Dimensions in millimeters and inches
Outline C  16
CASE STYLE AND DIMENSIONS
I
F(AV)
Rectangular
3.3
A
waveform
V
RRM
30/40
V
I
FSM
@ tp = 5 s sine
450
A
V
F
@
3 Apk, T
J
= 25C
0.57
V
T
J
 40 to 150
C
Characteristics
31DQ..
Units
The 31DQ.. axial leaded Schottky rectifier has been opti
mized for very low forward voltage drop, with moderate
leakage. Typical applications are in switching power sup
plies, converters, freewheeling diodes, and reverse
battery protection.
Low profile, axial leaded outline
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Very low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Description/Features
Major Ratings and Characteristics
SCHOTTKY RECTIFIER
3.3 Amp
31DQ03
31DQ04
Bulletin PD2.304 rev. E 03/03
1
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31DQ03, 31DQ04
Bulletin PD2.304 rev. E 03/03
2
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Part number
31DQ03
31DQ04
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
Voltage Ratings
30
40
V
FM
Max. Forward Voltage Drop
0.57
V
@ 3A
* See Fig. 1
(1)
0.71
V
@ 6A
0.51
V
@ 3A
0.62
V
@ 6A
I
RM
Max. Reverse Leakage Current
1
mA
T
J
= 25 C
* See Fig. 2
(1)
20
mA
T
J
= 125 C
C
T
Typical Junction Capacitance
190
pF
V
R
= 5V
DC
(test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance
9.0
nH
Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change
10000
V/s (Rated V
R
)
T
J
= 25 C
T
J
= 125 C
V
R
= rated V
R
Parameters
31DQ.. Units
Conditions
Electrical Specifications
(1) Pulse Width < 300s, Duty Cycle <2%
T
J
Max. Junction Temperature Range (*) 40 to 150
C
T
stg
Max. Storage Temperature Range
40 to 150
C
R
thJA
Max. Thermal Resistance Junction
80
C/W DC operation
to Ambient
Without cooling fins
R
thJL
Typical Thermal Resistance Junction
34
C/W With fin 20 x 20 (0.79 x 0.79) 1.0 (0.04) thick.
to Lead
Dimensions in millimeters (inches)
wt
Approximate Weight
1.2 (0.042) g (oz.)
Case Style
C  16
ThermalMechanical Specifications
Parameters
31DQ.. Units
Conditions
I
F(AV)
Max. Average Forward Current
3.3
A
50% duty cycle @ T
C
= 73C, rectangular wave form
* See Fig. 4
I
FSM
Max. Peak One Cycle NonRepetitive
450
5s Sine or 3s Rect. pulse
Surge Current * See Fig. 6
90
10ms Sine or 6ms Rect. pulse
E
AS
NonRepetitive Avalanche Energy
6.0
mJ
T
J
= 25 C, I
AS
= 1.0 Amps, L = 12 mH
I
AR
Repetitive Avalanche Current
1.0
A
Current decaying linearly to zero in 1 sec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
A
Parameters
31DQ..
Units
Conditions
<
thermal runaway condition for a diode on its own heatsink
(*) dPtot
1
dTj
Rth( ja)
31DQ03, 31DQ04
Bulletin PD2.304 rev. E 03/03
3
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Fig. 1  Max. Forward Voltage Drop Characteristics
Forward Voltage Drop  V
FM
(V)
Instantaneous Forward Current  I
F
(A)
Reverse Voltage  V
R
(V)
Reverse Voltage  V
R
(V)
Junction Capacitance  C
T
(pF)
Fig. 3  Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 2  Typical Values Of Reverse Current
Vs. Reverse Voltage
Reverse Current  I
R
(mA)
0.1
1
10
100
0
0.3
0.6
0.9
1.2
T = 150C
T = 125C
T = 25C
J
J
J
0.001
0.01
0.1
1
10
100
0
10
20
30
40
25C
T = 150C
J
125C
10
100
1000
0
40
80
120
160
200
T = 25C
J
31DQ03, 31DQ04
Bulletin PD2.304 rev. E 03/03
4
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Average Forward Current  I
F
(AV)
(A)
Square Wave Pulse Duration  t
p
(microsec)
Fig. 6  Max. NonRepetitive Surge Current
Allowable Lead Temperature (C)
NonRepetitive Surge Current  I
FSM
(A)
Fig. 5 Forward Power Loss
Characteristics
Average Forward Current  I
F
(AV)
(A)
Average Power Loss (Watts)
(2) Formula used: T
C
= T
J
 (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1  D); I
R
@ V
R1
= 80% rated V
R
Fig. 4  Max. Allowable Lead Temperature
Vs. Average Forward Current
0
30
60
90
120
150
0
1
2
3
4
5
DC
see note (2)
Square wave (D = 0.50)
80% Rated V applied
R
0
0.5
1
1.5
2
2.5
0
1
2
3
4
5
DC
RMS Limit
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
10
100
1000
10
100
1000
10000
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
31DQ03, 31DQ04
Bulletin PD2.304 rev. E 03/03
5
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IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 2527105
TAC Fax: (310) 2527309
Visit us at www.irf.com for sales contact information. 03/03
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level.
Qualification Standards can be found on IR's Web site.
Ordering Information Table
Device Code
1
5
2
4
3
1

31 = 3.1A (Axial and small packages  Current is x10)
2

D = DO41 package
3

Q = Schottky Q.. Series
4

04 = Voltage Ratings
5

TR = Tape & Reel package (1200 pcs)

= Box package (500 pcs)
31
D
Q
04
TR
04 = 40V
03 = 30V