Product parameter：
| VB Package |
Configuration |
VDS(V) |
VGS |
Vthyp（V） |
ID(A) |
Rds2.5 |
Rds4.5 |
Rds10 |
Technology |
| DFN8(3X3) |
Single-N |
40V |
|
1.8V |
28A |
|
15(mΩ) |
13(mΩ) |
Trench |
| VB Package |
Configuration |
VCE |
VGE |
VGEth(V) |
VCEsat15V |
ICE |
Technology |
| DFN8(3X3) |
Single-N |
|
|
|
|
|
Trench |
| VB Package |
Configuration |
VDS(V) |
VGS |
Vthyp（V） |
ID(A) |
Rds18 |
Technology |
| DFN8(3X3) |
Single-N |
40V |
|
1.8V |
28A |
|
Trench |
| VB Package |
Configuration |
VDS(V) |
VGS |
Vthyp（V） |
ID(A) |
Rds6 |
Technology |
| DFN8(3X3) |
Single-N |
40V |
|
1.8V |
28A |
|
Trench |
| VB Package |
Polarity |
Vz / VR |
Pd |
VF |
IF |
IR |
Cd |
Type |
| DFN8(3X3) |
Single-N |
|
|
|
|
|
|
|
Withstand voltage 40V, suitable for low-voltage high-current applications with ample safety margin
Gate drive range ±20V, compatible with 4.5V~10V logic level drive
Threshold voltage 1.8V, low-voltage control signals can directly turn on
On-resistance 15mΩ (at 4.5V drive), 13mΩ (at 10V drive), extremely low loss
Maximum current 28A, high power in a small package
Trench technology, excellent switching performance and stable conduction characteristics
Domain and module applications：
High-power DC-DC converters – Used as synchronous rectifiers or main switches, significantly reducing conduction losses and improving overall conversion efficiency.
Motor drive modules / Power tools – Handles 28A peak current, combined with low on-resistance for strong output and precise speed control.
Lithium battery protection boards – Fast shutdown during overcurrent or short circuit, effectively protecting cell charge/discharge safety.
Smart power sockets / Server power supplies – Utilizes low on-resistance and compact package for high-density power switching and thermal management.
Automotive electronics / E-bike controllers – Tolerates vehicle voltage fluctuations, providing a stable and reliable power path for motors or loads.
Solar inverters (low-voltage side) – Meets high-current bus switching needs, reduces power device temperature rise, and extends system life. One-sentence summary: The BUK9Q20-40HJ-VB is not just a power MOSFET with excellent parameters; it is a trustworthy "efficiency core" and "heat dissipation pioneer" for your high-current, space-constrained designs.
* Please note: the above is only an example application scenario, the specific application depends on the requirements and conditions of the system design. When using this device, consult its data sheet for detailed technical specifications and features
Technical support：
* If you have any questions about the product, please fill out the form to submit, we will reply you within 24 hours
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