Dimensions in millimeters and inches
Outline C - 16
CASE STYLE AND DIMENSIONS
IF(AV) Rectangular 3.3 A
waveform
VRRM 90/100 V
IFSM @ tp = 5 µs sine 210 A
VF@
3 Apk, TJ
= 25°C 0.85 V
TJ- 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, 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
Description/FeaturesMajor Ratings and Characteristics
SCHOTTKY RECTIFIER 3.3 Amp
31DQ09
31DQ10
Bulletin PD-2.306 rev. C 05/01
1
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31DQ09, 31DQ10
Bulletin PD-2.306 rev. C 05/01
2www.irf.com
Part number 31DQ09 31DQ10
VRMax. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V)
Voltage Ratings
90 100
IF(AV) Max. Average Forward Current 3.3 A 50% duty cycle @ TL = 53.4°C, rectangular wave form
* See Fig. 4 With cooling fins
IFSM Max. Peak One Cycle Non-Repetitive 210 5µs Sine or 3µs Rect. pulse
Surge Current * See Fig. 6 35 10ms Sine or 6ms Rect. pulse
Absolute Maximum Ratings
Parameters 31DQ.. Units Conditions
AFollowing any rated
load condition and with
rated VRRM
applied
VFM Max. Forward Voltage Drop 0.85 V @ 3A
* See Fig. 1 (1) 0.97 V @ 6A
0.69 V @ 3A
0.80 V @ 6A
IRM Max. Reverse Leakage Current 1 mA TJ = 25 °C
* See Fig. 2 (1) 3 mA TJ = 125 °C
CTTypical Junction Capacitance 110 pF VR = 5VDC (test signal range 100Khz to 1Mhz) 25°C
LSTypical Series Inductance 9.0 nH Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change 10000 V/µs
(Rated VR)
TJ = 25 °C
TJ = 125 °C
VR = rated VR
Parameters 31DQ.. Units Conditions
Electrical Specifications
(1) Pulse Width < 300µs, Duty Cycle <2%
TJMax. Junction Temperature Range -40 to 150 °C
Tstg Max. Storage Temperature Range -40 to 150 °C
RthJA Max. Thermal Resistance Junction 80 °C/W DC operation
to Ambient Without cooling fins
RthJL Typical Thermal Resistance Junction 34 °C/W DC operation
to Lead
wt Approximate Weight 1.2 (0.042) g (oz.)
Case Style C - 16
Thermal-Mechanical Specifications
Parameters 31DQ.. Units Conditions
31DQ09, 31DQ10
Bulletin PD-2.306 rev. C 05/01
3
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Fig. 1 - Max. Forward Voltage Drop Characteristics
Forward Voltage Drop - VFM (V)
Instantaneous Forward Current - IF (A)
Reverse Voltage - VR (V)
Reverse Voltage - VR (V)
Junction Capacitance - CT (pF)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage
Reverse Current - IR (mA)
0
.1
1
10
0 0.3 0.6 0.9 1.2
T = 150˚C
T = 125˚C
T = 25˚C
J
J
J
0
0.0001
0.001
0.01
0.1
1
10
0 20406080100
125˚C
25˚C
T = 150˚C
J
10
100
1000
0 40 80 120 160
T = 25˚C
J
31DQ09, 31DQ10
Bulletin PD-2.306 rev. C 05/01
4www.irf.com
Average Forward Current - IF(AV)
(A)
Square Wave Pulse Duration - tp (microsec)
Fig. 6 - Max. Non-Repetitive Surge Current
Allowable Lead Temperature (°C)
Non-Repetitive Surge Current - I FSM (A)
Fig. 5- Forward Power Loss Characteristics
Average Forward Current - IF(AV) (A)
Average Power Loss (Watts)
(2) Formula used: TC = TJ - (Pd + PdREV) x RthJC ;
Pd = Forward Power Loss = IF(AV) x VFM @ (IF(AV) / D) (see Fig. 6);
PdREV = Inverse Power Loss = VR1 x IR (1 - D); IR @ VR1 = 80% rated VR
Fig. 4 - Max. Allowable Lead Temperature
Vs. Average Forward Current
0
30
60
90
120
150
012345
DC
see note (2)
Square wave (D = 0.50)
80% Rated V applied
R
0
1
2
3
4
012345
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
31DQ09, 31DQ10
Bulletin PD-2.306 rev. C 05/01
5
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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. 05/01
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
15
24
3
1- 31 = 3.3A (Axial and small packages - Current is x10)
2- D = DO-41 package
3- Q = Schottky Q.. Series
4- 10 = Voltage Ratings
5- TR = Tape & Reel package ( 5000 pcs)
TB = Tape & Box package (Ammunition -3000 pcs)
- = Box package (1000 pcs)
31 D Q 10 TR
10 = 100V
09 = 90V
