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81CNQ...A Series  
Vishay High Power Products  
Schottky Rectifier  
New Generation 3 D-61 Package, 2 x 40 A  
FEATURES  
81CNQ...A  
Base  
common  
• 175 °C TJ operation  
cathode  
• Center tap module  
• Low forward voltage drop  
1
2
3
Anode  
2
• High frequency operation  
Anode  
1
Common  
cathode  
D-61-8  
81CNQ...ASM  
• High purity, high temperature epoxy encapsulation for  
enhanced mechanical strength and moisture resistance  
• Guard ring for enhanced ruggedness and long term  
reliability  
• New fully transfer-mold low profile, small footprint, high  
current package  
1
2
3
Anode  
2
Anode  
1
Common  
cathode  
• Designed and qualified for industrial level  
D-61-8-SM  
81CNQ...ASL  
DESCRIPTION  
Base  
common  
cathode  
The 81CNQ...A center tap Schottky rectifier module series  
has been optimized for low reverse leakage at high  
temperature. The proprietary barrier technology allows for  
reliable operation up to 175 °C junction temperature. Typical  
applications are in switching power supplies, converters,  
freewheeling diodes, and reverse battery protection.  
1
3
Anode  
2
Anode  
1
D-61-8-SL  
PRODUCT SUMMARY  
IF(AV)  
2 x 40 A  
VR  
35 to 45 V  
MAJOR RATINGS AND CHARACTERISTICS  
SYMBOL  
IF(AV)  
VRRM  
IFSM  
CHARACTERISTICS  
VALUES  
80  
UNITS  
Rectangular waveform  
A
V
35 to 45  
4600  
tp = 5 µs sine  
A
VF  
40 Apk, TJ = 125 °C (per leg)  
Range  
0.54  
V
TJ  
- 55 to 175  
°C  
VOLTAGE RATINGS  
PARAMETER  
SYMBOL  
81CNQ035A  
81CNQ040A  
40  
81CNQ045A  
UNITS  
Maximum DC reverse voltage  
VR  
35  
45  
V
Maximum working peak reverse voltage  
VRWM  
Document Number: 93400  
Revision: 19-Aug-08  
For technical questions, contact: diodes-tech@vishay.com  
www.vishay.com  
1
81CNQ...A Series  
Schottky Rectifier  
New Generation 3  
Vishay High Power Products  
D-61 Package, 2 x 40 A  
ABSOLUTE MAXIMUM RATINGS  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
50 % duty cycle at TC = 141 °C, rectangular waveform  
VALUES  
UNITS  
Maximum average forward current  
See fig. 5  
IF(AV)  
80  
A
Maximum peak one cycle  
non-repetitive surge current per leg  
See fig. 7  
Following any rated  
load condition and with  
rated VRRM applied  
5 µs sine or 3 µs rect. pulse  
4600  
IFSM  
10 ms sine or 6 ms rect. pulse  
TJ = 25 °C, IAS = 8 A, L = 1.7 mH  
790  
54  
Non-repetitive avalanche energy per leg  
Repetitive avalanche current per leg  
EAS  
IAR  
mJ  
A
Current decaying linearly to zero in 1 µs  
Frequency limited by TJ maximum VA = 1.5 x VR typical  
8
ELECTRICAL SPECIFICATIONS  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
VALUES  
0.60  
0.74  
0.54  
0.66  
5
UNITS  
40 A  
TJ = 25 °C  
Maximum forward  
voltage drop per leg  
See fig. 1  
80 A  
(1)  
VFM  
V
40 A  
TJ = 125 °C  
80 A  
Maximum reverse  
leakage current per leg  
See fig. 2  
TJ = 25 °C  
(1)  
IRM  
VR = Rated VR  
mA  
TJ = 125 °C  
45  
Maximum junction capacitance per leg  
Typical series inductance per leg  
Maximum voltage rate of change  
CT  
LS  
VR = 5 VDC (test signal range 100 kHz to 1 MHz) 25 °C  
Measured lead to lead 5 mm from package body  
Rated VR  
2600  
5.5  
pF  
nH  
dV/dt  
10 000  
V/µs  
Note  
(1)  
Pulse width < 300 µs, duty cycle < 2 %  
www.vishay.com  
2
For technical questions, contact: diodes-tech@vishay.com  
Document Number: 93400  
Revision: 19-Aug-08  
81CNQ...A Series  
Schottky Rectifier  
New Generation 3  
Vishay High Power Products  
D-61 Package, 2 x 40 A  
THERMAL - MECHANICAL SPECIFICATIONS  
PARAMETER  
SYMBOL  
TEST CONDITIONS  
VALUES  
UNITS  
Maximum junction and storage  
temperature range  
TJ, TStg  
- 55 to 175  
°C  
Maximum thermal resistance,  
junction to case per leg  
DC operation  
See fig. 4  
0.85  
0.42  
0.30  
RthJC  
Maximum thermal resistance,  
junction to case per package  
DC operation  
°C/W  
Typical thermal resistance,  
case to heatsink (D-61-8 only)  
Mounting surface, smooth and greased  
Device flatness < 5 mils  
RthCS  
7.8  
g
Approximate weight  
0.28  
oz.  
minimum  
maximum  
40 (35)  
58 (50)  
kgf · cm  
(lbf · in)  
Mounting torque  
(D-61-8 only)  
81CNQ035A  
Case style D-61-8  
81CNQ040A  
81CNQ045A  
81CNQ035ASM  
81CNQ040ASM  
81CNQ045ASM  
81CNQ035ASL  
81CNQ040ASL  
81CNQ045ASL  
Marking device  
Case style D-61-8-SM  
Case style D-61-8-SL  
Document Number: 93400  
Revision: 19-Aug-08  
For technical questions, contact: diodes-tech@vishay.com  
www.vishay.com  
3
81CNQ...A Series  
Schottky Rectifier  
New Generation 3  
Vishay High Power Products  
D-61 Package, 2 x 40 A  
1000  
100  
10  
1000  
100  
10  
Tj = 175°C  
150°C  
125°C  
100°C  
75°C  
1
0.1  
50°C  
25°C  
0.01  
0.001  
0
5
10 15 20 25 30 35 40 45  
ReverseVoltage-VR(V)  
Fig. 2 - Typical Values of Reverse Current vs.  
Reverse Voltage (Per Leg)  
T
T
T
= 175°C  
J
J
J
10000  
= 125°C  
25°C  
=
T
= 25°C  
J
1
1000  
100  
0.1  
0
0.2  
0.4  
0.6  
0.8  
1
0
10  
20  
30  
40  
50  
ForwardVoltageDrop-VFM(V)  
ReverseVoltage-VR(V)  
Fig. 1 - Maximum Forward Voltage Drop Characteristics  
(Per Leg)  
Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage  
(Per Leg)  
1
D = 0.50  
D = 0.33  
D = 0.25  
D = 0.17  
P
DM  
D = 0.08  
0.1  
t
1
t
2
Notes:  
Single Pulse  
(Thermal Resistance)  
1. Duty factor D = t1/ t2  
2. Peak Tj = Pdm x ZthJC + Tc  
0.01  
0.00001  
0.0001  
0.001  
0.01  
0.1  
1
10  
100  
t1,RectangularPulseDuration(Seconds)  
Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics (Per Leg)  
www.vishay.com  
4
For technical questions, contact: diodes-tech@vishay.com  
Document Number: 93400  
Revision: 19-Aug-08  
81CNQ...A Series  
Schottky Rectifier  
New Generation 3  
Vishay High Power Products  
D-61 Package, 2 x 40 A  
180  
170  
160  
150  
140  
32  
D = 0.08  
D = 0.17  
D = 0.25  
D = 0.33  
D = 0.50  
RthJC (DC) = 0.85 °C/W  
28  
24  
20  
16  
12  
8
DC  
40  
RMS Limit  
DC  
4
0
0
10  
20  
30  
40  
50  
60  
0
10  
20  
30  
50  
60  
AverageForwardCurrent-IF(AV)(A)  
AverageForwardCurrent-IF(AV)(A)  
Fig. 5 - Maximum Allowable Case Temperature vs.  
Average Forward Current (Per Leg)  
Fig. 6 - Forward Power Loss Characteristics (Per Leg)  
10000  
1000  
At Any Rated Load Condition  
And With Rated Vrrm Applied  
Following Surge  
100  
10  
100  
1000  
10000  
SquareWavePulseDuration-tp(microsec)  
Fig. 7 - Maximum Non-Repetitive Surge Current (Per Leg)  
L
High-speed  
switch  
IRFP460  
D.U.T.  
Freewheel  
diode  
Rg = 25 Ω  
Vd = 25 V  
+
Current  
monitor  
40HFL40S02  
Fig. 8 - Unclamped Inductive Test Circuit  
Document Number: 93400  
Revision: 19-Aug-08  
For technical questions, contact: diodes-tech@vishay.com  
www.vishay.com  
5
81CNQ...A Series  
Schottky Rectifier  
New Generation 3  
Vishay High Power Products  
D-61 Package, 2 x 40 A  
ORDERING INFORMATION TABLE  
Device code  
81  
C
N
Q
045  
A
-
1
2
3
4
5
6
7
1
2
-
-
Current rating (80 A)  
Circuit configuration:  
C = Common cathode  
Package:  
3
-
N = D-61  
-
-
-
Schottky “Q” series  
Voltage ratings  
Package style:  
4
5
6
035 = 35 V  
040 = 40 V  
045 = 45 V  
A = D-61-8  
ASM = D-61-8-SM  
ASL = D-61-8-SL  
-
None = Standard production  
7
PbF = Lead (Pb)-free (D-61-8 only)  
Standard pack quantity: A = 10 pieces; ASM/ASL = 20 pieces  
LINKS TO RELATED DOCUMENTS  
Dimensions  
http://www.vishay.com/doc?95354  
http://www.vishay.com/doc?95356  
Part marking information  
www.vishay.com  
6
For technical questions, contact: diodes-tech@vishay.com  
Document Number: 93400  
Revision: 19-Aug-08  
Legal Disclaimer Notice  
Vishay  
Disclaimer  
All product specifications and data are subject to change without notice.  
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf  
(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein  
or in any other disclosure relating to any product.  
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any  
information provided herein to the maximum extent permitted by law. The product specifications do not expand or  
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed  
therein, which apply to these products.  
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this  
document or by any conduct of Vishay.  
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless  
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such  
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting  
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding  
products designed for such applications.  
Product names and markings noted herein may be trademarks of their respective owners.  
Document Number: 91000  
Revision: 18-Jul-08  
www.vishay.com  
1