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FEATURES
Low cost
GALAXY ELECTRICAL
FR251---FR257
VOLTAGE RANGE: 50 --- 1000 V
CURRENT: 2.5 A
FAST RECOVERY RECTIFIER
R-3
Diffused junction
Low leakage
Low forward voltage drop
High current capability
Easily cleaned with Freon,Alcohol,Isopropanol
and similar solvents
The plastic material carries U/L recognition 94V-0
MECHANICAL DATA
Case:JEDEC R--3,molded plastic
Terminals: Axial lead ,solderable per
MIL- STD-202,Method 208
Polarity: Color band denotes cathode
Weight:0.021 unces,0.58 grams
Mounting position: Any
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25
ambient temperature unless otherwise specified.
Single phase,half wave,60 Hz,resistive or inductive load. For capacitive load,derate by 20%.
FR
251
Maximum recurrent peak reverse voltage
Maximum RMS voltage
Maximum DC blocking voltage
Maximum average forw ard rectified current
9.5mm lead length,
@T
A
=75
FR
252
100
70
100
FR
253
200
140
200
FR
254
400
280
400
2.5
FR
255
600
420
600
FR
256
800
560
800
FR
257
1000
700
1000
UNITS
V
V
V
A
V
RRM
V
RMS
V
DC
I
F(AV)
50
35
50
Peak forw ard surge current
8.3ms single half-sine-w ave
superimposed on rated load
@T
J
=125
I
FSM
150.0
A
Maximum instantaneous forw ard voltage
@ 2.5 A
Maximum reverse current
at rated DC blocking voltage
@T
A
=25
@T
A
=100
V
F
I
R
t
rr
C
J
R
θ
JA
T
J
T
STG
150
1.3
5.0
100.0
250
22
35
- 55---- +150
- 55---- + 150
500
V
A
ns
pF
／Ｗ
Maximum reverse recovery time (Note1)
Typical junction capacitance
Typical thermal resistance
(Note2)
(Note3)
Operating junction temperature range
Storage temperature range
NOTE:1. Measured with I
F
=0.5A, I
R
=1A, I
rr
=0.25A.
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2. Measured at 1.0MHz and applied rev erse v oltage of 4.0V DC.
3. Thermal resistance f rom junction to ambient.
Document Number 0261005
BL
GALAXY ELECTRICAL
1.
RATINGS AND CHARACTERISTIC CURVES
FIG.1 -- TYPICAL FORWARD DERATING CURVE
PEAK FORWARD SURGE CURRENT
AMPERES
FR251---FR257
FIG.2-- FORWARD SURGE CURRENT
AVERAGE FORWARD CURRENT
AMPERES
2.5
150
125
100
75
50
25
0
1
2
4
6
8 10
20
40 60
100
TJ=125
8.3ms Single Half
Sine-Wave
2.0
1.5
1.0
0.5
Single Phase
Half Wave 60H
Z
Resistive or
Inductive Load
0
25
50
75
0
100
125
150
175
AMBIENT TEMPERATURE,
FIG.3--TYPICAL JUNCTION CAPACITANCE
INSTANTANEOUS FORWARD CURRENT
AMPERES
NUMBER OF CYCLES AT 60 Hz
FIG.4 --TYPICAL FORWARD CHARACTERISTIC
10 0
10
T
J
=25
Pulse Width=300
µ
S
100
JUNCTION CAPACITANCE,pF
60
40
4
2
1 .0
0.4
0.2
0.1
0 .06
0.04
0 .02
0.0 1
0.6 0.8
1.0
1.2
1.4
1.6
1.8
2.0
20
10
4
TJ=25
f=1MHz
2
1
.1
.2
.4
1.0
2
4
10
20
40
100
REVERSE VOLTAGE,VOLTS
INSTANTANEOUS FORWARD VOLTAGE,VOLTS
FIG.5 -- REVERSE RECOVERY TIME CHARACTERISTIC AND TEST CIRCUIT DIAGRAM
50
N.1.
10
N.1.
t
rr
+0.5A
D.U.T.
(+)
50VDC
(APPROX)
(-)
1
N.1.
( - )
0
PULSE
GENERATOR
(NOTE2)
OSCILLOSCOPE
(NOTE 1)
( + )
-0.25A
-1.0A
1cm
N S:1.R TIM =7ns M IN U IM E AN E
OTE
ISE E
AX. P T P D C =1M .22pF
2.R TIM =10ns M SOU C IM E AN E
ISE E
AX.
R E P D C =5O
SE TIM BASEFOR50/100 ns /cm
T E
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Document Number 0261005
BL
GALAXY ELECTRICAL
2.
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