Bipolar transistors

Diodes

ESD protection, TVS, filtering and signal conditioning

MOSFETs

SiC MOSFETs

GaN FETs

IGBTs

Analog & Logic ICs

Automotive qualified products (AEC-Q100/Q101)

BUK9Y4R4-40E

N-channel 40 V, 4.4 mΩ logic level MOSFET in LFPAK56

Logic level N-channel MOSFET in an LFPAK56 (Power SO8) package using TrenchMOS technology. This product has been designed and qualified to AEC Q101 standard for use in high performance automotive applications.

Features and benefits

  • Q101 compliant

  • Repetitive avalanche rated

  • Suitable for thermally demanding environments due to 175 °C rating

  • True logic level gate with VGS(th) rating of greater than 0.5 V at 175 °C

Applications

  • 12 V Automotive systems

  • Motors, lamps and solenoid control

  • Transmission control

  • Ultra high performance power switching

Parametrics

Type number Package version Package name Product status Channel type Nr of transistors VDS [max] (V) RDSon [max] @ VGS = 10 V (mΩ) RDSon [max] @ VGS = 5 V (mΩ) Tj [max] (°C) ID [max] (A) QGD [typ] (nC) Ptot [max] (W) Qr [typ] (nC) VGSth [typ] (V) Automotive qualified Ciss [typ] (pF) Coss [typ] (pF) Release date
BUK9Y4R4-40E SOT669 LFPAK56; Power-SO8 Production N 1 40 3.7 4.4 175 100 8.7 147 16.5 1.7 Y 3058 422 2013-02-20

Package

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
BUK9Y4R4-40E BUK9Y4R4-40E,115
(934067045115)		 Active 94E440 SOT669
LFPAK56; Power-SO8
(SOT669) 		SOT669 REFLOW_BG-BD-1
WAVE_BG-BD-1
SOT669_115

Environmental information

Type number Orderable part number Chemical content RoHS RHF-indicator
BUK9Y4R4-40E BUK9Y4R4-40E,115 BUK9Y4R4-40E rohs rhf
Quality and reliability disclaimer

Series

Documentation (24)

File name Title Type Date
BUK9Y4R4-40E N-channel TrenchMOS logic level FET Data sheet 2017-04-20
AN10273 Power MOSFET single-shot and repetitive avalanche ruggedness rating Application note 2022-06-20
AN10874_ZH LFPAK MOSFET thermal design guide, Chinese version Application note 2020-04-30
AN11113_ZH LFPAK MOSFET thermal design guide - Part 2 Application note 2020-04-30
AN11156 Using Power MOSFET Zth Curves Application note 2021-01-04
AN11158 Understanding power MOSFET data sheet parameters Application note 2025-02-18
AN11158_ZH Understanding power MOSFET data sheet parameters Application note 2021-01-04
AN11160 Designing RC Snubbers Application note 2024-10-21
AN11243 Failure signature of Electrical Overstress on Power MOSFETs Application note 2025-03-20
AN11261 RC Thermal Models Application note 2021-03-18
AN11599 Using power MOSFETs in parallel Application note 2016-07-13
AN90063 Questions about package outline drawings Application note 2025-06-13
SOT669 3D model for products with SOT669 package Design support 2017-06-30
Nexperia_package_poster Nexperia package poster Leaflet 2020-05-15
LFPAK56_POWER-SO8_SOT669_mk plastic, single-ended surface-mounted package; 4 terminals; 4.9 mm x 4.45 mm x 1 mm body Marcom graphics 2017-01-28
BUK9xxxx-40E_LTspice_V3 BUK9xxxx-40E Precision ElectroThermal (PET) LTspice model PET SPICE model 2022-12-14
SOT669 plastic, single-ended surface-mounted package; 4 terminals Package information 2025-03-20
SOT669_115 LFPAK56; Reel pack for SMD, 7"; Q1/T1 product orientation Packing information 2022-05-10
REFLOW_BG-BD-1 Reflow soldering profile Reflow soldering 2021-04-06
BUK9Y4R4-40E BUK9Y4R4-40E Spice model SPICE model 2013-02-22
TN00008 Power MOSFET frequently asked questions and answers Technical note 2024-08-09
BUK9Y4R4-40E_RC_Thermal_Model BUK9Y4R4-40E Thermal design model Thermal design 2021-01-18
BUK9Y4R4-40E BUK9Y4R4-40E Thermal model Thermal model 2013-02-26
WAVE_BG-BD-1 Wave soldering profile Wave soldering 2021-09-08

Support

If you are in need of design/technical support, let us know and fill in the answer form we'll get back to you shortly.


Longevity

The Nexperia Longevity Program is aimed to provide our customers information from time to time about the expected time that our products can be ordered. The NLP is reviewed and updated regularly by our Executive Management Team. View our longevity program here.


Models

File name Title Type Date
BUK9xxxx-40E_LTspice_V3 BUK9xxxx-40E Precision ElectroThermal (PET) LTspice model PET SPICE model 2022-12-14
BUK9Y4R4-40E BUK9Y4R4-40E Spice model SPICE model 2013-02-22
BUK9Y4R4-40E_RC_Thermal_Model BUK9Y4R4-40E Thermal design model Thermal design 2021-01-18
BUK9Y4R4-40E BUK9Y4R4-40E Thermal model Thermal model 2013-02-26
SOT669 3D model for products with SOT669 package Design support 2017-06-30

Ordering, pricing & availability

Type number Orderable part number Ordering code (12NC) Status Packing Packing Quantity Buy online
BUK9Y4R4-40E BUK9Y4R4-40E,115 934067045115 Active SOT669_115 1,500

Sample

As a Nexperia customer you can order samples via our sales organization.

If you do not have a direct account with Nexperia our network of global and regional distributors is available and equipped to support you with Nexperia samples. Check out the list of official distributors.

How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.

Interactive datasheet

Orderable parts

Type number Orderable part number Ordering code (12NC) Package Buy from distributors
BUK9Y4R4-40E BUK9Y4R4-40E,115 934067045115 SOT669 Order product