Fairchild KBU8A - KBU8M Data Handbook
Summary
These KBU8A–KBU8M Bridge Rectifiers are reliable power components designed for printed circuit board applications, offering high surge current capability and robust construction. This comprehensive datasheet is essential reference material for electrical engineers and designers. It provides detailed absolute maximum ratings, thermal characteristics, and critical performance curves—including forward/reverse voltage, rectification efficiency, and non-repetitive surge performance data—to ensure optimal component selection and proper system integration in power conversion circuits.
Page 1 Text Content
KBU8A - KBU8M
Features High surge current capability. Reliable construction technique. • Ideal for printed circuit board.
Bridge Rectifiers Absolute Maximum Ratings* TA = 25°C unless otherwise noted
Value
Symbol Parameter Units 8A 8B 8D 8G 8J 8K 8M VRRM Maximum Repetitive Reverse Voltage 50 100 200 400 600 800 1000 V VRMS Maximum RMS Bridge Input Voltage 35 70 140 280 420 560 700 V VR DC Reverse Voltage (Rated VR) 50 100 200 400 600 800 1000 V IF(AV) Average Rectified Forward Current, @ TA = 50°C 8.0 A IFSM Non-repetitive Peak Forward Surge Current 300 A Tstg Storage Temperature Range -55 to +150 °C TJ Operating Junction Temperature -55 to +150 °C *These ratings are limiting values above which the serviceability of any semiconductor device may be impaired.
Thermal Characteristics Symbol Parameter Value Units PD Power Dissipation 6.9 W RθJA Thermal Resistance, Junction to Ambient,* per leg 18 °C/W RθJL Thermal Resistance, Junction to Lead,* per leg 3.0 °C/W *Device mounted on PCB with 0.375 " (9.5 mm) lead length and 0.5 x 0.5" (13 x 13 mm) copper pads.
Electrical Characteristics TA = 25°C unless otherwise noted Symbol Parameter Device Units VF Forward Voltage, per bridge @ 8.0 A 1.0 V IR Reverse Current, total bridge @ rated VR
TA = 25°C µA TA = 100°C µA
KBU8A-KBU8M, Rev. C2001 Fairchild Semiconductor Corporation
Page Summary Contents For Fairchild KBU8A - KBU8M Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 3 |
| File Size | 51.23 KB |
| Published | July 12, 2026 |
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Frequently Asked Questions
What is the maximum non-repetitive surge current?
The peak forward surge current (I(FSM)) is rated at 300 A.
Are these listed electrical values absolute limits?
No; they are limiting values above which the serviceability of any semiconductor device may be impaired.
What is the operating temperature range (junction)?
The operational junction temperature range (Tj) is -55 to +150°C.
Can this rectifier be used in life support systems?
Its use as a critical component in life support devices requires explicit written approval from Fairchild Semiconductor Corporation.