BY251
THRU
BY255
3.0 AMPS. Silicon Rectifiers
Voltage Range
200 to 1300 Volts
Current
3.0Amperes
Features
a
a
a
a
a
a
a
a
a
Low forward voltage drop
High current capability
High reliability
High surge current capability
DO-201AD
Mechanical Data
Cases: Molded plastic
Epoxy: UL 94V-O rate flame retardant
Lead: Axial leads, solderable per MIL-
Lead:
STD-202, Method 208 guaranteed
Polarity: Color band denotes cathode end
High temperature soldering guaranteed:
250°C/10 seconds/.375”,(9.5mm) lead
lengths at 5 lbs., (2.3kg) tension
Weight: 1.2 grams
a
Dimensions in inches and (millimeters)
Maximum Ratings and Electrical Characteristics
Rating at 25°C ambient temperature unless otherwise specified.
Single phase, half wave, 60 Hz, 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 @T
A
= 75°C
Peak Forward Surge Current, 8.3 ms Single
Half Sine-wave Superimposed on Rated Load
(JEDEC method )
Maximum Instantaneous Forward Voltage
@ 3.0A
Maximum DC Reverse Current @ T
A
=25°C
at Rated DC Blocking Voltage @ T
A
=100°C
Maximum Full Load Reverse Current, Full
Cycle Average .375”(9.5mm) Lead Length
@T
L
=75°C
Typical Junction Capacitance ( Note 1 )
Typical Thermal Resistance RÛJA ( Note 2 )
Operating Temperature Range T
J
Storage Temperature Range T
STG
BY251
200
140
200
BY252
400
280
400
BY253
600
420
600
3.0
150
1.0
5.0
100
30
50
18
-65 to +150
-65 to +150
BY254
800
560
800
BY255
1300
910
1300
Units
V
V
V
A
A
V
uA
uA
uA
pF
°C/W
°C
°C
Notes: 1. Measured at 1 MHz and Applied Reverse Voltage of 4.0 V D.C.
Notes:
2. Thermal Resistance from Junction to Ambient .375” (9.5mm) Lead Length.
- 298 -
RATINGS AND CHARACTERISTIC CURVES (BY251 THRU BY255)
AVERAGE FORWARD CURRENT AMPERES
4
PEAK FORWARD SURGE CURRENT. (A)
FIG.1- MAXIMUM FORWARD CURRENT
DERATING CURVE
FIG.2- MAXIMUM FORWARD SURGE
CURRENT
150
100
NON-REPETITIVE
3
2
Single Phase
Half Wave 60Hz
Resistive or
Inductive Load
0.375" (9.5mm)
Lead Length
0
25
50
75
100
o
50
Tj=25
o
C
8.3ms Single Half
Sine Wave
JEDEC Method
10
1
5
10
REPETITIVE
1
0
125
150
175
AMBIENT TEMPERATURE. ( C)
50
100
NUMBER OF CYCLES AT 60Hz
FIG.3- TYPICAL FORWARD CHARACTERISTICS
100
100
FIG.4- TYPICAL JUNCTION CAPACITANCE
JUNCTION CAPACITANCE.(pF)
INSTANTANEOUS FORWARD CURRENT. (A)
30
10
3.0
1.0
Tj=25
o
C
Pulse Width=300 s
1% Duty Cycle
50
10
5
Tj=25
0
C
1
.1
.03
1
5
10
REVERSE VOLTAGE. (V)
50
100
FIG.5- TYPICAL REVERSE CHARACTERISTICS
INSTANTANEOUS REVERSE CURRENT. ( A)
100
Tj=100
0
C
.6
.8
1.0
1.2
1.4
FORWARD VOLTAGE. (V)
1.6
1.8
.01
.4
1.0
.1
Tj=25
0
C
.01
0
20
40
60
80
100
120
140
PERCENT OF RATED PEAK REVERSE VOLTAGE. (%)
- 299-
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