Fairchild KBU4A-KBU4M Bridge Rectifiers Data Handbook
Summary
Engineered for reliable power conversion, this datasheet details the KBU Bridge Rectifier series, ideal for high-current applications in printed circuit boards. The manual provides comprehensive specifications covering electrical characteristics, thermal performance, and impressive non-repetitive surge current handling across multiple voltage ratings. It serves as an essential technical resource for electronics designers needing to select and integrate robust semiconductor components into DC power systems.
Page 1 Text Content
KBU4A - KBU4M
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 4A 4B 4D 4G 4J 4K 4M 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 4.0 A IFSM Non-repetitive Peak Forward Surge Current 200 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 6.6 W RθJA Thermal Resistance, Junction to Ambient,* per leg 19 °C/W RθJL Thermal Resistance, Junction to Lead,* per leg 4.0 °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 @ 4.0 A 1.0 V IR Reverse Current, total bridge @ rated VR
TA = 25°C
TA = 100°C
KBU4A-KBU4M, Rev. C2001 Fairchild Semiconductor Corporation
Page Summary Contents For Fairchild KBU4A-KBU4M Bridge Rectifiers Data Handbook
Manual Details
| Brand | Fairchild |
|---|---|
| Pages | 3 |
| File Size | 49.48 KB |
| Published | June 06, 2026 |
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Frequently Asked Questions
Can these rectifiers be used in life support systems?
No, they are not authorized for use as critical components in life support devices or systems without express written approval from Fairchild Semiconductor Corporation.
What is the maximum non-repetitive peak forward surge current it can handle?
The component has a Non-repetitive Peak Forward Surge Current rating of 200 A.
How do I calculate the allowable power dissipation during operation?
The device exhibits a Power Dissipation of 6.6 W, and the thermal resistance from Junction to Ambient is estimated at 19 °C/W per leg.