RECTRON
SEMICONDUCTOR
TECHNICAL SPECIFICATION
FR251
THRU
FR257
FAST RECOVERY RECTIFIER
VOLTAGE RANGE 50 to 1000 Volts CURRENT 2.5 Amperes
FEATURES
*
*
*
*
*
*
Fast switching
Low leakage
Low forward voltage drop
High current capability
High current surge
High reliability
R-3
MECHANICAL DATA
*
*
*
*
*
Case: Molded plastic
Epoxy: Device has UL flammability classification 94V-O
Lead: MIL-STD-202E method 208C guaranteed
Mounting position: Any
Weight: 0.54 gram
1.0 (25.4)
MIN.
.042 (1.1)
DIA.
.040 (1.0)
.160 (4.1)
.138 (3.5)
.160 (4.1)
DIA.
.138 (3.5)
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25
o
C ambient temperature unless otherwise specified.
Single phase, half wave, 60 Hz, resistive or inductive load.
For capacitive load, derate current by 20%.
1.0 (25.4)
MIN.
Dimensions in inches and (millimeters)
MAXIMUM RATINGS
(At T
A
= 25
o
C unless otherwise noted)
RATINGS
Maximum Recurrent Peak Reverse Voltage
Maximum RMS Voltage
Maximum DC Blocking Voltage
Maximum Average Forward Rectified Current
o
at T
A
= 75 C
Peak Forward Surge Current 8.3 ms single half sine-wave
superimposed on rated load (JEDEC method)
Typical Junction Capacitance (Note 2)
Operating and Storage Temperature Range
SYMBOL
V
RRM
V
RMS
V
DC
I
O
I
FSM
C
J
T
J
, T
STG
FR251 FR252 FR253 FR254 FR255 FR255P FR256 FR257 FR257P UNITS
50
35
50
100
70
100
200
140
200
400
280
400
600
420
600
2.5
150
60
-55 to + 150
600
420
600
800
560
800
1000
700
1000
1000
700
1000
Volts
Volts
Volts
Amps
Amps
pF
0
C
ELECTRICAL CHARACTERISTICS
(At T
A
= 25 C unless otherwise noted)
CHARACTERISTICS
Maximum Instantaneous Forward Voltage at 2.5A DC
Maximum DC Reverse Current
at Rated DC Blocking Voltage T
A
= 25
o
C
Maximum Full Load Reverse Current Average,
Full Cycle .375” (9.5mm) lead length at T
L
= 55
o
C
Maximum Reverse Recovery Time (Note 1)
NOTES : 1. Test Conditions: I
F
= 0.5A, I
R
= -1.0A, I
RR
= -0.25A
2. Measured at 1 MH
Z
and applied reverse voltage of 4.0 volts
SYMBOL
V
F
FR251 FR252 FR253 FR254 FR255 FR255P FR256 FR257 FR257P UNITS
1.3
Volts
5.0
I
R
100
trr
150
250
150
500
250
uAmps
nSec
2002-11
uAmps
o
RATING AND CHARACTERISTIC CURVES ( FR251 THRU FR257 )
FIG. 1 - TYPICAL FORWARD CURRENT
DERATING CURVE
AVERAGE FORWARD CURRENT, (A)
FIG. 3 - MAXIMUM NON-REPETITIVE FORWARD
SURGE CURRENT
150
PEAK FORWARD SURGE
CURRENT, (A)
2.5
2.0
1.5
1.0
.5
0
Single Phase
Half Wave 60Hz
Resistive or
Inductive Load
125
100
75
50
25
0
8.3ms Single Half Sine-Wave
(JEDEC Method)
0
25 50 75 100 125 150 175
AMBIENT TEMPERATURE, ( )
FIG. 3 - TYPICAL INSTANTANEOUS
FORWARD CHARACTERISTICS
JUNCTION CAPACITANCE, (pF)
1
2
5
10
20
50
NUMBER OF CYCLES AT 60Hz
100
INSTANTANEOUS FORWARD CURRENT, (A)
FIG. 4 - TYPICAL JUNCTION CAPACITANCE
200
100
60
40
20
10
6
4
2
1
.1
.2
.4
1.0 2
4
10
20
REVERSE VOLTAGE, ( V )
40
100
TJ = 25
20
10
3.0
1.0
0.3
0.1
.03
.01
0.4
0.6
0.8
1.0
1.2
1.4
1.6 1.8
TJ = 25
Pulse Width=300uS
1% Duty Cycle
INSTANTANEOUS FORWARD VOLTAGE, (V)
FIG. 5 - TEST CIRCUIT DIAGRAM AND REVERSE RECOVERY TIME CHARACTERISTIC
50
NONINDUCTIVE
10
NONINDUCTIVE
trr
+0.5A
(-)
(+)
25 Vdc
(approx)
(-)
D.U.T
0
PULSE
GENERATOR
(NOTE 2)
-0.25A
1
NON-
INDUCTIVE
OSCILLOSCOPE
(NOTE 1)
(+)
-1.0A
NOTES:
1 Rise Time = 7ns max. Input Impedance =
1 megohm. 22pF.
2. Rise Time = 10ns max. Source Impedance =
50 ohms.
1cm
SET TIME BASE FOR
50/100 ns/cm
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