20CTQ...PbF Series
Vishay High Power Products
Schottky Rectifier, 20 A
®
FEATURES
• 175 °C T
J
operation
Base 2
common
cathode
• Center tap TO-220 package
• Low forward voltage drop
• High frequency operation
Pb-free
Available
RoHS*
COMPLIANT
• High purity, high temperature epoxy
encapsulation for enhanced mechanical strength and
moisture resistance
Anode
TO-220AB
Anode
2
1 Common 3
cathode
• Guard ring for enhanced ruggedness and long term
reliability
• Lead (Pb)-free (“PbF” suffix)
• Designed and qualified for industrial level
DESCRIPTION
PRODUCT SUMMARY
I
F(AV)
V
R
20 A
35 to 45 V
The 20CTQ...PbF 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,
freewheeling diodes, and reverse battery protection.
MAJOR RATINGS AND CHARACTERISTICS
SYMBOL
I
F(AV)
V
RRM
I
FSM
V
F
T
J
CHARACTERISTICS
Rectangular waveform
Range
t
p
= 5 µs sine
10 Apk, T
J
= 125 °C (per leg)
Range
VALUES
20
35 to 45
1060
0.57
- 55 to 175
UNITS
A
V
A
V
°C
VOLTAGE RATINGS
PARAMETER
Maximum DC reverse voltage
Maximum working peak reverse voltage
SYMBOL
V
R
V
RWM
20CTQ035PbF
35
20CTQ040PbF
40
20CTQ045PbF
45
UNITS
V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Maximum average forward current
See fig. 5
Maximum peak one cycle non-repetitive
surge current per leg
See fig. 7
Non-repetitive avalanche energy per leg
Repetitive avalanche current per leg
SYMBOL
I
F(AV)
TEST CONDITIONS
50 % duty cycle at T
C
= 145 °C, rectangular waveform
5 µs sine or 3 µs rect. pulse
I
FSM
10 ms sine or 6 ms rect. pulse
E
AS
I
AR
Following any rated load
condition and with rated
V
RRM
applied
VALUES
20
1060
265
13
2.0
mJ
A
A
UNITS
T
J
= 25 °C, I
AS
= 2.0 A, L = 6.5 mH
Current decaying linearly to zero in 1 µs
Frequency limited by T
J
maximum V
A
= 1.5 x V
R
typical
* Pb containing terminations are not RoHS compliant, exemptions may apply
Document Number: 94162
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
1
20CTQ...PbF Series
Vishay High Power Products
ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
10 A
Maximum forward voltage drop per leg
See fig. 1
V
FM (1)
20 A
10 A
20 A
Maximum reverse leakage current per leg
See fig. 2
Maximum junction capacitance per leg
Typical series inductance per leg
Maximum voltage rate of change
Note
(1)
Pulse width < 300 µs, duty cycle < 2 %
I
RM (1)
C
T
L
S
dV/dt
T
J
= 25 °C
T
J
= 125 °C
TEST CONDITIONS
T
J
= 25 °C
VALUES
0.64
0.76
0.57
0.68
2
15
900
8.0
10 000
mA
pF
nH
V/µs
V
UNITS
Schottky Rectifier, 20 A
T
J
= 125 °C
V
R
= Rated V
R
V
R
= 5 V
DC
(test signal range 100 kHz to 1 MHz) 25 °C
Measured lead to lead 5 mm from package body
Rated V
R
THERMAL - MECHANICAL SPECIFICATIONS
PARAMETER
Maximum junction and storage
temperature range
Maximum thermal resistance,
junction to case per leg
Maximum thermal resistance,
junction to case per package
Typical thermal resistance,
case to heatsink
Approximate weight
minimum
maximum
SYMBOL
T
J
, T
Stg
DC operation
See fig. 4
DC operation
R
thCS
Mounting surface, smooth and greased
TEST CONDITIONS
VALUES
- 55 to 175
3.25
1.63
0.50
2
0.07
6 (5)
12 (10)
g
oz.
kgf · cm
(lbf · in)
20CTQ045
°C/W
UNITS
°C
R
thJC
Mounting torque
Marking device
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For technical questions, contact: diodes-tech@vishay.com
Document Number: 94162
Revision: 02-Jul-07
20CTQ...PbF Series
Schottky Rectifier, 20 A
Vishay High Power Products
I
F
- Instantaneous Forward Current (A)
1000
1000
100
I
R
- Reverse Current (mA)
100
10
1
0.1
T
J
= 175 °C
T
J
= 150 °C
T
J
= 125 °C
T
J
= 100 °C
10
1
T
J
= 175 °C
T
J
= 125 °C
T
J
= 25 °C
T
J
= 75 °C
0.01
0.001
0.0001
T
J
= 25 °C
0
5
10
15
T
J
= 50 °C
0.1
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
20
25
30
35
40
45
V
FM
- Forward Voltage Drop (V)
Fig. 1 - Maximum Forward Voltage Drop Characteristics
(Per Leg)
V
R
- Reverse Voltage (V)
Fig. 2 - Typical Values of Reverse Current vs.
Reverse Voltage (Per Leg)
1000
C
T
- Junction Capacitance (pF)
T
J
= 25 °C
100
0
10
20
30
40
50
V
R
- Reverse Voltage (V)
Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage (Per Leg)
Z
thJC
- Thermal Impedance (°C/W)
10
1
0.1
0.01
Single pulse
(thermal resistance)
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
P
DM
t
1
t
2
Notes:
1. Duty factor D = t
1
/t
2
2. Peak T
J
= P
DM
x Z
thJC
+ T
C
0.1
1
10
100
0.001
0.00001
0.0001
0.001
0.01
t
1
- Rectangular Pulse Duration (s)
Fig. 4 - Maximum Thermal Impedance Z
thJC
Characteristics (Per Leg)
Document Number: 94162
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
3
20CTQ...PbF Series
Vishay High Power Products
180
Schottky Rectifier, 20 A
9
Allowable Case Temperature (°C)
Average Power Loss (W)
175
170
165
160
155
150
145
0
5
20CTQ
R
thJC
(DC) = 3.25 °C/W
8
7
6
5
4
3
2
1
0
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS limit
DC
DC
10
15
0
5
10
15
I
F(AV)
- Average Forward Current (A)
Fig. 5 - Maximum Allowable Case Temperature vs.
Average Forward Current (Per Leg)
I
F(AV)
- Average Forward Current (A)
Fig. 6 - Forward Power Loss Characteristics (Per Leg)
I
FSM
- Non-Repetitive Surge Current (A)
1000
At any rated load condition
and with rated V
RRM
applied
following surge
100
10
100
1000
10 000
t
p
- Square Wave Pulse Duration (µs)
Fig. 7 - Maximum Non-Repetitive Surge Current (Per Leg)
L
High-speed
switch
Freewheel
diode
40HFL40S02
+ V
d
= 25 V
D.U.T.
IRFP460
R
g
= 25
Ω
Current
monitor
Fig. 8 - Unclamped Inductive Test Circuit
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For technical questions, contact: diodes-tech@vishay.com
Document Number: 94162
Revision: 02-Jul-07
20CTQ...PbF Series
Schottky Rectifier, 20 A
Vishay High Power Products
ORDERING INFORMATION TABLE
Device code
20
1
C
2
T
3
Q
4
045 PbF
5
6
1
2
3
4
5
6
-
-
Current rating (20 = 20 A)
Circuit configuration
C = Common cathode
-
Package
T = TO-220
035 = 35 V
040 = 40 V
045 = 45 V
-
-
Schottky “Q” series
Voltage ratings
None = Standard production
PbF = Lead (Pb)-free
-
Tube standard pack quantity: 50 pieces
LINKS TO RELATED DOCUMENTS
Dimensions
Part marking information
http://www.vishay.com/doc?95222
http://www.vishay.com/doc?95215
Document Number: 94162
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
5
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