Vishay 20CTQ..., 20CTQ...S, 20CTQ... -1 Data Sheet
Bulletin PD-20056 rev. A 12/01
A
A
A
20CTQ...
20CTQ...S
20CTQ... -1
SCHOTTKY RECTIFIER
Major Ratings and Characteristics
Characteristics 20CTQ Units
I
Rectangular 20 A
F(AV)
waveform
V
range 35 to 45 V
RRM
I
@ tp = 5 µs sine 1060 A
FSM
VF@ 10 Apk, TJ = 125°C 0.57 V
(per leg)
TJrange - 55 to 175 °C
20CTQ... 20CTQ... S 20CTQ... -1
I
F(AV)
VR = 35 to 45V
Description/Features
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 TJ 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
Case Styles
20 Amp
= 20Amp
Base
Common
Cathode
2
2
1
Common
3
Cathode
node
Anode
TO-220 D2PAK
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node
1
Base
Common
Cathode
Common
Cathode
Base
Common
node
Cathode
2
2
1
Common
3
Cathode
Anode
2
2
3
Anode
TO-262
1
20CTQ... Series
Bulletin PD-20056 rev. A 12/01
Voltage Ratings
Part number 20CTQ035 20CTQ040 20CTQ045
VRMax. DC Reverse Voltage (V)
V
Max. Working Peak Reverse Voltage (V)
RWM
35 40 45
Absolute Maximum Ratings
Parameters 20CTQ Units Conditions
I
Max. Average Forward Current 20 A 50% duty cycle @ TC = 145°C, rectangular wave form
F(AV)
* See Fig. 5
I
Max. Peak One Cycle Non-Repetitive 1060 5µs Sine or 3µs Rect. pulse
FSM
A
Surge Current (Per Leg) * See Fig. 7 265 10ms Sine or 6ms Rect. pulse
EASNon-Repetitive Avalanche Energy 13 mJ T
(Per Leg)
= 25 °C, I
J
= 2.0 Amps, L = 6.5 mH
AS
IARRepetitive Avalanche Current 2.0 A Current decaying linearly to zero in 1 µsec
(Per Leg) Frequency limited by TJ max. VA = 1.5 x VR typical
Following any rated
load condition and with
rated V
RRM
applied
Electrical Specifications
Parameters 20CTQ Units Conditions
VFMMax. Forward Voltage Drop 0.64 V @ 10A
(Per Leg) * See Fig. 1 (1) 0.76 V @ 20A
0.57 V @ 10A
0.68 V @ 20A
IRMMax. Reverse Leakage Current 2 mA TJ = 25 °C
(Per Leg) * See Fig. 2 (1) 15 mA TJ = 125 °C
CTMax. Junction Capacitance (Per Leg) 900 pF VR = 5VDC, (test signal range 100Khz to 1Mhz) 25°C
LSTypical Series Inductance (Per Leg) 8.0 nH Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change 10000 V/ µs
(Rated VR)
TJ = 25 °C
TJ = 125 °C
VR = rated V
(1) Pulse Width < 300µs, Duty Cycle <2%
R
Thermal-Mechanical Specifications
Parameters 20CTQ Units Conditions
TJMax. Junction Temperature Range -55 to 175 °C
T
Max. Storage Temperature Range -55 to 175 °C
stg
R
Max. Thermal Resistance Junction 3.25 °C/W DC operation * See Fig. 4
thJC
to Case (Per Leg)
R
Max. Thermal Resistance Junction 1.63 °C/W DC operation
thJC
to Case (Per Package)
R
Typical Thermal Resistance, Case 0.50 °C/W Mounting surface , smooth and greased
thCS
to Heatsink
wt Approximate Weight 2 (0.07) g (oz.)
T Mounting Torque Min. 6 (5)
Max. 12 (10)
Kg-cm
(Ibf-in)
2
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20CTQ... Series
5
8
Bulletin PD-20056 rev. A 12/01
1000
100
F
10
In stant aneous Forwar d Current - I (A)
1
T = 175°C
J
T = 125°C
J
T = 25°C
J
1000
100
T = 175°C
J
10
R
1
.1
.01
Rever se Current - I (mA)
.001
.0001
150°C
125°C
100°C
75°C
50°C
25°C
0 5 10 15 20 25 30 35 40 4
Reverse Voltage - V (V)
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
1000
T
T = 25°C
J
Junct ion Capacit ance - C (pF)
R
.1
0.2.4.6.811.21.41.61.
Fig. 1 - Max. Forward Voltage Drop Characteristics
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100
0 1020304050
For ward Voltage Drop - V (V)
FM
Reverse Voltage - V (V)
Fig. 3 - Typical Junction Capacitance
(Per Leg)
10
D = 0.50
D = 0.33
1
thJC
Ther mal Impedance - Z (°C/W)
D = 0.25
D = 0.17
D = 0.08
.1
Not e s :
.01
Singl e Pulse
(Thermal Resist ance)
.001
.00001 .0001 . 001 . 01 .1 1 10 100
t , Rectangul ar Puls e Durat ion ( Seconds)
1
Fig. 4 - Max. Thermal Impedance Z
thJC
1. Duty factor D = t / t
2. Peak T = P x Z + T
Characteristics (Per Leg)
Vs. Reverse Voltage (Per Leg)
P
DM
t
1
t
2
JDMthJC
R
1
2
C
3
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