BL
FEATURES
Low cost
Low leakage
GALAXY ELECTRICAL
31DF3 --- 31DF4
VOLTAGE RANGE: 300 --- 400 V
CURRENT: 1.5 A
SUPER FAST RECTIFIERS
DO - 27
Diffused junction
Low forward voltage drop
High current capability
Easily cleaned with alcohol,Isopropanol and
sim ilar solvents
MECHANICAL DATA
Case:JEDEC DO--27,m olded plastic
Terminals: Axial lead ,solderable per
MIL-STD-202,Method 208
Polarity: Color band denotes cathode
Weight: 0.041ounces,1.15 gram s
Mounting position: Any
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25
am bient tem perature unless otherwise specified.
Single phase,half wave,50Hz,resistive or inductive load. For capacitive load,derate by 20%.
31DF3
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
31DF4
400
280
400
1.5
UNITS
V
V
V
A
V
RRM
V
RMS
V
DC
I
F(AV)
300
210
300
Peak forw ard surge current
8.3ms single half-sine-w ave
superimposed on rated load
@T
J
=125
I
FSM
125.0
A
Maximum instantaneous forw ard voltage
@ I
F
=3A
Maximum reverse current
at rated DC blocking voltage
Maximum reverse recovery time
Typical junction capacitance
Typical thermal resistance
@T
A
=25
@T
A
=100
(Note1)
(Note2)
(Note3)
V
F
I
R
t
rr
C
J
R
θ
JA
T
J
T
STG
1.25
5.0
50.0
30
90
34
- 55 ----- + 150
- 55 ----- + 150
V
A
ns
pF
/W
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 1.0MH
Z
and applied rev erse v oltage of 4.0V DC.
3. Thermal resistance f rom junction to ambient.
Document Number 0264017
BL
GALAXY ELECTRICAL
1.
RATINGS AND CHARACTERISTIC CURVES
50
N 1.
10
N 1.
t
rr
31DF3 --- 31DF4
FIG.1 -- TEST CIRCUIT DIAGRAM AND REVERSE RECOVERY TIME CHARACTERISTIC
+ 0 .5A
D.U.T.
(+)
25VDC
(approx)
(-)
1
NONIN-
DUCTIVE
PULSE
GENERATOR
(NOTE2)
OSCILLOSCOPE
(NOTE 1)
0
-0.25 A
-1.0A
1cm
NOTES:1.RISE TIM = 7ns M .INPUT IM
E
AX
PEDANCE =1M . 22pF.
JJJJ
2.RISE TIM =10ns M .SOURCE IM
E
AX
PEDANCE=50 .
SE TIM BASEFO 10 ns/cm
T E
R
FIG.2 -- TYPICAL FORWARD CHARACTERISTIC
INSTANTANEOUS FORWARD CURRENT
AMPERES
AVERAGE FORWARD CURRENT
AMPERES
FIG.3 -- FORWARD DERATING CURVE
10
4
2
1
0.4
0.2
0.1
0.04
0.02
0.01
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
1.5
1.0
0.5
Single Phase
Half Wave 60HZ
Resistive or
Inductive Load
0.375"(9.5mm)Lead Length
0
25
50
7
5
100
1
25
150
T
J
=25
Pulse Width=300
µ
s
0
INSTANTANEOUS FORWARD VOLTAGE, VOLTS
AMBIENT TEMPERATURE,
FIG.4-- TYPICAL JUNCTION CAPACITANCE
1000
600
400
200
100
60
40
20
10
0.1 0.2
0.4
1
2
4
10
20
40
100
FIG.5-- PEAK FORWORD SURGE CURRENT
PEAKFORWORDSURGECURRENT
AMPERES
150
125
100
JUNCTION CAPACITANCE, pF
75
T
J
=25
f=1.0MHz
50
25
8.3ms Single Half
Sine - Wave
0
1
5
10
50
100
REVERSE VOLTAGE, VOLTS
NUMBER OF CYCLES AT 60H
Z
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Document Number 0264017
BL
GALAXY ELECTRICAL
2.
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