80 Amp
81CNQ...A SERIES
Bulletin PD-20040 rev. A 09/01
www.irf.com
1
I
F(AV)
Rectangular
80
A
waveform
V
RRM
range
35 to 45
V
I
FSM
@ tp = 5 s sine
4600
A
V
F
@
40 Apk, T
J
= 125C
0.54
V
(per leg)
T
J
range
- 55 to 175
C
Characteristics
81CNQ...A Units
Major Ratings and Characteristics
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, free-wheeling diodes,
and reverse battery protection.
175 C T
J
operation
Center tap module
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
New fully transfer-mold low profile, small
footprint, high current package
Description/Features
SCHOTTKY RECTIFIER
New GenIII D-61 Package
Case Styles
D61-8
81CNQ...A
81CNQ...ASM
81CNQ...ASL
D61-8-SM
D61-8-SL
81CNQ...A Series
2
Bulletin 20040 rev. A 09/01
www.irf.com
I
F(AV)
Max. Average Forward Current
80
A
50% duty cycle @ T
C
= 141 C, rectangular wave form
* See Fig. 5
I
FSM
Max. Peak One Cycle Non-Repetitive
4600
5s Sine or 3s Rect. pulse
Surge Current (Per Leg) * See Fig. 7
790
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
54
mJ
T
J
= 25 C, I
AS
= 8 Amps, L = 1.7 mH
(Per Leg)
I
AR
Repetitive Avalanche Current
8
A
Current decaying linearly to zero in 1 sec
(Per Leg)
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
T
J
Max. Junction Temperature Range
-55 to 175
C
T
stg
Max. Storage Temperature Range
-55 to 175
C
R
thJC
Max. Thermal Resistance Junction
0.85
C/W DC operation
* See Fig. 4
to Case (Per Leg)
R
thJC
Max. Thermal Resistance Junction
0.42
C/W DC operation
to Case (Per Package)
R
thCS
Typical Thermal Resistance, Case
0.30
C/W Mounting surface , smooth and greased
to Heatsink (D61-8 Only)
Device flatness < 5 mils
wt
Approximate Weight
7.8 (0.28)
g (oz.)
T
Mounting Torque
Min.
40 (35)
(D61-8 Only)
Max.
58 (50)
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
V
FM
Max. Forward Voltage Drop
0.60
V
@ 40A
(Per Leg) * See Fig. 1
(1)
0.74
V
@ 80A
0.54
V
@ 40A
0.66
V
@ 80A
I
RM
Max. Reverse Leakage Current
5
mA
T
J
= 25 C
(Per Leg) * See Fig. 2
(1)
45
mA
T
J
= 125 C
C
T
Max. Junction Capacitance (Per Leg)
2600
pF
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance (Per Leg)
5.5
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
Electrical Specifications
(1) Pulse Width < 300s, Duty Cycle <2%
V
R
= rated V
R
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
Parameters
81CNQ Units
Conditions
A
Part number
81CNQ035A
81CNQ040A
81CNQ045A
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
Voltage Ratings
35
40
45
Parameters
81CNQ Units
Conditions
Parameters
81CNQ Units
Conditions
81CNQ...A Series
3
Bulletin 20040 rev. A 09/01
www.irf.com
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
Instantaneous Forward Current - I
F
(A)
Forward Voltage Drop - V
FM
(V)
Reverse Current - I
R
(mA)
Reverse Voltage - V
R
(V)
Junction Capacitance - C
T
(p F)
Reverse Voltage - V
R
(V)
t
1
, Rectangular Pulse Duration (Seconds)
Thermal Impedance Z
thJC
(C/W)
0.01
0.1
1
0.00001
0.0001
0.001
0.01
0.1
1
10
100
Single Pulse
(Thermal Resistance)
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
Notes:
1. Duty factor D = t1/ t2
2. Peak Tj = Pdm x ZthJC + Tc
2
t
1
t
P
DM
0.1
1
10
100
1000
0
0.2
0.4
0.6
0.8
1
T = 175C
T = 125C
T = 25C
J
J
J
0.001
0.01
0.1
1
10
100
1000
0
5
10 15 20 25 30 35 40 45
150C
125C
100C
75C
50C
25C
Tj = 175C
100
1000
10000
0
10
20
30
40
50
T = 25C
J
81CNQ...A Series
4
Bulletin 20040 rev. A 09/01
www.irf.com
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
Allowable Case Temperature (C)
Average Forward Current - I
F(AV)
(A)
Average Power Loss (Watts)
Average Forward Current - I
F(AV)
(A)
Non-Repetitive Surge Current - I
FSM
(A)
Square Wave Pulse Duration - t
p
(microsec)
FR EE-W H E EL
D IO D E
40H FL40 S02
C U R RE N T
M O N ITO R
H IG H-SP E ED
SW ITC H
IRFP460
L
D U T
R g = 25 ohm
V d = 25 V o lt
+
0
4
8
12
16
20
24
28
32
0
10
20
30
40
50
60
DC
RMS Limit
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
100
1000
10000
10
100
1000
10000
At Any Rated Load Condition
And With Rated Vrrm Applied
Following Surge
140
150
160
170
180
0
10
20
30
40
50
60
DC
RthJC (DC) = 0.85 C/W
81CNQ...A Series
5
Bulletin 20040 rev. A 09/01
www.irf.com
Outline Table
Outline D61-8
Dimensions are in millimeters and (inches)
Outline D61-8-SM
Dimensions are in millimeters and (inches)
81CNQ...A Series
6
Bulletin 20040 rev. A 09/01
www.irf.com
Outline Table
Outline D61-8-SL
Dimensions are in millimeters and (inches)
81CNQ...A Series
7
Bulletin 20040 rev. A 09/01
www.irf.com
Part Marking Information
D61-8
D61-8-SM
D61-8-SL
THIS IS A 81CNQ045ASL WITH
LOT CODE 89 09
ASSEMBLED ON WW 45, 2000
IN THE ASSEMBLY LINE "A"
ASSEMBLY
LOT CODE
INTERNATIONAL
RECTIFIER
LOGO
PART NUMBER
DATE CODE
YEAR 0 = 2000
WEEK 45
LINE A
81CNQ045ASL
89 09 045A
THIS IS A 81CNQ045A WITH
LOT CODE 89 09
ASSEMBLED ON WW 45, 2000
IN THE ASSEMBLY LINE "A"
ASSEMBLY
LOT CODE
INTERNATIONAL
RECTIFIER
LOGO
PART NUMBER
DATE CODE
YEAR 0 = 2000
WEEK 45
LINE A
81CNQ045A
89 09 045A
THIS IS A 81CNQ045ASM WITH
LOT CODE 89 09
ASSEMBLED ON WW 45, 2000
IN THE ASSEMBLY LINE "A"
ASSEMBLY
LOT CODE
INTERNATIONAL
RECTIFIER
LOGO
PART NUMBER
DATE CODE
YEAR 0 = 2000
WEEK 45
LINE A
81CNQ045ASM
89 09 045A
81CNQ...A Series
8
Bulletin 20040 rev. A 09/01
www.irf.com
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. 09/01
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.
PDF 
ZIP