Document Number: 93955 For technical questions, contact: diodes-tech@vishay.com www.vishay.com
Revision: 22-Aug-08 1
Schottky Rectifier, 20 A
20TQ...S
Vishay High Power Products
FEATURES
• 150 °C TJ operation
• Low forward voltage drop
• High frequency operation
• High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
• Guard ring for enhanced ruggedness and long term
reliability
• Designed and qualified for Q101 level
DESCRIPTION
The 20TQ... 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.
PRODUCT SUMMARY
IF(AV) 20 A
VR35 to 45 V
Base
cathode
D
2
PAK N/C Anode
13
2
MAJOR RATINGS AND CHARACTERISTICS
SYMBOL CHARACTERISTICS VALUES UNITS
IF(AV) Rectangular waveform 20 A
VRRM Range 35 to 45 V
IFSM tp = 5 µs sine 1800 A
VF20 Apk, TJ = 125 °C 0.51 V
TJRange - 55 to 150 °C
VOLTAGE RATINGS
PARAMETER SYMBOL 20TQ035S 20TQ040S 20TQ045S UNITS
Maximum DC reverse voltage VR35 40 45 V
Maximum working peak reverse voltage VRWM
ABSOLUTE MAXIMUM RATINGS
PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS
Maximum average forward current
See fig. 5 IF(AV) 50 % duty cycle at TC = 116 °C, rectangular waveform 20
A
Maximum peak one cycle
non-repetitive surge current
See fig. 7
IFSM
5 µs sine or 3 µs rect. pulse Following any rated load
condition and with rated
VRRM applied
1800
10 ms sine or 6 ms rect. pulse 400
Non-repetitive avalanche energy EAS TJ = 25 °C, IAS = 4 A, L = 3.40 mH 27 mJ
Repetitive avalanche current IAR
Current decaying linearly to zero in 1 µs
Frequency limited by TJ maximum VA = 1.5 x VR typical 4A
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2Revision: 22-Aug-08
20TQ...S
Vishay High Power Products Schottky Rectifier, 20 A
Note
(1) Pulse width < 300 µs, duty cycle < 2 %
ELECTRICAL SPECIFICATIONS
PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS
Maximum forward voltage drop
See fig. 1 VFM (1)
20 A TJ = 25 °C 0.57
V
40 A 0.73
20 A TJ = 125 °C 0.51
40 A 0.67
Maximum reverse leakage current
See fig. 2 IRM (1) TJ = 25 °C VR = Rated VR
2.7 mA
TJ = 125 °C 105
Maximum junction capacitance CTVR = 5 VDC (test signal range 100 kHz to 1 MHz) 25 °C 1400 pF
Typical series inductance LSMeasured lead to lead 5 mm from package body 8.0 nH
Maximum voltage rate of change dV/dt Rated VR10 000 V/µs
THERMAL - MECHANICAL SPECIFICATIONS
PARAMETER SYMBOL TEST CONDITIONS VALUES UNITS
Maximum junction and storage
temperature range TJ, TStg - 55 to 150 °C
Maximum thermal resistance,
junction to case RthJC DC operation
See fig. 4 1.50
°C/W
Typical thermal resistance,
case to heatsink RthCS Mounting surface, smooth and greased 0.50
Approximate weight 2g
0.07 oz.
Mounting torque minimum 6 (5) kgf ⋅ cm
(lbf ⋅ in)
maximum 12 (10)
Marking device Case style D2PAK
20TQ035S
20TQ040S
20TQ045S
Document Number: 93955 For technical questions, contact: diodes-tech@vishay.com www.vishay.com
Revision: 22-Aug-08 3
20TQ...S
Schottky Rectifier, 20 A Vishay High Power Products
Fig. 1 - Maximum Forward Voltage Drop Characteristics Fig. 2 - Typical Values of Reverse Current vs.
Reverse Voltage
Fig. 3 - Typical Junction Capacitance vs. Reverse Voltage
Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics
0.1
10
100
1
1000
IF - Instantaneous
Forward Current (A)
VFM - Forward Voltage Drop (V)
0.2 0.6 1.2 1.6 1.81.40.80.40 1.0
TJ = 150 °C
TJ = 125 °C
TJ = 25 °C
0.001
1
100
10
0.1
0.01
1000
I
R
- Reverse Current (mA)
V
R
- Reverse Voltage (V)
515 30
40 45
352010025
TJ = 125 °C
TJ = 150 °C
TJ = 100 °C
TJ = 75 °C
TJ = 50 °C
TJ = 25 °C
100
10 000
C
T
- Junction Capacitance (pF)
V
R
- Reverse Voltage (V)
10 20 30 40050
TJ = 25 °C
0.001
0.1
0.01
1
10
0.00001 0.0001 0.001 0.01 0.1 1
t1 - Rectangular Pulse Duration (s)
ZthJC - Thermal Impedance (°C/W)
10 100
Single pulse
(thermal resistance)
D = 0.50
D = 0.33
D = 0.25
D = 0.17
D = 0.08
PDM
t1
t2
Notes:
1. Duty factor D = t1/t2
2. Peak TJ = PDM x ZthJC + TC
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4Revision: 22-Aug-08
20TQ...S
Vishay High Power Products Schottky Rectifier, 20 A
Fig. 5 - Maximum Allowable Case Temperature vs.
Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
Fig. 8 - Unclamped Inductive Test Circuit
115
145
135
125
155
Allowable Case Temperature (°C)
IF(AV) - Average Forward Current (A)
52025
30
10015
20TQ
RthJC (DC) = 1.50 °C/W
DC
0
8
6
4
2
18
16
14
12
10
Average Power Loss (W)
I
F(AV)
- Average Forward Current (A)
515 302010025
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS limit
DC
100
1000
10 000
IFSM - Non-Repetitive Surge Current (A)
tp - Square Wave Pulse Duration (µs)
100 10 000
100010
At any rated load condition
and with rated VRRM applied
following surge
Current
monitor
High-speed
switch
D.U.T.
Rg = 25 Ω
+
Freewheel
diode Vd = 25 V
L
IRFP460
40HFL40S02
Document Number: 93955 For technical questions, contact: diodes-tech@vishay.com www.vishay.com
Revision: 22-Aug-08 5
20TQ...S
Schottky Rectifier, 20 A Vishay High Power Products
ORDERING INFORMATION TABLE
1- Current rating (20 A)
2- Package:
T = TO-220
3- Schottky “Q” series
4- Voltage ratings
5- S = D2PAK
6- None = Tube (50 pieces)
TRL = Tape and reel (left oriented)
TRR = Tape and reel (right oriented)
7- None = Standard production
PbF = Lead (Pb)-free
035 = 35 V
040 = 40 V
045 = 45 V
Device code
51324
67
20 T Q 045 S TRL -
LINKS TO RELATED DOCUMENTS
Dimensions http://www.vishay.com/doc?95014
Part marking information http://www.vishay.com/doc?95008
Packaging information http://www.vishay.com/doc?95032
Document Number: 91000 www.vishay.com
Revision: 18-Jul-08 1
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All product specifications and data are subject to change without notice.
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(collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this
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