Bulletin PD-21029 rev. A 06/06
20CTQ...SPbF
20CTQ... -1PbF
SCHOTTKY RECTIFIER
20 Amp
I
F(AV)
= 20Amp
V
R
= 35/ 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
Lead-Free ("PbF" suffix)
Values
20
35 / 45
1060
0.57
V
A
V
- 55 to 175
°C
Case Styles
20CTQ...SPbF
20CTQ...-1PbF
Base
Common
Cathode
2
Base
Common
Cathode
2
1
Anode
2
Common
Cathode
3
1
Anode
Anode
2
Common
Cathode
3
Anode
D
2
PAK
Document Number: 94163
TO-262
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1
20CTQ...SPbF, 20CTQ...-1PbF Series
Bulletin PD-21029 rev. A 06/06
Voltage Ratings
Part number
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
20CTQ035SPbF
20CTQ035-1PbF
35
20CTQ040SPbF
20CTQ040-1PbF
40
20CTQ045SPbF
20CTQ045-1PbF
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
A
mJ
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
Marking Device
°C/W DC operation
°C/W DC operation
* See Fig. 4
°C/W Mounting surface , smooth and greased
g (oz.)
Kg-cm
(Ibf-in)
Case style D
2
Pak
Case style TO-262
20CTQ...S
20CTQ...-1
Document Number: 94163
www.vishay.com
2
20CTQ...SPbF, 20CTQ...-1PbF Series
Bulletin PD-21029 rev. A 06/06
10
00
10
00
10
0
R v rs C rre t - I (m )
ee e u n
A
R
1
0
1
.1
.0
1
.0 1
0
.0 0
01
0
T =1 5 C
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 )
1
0
T =1 5 C
7°
J
T =1 5 C
2°
J
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
R v rs V lta e- V (V
ee e o g
)
R
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)
1
P
M
D
.1
t
1
t
2
N te :
o s
1 D tyfa to D= t / t
. u
c r
1 2
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
eo d)
1
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
Document Number: 94163
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3
20CTQ...SPbF, 20CTQ...-1PbF Series
Bulletin PD-21029 rev. A 06/06
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 5 C
.2 ° /W
th C C
9
D=0 8
.0
8 D=0 7
.1
D=0 5
.2
7
D=0 3
.3
.5
6 D=0 0
5
4 R SL it
M im
3
2
1
5
1
0
1
5
0
0
5
1
0
1
5
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
HIGH-S
PEED
S CH
WIT
FR
EE-WHEEL
DIODE
40HF
L40S
02
+
DUT
IR P460
F
Rg = 25 ohm
Vd = 25 Volt
CURRENT
MONIT
OR
Fig. 8 - Unclamped Inductive Test Circuit
Document Number: 94163
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4
20CTQ...SPbF, 20CTQ...-1PbF Series
Bulletin PD-21029 rev. A 06/06
Outlines Table
Conform to JEDEC outline D
2
Pak (SMD-220)
Dimensions in millimeters and (inches)
Modified JEDEC outline TO-262
Dimensions in millimeters and (inches)
Document Number: 94163
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