21201 Itasca St.
Chatsworth, CA 91311
Phone: (818) 701-4933
Fax: (818) 701-4939
RA251
THRU
RA257
25 Amp
Button Rectifier
50 to 1000 Volts
RA
Features
• Button Package For High Heat Dissipation
• High Current Capability
• Low Leakage
• Surge Rating Of 400 Amps
DIMENSIONS
INCHES MM
DIM MIN MAX MIN MAX NOTE
A 0.395 0.450 10.03 10.29
B 0.234 0.246 5.94 6.25
C 0.165 0.175 4.19 4.45
D 0.218 0.222 5.54 5.64
E --- 5°--- 5° NOM
Maximum Ratings
• Operating Temperature: -55°C to +175°C
• Storage Temperature: -55°C to +175°C
Microsemi
Part Number
Maximum
Recurrent
Peak Reverse
Voltage
Maximum
RMS Voltage
Maximum DC
Blocking
Voltage
RA251 50V 35V 50V
RA252 100V 70V 100V
RA253 200V 140V 200V
RA254 400V 280V 400V
RA255 600V 420V 600V
RA256 800V 560V 800V
RA257 1000V 700V 1000V
Electrical Character istics @ 25 °C U nless Otherwise Specified
Average Forward
Current IF(AV) 25.0A TJ = 150°C
Peak Forward Surge
Current IFSM 400A 8.3ms, half sine
Maximum Forward
Voltage Drop Per
Element VF1.0V IFM = 25A
TJ = 25°C*
Maximum DC
Reverse Current At
Rated DC Blocking
Voltage
IR10µA
1.0mA TJ = 25°C
TJ = 100°C
*Pulse test: Pulse width 300 µsec, Duty cycle 1%
A
BC
DE
Inst ant aneous Reverse Leakage Current - MicroAmperes versus
Percent Of Rated Peak Reverse Voltage - V ol ts
Average Forward Rectifi ed Current - Amperes versus
Case Tem perat ure - °C
Figure 3
Forward Derating Curve
50 75 125 150 175
25
0
5
10
15
Single Phase, Half Wave
60Hz Resistive or Inductive Load
Amps
°C
100
20
25
30
Instantaneous Forward Current - Amperes versus
Instantaneous Forward Voltage - Vol ts
Figure 1
Typical Forward Characteri stics
Volts
40
60
200
100
Amps
.2 1.2
.4 .6 .8 1.0
.1
.2
.4
.6
1
2
4
6
1
0
20 25°C
400
600
100
1.4
Figure 2
Typical Revers e Characteris tics
Volts
.4
.6
2
1
µAmps
20 120
40 60 80 100
.001
.002
.004
.006
.0
1
.02
.04
.06
.1
.2
4
6
10
140
TJ=25°C
1 100
4
0
100
200
300
8
Figure 4
Peak Forward Surge Current
Peak Forward Surge Current - Amperes versus
Number Of Cycles At 60Hz - Cycles
Amps
Cycles
2610 20 60 80
40
400
500
600
RA251 thru RA257
