SCHOTTKY RECTIFIER 20 Amp
20CTQ...PbF Series
www.irf.com 1
Bulletin PD-20842 rev. B 05/06
Major Ratings and Characteristics
IF(AV) Rectangular 20 A
waveform
VRRM range 35/ 45 V
IFSM @ tp = 5 μs sine 1060 A
VF@ 10 Apk, TJ
= 125°C 0.57 V
(per leg)
TJrange - 55 to 175 °C
Characteristics Values Units
Description/ Features
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)
IF(AV) = 20Amp
VR = 35/ 45V
Case Styles
TO-220
20CTQ...PbF
Anode
13
2
Base
Common
Cathode
2
A
node
Common
Cathode
20CTQ...PbF
2
Bulletin PD-20842 rev. B 05/06
www.irf.com
IF(AV) Max. Average Forward Current 20 A 50% duty cycle @ TC = 145°C, rectangular wave form
* See Fig. 5
IFSM Max. Peak One Cycle Non-Repetitive 1060 5μs Sine or 3μs Rect. pulse
Surge Current (Per Leg) * See Fig. 7 265 10ms Sine or 6ms Rect. pulse
EAS Non-Repetitive Avalanche Energy 13 mJ TJ = 25 °C, IAS
= 2.0 Amps, L = 6.5 mH
(Per Leg)
IAR Repetitive 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
TJMax. Junction Temperature Range -55 to 175 °C
Tstg Max. Storage Temperature Range -55 to 175 °C
RthJC Max. Thermal Resistance Junction 3.25 °C/W DC operation * See Fig. 4
to Case (Per Leg)
RthJC Max. Thermal Resistance Junction 1.63 °C/W DC operation
to Case (Per Package)
RthCS Typical Thermal Resistance, Case 0.50 °C/W Mounting surface , smooth and greased
to Heatsink
wt Approximate Weight 2 (0.07) g (oz.)
T Mounting Torque Min. 6 (5)
Max. 12 (10)
Marking Device 20CTQ045
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
VFM Max. 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
IRM Max. 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
Electrical Specifications
(1) Pulse Width < 300μs, Duty Cycle <2%
VR = rated VR
Absolute Maximum Ratings
Following any rated
load condition and with
rated VRRM
applied
Parameters 20CTQ Units Conditions
A
Part number 20CTQ035PbF 20CTQ040PbF 20CTQ045PbF
VRMax. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V)
Voltage Ratings
35 40 45
Parameters 20CTQ Units Conditions
Parameters 20CTQ Units Conditions
20CTQ...PbF
3
Bulletin PD-20842 rev. B 05/06
www.irf.com
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
Fig. 4 - Max. Thermal Impedance ZthJC Characteristics (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
.0001
.001
.01
.1
1
10
100
1000
0 5 10 15 20 25 30 35 40 45
R
R
T = 175°C
150°C
125°C
100°C
75°C
50°C
25°C
J
Reverse Voltage - V (V)
Reverse Current - I (mA)
100
1000
0 1020304050
T = 25°C
J
Reverse Voltage - V (V)
R
T
Junction Capacitance - C (pF)
.1
1
10
100
1000
0.2.4.6.811.21.41.61.8
FM
F
Instantaneous Forward Current - I (A)
T = 175°C
T = 125°C
T = 25°C
J
J
J
Forward Voltage Drop - V (V)
.001
.01
.1
1
10
.00001 .0001 .001 .01 .1 1 10 100
D = 0.33
D = 0.50
D = 0.25
D = 0.17
D = 0.08
1
thJC
t , Rectangular Pulse Durat i on (Seconds)
Thermal Impedance - Z (°C/W)
Single Pulse
(Thermal Resi stance)
2
t
1
t
P
DM
Not es:
1. Duty factor D = t / t
2. Peak T = P x Z + T
1
JDMthJCC
2
20CTQ...PbF
4
Bulletin PD-20842 rev. B 05/06
www.irf.com
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
145
150
155
160
165
170
175
180
05101
5
DC
Al l owable Case Temperature - (°C)
Average Forward Current - I (A)
F(AV)
20CTQ
R (DC) = 3. 25°C/W
thJC
0
1
2
3
4
5
6
7
8
9
0 5 10 15
DC
Average Power Loss - (Watt s)
F(AV)
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS Li mit
Average Forward Current - I (A)
100
1000
10 100 1000 10000
FSM
p
Non-Repetitive Surge Current - I (A)
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Square Wave Pulse Duration - t (microsec)
FREE- W HEEL
DIODE
40HFL40S02
C URRENT
MONITOR
HI G H- SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm Vd = 25 Volt
+
20CTQ...PbF
5
Bulletin PD-20842 rev. B 05/06
www.irf.com
INTERNATIONAL
RECTIFIER
ASSEMBLY
LOT CODE
EXAMPLE:
IRMX Assembly Line
ASSEMBLED ON WW 19, 2001
LOT CODE 1789
LOGO
P = LEAD-FREE
PART NUMBER
DATE CODE
YEAR 1 = 2001
WEEK 19
THIS IS A 20CTQ045
Part Marking Information
INTERNATIONAL
RECTIFIER
ASSEMBLY
LOT CODE
EXAMPLE:
ASSEMBLED ON WW 19, 2001
IN THE ASSEMBLY LINE "C"
THIS IS A 20CTQ045
LOT CODE 1789
LOGO
WEEK 19
LINE C
PART NUMBER
DATE CODE
P = LEAD-FREE
YEAR 1 = 2001
IRXC Assembly Line - SubCon Assembly Line
Outline Table
Conform to JEDEC outline TO-220AB
20CTQ...PbF
6
Bulletin PD-20842 rev. B 05/06
www.irf.com
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
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.
Ordering Information Table
20 C T Q 045 PbF
Device Code
152 4
36
1- Current Rating (20 = 20A)
2- Circuit Configuration
C = Common Cathode
3- Package
T = TO-220
4- Schottky "Q" Series
5- Voltage Ratings
6-y none = Standard Production
y PbF = Lead-Free
Tube Standard Pack Quantity : 50 pieces
035 = 35V
040 = 40V
045 = 45V
