Page 1
FR251 - FR257-STR
FAST RECOVERY
RECTIFIER DIODES
PRV : 50 - 1000 Volts
Io : 2.5 Amperes
FEATURES :
MECHANICAL DATA :
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%.
FR257
-STR
Notes :
D2A
* High current capability
* High surge current capability
* High reliability
* Low reverse current
* Low forward voltage drop
* Fast switching for high efficiency
* Case : D2A Molded plastic
* Epoxy : UL94V-O rate flame retardant
* Lead : Axial lead solderable per MIL-STD-202,
Method 208 guaranteed
* Polarity : Color band denotes cathode end
* Mounting position : Any
* Weight : 0.645 gram
RATING
Maximum Recurrent Peak Reverse Voltage V
Maximum RMS Voltage V
Maximum DC Blocking Voltage V
Maximum Average Forward Current
0.375"(9.5mm) Lead Length Ta = 55 °C
Peak Forward Surge Current,
8.3ms Single half sine wave Superimposed
on rated load (JEDEC Method)
Maximum Peak Forward Voltage at IF = 2.5 A V
Maximum DC Reverse Current Ta = 25 °C
at Rated DC Blocking Voltage Ta = 100 °C
Maximum Reverse Recovery Time ( Note 1 )
Typical Junction Capacitance ( Note 2 ) C
Junction Temperature Range T
Storage Temperature Range T
SYMBOL FR251 FR252 FR253 FR254 FR255 FR256 FR257
F(AV)
I
I
I
RRM
RMS
DC
FSM
R
I
R(H)
Trr
STG
0.161 (4.1)
0.154 (3.9)
0.040 (1.02)
0.0385 (0.98)
1.00 (25.4)
MIN.
0.284 (7.2)
0.268 (6.8)
1.00 (25.4)
MIN.
Dimensions in inches and ( millimeters )
UNIT
50 100 200 400 600 800 1000 1000 V
35 70 140 280 420 560 700 700 V
50 100 200 400 600 800 1000 1000 V
A2.5
100
F
150 250 500 250 ns
J
J
1.3 V
10
500
28 pf
- 65 to + 150
- 65 to + 150
A
µA
µA
°C
°C
( 1 ) Reverse Recovery Test Conditions : IF = 0.5 A, IR = 1.0 A, Irr = 0.25 A.
( 2 ) Measured at 1.0 MHz and applied reverse voltage of 4.0 V
Page 1 of 2 Rev. 01 : April 2, 2002
DC
Page 2
RATING AND CHARACTERISTIC CURVES ( FR251 - FR257 )
+
20
+ 0.5 A
0
- 0.25 A
- 1.0 A
1 cm
FIG.1 - REVERSE RECOVERY TIME CHARACTERISTIC AND TEST CIRCUIT DIAGRAM
50 Ω 10 Ω
D.U.T.
50 Vdc
(approx)
1 Ω
NOTES : 1. Rise Time = 7 ns max., Input Impedance = 1 megaohm, 22 pF.
2. Rise time = 10 ns max., Source Impedance = 50 ohms.
3. All Resistors = Non-inductive Types.
OSCILLOSCOPE
( NOTE 1 )
PULSE
GENERATOR
( NOTE 2 )
Trr
SET TIME BASE FOR 50/100 ns/cm
FIG.2 - DERATING CURVE FOR OUTPUT FIG.3 - MAXIMUM NON-REPETITIVE PEAK
RECTIFIED CURRENT FORWARD SURGE CURRENT
2.5
2.0
1.5
1.0
0.5
CURRENT, AMPERES
AVERAGE FORWARD OUTPUT
60Hz RESISTIVE OR INDUCTIVE LOAD
0
0 25 50 75 100 125 150 175 1 2 4 6 10 20 40 60 100
AMBIENT TEMPERATURE, ( °C)
100
80
60
40
CURRENT, AMPERES
20
PEAK FORWARD SURGE
0
8.3 ms SINGLE HALF SINE WAVE
NUMBER OF CYCLES AT 60Hz
Ta = 50 °C
FIG.4 - TYPICAL FORWARD CHARACTERISTICS FIG.5 - TYPICAL REVERSE CHARACTERISTICS
100 10
Pulse Width = 300 µs
10
1.0
2% Duty Cycle
TJ = 25 °C
1.0
0.1
MICROAMPERES
TJ = 100 °C
TJ = 25 °C
REVERSE CURRENT,
0.1
FORWARD CURRENT, AMPERES
0.01
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.01
PERCENT OF RATED REVERSE VOLTAGE, (%)
FORWARD VOLTAGE, VOLTS
Page 2 of 2 Rev. 01 : April 2, 2002
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