Philips Semiconductors BUK446-800A B Data Sheet
Summary
High-performance N-channel PowerMOS transistor (BUK446) designed for demanding power switching applications up to 800V. This comprehensive datasheet provides critical technical parameters, including static electrical characteristics, dynamic on-state resistance data, and thermal impedance curves. It offers essential design guidance—including safe operating areas—for engineers developing Switching Mode Power Supplies (SMPS), motor control units, DC/DC converters, or industrial welding systems.
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Philips Semiconductors Product Specification
Power MOS transistor BUK446-800A/B
GENERAL DESCRIPTION QUICK REFERENCE DATA N-channel enhancement mode SYMBOL PARAMETER MAX. MAX. UNIT field-effect power transistor in a plastic full-pack envelope. BUK446 -800A -800B
The device is intended for use in VDS Drain-source voltage
Switched Mode Power Supplies ID Drain current (DC) 2.0 1.7 (SMPS), motor control, welding, Ptot Total power dissipation DC/DC and AC/DC converters, and RDS(ON) Drain-source on-state in general purpose switching resistance applications.
PINNING - SOT186 PIN CONFIGURATION SYMBOL PIN DESCRIPTION
gate drain
source case isolated
LIMITING VALUES Limiting values in accordance with the Absolute Maximum System (IEC 134) SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT VDS Drain-source voltage VDGR Drain-gate voltage RGS = 20 kΩ ±VGS Gate-source voltage
ID Drain current (DC) Ths = 25 ˚C 2.0 1.7 ID Drain current (DC) Ths = 100 ˚C 1.3 1.1 IDM Drain current (pulse peak value) Ths = 25 ˚C 6.8 Ptot Total power dissipation Ths = 25 ˚C Tstg Storage temperature - 55 ˚C Tj Junction Temperature ˚C
THERMAL RESISTANCES SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Rth j-hs Thermal resistance junction to with heatsink compound 4.16 K/W heatsink
Rth j-a Thermal resistance junction to K/W
ambient
May 1995 Rev 1.200
Page Summary Contents For Philips Semiconductors BUK446-800A B Data Sheet
Manual Details
| Brand | Philips |
|---|---|
| Pages | 7 |
| File Size | 64.20 KB |
| Published | July 04, 2026 |
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Frequently Asked Questions
What is the maximum drain-source voltage (VDS)?
The maximum VDS is 800 V.
How do I find the device's resistance when it's on?
Check the R DS(ON) value; for BUK446-800A, it is 2.7 Ω at $V_{GS}=10V$.
What limits its sustained power output?
The maximum total power dissipation ($P_T$) is 30 W tot at 25 °C.
Is this device suitable for high-stress environments?
No, and it's explicitly warned against using the device in life support applications.