20TQ...PbF Series
Vishay High Power Products
Schottky Rectifier, 20 A
®
FEATURES
• 150 °C T
J
operation
• Low forward voltage drop
Base
cathode
2
Pb-free
Available
• High frequency operation
• High purity, high temperature epoxy
encapsulation for enhanced mechanical
strength and moisture resistance
RoHS*
COMPLIANT
TO-220AC
1
Cathode
3
Anode
• 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 20TQ...PbF Schottky rectifier series has been optimized
for very low forward voltage drop, with moderate leakage.
The proprietary barrier technology allows for reliable
operation up to 150 °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
20 Apk, T
J
= 125 °C
Range
VALUES
20
35 to 45
1800
0.51
- 55 to 150
UNITS
A
V
A
V
°C
VOLTAGE RATINGS
PARAMETER
Maximum DC reverse voltage
Maximum working peak reverse voltage
SYMBOL
V
R
V
RWM
20TQ035PbF
35
20TQ040PbF
40
20TQ045PbF
45
UNITS
V
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Maximum average forward current
See fig. 5
Maximum peak one cycle
non-repetitive surge current
See fig. 7
Non-repetitive avalanche energy
Repetitive avalanche current
SYMBOL
I
F(AV)
TEST CONDITIONS
50 % duty cycle at T
C
= 116 °C, rectangular waveform
5 µs sine or 3 µs rect. pulse
I
FSM
E
AS
I
AR
Following any rated load
condition and with rated
10 ms sine or 6 ms rect. pulse V
RRM
applied
VALUES
20
1800
400
27
4
mJ
A
A
UNITS
T
J
= 25 °C, I
AS
= 4 A, L = 3.4 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: 94167
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
1
20TQ...PbF Series
Vishay High Power Products
ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
20 A
Maximum forward voltage drop
See fig. 1
V
FM (1)
40 A
20 A
40 A
Maximum reverse leakage curent
See fig. 2
Maximum junction capacitance
Typical series inductance
Maximum voltage rate of change
I
RM (1)
C
T
L
S
dV/dt
T
J
= 25 °C
T
J
= 125 °C
TEST CONDITIONS
T
J
= 25 °C
VALUES
0.57
0.73
0.51
0.67
2.7
105
1400
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
Note
(1)
Pulse width < 300 µs, duty cycle < 2 %
THERMAL - MECHANICAL SPECIFICATIONS
PARAMETER
Maximum junction and storage
temperature range
Maximum thermal resistance,
junction to case
Typical thermal resistance,
case to heatsink
Approximate weight
minimum
maximum
SYMBOL
T
J
, T
Stg
R
thJC
R
thCS
DC operation
See fig. 4
Mounting surface, smooth and greased
TEST CONDITIONS
VALUES
- 55 to 150
1.50
°C/W
0.50
2
0.07
6 (5)
12 (10)
20TQ045
g
oz.
kgf · cm
(lbf · in)
UNITS
°C
Mounting torque
Marking device
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2
For technical questions, contact: diodes-tech@vishay.com
Document Number: 94167
Revision: 02-Jul-07
20TQ...PbF Series
Schottky Rectifier, 20 A
Vishay High Power Products
1000
1000
T
J
= 150 °C
I
F
- Instantaneous Forward
Current (A)
I
R
- Reverse Current (mA)
100
T
J
= 125 °C
10
1
0.1
0.01
0.001
T
J
= 100 °C
T
J
= 75 °C
T
J
= 50 °C
100
10
T
J
= 150 °C
T
J
= 125 °C
T
J
= 25 °C
1
T
J
= 25 °C
0.1
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
0
5
10
15
20
25
30
35
40
45
V
FM
- Forward Voltage Drop (V)
Fig. 1 - Maximum Forward Voltage Drop Characteristics
V
R
- Reverse Voltage (V)
Fig. 2 - Typical Values of Reverse Current vs.
Reverse Voltage
10 000
C
T
- Junction Capacitance (pF)
1000
T
J
= 25 °C
100
0
10
20
30
40
50
V
R
- Reverse Voltage (V)
Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage
Z
thJC
- Thermal Impedance (°C/W)
10
1
0.1
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
0.01
0.1
P
DM
t
1
t
2
0.01
Single pulse
(thermal resistance)
Notes:
1. Duty factor D = t
1
/t
2
.
2. Peak T
J
= P
DM
x Z
thJC
+ T
C
1
10
.
100
0.001
0.00001
0.0001
0.001
t
1
- Rectangular Pulse Duration (s)
Fig. 4 - Maximum Thermal Impedance Z
thJC
Characteristics
Document Number: 94167
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
3
20TQ...PbF Series
Vishay High Power Products
155
Schottky Rectifier, 20 A
Allowable Case Temperature (°C)
18
Average Power Loss (W)
20TQ
R
thJC
(DC) = 1.50 °C/W
145
16
14
12
10
8
6
4
2
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS limit
DC
135
DC
125
115
0
5
10
15
20
25
30
0
0
5
10
15
20
25
30
I
F(AV)
- Average Forward Current (A)
Fig. 5 - Maximum Allowable Case Temperature vs.
Average Forward Current
I
F(AV)
- Average Forward Current (A)
Fig. 6 - Forward Power Loss Characteristics
10 000
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
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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4
For technical questions, contact: diodes-tech@vishay.com
Document Number: 94167
Revision: 02-Jul-07
20TQ...PbF Series
Schottky Rectifier, 20 A
Vishay High Power Products
ORDERING INFORMATION TABLE
Device code
20
1
T
2
Q
3
045 PbF
4
5
1
2
3
4
5
-
-
-
-
-
Current rating (20 = 20 A)
Package
T = TO-220
Schottky “Q” series
Voltage ratings
None = Standard production
PbF = Lead (Pb)-free
035 = 35 V
040 = 40 V
045 = 45 V
Tube standard pack quantity: 50 pieces
LINKS TO RELATED DOCUMENTS
Dimensions
Part marking information
http://www.vishay.com/doc?95221
http://www.vishay.com/doc?95216
Document Number: 94167
Revision: 02-Jul-07
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
5
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