Bulletin PD-20040 rev. A 09/01
81CNQ...A SERIES
SCHOTTKY RECTIFIER
New GenIII D-61 Package
Major Ratings and Characteristics
Characteristics
I
F(AV)
Rectangular
waveform
V
RRM
range
I
FSM
@ tp = 5 µs sine
V
F
T
J
@ 40 Apk, T
J
= 125°C
(per leg)
range
80 Amp
Description/Features
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.
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
175 °C T
J
operation
81CNQ...A Units
80
35 to 45
4600
0.54
A
V
A
V
- 55 to 175
°C
New fully transfer-mold low profile, small
footprint, high current package
Case Styles
81CNQ...A
81CNQ...ASM
81CNQ...ASL
D61-8
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D61-8-SM
D61-8-SL
1
81CNQ...A Series
Bulletin 20040 rev. A 09/01
Voltage Ratings
Part number
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
81CNQ035A
35
81CNQ040A
40
81CNQ045A
45
Absolute Maximum Ratings
Parameters
I
F(AV)
Max. Average Forward Current
* See Fig. 5
I
FSM
E
AS
I
AR
Max. Peak One Cycle Non-Repetitive
Surge Current (Per Leg) * See Fig. 7
Non-Repetitive Avalanche Energy
(Per Leg)
Repetitive Avalanche Current
(Per Leg)
4600
790
54
8
A
mJ
A
Following any rated
load condition and with
10ms Sine or 6ms Rect. pulse rated V
RRM
applied
5µs Sine or 3µs Rect. pulse
T
J
= 25 °C, I
AS
= 8 Amps, L = 1.7 mH
Current decaying linearly to zero in 1 µsec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
81CNQ Units
80
A
Conditions
50% duty cycle @ T
C
= 141 °C, rectangular wave form
Electrical Specifications
Parameters
V
FM
Max. Forward Voltage Drop
(Per Leg) * See Fig. 1
(1)
81CNQ Units
0.60
0.74
0.54
0.66
5
45
2600
5.5
10000
V
V
V
V
mA
mA
pF
nH
V/ µs
@ 40A
@ 80A
@ 40A
@ 80A
Conditions
T
J
= 25 °C
T
J
= 125 °C
V
R
= rated V
R
I
RM
C
T
L
S
Max. Reverse Leakage Current
(Per Leg) * See Fig. 2
Typical Series Inductance
(1)
(Per Leg)
Max. Junction Capacitance (Per Leg)
T
J
= 25 °C
T
J
= 125 °C
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25°C
Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change
(Rated V
R
)
(1) Pulse Width < 300µs, Duty Cycle <2%
Thermal-Mechanical Specifications
Parameters
T
J
T
stg
Max. Junction Temperature Range
Max. Storage Temperature Range
81CNQ Units
-55 to 175
-55 to 175
0.85
0.42
0.30
7.8 (0.28)
Min.
Max.
40 (35)
58 (50)
°C
°C
°C/W
°C/W
°C/W
g (oz.)
Kg-cm
(Ibf-in)
Conditions
R
thJC
Max. Thermal Resistance Junction
to Case (Per Leg)
R
thJC
Max. Thermal Resistance Junction
to Case (Per Package)
R
thCS
Typical Thermal Resistance, Case
to Heatsink
(D61-8 Only)
wt
T
Approximate Weight
MountingTorque
(D61-8 Only)
DCoperation
DCoperation
* See Fig. 4
Mounting surface , smooth and greased
Device flatness < 5 mils
2
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81CNQ...A Series
Bulletin 20040 rev. A 09/01
1000
1000
Tj = 175˚C
100
Reverse Current - I
R
(mA)
150˚C
10
1
0.1
0.01
0.001
0
5
125˚C
100˚C
75˚C
50˚C
25˚C
100
Instantaneous Forward Current - I
F
(A)
10 15 20 25 30 35 40 45
Reverse Voltage - V
R
(V)
10
T = 175˚C
J
Junction Capacitance - C
T
(p F)
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
10000
T = 125˚C
J
T = 25˚C
J
T J = 25˚C
1
1000
0.1
0
0.2
0.4
0.6
0.8
1
Forward Voltage Drop - V
FM
(V)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
100
0
10
20
30
40
50
Reverse Voltage - V
R
(V)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
1
Thermal Impedance Z
thJC
(°C/W)
D = 0.50
D = 0.33
D = 0.25
D = 0.17
0.1
D = 0.08
P
DM
t1
t2
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
t
1
, Rectangular Pulse Duration (Seconds)
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
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3
81CNQ...A Series
Bulletin 20040 rev. A 09/01
180
Allowable Case Temperature (°C)
32
RthJC (DC) = 0.85 ˚C/W
Average Power Loss (Watts)
170
D = 0.08
28
D = 0.17
D = 0.25
24
D = 0.33
D = 0.50
20
160
DC
16
RMS Limit
12
8
4
DC
150
140
0
10
20
30
40
50
60
Average Forward Current - I
F(AV)
(A)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
0
0
10
20
30
40
50
60
Average Forward Current - I
F(AV)
(A)
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
10000
Non-Repetitive Surge Current - I
FSM
(A)
1000
At Any Rated Load Condition
And With Rated Vrrm Applied
Following Surge
100
10
100
1000
10000
Square Wave Pulse Duration - t
p
(microsec)
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
L
H IG H-SPE ED
SW ITC H
FR EE-W H E EL
D IO D E
40H FL40 S02
V d = 25 V olt
D UT
IRFP460
Rg = 25 ohm
+
C URRE NT
M O N ITO R
Fig. 8 - Unclamped Inductive Test Circuit
4
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81CNQ...A Series
Bulletin 20040 rev. A 09/01
Outline Table
Outline D61-8
Dimensions are in millimeters and (inches)
Outline D61-8-SM
Dimensions are in millimeters and (inches)
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