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Nexperia USA Inc. BUK9277-55A/CDJ
- Part No.:
- BUK9277-55A/CDJ
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Bipolar Transistors
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
BUK9277-55A/CDJ.pdf
- Description:
- TRANS DPAK
- Quantity:
- Payment:
- Shipping:
Inventory:8,545
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Product details
Overview
BUK9277-55A/CDJ from Nexperia is a logic-level N-channel TrenchMOS FET in DPAK (SOT428) package, rated for 55 V VDS, 18 A continuous drain current at Tmb = 25 °C, and 175 °C junction temperature. It delivers RDS(on) of 65 mΩ at VGS = 5 V and Tj = 25 °C, and is AEC-Q101 qualified for automotive power switching in 12 V/24 V systems.
For engineers reviewing the BUK9277-55A/CDJ datasheet, BUK9277-55A/CDJ pinout, BUK9277-55A/CDJ application, or BUK9277-55A/CDJ equivalent, this device supports thermally demanding automotive load control with verified avalanche ruggedness (33 mJ), low gate charge (11 nC), and robust thermal resistance (Rth(j-mb) = 2.93 K/W).
Technical Context
This MOSFET uses TrenchMOS technology to achieve low RDS(on) at logic-level gate drive (VGS = 4.5–5 V), enabling direct interface with microcontrollers and automotive logic ICs without level-shifting. Its gate threshold voltage (VGS(th)) ranges from 0.5 V to 2.3 V across -55 °C to 175 °C, ensuring reliable turn-on under wide thermal conditions.
The device features an integrated source-drain diode with 0.85 V forward voltage at 15 A and 33 ns reverse recovery time, supporting inductive load commutation. Its safe operating area (SOA) is defined up to 73 A peak drain current (10 µs pulse) and 55 V, with avalanche energy rating validated per unclamped inductive switching test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDS | 55 V - Maximum drain-source blocking voltage compatible with 48 V automotive systems and 24 V battery transients. |
| ID (continuous) | 18 A at Tmb = 25 °C - Sustains high-current loads like solenoids and motors without external heatsinking at ambient mounting base temps. |
| RDS(on) | 65 mΩ at VGS = 5 V, Tj = 25 °C - Enables <1.2 W conduction loss at 10 A, reducing thermal stress in compact PCB layouts. |
| EAS | 33 mJ (non-repetitive) - Withstands unclamped inductive energy from motor or relay coil de-energization without failure. |
| QG(tot) | 11 nC - Low gate charge allows fast switching with minimal driver power, suitable for PWM frequencies up to 100 kHz. |
| Rth(j-mb) | 2.93 K/W - Efficient heat transfer from die to mounting base enables high-power operation on copper-clad PCBs or heatsinks. |
| Tj(max) | 175 °C - Extended junction temperature rating supports operation in engine bay and powertrain modules. |
Pinout & Package
Package: DPAK (SOT428), plastic single-ended surface-mounted package with 3 leads (one lead cropped); mounting base (mb) electrically connected to drain.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (G) | Gate | Control terminal accepting logic-level input (4.5–5 V) to fully enhance channel; requires <11 nC charge for full turn-on. |
| 2 (D) | Drain | Main high-side or low-side power path; internally bonded to mounting base for direct thermal and electrical connection to PCB copper pour. |
| 3 (S) | Source | Return path for load current; referenced to system ground in low-side switch configuration; hosts internal body diode cathode. |
| mb (Mounting Base) | Drain Connection / Thermal Interface | Exposed metal pad tied to drain; serves as primary thermal conduction path to PCB heatsink area and must be soldered to ≥2 cm² copper. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive safety-critical applications including engine control, lighting, and transmission modules. |
| Logic-level gate drive | Guaranteed turn-on with VGS ≥ 4.5 V, eliminating need for gate driver ICs in MCU-based 3.3 V/5 V control systems. |
| 175 °C junction rating | Enables placement in high-temperature zones (e.g., near engines or inverters) without derating or forced cooling. |
| Low RDS(on) at 5 V | 65 mΩ typical at VGS = 5 V ensures <0.65 W conduction loss at 10 A, minimizing board-level thermal management complexity. |
| Unclamped avalanche rated | 33 mJ EAS supports robust operation in inductive switching circuits without external snubbers or clamps. |
Applications
| Automotive Body Control Module (BCM) | 12 V/24 V DC Motor Driver |
|---|---|
|
Use Scenario: Switching headlamp, fog lamp, or HVAC blower loads in vehicle body electronics. IC Role / Device Role / Timing Role: Low-side power switch controlled by 5 V microcontroller GPIO, handling up to 18 A resistive or inductive loads. Use Value: Eliminates need for external level shifters or drivers; AEC-Q101 qualification ensures reliability over 15-year vehicle lifetime. |
Use Scenario: Driving brushed DC motors in power seats, window lifts, or sunroof actuators. IC Role / Device Role / Timing Role: High-current, bidirectional-capable (with H-bridge pairing) switching element with fast 33 ns trr for efficient PWM commutation. Use Value: 33 mJ avalanche energy absorbs back-EMF during motor stall or abrupt stop, preventing device failure without added protection components. |
| Engine Bay Solenoid Control | Industrial 24 V PLC Output Stage |
|
Use Scenario: Controlling fuel injector solenoids or turbocharger wastegate actuators in high-temperature engine compartments. IC Role / Device Role / Timing Role: High-temperature-rated power switch operating continuously at Tj up to 175 °C with minimal derating. Use Value: 2.93 K/W Rth(j-mb) enables direct thermal coupling to aluminum chassis, reducing need for discrete heatsinks. |
Use Scenario: Solid-state replacement for electromechanical relays in programmable logic controller output modules. IC Role / Device Role / Timing Role: Logic-compatible, high-cycle-life switching element delivering 18 A continuous current with <100 ns total switching time. Use Value: 11 nC QG and 47 ns tr support >50 kHz PWM control for precise current regulation in industrial motion control. |
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 |
|---|---|---|---|
| STL220N6F7 | 60 V VDS, 220 A pulsed ID, RDS(on) = 2.2 mΩ @ 10 V - requires 10 V gate drive for optimal performance. | Higher current capacity but not logic-level; needs gate driver for 3.3 V/5 V MCU interfaces. | Select when higher peak current (>73 A) and lower RDS(on) are critical, and gate drive voltage can be boosted to 10 V. |
| IRLZ44NPBF | 55 V VDS, 49 A ID, RDS(on) = 22 mΩ @ 5 V - larger TO-220 package, no AEC-Q101 qualification. | Higher power dissipation capability but lacks automotive qualification and DPAK thermal efficiency. | Choose for non-automotive industrial use where PCB space allows TO-220 and qualification is not required. |
Compared with STL220N6F7 and IRLZ44NPBF, BUK9277-55A/CDJ uniquely balances logic-level compatibility, AEC-Q101 compliance, and DPAK thermal performance-making it optimal for space-constrained, high-reliability automotive power stages where gate drive voltage is limited to 5 V.
Availability
BUK9277-55A/CDJ is available at Aetrix Electronics and suitable for automotive body control modules, 12 V/24 V motor drives, and engine bay solenoid control requiring stable component supply across extended product lifecycles.
Supply support for BUK9277-55A/CDJ 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, with leadership in logic, discretes, and MOSFETs for automotive and industrial markets.
BUK9277-55A/CDJ belongs to Nexperia's TrenchMOS automotive-qualified power MOSFET family, engineered specifically for robust, logic-level-controlled switching in harsh-temperature automotive environments.
FAQ
Is BUK9277-55A/CDJ pin-compatible with standard DPAK MOSFETs?
Yes - BUK9277-55A/CDJ uses the industry-standard DPAK (SOT428) outline with 3 leads (G-D-S) and exposed mounting base. Pin 1 is Gate, Pin 2 is Drain (connected to mb), Pin 3 is Source. Mechanical dimensions match JEDEC SC-63 and TO-252 footprints, enabling drop-in replacement where thermal and electrical specs align.
What is the maximum recommended PCB copper area for the mounting base?
Nexperia recommends ≥2 cm² of 2-oz copper connected directly to the mounting base for optimal thermal performance. This achieves the specified Rth(j-mb) = 2.93 K/W; reducing copper area increases thermal resistance proportionally - e.g., 1 cm² raises Rth(j-mb) to ~3.8 K/W per characterization data in Figure 1.
Does BUK9277-55A/CDJ require a gate resistor for automotive EMI compliance?
A gate resistor of 10 Ω is used in Nexperia's reference SOA and switching characterization (Fig. 3, Fig. 14). This value balances EMI suppression and switching speed - reducing below 5 Ω increases dV/dt and radiated emissions; increasing above 22 Ω extends turn-off time beyond 50 ns, raising switching losses in PWM applications.
Can BUK9277-55A/CDJ replace BUK9277-55B in existing designs?
No - BUK9277-55B is a different variant with distinct RDS(on) distribution (typ. 55 mΩ vs. 65 mΩ) and tighter VGS(th) limits. While both share DPAK packaging and AEC-Q101 status, BUK9277-55A/CDJ has higher RDS(on) tolerance and is optimized for cost-sensitive automotive applications where 10% RDS(on) increase is acceptable for broader process yield.
BUK9277-55A/CDJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Power - Max:
- -
- Frequency - Transition:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DPAK
BUK9277-55A/CDJ FAQ
1.How can I place an order for BUK9277-55A/CDJ through Aetrix?
Please submit a Request for Quotation (RFQ) for BUK9277-55A/CDJ 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 BUK9277-55A/CDJ reliable?
The price and inventory of BUK9277-55A/CDJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BUK9277-55A/CDJ is usually 5 days.
3.What payment methods are accepted for BUK9277-55A/CDJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BUK9277-55A/CDJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BUK9277-55A/CDJ?
BUK9277-55A/CDJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BUK9277-55A/CDJ 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 BUK9277-55A/CDJ?
For technical support, including BUK9277-55A/CDJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BUK9277-55A/CDJ requirements.
6.How does Aetrix verify that BUK9277-55A/CDJ is sourced from the original manufacturer or authorized distributors?
All BUK9277-55A/CDJ 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 BUK9277-55A/CDJ meets industry standards.
7.What is the process for return or replacement of BUK9277-55A/CDJ?
All BUK9277-55A/CDJ units undergo pre-shipment inspection (PSI). If there is an issue with BUK9277-55A/CDJ, 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 BUK9277-55A/CDJ part is unused and in its original packaging.
Return procedure for BUK9277-55A/CDJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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