Bulletin PD-2.304 rev. E 03/03
31DQ03
31DQ04
SCHOTTKY RECTIFIER
3.3 Amp
Major Ratings and Characteristics
Characteristics
I
F(AV)
Rectangular
waveform
V
RRM
I
FSM
@ tp = 5 µs sine
V
F
T
J
@ 3 Apk, T
J
= 25°C
Description/Features
Units
A
V
A
V
°C
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, free-wheeling 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
31DQ..
3.3
30/40
450
0.57
- 40 to 150
CASE STYLE AND DIMENSIONS
Outline C - 16
Dimensions in millimeters and inches
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31DQ03, 31DQ04
Bulletin PD-2.304 rev. E 03/03
Voltage Ratings
Part number
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
31DQ03
30
31DQ04
40
Absolute Maximum Ratings
Parameters
I
F(AV)
Max. Average Forward Current
* See Fig. 4
I
FSM
E
AS
I
AR
Max. Peak One Cycle Non-Repetitive
Surge Current * See Fig. 6
Non-Repetitive Avalanche Energy
Repetitive Avalanche Current
450
90
6.0
1.0
A
mJ
A
5µs Sine or 3µs Rect. pulse
Following any rated
load condition and with
10ms Sine or 6ms Rect. pulse rated V
RRM
applied
31DQ..
3.3
Units
A
Conditions
50% duty cycle @ T
C
= 73°C, rectangular wave form
T
J
= 25 °C, I
AS
= 1.0 Amps, L = 12 mH
Current decaying linearly to zero in 1 µsec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
Electrical Specifications
Parameters
V
FM
Max. Forward Voltage Drop
* See Fig. 1
(1)
31DQ.. Units
0.57
0.71
0.51
0.62
1
20
190
9.0
10000
V
V
V
V
mA
mA
pF
nH
V/µs
@ 3A
@ 6A
@ 3A
@ 6A
Conditions
T
J
= 25 °C
T
J
= 125 °C
I
RM
C
T
L
S
Max. Reverse Leakage Current
* See Fig. 2
(1)
Typical Junction Capacitance
Typical Series Inductance
T
J
= 25 °C
V
R
= rated V
R
T
J
= 125 °C
V
R
= 5V
DC
(test signal range 100Khz to 1Mhz) 25°C
Measured lead to lead 5mm from package body
(Rated V
R
)
dv/dt Max. Voltage Rate of Change
(1) Pulse Width < 300µs, Duty Cycle <2%
Thermal-Mechanical Specifications
Parameters
T
J
T
stg
Max. Storage Temperature Range
31DQ.. Units
°C
°C
-40 to 150
80
34
Conditions
Max. Junction Temperature Range (*) -40 to 150
R
thJA
Max. Thermal Resistance Junction
to Ambient
R
thJL
Typical Thermal Resistance Junction
to Lead
wt
Approximate Weight
Case Style
(*) dPtot
dTj
<
1
Rth( j-a)
°C/W DC operation
Without cooling fins
°C/W With fin 20 x 20 (0.79 x 0.79) 1.0 (0.04) thick.
Dimensions in millimeters (inches)
1.2 (0.042) g (oz.)
C - 16
thermal runaway condition for a diode on its own heatsink
2
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31DQ03, 31DQ04
Bulletin PD-2.304 rev. E 03/03
100
100
Reverse Current - I
R
(mA)
T J = 150˚C
10
1
125˚C
0.1
0.01
25˚C
Instantaneous Forward Current - I
F
(A)
10
0.001
0
10
20
30
40
Reverse Voltage - V
R
(V)
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage
T
J
= 150˚C
T
J
= 125˚C
1
T
J
= 25˚C
1000
Junction Capacitance - C
T
(pF)
T = 25˚C
J
100
0.1
0
0.3
0.6
0.9
1.2
Forward Voltage Drop - V
FM
(V)
Fig. 1 - Max. Forward Voltage Drop Characteristics
10
0
40
80
120
160
200
Reverse Voltage - V
R
(V)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
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31DQ03, 31DQ04
Bulletin PD-2.304 rev. E 03/03
150
Allowable Lead Temperature (°C)
Average Power Loss (Watts)
2.5
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
RMS Limit
DC
120
DC
2
90
1.5
60
Square wave (D = 0.50)
80% Rated V applied
R
1
30
see note (2)
0.5
0
0
1
2
3
4
5
Average Forward Current - I
F
(AV)
(A)
Fig. 4 - Max. Allowable Lead Temperature
Vs. Average Forward Current
0
0
1
2
3
4
5
Average Forward Current - I
F
(AV)
(A)
Fig. 5- Forward Power Loss
Characteristics
1000
Non-Repetitive Surge Current - I
FSM
(A)
100
At Any Rated Load Condition
And With Rated VRRM Applied
Following Surge
10
10
100
1000
10000
Square Wave Pulse Duration - t
p
(microsec)
Fig. 6 - Max. Non-Repetitive Surge Current
(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
4
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31DQ03, 31DQ04
Bulletin PD-2.304 rev. E 03/03
Ordering Information Table
Device Code
31
1
D
2
Q
3
04
4
TR
5
1
2
3
4
5
-
-
-
-
-
31 = 3.1A (Axial and small packages - Current is x10)
D = DO-41 package
Q = Schottky Q.. Series
04 = Voltage Ratings
TR = Tape & Reel package (1200 pcs)
-
= Box package (500 pcs)
04 = 40V
03 = 30V
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.
IR WORLD HEADQUARTERS:
233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7309
Visit us at www.irf.com for sales contact information. 03/03
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