Bulletin PD-20056 rev.
A
12/01
20CTQ...
20CTQ...S
20CTQ... -1
SCHOTTKY RECTIFIER
20 Amp
I
F(AV)
= 20Amp
V
R
= 35 to 45V
Major Ratings and Characteristics
Characteristics
I
F(AV)
Rectangular
waveform
V
RRM
range
I
FSM
@ tp = 5 µs sine
V
F
T
J
@ 10 Apk, T
J
= 125°C
(per leg)
range
Description/Features
Units
A
The 20CTQ center tap Schottky rectifier 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 TO-220 package
Low forward voltage drop
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
20CTQ
20
35 to 45
1060
0.57
V
A
V
- 55 to 175
°C
Case Styles
20CTQ...
20CTQ... S
20CTQ... -1
Base
Common
Cathode
2
Base
Common
Cathode
2
Base
Common
Cathode
2
1
Anode
2
Common
Cathode
3
1
Anode
Anode
2
Common
Cathode
3
1
Anode
Anode
2
Common
Cathode
3
Anode
TO-220
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D
2
PAK
TO-262
1
20CTQ... Series
Bulletin PD-20056 rev. A 12/01
Voltage Ratings
Part number
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
20CTQ035
35
20CTQ040
40
20CTQ045
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)
1060
265
13
2.0
mJ
A
A
5µs Sine or 3µs Rect. pulse
Following any rated
load condition and with
10ms Sine or 6ms Rect. pulse rated V
RRM
applied
20CTQ Units
20
A
Conditions
50% duty cycle @ T
C
= 145°C, rectangular wave form
T
J
= 25 °C, I
AS
= 2.0 Amps, L = 6.5 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
(Per Leg) * See Fig. 1
(1)
20CTQ Units
0.64
0.76
0.57
0.68
2
15
900
8.0
10000
V
V
V
V
mA
mA
pF
nH
V/ µs
@ 10A
@ 20A
@ 10A
@ 20A
T
J
= 25 °C
T
J
= 125 °C
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
(1)
Max. Junction Capacitance (Per Leg)
Typical Series Inductance (Per Leg)
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
)
Thermal-Mechanical Specifications
Parameters
T
J
T
stg
Max. Junction Temperature Range
Max. Storage Temperature Range
(1) Pulse Width < 300µs, Duty Cycle <2%
20CTQ Units
-55 to 175
-55 to 175
3.25
1.63
0.50
2 (0.07)
Min.
Max.
6 (5)
12 (10)
°C
°C
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
wt
T
Approximate Weight
Mounting Torque
°C/W DC operation
°C/W DC operation
* See Fig. 4
°C/W Mounting surface , smooth and greased
g (oz.)
Kg-cm
(Ibf-in)
2
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20CTQ... Series
Bulletin PD-20056 rev. A 12/01
10
00
10
00
10
0
R v rs C rre t - I ( A
ee e u n
m)
R
1
0
1
.1
.0
1
.0 1
0
.0 0
01
0
1
0
T =1 5 C
7°
J
T =1 5 C
2°
J
T =1 5C
7°
J
1 0C
5°
1 5C
2°
1 0C
0°
7°
5C
5°
0C
2°
5C
10
0
In ta ta e u F rw rdC rre t - I (A
s n nos o a
u n
)
F
5
1 1 2 2 3 3 4 4
0 5 0 5 0 5 0 5
R v rs V lta e- V (V
ee e o g
R )
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
10
00
J n tio C p c n e - C (p )
u c n a a ita c
F
T
T= 2 °
5C
J
1
T =2 °
5C
J
.1
0
.2
.4
.6
.8
1
1
.2
1
.4
1
.6 1
.8
10
0
0
1
0
2
0
3
0
4
0
5
0
F rw rdV lta eD p- V (V
o a
o g ro
)
F
M
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
1
0
T e a Im e a c - Zth C(° /W
h rm l p d n e
C )
J
D=0 0
.5
D=0 3
.3
D=0 5
.2
D=0 7
.1
D=0 8
.0
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
R v rs V lta e- V (V
ee e o g
)
R
1
P
M
D
.1
t
1
t2
N te :
o s
1 D tyfa to D= t1/ t2
. u
c r
S g P ls
in le u e
(T e a R s ta c )
h rm l e is n e
2 P a T =P xZ
. ek
+T
J D
M th C C
J
.0
1
.1
1
1
0
10
0
.0
1
.0 1
0
.0 0 1
00
.0 0
01
.0 1
0
t , R c n u r P ls D ra n(S c n s
e ta g la u e u tio
eod)
1
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
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3
20CTQ... Series
Bulletin PD-20056 rev. A 12/01
10
8
A w b C s T m e tu - (° )
llo a le a e e p ra re C
15
7
10
7
15
6
10
6
15
5
10
5
15
4
0
D
C
2CQ
0 T
R J (D ) =3 5C
.2 ° /W
th C C
9
D=0 8
.0
8 D=0 7
.1
D=0 5
.2
7
D=0 3
.3
D=0 0
.5
6
5
4 R SL it
M im
3
2
1
5
1
0
1
5
0
0
5
1
0
5
1
D
C
A e g P w r L s - (W tts
v ra e o e o s
a )
A e g F rw rdC rre t - IF V (A
v ra e o a
u n
(A ) )
A e g F rw rdC rre t - I
v ra e o a
u n
(A
)
F V
(A )
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
1000
FSM
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
Non-Repetitive Surge Current - I
(A)
At Any Rated Load Condition
And With Rated V
RRM
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
FRE E-W H EEL
D IO D E
40H FL40 S02
V d = 25 V olt
D UT
IRFP460
R g = 25 oh m
+
C URRE NT
M O N ITO R
Fig. 8 - Unclamped Inductive Test Circuit
4
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20CTQ... Series
Bulletin PD-20056 rev. A 12/01
Outline Table
10.54 (0.41)
MAX.
3.78 (0.15)
3.54 (0.14)
15.24 (0.60)
14.84 (0.58)
1 2 3
14.09 (0.55)
13.47 (0.53)
3.96 (0.16)
3.55 (0.14)
2.04 (0.080) MAX.
1.40 (0.05)
1.15 (0.04)
0.94 (0.04)
0.69 (0.03)
1
2
3
1.32 (0.05)
DIA.
6.48 (0.25)
6.23 (0.24)
2°
1.22 (0.05)
2.92 (0.11)
2.54 (0.10)
TERM 2
0.10 (0.004)
2.89 (0.11)
2.64 (0.10)
BASE
COMMON
CATHODE
2
1 2 3
4.57 (0.18)
4.32 (0.17)
0.61 (0.02) MAX.
ANODE COMMON ANODE
CATHODE
1
2
5.08 (0.20) REF.
Conform to JEDEC outline TO-220AB
Dimensions in millimeters and (inches)
10.16 (0.40)
REF.
4.69 (0.18)
4.20 (0.16)
1.32 (0.05)
6.47 (0.25)
15.49 (0.61)
1.22 (0.05)
93°
6.18 (0.24)
14.73 (0.58)
2.61 (0.10)
2.32 (0.09)
8.89 (0.35)
5.28 (0.21)
4.78 (0.19)
0.55 (0.02)
0.46 (0.02)
3X
BASE
COMMON
CATHODE
2
1.40 (0.055)
REF.
0.93 (0.37)
0.69 (0.27)
1.14 (0.045)
2X
MINIMUM RECOMMENDED FOOTPRINT
11.43 (0.45)
1
1
2
3
ANODE COMMON ANODE
CATHODE
1
2
3
4.57 (0.18)
4.32 (0.17)
2
0.61 (0.02) MAX.
5.08 (0.20) REF.
8.89 (0.35)
17.78 (0.70)
3.81 (0.15)
2.08 (0.08)
Conform to JEDEC outline D
2
Pak (SMD-220)
Dimensions in millimeters and (inches)
2X
2.54 (0.10)
2X
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