BY251
3.0 AMP SILICON RECTIFIERS
THRU
BY255
VOLTAGE RANGE
200 to 1300 Volts
CURRENT
FEATURES
* Low forward voltage drop
* High current capability
* High reliability
* High surge current capability
3.0 Amperes
DO-27
.220(5.6)
.197(5.0)
DIA.
1.0(25.4)
MIN.
MECHANICAL DATA
* Case: Molded plastic
* Epoxy: UL 94V-0 rate flame retardant
* Lead: Axial leads, solderable per MIL-STD-202,
method 208 guranteed
* Polarity: Color band denotes cathode end
* Mounting position: Any
* Weight: 1.10 grams
.375(9.5)
.285(7.2)
.052(1.3)
.048(1.2)
DIA.
1.0(25.4)
MIN.
Dimensions in inches and (millimeters)
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Rating 25 C ambient temperature uniess otherwies specified.
Single phase half wave, 60Hz, resistive or inductive load.
For capacitive load, derate current by 20%.
TYPE NUMBER
Maximum Recurrent Peak Reverse Voltage
Maximum RMS Voltage
Maximum DC Blocking Voltage
Maximum Average Forward Rectified Current
.375"(9.5mm) Lead Length at Ta=75 C
Peak Forward Surge Current, 8.3 ms single half sine-wave
superimposed on rated load (JEDEC method)
Maximum Instantaneous Forward Voltage at 3.0A
Maximum DC Reverse Current
Ta=25 C
at Rated DC Blocking Voltage
Ta=100 C
Typical Junction Capacitance (Note 1)
Typical Thermal Resistance R
θ
JA (Note 2)
Operating and Storage Temperature Range T
J
, T
STG
NOTES:
BY251
BY252
BY253
BY254
BY255
200
140
200
400
280
400
600
420
600
3.0
200
1.0
5.0
50
40
30
-65
+150
800
560
800
1300
910
1300
UNITS
V
V
V
A
A
V
µA
µA
pF
C/W
C
1. Measured at 1MHz and applied reverse voltage of 4.0V D.C.
2. Thermal Resistance from Junction to Ambient .375" (9.5mm) lead length.
124
RATING AND CHARACTERISTIC CURVES (BY251 THRU BY255)
FIG.1-TYPICAL FORWARD
CHARACTERISTICS
AVERAGE FORWARD CURRENT,(A)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
20
40
60
80
100
120
140
160
180
200
Single Phase
Half Wave 60Hz
Resistive Or Inductive Load
0.375"(9.5mm) Lead Length
FIG.2-TYPICAL FORWARD CURRENT DERATING CURVE
50
INSTANTANEOUS FORWARD CURRENT,(A)
10
3.0
1.0
Tj=25 C
Pulse Width 300us
1% Duty Cycle
AMBIENT TEMPERATURE,( C)
0.1
FIG.4-MAXIMUM NON-REPETITIVE FORWARD
SURGE CURRENT
PEAK FORWARD SURGE CURRENT,(A)
250
.01
.6
.7
.8
.9
1.0
1.1
1.2
1.3
FORWARD VOLTAGE,(V)
200
150
Tj=25 C
8.3ms Single Half
Sine Wave
JEDEC method
100
50
FIG.3 - TYPICAL REVERSE
CHARACTERISTICS
100
0
1
5
10
50
100
NUMBER OF CYCLES AT 60Hz
10
REVERSE LEAKAGE CURRENT, (
µ
A)
Tj=100 C
FIG.5-TYPICAL JUNCTION CAPACITANCE
140
120
100
80
60
40
20
0
1.0
.1
Tj=25 C
.01
0
JUNCTION CAPACITANCE,(pF)
20
40
60
80
100 120 140
.01
.05
.1
.5
1
5
10
50
100
PERCENT OF RATED PEAK REVERSE VOLTAGE,(%)
REVERSE VOLTAGE,(V)
125
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