BY251 THRU BY255
Features
Mechanical Data
· Low cost
· Diffused junction
· High current capability
· The plastic material carries U/L recognition 94V-0
Maximum Ratings And Electrical Characteristics
· Case : JEDEC DO-201AD molded plastic body
· Terminals : Plated axial lead solderable per MIL-STD-750,
method 2026
· Polarity : Color band denotes cathode end
· Mounting Position : Any
· Weight : 0.042 ounce, 1.1 grams
(Ratings at 25℃ ambient temperature unless otherwise specified, Single phase, half wave 60Hz, resistive or inductive
load. For capacitive load, derate by 20%)
Notes:
(1) Measured at 1MHz and applied reverse voltage of 4.0V DC.
CURRENT 3.0 Amperes
VOLTAGE 200 to 1300 Volts
Maximum recurrent peak reverse voltage
Volts
Peak forward surge current 8.3ms half sine
wave superimposed on rated load
Maximum average forward rectified current
at T
A
=50℃
Maximum instantaneous forward voltage
at 3.0A
V
RRM
200 Volts
Symbols BY251 Units
1.1V
F
3.0
Amps100.0I
FSM
T
J
T
STG
-50 to +150 ℃
Maximum reverse current at rated DC
blocking voltage
Typical thermal resistance
Typical junction capacitance (Note 1)
Operating and storage temperature range
BY252 BY253 BY254
10.0
30.0
400 600 800
μA
℃/W
pF
I
(AV)
I
R
Rθ
JA
30.0
C
J
Recurrent peak Forward Current Amps
Amps
20.0I
FRM
BY255
1000
Dimensions in inches and (millimeters)
DO-201AD
1.0(25.4)
MIN.
1.0(25.4)
MIN.
0.375(9.5)
0.285(7.2)
0.042(1.1)
0.037(0.9)
DIA.
0.210(5.3)
0.188(4.8)
DIA.
FIG.1-FORWARD CURRENT DERATING CURVE
1000 25 1751501257550
4
0
1
3
2
LEAD TEMPERATURE ( ℃)
AVERAGE FORWARD CURRENT AMPERES
Ror L-Load
C-Load
10mm
10mm
TJ=25℃
FIG.2-TYPICAL FORWARD CHARACTERISTICS
INSTANTANEOUS FORWARD CURRENT(AMPERES)
TJ=150℃
Typ.values
0.01
0.1
10
1
100
0.001
1.40.6 0.8 1.61.21.00.2 0.4
INSTANTANEOUS FORWARD VOLTAGE (VOLTS)
FIG.3-MAXIMUM NON-REPETITIVE FORWARD
SURGE CURRENT
NUMBER OF CYCLES AT 50Hz
Permissible surge current(A)
101 1002042
100
20
40
200
400
1000
T
J
=25℃
I
FM
1 Cycle
FIG.4-TYPICAL THERMAL RESISTANCE
L, LEAD LENGTH (mm)
R
0JA
THERMAL RESISTANCE JUNCTION AMBIENT(℃/W)
250 5 30201510
0
10
30
20
50
40
Typ
LL
Max
RATINGS AND CHARACTERISTIC CURVES BY251 THRU BY255
