SCHOTTKY RECTIFIER
20A, 45V
20CLQ045
Major Ratings and Characteristics
Description/Features
12/03/03
CASE STYLE
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1
Characteristics
20CLQ045 Units
I
F(AV)
Rectangular
20
A
waveform
V
RRM
(Per Leg)
45
V
I
FSM
@ tp = 8.3ms half-sine
250
A
(Per Leg)
V
F
@ 10Apk, T
J
=125C
0.48
V
(Per Leg)
T
J
, T
stg
Operating and storage
-55 to 150
C
ANODE COMMON ANODE
CATHODE
1
2
3
HIGH EFFICIENCY SERIES
Case Outline and Dimensions SMD-1
PD -20352F
The 20CLQ045 center tap Schottky rectifier has been
expressly designed to meet the rigorous requirements of
hi-rel environments. It is packaged in the hermetic surface
mount SMD-1 ceramic package. The device's forward
voltage drop and reverse leakage current are optimized for
the lowest power loss and the highest circuit efficiency for
typical high frequency switching power supplies and
resonent power converters. Full MIL-PRF-19500 quality
conformance testing is available on source controlled
drawings to TX, TXV and S levels.
Hermetically Sealed
Center Tap
Low Forward Voltage Drop
High Frequency Operation
Guard Ring for Enhanced Ruggedness and Long
Term Reliability
Surface Mount
Lightweight
(ISOLATED BASE)
20CLQ045
2
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Part number
20CLQ045
V
R
Max. DC Reverse Voltage (V) (Per Leg)
V
RWM
Max. Working Peak Reverse Voltage (V) (Per Leg)
Voltage Ratings
45
Parameters
Limits Units
Conditions
I
F(AV)
Max. Average Forward Current
20
A
50% duty cycle @ T
C
= 100C, rectangular waveform
See Fig. 5
I
FSM
Max. Peak One Cycle Non - Repetitive
250
A
@ t
p
= 8.3 ms half-sine
Surge Current (Per Leg)
Absolute Maximum Ratings
Q
Pulse Width < 300s, Duty Cycle < 2%
Parameters
Limits
Units
Conditions
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
1.67
C/W
DC operation
See Fig. 4
to Case (Per Leg)
R
thJC
Max. Thermal Resistance, Junction
0.83
C/W
DC operation
to Case (Per Package)
wt
Weight (Typical)
2.6 g
Die Size
125X125 mils
Case Style
SMD-1
Thermal-Mechanical Specifications
Parameters
Limits
Units Conditions
V
FM
Max. Forward Voltage Drop
0.57
V
@ 10A
(Per Leg) See Fig. 1
Q
0.69
V
@ 20A
0.48
V
@ 10A
0.61
V
@ 20A
I
RM
Max. Reverse Leakage Current
0.5
mA
T
J
= 25C
V
R
= rated V
R
(Per Leg) See Fig. 2
Q
15
mA
T
J
= 125C
C
T
Max. Junction Capacitance (Per Leg)
900
pF
V
R
= 5V
DC
( 1MHz, 25C )
L
S
Typical Series Inductance (Per Leg)
5.9
nH
Measured from center of cathode pad to center of
anode pad
Electrical Specifications
T
J
= 25C
T
J
=1 25C
20CLQ045
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3
Fig. 2 - Typical Values of Reverse Current
Vs. Reverse Voltage (Per Leg)
Fig. 3 - Typical Junction Capacitance Vs.
Reverse Voltage (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
0 . 0 0 0 1
0 . 0 0 1
0 . 0 1
0 . 1
1
1 0
1 0 0
0
5
1 0
1 5
2 0
2 5
3 0
3 5
4 0
4 5
75C
50C
25C
125C
150C
T = 175C
J
A
20CLQ045
4
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Fig. 5 - Max. Allowable Case Temperature Vs.
Average Forward Current
Fig. 4 - Max. Thermal Impedance Z
thJC
Characteristics (Per Leg)
20CLQ045
R
thJC
(DC) = 0.83C/W
0.01
0.1
1
10
0.00001
0.0001
0.001
0.01
0.1
1
10
Notes:
1. Duty factor D = t / t
2. Peak T = P
x Z
+ T
1
2
J
DM
thJC
C
P
t
t
DM
1
2
t , Rectangular Pulse Duration (sec)
Thermal Response
(Z )
1
thJC
0.01
0.02
0.05
0.10
0.20
D = 0.50
SINGLE PULSE
(THERMAL RESPONSE)
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
IR LEOMINSTER : 205 Crawford St., Leominster, Massachusetts 01453, USA Tel: (978) 534-5776
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information.
Data and specifications subject to change without notice. 12/03
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