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