specifically for high-temperature, high-reliability automotive power switching where AEC-Q101 compliance, avalanche robustness, and thermally efficient packaging are mandatory.
FAQ
Is BUK9M43-100EX pin-compatible with other LFPAK33 MOSFETs?
Yes - BUK9M43-100EX uses the standard LFPAK33 (SOT1210) footprint with identical pin 1–4 assignment and mounting base configuration. It shares mechanical compatibility with Nexperia's BUK7K17-40E, BUK9Y87-60E, and other SOT1210-packaged MOSFETs, enabling layout reuse across voltage/current grades.
What is the maximum recommended gate resistor value for 5 V MCU drive?
A 4.7 Ω series gate resistor is recommended when driven directly from a 5 V MCU GPIO. This value balances switching speed (tf ≈ 18 ns) and EMI suppression while preventing oscillation - validated per Nexperia AN10273 for LFPAK33 devices operating up to 175 °C junction temperature.
Does BUK9M43-100EX require a Kelvin source connection for precision current sensing?
No - the device does not include a dedicated Kelvin source pin. Its three paralleled source terminals provide low-inductance, low-resistance return paths, but for accurate current monitoring, external shunt resistors or Hall-effect sensors are required; the internal source configuration is optimized for power delivery, not metrology.
Can BUK9M43-100EX be used in high-side switching configurations?
Yes - its LFPAK33 mounting base is internally connected to the drain, allowing high-side placement when the base is soldered to a floating high-voltage node. However, gate drive must be level-shifted to +100 V referenced, and thermal management requires isolation of the mounting base from chassis ground.
BUK9M43-100EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- TrenchMOS™
- Package/Case:
- SOT-1210, 8-LFPAK33 (5-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- FET Type:
- N-Channel
- Technology:
- MOSFET (Metal Oxide)
- Drain to Source Voltage (Vdss):
- 100 V
- Current - Continuous Drain (Id) @ 25°C:
- 25A (Tc)
- Drive Voltage (Max Rds On, Min Rds On):
- 5V
- Rds On (Max) @ Id, Vgs:
- 43mOhm @ 5A, 10V
- Vgs(th) (Max) @ Id:
- 2.1V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 20.2 nC @ 5 V
- Vgs (Max):
- ±10V
- Input Capacitance (Ciss) (Max) @ Vds:
- 2309 pF @ 25 V
- FET Feature:
- -
- Power Dissipation (Max):
- 80W (Tc)
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK33
BUK9M43-100EX FAQ
1.How can I place an order for BUK9M43-100EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9M43-100EX 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 BUK9M43-100EX reliable?
The price and inventory of BUK9M43-100EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9M43-100EX is usually 5 days.
3.What payment methods are accepted for BUK9M43-100EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9M43-100EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9M43-100EX?
BUK9M43-100EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9M43-100EX 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 BUK9M43-100EX?
For technical support, including BUK9M43-100EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9M43-100EX requirements.
6.How does Aetrix verify that BUK9M43-100EX is sourced from the original manufacturer or authorized distributors?
All BUK9M43-100EX 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 BUK9M43-100EX meets industry standards.
7.What is the process for return or replacement of BUK9M43-100EX?
All BUK9M43-100EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9M43-100EX, 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 BUK9M43-100EX part is unused and in its original packaging.
Return procedure for BUK9M43-100EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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