Bulletin PD-20842 rev. B 05/06
20CTQ...PbF Series
20 Amp
SCHOTTKY RECTIFIER
IF(AV) = 20Amp
VR = 35/ 45V
Major Ratings and Characteristics
Description/ Features
Characteristics
Values
Units
IF(AV) Rectangular
20
A
VRRM range
35/ 45
V
IFSM @ tp = 5 μs sine
1060
A
VF
@ 10 Apk, TJ = 125°C
0.57
V
TJ
range
- 55 to 175
°C
waveform
(per leg)
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, 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
Lead-Free ("PbF" suffix)
Case Styles
20CTQ...PbF
Base
Common
Cathode
2
1
Anode
2
Common
Cathode
3
Anode
TO-220
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1
20CTQ...PbF
Bulletin PD-20842 rev. B 05/06
Voltage Ratings
Part number
VR
20CTQ035PbF 20CTQ040PbF
Max. DC Reverse Voltage (V)
35
VRWM Max. Working Peak Reverse Voltage (V)
20CTQ045PbF
40
45
Absolute Maximum Ratings
Parameters
20CTQ Units
IF(AV) Max. Average Forward Current
20
A
Conditions
50% duty cycle @ TC = 145°C, rectangular wave form
* See Fig. 5
IFSM
Max. Peak One Cycle Non-Repetitive
1060
Surge Current (Per Leg) * See Fig. 7
265
EAS
Non-Repetitive Avalanche Energy
(Per Leg)
13
mJ
IAR
Repetitive Avalanche Current
(Per Leg)
2.0
A
A
Following any rated
load condition and with
10ms Sine or 6ms Rect. pulse rated VRRM applied
5μs Sine or 3μs Rect. pulse
TJ = 25 °C, IAS = 2.0 Amps, L = 6.5 mH
Current decaying linearly to zero in 1 μsec
Frequency limited by TJ max. V A = 1.5 x VR typical
Electrical Specifications
Parameters
VFM
Max. Forward Voltage Drop
Conditions
0.64
V
@ 10A
0.76
0.57
V
V
@ 20A
@ 10A
0.68
V
@ 20A
Max. Reverse Leakage Current
2
mA
TJ = 25 °C
(Per Leg) * See Fig. 2
15
mA
TJ = 125 °C
(Per Leg) * See Fig. 1
IRM
20CTQ Units
(1)
(1)
TJ = 25 °C
TJ = 125 °C
VR = rated VR
CT
Max. Junction Capacitance (Per Leg)
900
pF
VR = 5VDC (test signal range 100Khz to 1Mhz) 25°C
LS
Typical Series Inductance (Per Leg)
8.0
nH
Measured lead to lead 5mm from package body
10000
V/ μs
dv/dt Max. Voltage Rate of Change
(Rated V R)
(1) Pulse Width < 300μs, Duty Cycle <2%
Thermal-Mechanical Specifications
Parameters
20CTQ Units
TJ
Max. Junction Temperature Range
-55 to 175
Tstg
Max. Storage Temperature Range
-55 to 175
Conditions
°C
°C
RthJC Max. Thermal Resistance Junction
to Case (Per Leg)
3.25
°C/W DC operation
RthJC Max. Thermal Resistance Junction
to Case (Per Package)
1.63
°C/W DC operation
RthCS Typical Thermal Resistance, Case
to Heatsink
0.50
°C/W Mounting surface , smooth and greased
wt
Approximate Weight
T
Mounting Torque
Marking Device
2
2 (0.07)
g (oz.)
Min.
6 (5)
Max.
12 (10)
Kg-cm
(Ibf-in)
* See Fig. 4
20CTQ045
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20CTQ...PbF
Bulletin PD-20842 rev. B 05/06
1000
ReverseCurrent - I (mA)
R
1000
T =175°C
J
10
150°C
125°C
1
100°C
.1
75°C
50°C
.01
25°C
.001
.0001
0
5
10 15 20 25 30 35 40 45
ReverseVoltage- VR (V)
10
T =175°C
J
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
T =125°C
J
1000
T = 25°C
J
JunctionCapacitance- C (pF)
T
InstantaneousForwardCurrent - I (A)
F
100
100
1
.1
0
.2
.4
.6
.8
1
1.2
1.4
T =25°C
J
100
0
1.6 1.8
10
20
30
40
50
ReverseVoltage- V (V)
R
ForwardVoltageDrop- V (V)
FM
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
Thermal Impedance-ZthJC(°C/W
)
10
1
D=0.50
D=0.33
D=0.25
D=0.17
D=0.08
P
DM
t
1
t
2
.1
Notes:
1. Dutyfactor D= t / t
1 2
.01
SinglePulse
(Thermal Resistance)
.001
.00001
.0001
.001
2. PeakT =P xZ
+T
J DM thJC C
.01
.1
1
10
100
t , Rectangular PulseDuration(Seconds)
1
Fig. 4 - Max. Thermal Impedance ZthJC Characteristics (Per Leg)
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3
20CTQ...PbF
Bulletin PD-20842 rev. B 05/06
9
20CTQ
RthJC (DC) =3.25°C/W
175
AveragePower Loss- (W
atts)
AllowableCaseTemperature- (°C)
180
170
165
160
DC
155
150
D=0.08
8 D=0.17
D=0.25
7
D=0.33
6 D=0.50
5
DC
4 RMSLimit
3
2
1
145
0
5
0
0
15
10
5
10
15
AverageForwardCurrent - I
(A)
F(AV)
AverageForwardCurrent - IF(AV) (A)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
Non-Repetitive Surge Current - I
FSM
(A)
1000
At Any Rated Load Condition
And With Rated VRRM Applied
Following Surge
100
10
100
1000
10000
Square Wave Pulse Duration - t p (microsec)
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
L
DUT
IRFP460
Rg = 25 ohm
CURRENT
MONITOR
HIGH-SPEED
SWITCH
FREE-WHEEL
DIODE
+
Vd = 25 Volt
40HFL40S02
Fig. 8 - Unclamped Inductive Test Circuit
4
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20CTQ...PbF
Bulletin PD-20842 rev. B 05/06
Outline Table
Conform to JEDEC outline TO-220AB
Part Marking Information
IRXC Assembly Line - SubCon Assembly Line
EXAMPLE: THIS IS A 20CTQ045
LOT CODE 1789
ASSEMBLED ON WW 19, 2001
IN THE ASSEMBLY LINE "C"
IRMX Assembly Line
EXAMPLE: THIS IS A 20CTQ045
LOT CODE 1789
ASSEMBLED ON WW 19, 2001
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INTERNATIONAL
RECTIFIER
LOGO
ASSEMBLY
LOT CODE
INTERNATIONAL
RECTIFIER
LOGO
ASSEMBLY
LOT CODE
PART NUMBER
DATE CODE
P = LEAD-FREE
YEAR 1 = 2001
WEEK 19
LINE C
PART NUMBER
DATE CODE
YEAR 1 = 2001
WEEK 19
P = LEAD-FREE
5
20CTQ...PbF
Bulletin PD-20842 rev. B 05/06
Ordering Information Table
Device Code
20
C
T
Q
1
2
3
4
045 PbF
5
1
-
Current Rating (20 = 20A)
2
-
Circuit Configuration
3
-
6
C = Common Cathode
Package
T = TO-220
4
-
Schottky "Q" Series
5
-
Voltage Ratings
6
-
y none = Standard Production
035 = 35V
040 = 40V
045 = 45V
y PbF = Lead-Free
Tube Standard Pack Quantity : 50 pieces
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level and Lead-Free.
Qualification Standards can be found on IR's Web site.
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7309
Visit us at www.irf.com for sales contact information. 05/06
6
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