Bulletin PD-21038 rev. A 07/06
47CTQ020SPbF
47CTQ020-1PbF
SCHOTTKY RECTIFIER
40 Amp
I
F(AV)
= 40Amp
V
R
= 20V
Major Ratings and Characteristics
Characteristics
I
F(AV)
Rectangular
waveform
V
RRM
I
FSM
@ tp = 5
μs
sine
V
F
T
J
@ 20 Apk, T
J
= 125 °C
Description/ Features
Units
A
V
A
V
°C
This center tap Schottky rectifier has been optimized for ultra
low forward voltage drop specifically for 3.3V output power
supplies. The proprietary barrier technology allows for reliable
operation up to 150 °C junction temperature. Typical applica-
tions are in parallel switching power supplies, converters,
reverse battery protection, and redundant power subsystems.
150 °C T
J
operation
Values
40
20
1000
0.34
- 55 to 150
Center tap configuration
Optimized for 3.3V application
Ultra low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Lead-Free ("PbF" suffix)
Case Styles
47CTQ020SPbF
47CTQ020-1PbF
Base
Common
Cathode
2
Base
Common
Cathode
2
1
Anode
2
Common
Cathode
3
1
Anode
Anode
2
Common
Cathode
3
Anode
D
2
PAK
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TO-262
1
47CTQ020SPbF, 47CTQ020-1PbF
Bulletin PD-21038 rev. A 07/06
Voltage Ratings
Part number
V
R
V
R
Max. DC Reverse Voltage (V)
Max. DC Reverse Voltage (V)
@ 125° C
@ 150° C
47CTQ020SPbF, 47CTQ020-1PbF
20
10
Absolute Maximum Ratings
Parameters
I
F(AV)
Max. Average Forward (Per Device)
Current
(Per Leg)
I
FSM
E
AS
I
AR
Max. Peak One Cycle Non-Repetitive
Surge Current (Per Leg)
Non-Repetitive Avalanche Energy
(Per Leg)
Repetitive Avalanche Current
(Per Leg)
47CTQ Units
40
20
1000
250
18
3
A
A
mJ
A
Conditions
50% duty cycle @ T
C
= 135°C, rectangular wave form
Following any rated
load condition and with
10ms Sine or 6ms Rect. pulse rated Vrrm applied
T
J
= 25 °C, I
AS
=3 Amps, L =3 mH
5μs Sine or 3μs Rect. pulse
Current decaying linearly to zero in 1
μsec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
Electrical Specifications
Parameters
V
FM
Max. Forward Voltage Drop
(Per Leg)
(1)
47CTQ Units
0.45
0.51
0.34
0.44
0.31
0.42
V
V
V
V
V
V
mA
mA
mA
mA
mA
V
mΩ
pF
nH
@ 20A
@ 40A
@ 20A
@ 40A
@ 20A
@ 40A
T
J
= 25 °C
T
J
= 125 °C
T
J
= 125 °C
T
J
= 125 °C
T
J
= 150 °C
T
J
= T
J
max.
Conditions
T
J
= 25 °C
T
J
= 125 °C
T
J
= 150 °C
V
R
= rated V
R
V
R
= 5V
V
R
= 3.3V
V
R
= 10V
I
RM
Max. Reverse Leakage Current
(Per Leg)
(1)
3
310
60
45
306
V
F(TO)
Threshold Voltage
r
t
Forward Slope Resistance
C
T
L
S
Max. Junction Capacitance (Per Leg)
Typical Series Inductance (Per Leg)
0.188
5.9
3000
5.5
10000
V
R
= 5V
DC
(test signal range 100Khz to 1Mhz) 25°C
Measured lead to lead 5mm from package body
(1) Pulse Width < 300μs, Duty Cycle <2%
dv/dt Max. Voltage Rate of Change
V/
μs
(Rated V
R
)
Thermal-Mechanical Specifications
Parameters
T
J
T
stg
Max. Junction Temperature Range
Max. Storage Temperature Range
47CTQ Units
-55 to 150
-55 to 150
1.5
0.75
0.50
2 (0.07)
Min.
Max.
6 (5)
12 (10)
°C
°C
Conditions
R
thJC
Max. Thermal Resistance Junction
to Case (Per Leg)
R
thJC
Max. Thermal Resistance Junction
to Case (Per Package)
R
thCS
Typical Thermal Resistance, Case
to Heatsink
wt
T
Approximate Weight
Mounting Torque
Marking Device
°C/W DC operation
°C/W DC operation
°C/W Mounting surface , smooth and greased
(only for TO-220)
g (oz.)
Kg-cm
(Ibf-in)
Case style D
2
Pak
Case style TO-262
47CTQ020S
47CTQ020-1
2
www.irf.com
47CTQ020SPbF, 47CTQ020-1PbF
Bulletin PD-21038 rev. A 07/06
1000
1000
T
J
= 150°C
Reverse Current - I
R
(mA)
100
125°C
100°C
75°C
1
50°C
25°C
10
Instantaneous Forward Current - I
F
(A)
100
0.1
0.01
0
4
8
12
16
20
Reverse Voltage - V
R
(V)
T = 150°C
J
T = 125°C
J
10
Junc tion Capa citance - C
T
(pF
)
10000
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
T = 25°C
J
T
J
= 25°C
1
1000
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0
2
4
6
8 10 12 14 16 18 20 22
Forward Voltage Drop - V
FM
(V)
Reverse Voltage - V (V)
R
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
10
T
hermal Impedance Z
thJC
(°C/ W)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
1
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
P
DM
0.1
Notes:
S
ingle Pulse
(T
hermal Resistance)
0.01
0.00001
0.0001
0.001
0.01
0.1
t1
t2
1. Duty fac tor D = t 1/ t 2
2. Peak T = P
DM
x Z
thJC
+ T
C
J
1
10
100
t 1 , Rectangular Pulse Duration (S
econds)
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
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3
47CTQ020SPbF, 47CTQ020-1PbF
Bulletin PD-21038 rev. A 07/06
160
Allowable Case T
emperature - (°C)
12
Average Power Loss - (Watts)
10
8
6
4
2
0
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
RMSLimit
DC
150
DC
140
130
120
110
100
see note (2)
S
quare wave (D = 0.50)
10V applied
90
0
5
10
15
20
25
30
0
5
10
15
20
25
30
Average Forward Current - I
F(AV)
(A)
Average Forward Current - I
F(AV)
(A)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Non-Repetitive S
urge Current - I
FS
(A)
M
1000
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
At Any R
ated Load Condition
And With Rated V
RRM
Applied
Following S
urge
100
10
100
1000
10000
S
quare Wave Pulse Duration - t p (microsec)
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
L
HIGH-S
PEED
S CH
WIT
FREE-WHEEL
DIODE
40HF
L40S
02
+
DUT
IR P460
F
R = 25 ohm
g
Vd = 25 Volt
CURR
ENT
MONIT
OR
Fig. 8 - Unclamped Inductive Test Circuit
(2)
Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 10 V
4
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47CTQ020SPbF, 47CTQ020-1PbF
Bulletin PD-21038 rev. A 07/06
Outlines Table
Conform to JEDEC outline D
2
Pak (SMD-220)
Dimensions in millimeters and (inches)
Modified JEDEC outline TO-262
Dimensions in millimeters and (inches)
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5
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