SCHOTTKY RECTIFIER
40 Amp
42CTQ030L
Preliminary Data Sheet PD-20573 11/98
1
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I
F(AV)
Rectangular
40
A
waveform
V
RRM
30
V
I
FSM
@ tp = 5 s sine
1100
A
V
F
@
20 Apk, T
J
= 125C
0.38
V
(per leg)
T
J
range
- 55 to 150
C
Characteristics
42CTQ...L Units
Major Ratings and Characteristics
Description/Features
The 42CTQ030L center tap Schottky rectifier has been opti-
mized for very low forward voltage drop, with moderate
leakage. The proprietary barrier technology allows for reliable
operation up to 150 C junction temperature. Typical applica-
tions are in switching power supplies, converters, free-wheel-
ing diodes, and reverse battery protection.
150 C T
J
operation
Center tap TO-262 package
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Very low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
TO-262
2
BASE
COMM ON
CATHODE
1
2
3
ANODE
COMM ON
CATHODE
ANODE
1
2
Modified JEDEC outline TO-262
Dimensions in millimeters and inches
42CTQ030L
www.irf.com
Preliminary Data Sheet PD-20573 11/98
2
Part number
42CTQ030L
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
Voltage Ratings
30
V
FM
Max. Forward Voltage Drop
0.48
V
@ 20A
(Per Leg) * See Fig. 1
(1)
0.57
V
@ 40A
0.38
V
@ 20A
0.51
V
@ 40A
I
RM
Max. Reverse Leakage Current
3
mA
T
J
= 25 C
(Per Leg) * See Fig. 2
(1)
183
mA
T
J
= 125 C
V
F(TO)
Threshold Voltage
0.22
V
T
J
= T
J
max.
r
t
Forward Slope Resistance
6.76
m
C
T
Max. Junction Capacitance (Per Leg)
2840
pF
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance (Per Leg)
8.0
nH
Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change
10,000
V/ s
(Rated V
R
)
T
J
Max. Junction Temperature Range
-55 to 150
C
T
stg
Max. Storage Temperature Range
-55 to 150
C
R
thJC
Max. Thermal Resistance Junction
2.0
C/W
DC operation
to Case (Per Leg) * See Fig. 4
R
thJC
Max. Thermal Resistance Junction
1.0
C/W
DC operation
to Case (Per Package)
R
thCS
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)
Case Style
TO-262
Modified JEDEC
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
T
J
= 25 C
T
J
= 125 C
Electrical Specifications
(1) Pulse Width < 300s, Duty Cycle <2%
V
R
= rated V
R
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
Parameters
42CTQ..L Units
Conditions
I
F(AV)
Max. Average Forward
(Per Leg)
20
A
50% duty cycle @ T
C
= 121C, rectangular wave form
Current
* See Fig. 5
(Per Device)
40
I
FSM
Max. Peak One Cycle Non-Repetitive
1100
5s Sine or 3s Rect. pulse
Surge Current (Per Leg) * See Fig. 7
360
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
13
mJ
T
J
= 25 C, I
AS
= 3 Amps, L = 2.90 mH
(Per Leg)
I
AR
Repetitive Avalanche Current
3
A
Current decaying linearly to zero in 1 sec
(Per Leg)
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
A
Parameters
42CTQ..L Units
Conditions
Parameters
42CTQ..L Units
Conditions
42CTQ030L
Preliminary Data Sheet PD-20573 11/98
www.irf.com
3
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 Z
thJC
Characteristics (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
0.01
0.1
1
10
0.00001
0.0001
0.001
0.01
0.1
1
10
100
th
J
C
t , Rectangular Pulse Duration (Seconds)
Single Pulse
(Thermal Resistance)
1
Th
e
r
m
a
l
I
m
p
e
d
a
n
c
e
Z
(
C
/
W
)
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
J
DM
1
2
thJC
C
2
t
1
t
P
DM
1
10
100
1000
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
I
n
st
a
n
t
a
n
e
o
u
s F
o
r
w
a
r
d
C
u
r
r
e
n
t
-
I
(
A
)
T = 150C
T = 125C
T = 25C
J
J
J
F
F M
Forward Voltage Drop - V (V)
0.01
0.1
1
10
100
1000
0
5
10
15
20
25
30
R
R
125C
100C
75C
50C
25C
Reverse Voltage - V (V)
R
e
v
e
rs
e
C
u
rr
e
n
t
-
I
(
m
A
)
T = 150C
J
100
1000
10000
0
5
10
15
20
25
30
35
T = 25C
J
R
T
Reverse Voltage - V (V)
J
u
n
c
ti
o
n
C
a
p
a
c
i
ta
n
c
e
-
C
(
p
F
)
42CTQ030L
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Preliminary Data Sheet PD-20573 11/98
4
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)
FREE-WHEEL
DIODE
40HFL40S02
CURRENT
MONITOR
HIGH-SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm
Vd = 25 Volt
+
100
110
120
130
140
150
0
5
10
15
20
25
30
DC
A
l
lo
w
a
b
l
e C
a
s
e
Te
m
p
e
r
a
t
u
r
e -
(
C
)
F(AV)
see note (2)
Square wave (D = 0.50)
80% Rated V applied
R
Average Forward Current - I (A)
0
4
8
12
16
0
5
10
15
20
25
30
DC
A
v
e
r
ag
e
P
o
we
r
Lo
ss -
(
W
at
t
s
)
F(AV)
RMS Limit
Average Forward Current - I (A)
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
100
1000
10
100
1000
10000
FS
M
N
o
n
-
R
e
p
e
t
i
t
i
v
e
Su
r
g
e
C
u
r
r
e
n
t
-
I
(
A
)
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
p
Square Wave Pulse Duration - t (microsec)
(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
= 80% rated V
R
42CTQ030L
Preliminary Data Sheet PD-20573 11/98
www.irf.com
5
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http://www.irf.com
Fax-On-Demand: +44 1883 733420 Data and specifications subject to change without notice.
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