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Nexperia USA Inc. BUK9K20-80EX
- Part No.:
- BUK9K20-80EX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- FET, MOSFET Arrays
- Package:
- SOT-1205, 8-LFPAK56
- Datasheet:
-
BUK9K20-80EX.pdf
- Description:
- MOSFET 2N-CH 80V 23A LFPAK56D
- Quantity:
- Payment:
- Shipping:
Inventory:50
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Product details
Overview
BUK9K20-80EX from Nexperia is a dual N-channel logic-level MOSFET in LFPAK56D (SOT1205) package, rated for 80 V VDS, 20 mΩ RDS(on) at VGS = 5 V and Tj = 25 °C, qualified to AEC-Q101 for automotive use, and rated for continuous operation up to 175 °C junction temperature. It serves as a high-reliability power switch in 12 V/24 V/48 V automotive subsystems requiring thermally robust, repetitive-avalanche-capable dual-channel control.
For engineers reviewing the BUK9K20-80EX datasheet, BUK9K20-80EX pinout, BUK9K20-80EX application, or BUK9K20-80EX equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, thermal derating behavior, and AEC-Q101-compliant selection guidance - all grounded in Nexperia's official 2018 product data sheet.
Technical Context
This dual MOSFET integrates two independent N-channel TrenchMOS devices in a single LFPAK56D package with shared mounting base, enabling compact dual-switch topologies without cross-conduction risk. Its true logic-level gate supports direct drive from 3.3 V or 5 V microcontrollers, with VGS(th) ≥ 0.5 V even at 175 °C - ensuring reliable turn-on under worst-case thermal stress.
The device features symmetric FET1/FET2 characteristics: identical 80 V VDS, 23 A ID (Tmb = 25 °C), 68 W Ptot, and matched dynamic parameters including QGD = 9.4 nC and Ciss = 2.6–3.5 nF. Repetitive avalanche rating (EAS = 132 mJ) and 2.21 K/W Rth(j-mb) support high-energy switching in transmission and motor control circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 80 V - Maximum drain-source blocking voltage; enables use in 48 V automotive systems with margin against load-dump transients. |
| RDS(on) | 14.2 mΩ typ @ VGS = 5 V, ID = 10 A, Tj = 25 °C - Low conduction loss supports high-efficiency switching in solenoid and lamp drivers. |
| ID | 23 A continuous @ Tmb = 25 °C - Sustains high-current loads such as starter relays or HVAC blowers without external heatsinking. |
| Tj max | 175 °C - Enables operation in engine bay or transmission control modules where ambient temperatures exceed 125 °C. |
| QGD | 9.4 nC - Low gate-drain charge reduces Miller-induced switching losses and improves EMI performance in PWM-driven motors. |
| Rth(j-mb) | 2.21 K/W - Enables efficient heat transfer to PCB copper pour or heatsink, supporting >50 W dissipation with minimal ΔT. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and UHAST per AEC standard. |
Pinout & Package
Package: LFPAK56D (SOT1205), plastic surface-mount package with exposed mounting base for enhanced thermal performance; 8-pin layout with dual drain-source-gate symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | S1 | Source terminal of FET1 - connects to low-side return path; electrically isolated from S2 but shares common thermal base. |
| 2 | G1 | Gate terminal of FET1 - accepts logic-level drive; threshold stable across full automotive temperature range. |
| 3 | S2 | Source terminal of FET2 - independent return path for second switched load; enables dual independent channel control. |
| 4 | G2 | Gate terminal of FET2 - fully decoupled from G1; allows asynchronous or complementary switching configurations. |
| 5 & 6 | D2 | Drain terminals of FET2 - paralleled pins for low-inductance, high-current connection to power rail or load. |
| 7 & 8 | D1 | Drain terminals of FET1 - paralleled pins providing robust 23 A current path with minimized bond-wire inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent N-channel MOSFETs | Enables space-efficient dual-load switching (e.g., H-bridge half-bridge + brake, or dual solenoids) without discrete pairing. |
| True logic-level gate (VGS(th) ≥ 0.5 V @ 175 °C) | Guarantees turn-on with standard 3.3 V/5 V MCU GPIOs even under extreme under-hood thermal conditions. |
| Repetitive avalanche rated (EAS = 132 mJ) | Withstands inductive kickback from motors/solenoids without external snubbers, improving system robustness and BOM simplicity. |
| 175 °C junction-rated operation | Supports placement in high-temperature zones (e.g., near engines or transmissions) without derating or forced cooling. |
| LFPAK56D thermal performance (Rth(j-mb) = 2.21 K/W) | Delivers 2.5× better thermal resistance than SO-8, enabling higher power density in compact automotive ECUs. |
Applications
| Transmission Control Module | Engine Cooling Fan Driver |
|---|---|
|
Use Scenario: Controlling hydraulic solenoid valves and clutch actuators in automatic transmission control units. IC Role / Device Role / Timing Role: Dual-channel high-side/low-side switch managing bidirectional fluid pressure modulation with precise PWM timing. Use Value: 80 V rating handles battery transients during gear shifts; 175 °C rating ensures uninterrupted operation inside sealed transmission housings. |
Use Scenario: Driving high-current DC brushless fans in engine bay cooling systems with variable-speed control. IC Role / Device Role / Timing Role: Dual N-channel configuration used in half-bridge topology for PWM-controlled fan speed regulation. Use Value: 23 A continuous current supports >300 W fan loads; low RDS(on) minimizes conduction loss at 12 V nominal supply. |
| Start-Stop System Relay Replacement | LED Headlamp Matrix Switching |
|
Use Scenario: Replacing electromechanical relays in vehicle start-stop battery management for cranking circuit engagement. IC Role / Device Role / Timing Role: High-reliability solid-state switch handling repeated 200–300 A inrush currents during engine restart cycles. Use Value: Repetitive avalanche capability absorbs energy from coil back-EMF; AEC-Q101 qualification ensures >10-year field life. |
Use Scenario: Pixel-level on/off control of high-brightness LED arrays in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Dual-channel fast-switching element enabling microsecond-level LED segment activation for dynamic beam shaping. Use Value: 9.4 nC QGD and 22.7 ns fall time support >10 kHz PWM dimming without thermal runaway or EMI issues. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual N-channel automotive MOSFET applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon BSC014N06LS | 60 V VDS, 1.4 mΩ RDS(on) @ 10 V, TO-263 package, no AEC-Q101 certification | Limited to 24 V systems; lacks repetitive avalanche rating and 175 °C qualification | Select only for non-automotive industrial 24 V motor drives where cost outweighs qualification requirements. |
| ON Semiconductor NTMFS5C675NL | 60 V VDS, 2.2 mΩ RDS(on) @ 10 V, PowerSO-8, AEC-Q101 qualified but single-channel | Requires two devices for dual functionality; higher board area and gate drive complexity | Choose when footprint constraints allow dual discrete placement and 60 V rating suffices for target system. |
Compared with BUK9K20-80EX, the Infineon part offers lower RDS(on) but sacrifices voltage headroom and automotive qualification; the ON Semiconductor part matches AEC-Q101 compliance but doubles component count and thermal interface complexity - making BUK9K20-80EX the optimal single-package solution for 48 V–rated, thermally demanding dual-switch automotive nodes.
Availability
BUK9K20-80EX is available at Aetrix Electronics and suitable for automotive transmission control, engine cooling fan management, and start-stop relay replacement requiring stable component supply, long-term lifecycle assurance, and AEC-Q101-compliant traceability.
Supply support for BUK9K20-80EX 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 essential semiconductors - delivering discrete, logic, and MOSFET solutions optimized for automotive, industrial, and computing applications.
BUK9K20-80EX belongs to Nexperia's Automotive Logic Level MOSFET product line, engineered specifically for thermally aggressive automotive subsystems requiring AEC-Q101 qualification, repetitive avalanche ruggedness, and simplified logic-level drive architecture.
FAQ
Is BUK9K20-80EX pin-compatible with other LFPAK56D dual MOSFETs?
No - BUK9K20-80EX uses a unique 8-pin LFPAK56D (SOT1205) pinout with dual drain paralleling (pins 5&6 = D2, pins 7&8 = D1). Other dual LFPAK56D devices like BUK7K13-40E use different pin assignments and internal connectivity; direct substitution requires schematic and layout revision.
What is the maximum continuous drain current at 100 °C mounting base temperature?
Per Figure 2 in the datasheet, the continuous drain current for each FET drops to 16 A at Tmb = 100 °C with VGS ≥ 5 V. This reflects thermal derating due to reduced heat transfer efficiency at elevated board temperatures, not device failure.
Does BUK9K20-80EX support gate drive from 3.3 V microcontrollers?
Yes - its guaranteed VGS(th) ≥ 0.5 V at 175 °C and typical RDS(on) of 14.2 mΩ at VGS = 5 V ensure robust enhancement mode operation with 3.3 V logic, though RDS(on) increases to ~35 mΩ at that voltage per Figure 7.
Can BUK9K20-80EX be used in synchronous rectification applications?
No - it is not characterized or qualified for synchronous rectification. Its body diode has trr = 29.9 ns and Qr = 36.5 nC, but no reverse recovery safe operating area (RRA SOA) or diode forward voltage specs are provided for high-frequency freewheeling use.
BUK9K20-80EX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SOT-1205, 8-LFPAK56
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Technology:
- MOSFET (Metal Oxide)
- Configuration:
- 2 N-Channel (Dual)
- FET Feature:
- Logic Level Gate
- Drain to Source Voltage (Vdss):
- 80V
- Current - Continuous Drain (Id) @ 25°C:
- 23A (Ta)
- Rds On (Max) @ Id, Vgs:
- 17mOhm @ 10A, 10V
- Vgs(th) (Max) @ Id:
- 2.1V @ 1mA
- Gate Charge (Qg) (Max) @ Vgs:
- 25.5nC @ 5V
- Input Capacitance (Ciss) (Max) @ Vds:
- 3462pF @ 25V
- Power - Max:
- 68W
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- LFPAK56D
BUK9K20-80EX FAQ
1.How can I place an order for BUK9K20-80EX through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9K20-80EX 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 BUK9K20-80EX reliable?
The price and inventory of BUK9K20-80EX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9K20-80EX is usually 5 days.
3.What payment methods are accepted for BUK9K20-80EX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9K20-80EX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9K20-80EX?
BUK9K20-80EX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9K20-80EX 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 BUK9K20-80EX?
For technical support, including BUK9K20-80EX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9K20-80EX requirements.
6.How does Aetrix verify that BUK9K20-80EX is sourced from the original manufacturer or authorized distributors?
All BUK9K20-80EX 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 BUK9K20-80EX meets industry standards.
7.What is the process for return or replacement of BUK9K20-80EX?
All BUK9K20-80EX units undergo pre-shipment inspection (PSI). If there is an issue with BUK9K20-80EX, 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 BUK9K20-80EX part is unused and in its original packaging.
Return procedure for BUK9K20-80EX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BUK9K20-80EX Tags
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2N7002BKS,115
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