Fairchild KBU8A, KBU8M service manual
Features
• High surge current capability.
• Reliable construction technique.
• Ideal for printed circuit board.
Bridge Rectifiers
KBU8A - KBU8M
~
KBU
KBU8A - KBU8M
~
+
Absolute Maximum Ratings* T
Symbol
V
Maximum Repetitive Reverse Voltage 50 100 200 400 600 800 1000 V
RRM
V
Maximum RMS Bridge Input Voltage 35 70 140 280 420 560 700 V
RMS
Parameter
= 25°C unless otherwise noted
A
8A 8B 8D 8G 8J 8K 8M
Value
Units
VR DC Reverse Voltage (Rated VR) 50 100 200 400 600 800 1000 V
I
Average Rectified Forward Current, @ TA = 50°C 8.0 A
F(AV)
I
Non-repetitive Peak Forward Surge Current 300 A
FSM
T
stg
Storage Temperature Range -55 to +150
TJ Operating Junction Temperature -55 to +150
C
°
C
°
*These ratings are limiting values above which the serviceability of any semiconductor device may be impaired.
Thermal Characteristics
Symbol
PD Power Dissipation 6.9 W
R
JA
θ
R
JL
θ
Thermal Resistance, Junction to Ambient,* per leg 18
Thermal Resistance, Junction to Lead,* per leg 3.0
*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 T
Parameter
= 25°C unless otherwise noted
A
Value
Units
C/W
°
C/W
°
Symbol Parameter Device Units
VF Forward Voltage, per bridge @ 8.0 A 1.0 V
IR
Reverse Current, total bridge @ rated V
R
TA = 25°C
T
= 100°C
A
10
500
KBU8A-KBU8M, Rev. C2001 Fairchild Semiconductor Corporation
A
µ
A
µ
T ypical Characteristics
KBU8A - KBU8M
Bridge Rectifiers
(continued)
8
[A]
F
6
4
SINGLE PHASE
HALF WAVE
60Hz
2
RESISTIVE OR
INDUCTIVE L OAD
LENGTHS
0
0 50 100 150
Average Rectified Forward Current, I
Ambient Temperature [ºC]
100
[A]
F
10
1
T = 25 C
T = 25 C
º
º
J
Forward Current, I
0.1
0.6 0.7 0.8 0.9 1 1.1 1.2 1.3
A
Pulse Width = 300
2% Duty Cy c le
µµµµ
S
Forward Voltage, VF [V]
Figure 1. Forward Current Derating Curve Figure 2. Forward Voltage Characteristics
300
[A]
250
FSM
200
150
100
50
0
Peak Forward Surge Current, I
1 2 5 10 20 50 100
Number of Cycles at 60Hz
100
T = 100 C
º
A
10
[mA]
R
1
T = 25 C
º
A
Reverse Current, I
0.1
0 20406080100120140
Percent of Rated Peak Reverse Voltage [%]
Figure 3. Non-Repetitive Surge Current Figure 4. Reverse Current vs Reverse Voltage
2001 Fairchild Semiconductor Corporation
KBU8A-KBU8M, Rev. C
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