18TQ...S
Vishay High Power Products
Schottky Rectifier, 18 A
FEATURES
Base
cathode
2
• 175 °C T
J
operation
• Low forward voltage drop
• High frequency operation
• High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
1
D
2
PAK
N/C
3
Anode
• Guard ring for enhanced ruggedness and long term
reliability
• Designed and qualified for Q101 level
DESCRIPTION
PRODUCT SUMMARY
I
F(AV)
V
R
18 A
35 to 45 V
The 18TQ... 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
18 Apk, T
J
= 125 °C
Range
VALUES
18
35 to 45
1800
0.53
- 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
18TQ035S
35
18TQ040S
40
18TQ045S
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
= 149 °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
18
1800
A
390
24
3.6
mJ
A
UNITS
A
T
J
= 25 °C, I
AS
= 3.6 A, L = 3.7 mH
Current decaying linearly to zero in 1 µs
Frequency limited by T
J
maximum V
A
= 1.5 x V
R
typical
Document Number: 93950
Revision: 25-Jun-08
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
1
18TQ...S
Vishay High Power Products
ELECTRICAL SPECIFICATIONS
PARAMETER
SYMBOL
18 A
Maximum forward voltage drop
See fig. 1
V
FM (1)
36 A
18 A
36 A
Maximum reverse leakage current
See fig. 2
Maximum junction capacitance
Typical series inductance
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
0.60
0.72
0.53
0.67
2.5
25
1400
8.0
10 000
mA
pF
nH
V/µs
V
UNITS
Schottky Rectifier, 18 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
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 175
1.50
°C/W
0.50
2
0.07
6 (5)
12 (10)
g
oz.
kgf · cm
(lbf · in)
18TQ035S
Marking device
Case style D
2
PAK
18TQ040S
18TQ045S
UNITS
°C
Mounting torque
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2
For technical questions, contact: diodes-tech@vishay.com
Document Number: 93950
Revision: 25-Jun-08
18TQ...S
Schottky Rectifier, 18 A
Vishay High Power Products
1000
1000
I
F
- Instantaneous Forward
Current (A)
I
R
- Reverse Current (mA)
100
10
1
0.1
0.01
0.001
0.0001
T
J
= 175 °C
T
J
= 150 °C
T
J
= 125 °C
T
J
= 100 °C
T
J
= 75 °C
T
J
= 50 °C
T
J
= 25 °C
100
10
T
J
= 175 °C
T
J
= 125 °C
T
J
= 25 °C
1
0.1
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
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
P
DM
0.1
0.01
Single pulse
(thermal resistance)
0.001
0.00001
0.0001
0.001
0.01
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
t
1
t
2
Notes:
1. Duty factor D = t
1
/t
2
.
2. Peak T
J
= P
DM
x Z
thJC
+ T
C
1
10
.
100
0.1
t
1
- Rectangular Pulse Duration (s)
Fig. 4 - Maximum Thermal Impedance Z
thJC
Characteristics
Document Number: 93950
Revision: 25-Jun-08
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
3
18TQ...S
Vishay High Power Products
180
Schottky Rectifier, 18 A
Allowable Case Temperature (°C)
15
170
165
160
155
150
0
4
8
12
16
20
24
28
DC
Average Power Loss (W)
175
18TQ
R
thJC
(DC) = 1.50 °C/W
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
10
RMS limit
5
DC
0
0
4
8
12
16
20
24
28
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
I
FSM
- Non-Repetitive Surge Current (A)
10 000
At any rated load condition
and with rated V
RRM
applied
following surge
1000
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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For technical questions, contact: diodes-tech@vishay.com
Document Number: 93950
Revision: 25-Jun-08
18TQ...S
Schottky Rectifier, 18 A
Vishay High Power Products
ORDERING INFORMATION TABLE
Device code
18
1
1
2
3
4
5
6
-
-
-
-
-
-
T
2
Q
3
045
4
S
5
TRL
6
-
7
Current rating (18 A)
Circuit configuration
T = TO-220
Schottky “Q” series
Voltage ratings
S = D
2
PAK
None = Tube (50 pieces)
TRL = Tape and reel (left oriented)
TRR = Tape and reel (right oriented)
035 = 35 V
040 = 40 V
045 = 45 V
7
-
None = Standard production
PbF = Lead (Pb)-free
LINKS TO RELATED DOCUMENTS
Dimensions
Part marking information
Packaging information
SPICE model
http://www.vishay.com/doc?95014
http://www.vishay.com/doc?95008
http://www.vishay.com/doc?95032
http://www.vishay.com/doc?95280
Document Number: 93950
Revision: 25-Jun-08
For technical questions, contact: diodes-tech@vishay.com
www.vishay.com
5
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