SCHOTTKY RECTIFIER
20 Amps
20L15T
20L15TS
Bulletin PD-20577 rev. D 08/01
1
www.irf.com
I
F(AV)
Rectangular
20
A
waveform
V
RRM
15
V
I
FSM
@ tp = 5 s sine
700
A
V
F
@
19 Apk, T
J
=125C
0.25
V
( Typical)
T
J
range
- 55 to 125
C
Characteristics
Values
Units
Major Ratings and Characteristics
The Schottky rectifier module has been optimized for ultra low
forward voltage drop specifically for the OR-ing of parallel power
supplies. The proprietary barrier technology allows for reliable
operation up to 125 C junction temperature. Typical
applications are in parallel switching power supplies,
converters, reverse battery protection, and redundant power
subsystems.
125C T
J
operation (V
R
< 5V)
Single diode configuration
Optimized for OR-ing applications
Ultra low forward voltage drop
Guard ring for enhanced ruggedness and long term
reliability
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Description/Features
20L15T
Case Styles
TO-220AC
D
2
PAK
20L15TS
Anode
1
3
Cathode
Base
Cathode
Anode
1
3
Base
Cathode
2
N/C
20L15T, 20L15TS
Bulletin PD-20577 rev. D 08/01
2
www.irf.com
I
F(AV)
Max. Average Forward Current
20
A
50% duty cycle @ T
C
= 85C, rectangular wave form
* See Fig. 5
I
FSM
Max. Peak One Cycle Non-Repetitive
700
5s Sine or 3s Rect. pulse
Surge Current * See Fig. 7
330
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
10
mJ
T
J
= 25 C, I
AS
= 2 Amps, L = 6 mH
I
AR
Repetitive Avalanche Current
2
A
Current decaying linearly to zero in 1 sec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
T
J
Max. Junction Temperature Range
-55 to 125
C
T
stg
Max. Storage Temperature Range
-55 to 150
C
R
thJC
Max. Thermal Resistance
1.5
C/W DC operation
* See Fig. 4
Junction to Case
R
thCS
Typical Thermal Resistance
0.50
C/W Mounting surface , smooth and greased
Case to Heatsink
For TO-220
R
thJA
Max. Thermal Resistance
40
C/W DC operation
Junction to Ambient
For D
2
Pak
wt
Approximate Weight
2 (0.07)
g (oz.)
T
Mounting Torque
Min.
6 (5)
Non-lubricated threads
Max.
12 (10)
Part number
Values
V
R
Max. DC Reverse Voltage (V)
@ T
J
= 100 C
V
RWM
Max. Working Peak Reverse Voltage (V) @ T
J
= 100 C
15
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
Parameters
Values
Units
Conditions
Absolute Maximum Ratings
Following any rated
load condition and with
rated V
RRM
applied
Parameters
Values
Units
Conditions
A
Typ. Max.
V
FM
Forward Voltage Drop
-
0.41
V
@ 19A
* See Fig. 1
(1)
-
0.52
V
@ 40A
0.25 0.33
V
@ 19A
0.37 0.50
V
@ 40A
I
RM
Reverse Leakage Current
-
10
mA
T
J
= 25 C
* See Fig. 2
(1)
-
600
mA
T
J
= 100 C
V
F(TO)
Threshold Voltage
0.182
V
T
J
=
T
J
max.
r
t
Forward Slope Resistance
7.6
m
C
T
Max. Junction Capacitance
-
2000
pF
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25C
L
S
Typical Series Inductance
8
-
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
= 25 C
T
J
= 125 C
V
R
= rated V
R
Parameters
Values
Units
Conditions
(1) Pulse Width < 300s, Duty Cycle <2%
Voltage Ratings
Electrical Specifications
20L15T, 20L15TS
Bulletin PD-20577 rev. D 08/01
3
www.irf.com
Fig. 2 - Typical Values of Reverse Current
Vs. Reverse Voltage
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 4 - Maximum Thermal Impedance Z
thJC
Characteristics
Fig. 1 - Maximum Forward Voltage Drop Characteristics
1
1 0
1 0 0
1 00 0
0
0 .2
0 .4
0.6
0.8
1
1 .2
1.4
1 .6
F
FM
Forw a rd V olta g e D rop - V (V )
I
n
s
t
an
t
a
n
e
o
u
s
F
o
r
w
ar
d
C
u
r
r
e
n
t
-
I
(
A
)
T = 12 5 C
T = 7 5 C
T = 2 5 C
J
J
J
0 .1
1
10
1 0 0
10 0 0
0
3
6
9
12
15
R
R
75 C
50 C
25 C
Re
v
e
r
s
e C
u
r
r
e
n
t
-
I
(
m
A
)
Re ve rse V oltag e - V (V )
T = 100 C
J
1 0 0
1 0 00
1 00 0 0
0
5
10
1 5
2 0
R
T
J
u
n
c
ti
o
n
C
a
p
a
c
i
ta
n
c
e
-
C
(
p
F
)
Re ve rse V olta g e - V (V )
T = 2 5 C
J
0 .0 1
0 .1
1
10
0.00 00 1
0 .00 0 1
0 .0 01
0.0 1
0 .1
1
10
100
th
J
C
t , R e c tan g ular Pu lse D ura tio n (Sec o nd s)
Sin gle Pu lse
(Therm a l R esista n c e)
1
Th
e
r
m
a
l
I
m
p
e
d
a
n
c
e
Z
(
C
/
W
)
N otes:
1. D uty fac tor D = t / t
2. Pe ak T = P x Z + T
1
2
J
thJ C
C
D M
D = 0 .75
D = 0 .50
D = 0 .33
D = 0 .25
D = 0 .2 0
2
t
1
t
P
D M
20L15T, 20L15TS
Bulletin PD-20577 rev. D 08/01
4
www.irf.com
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 5 - Maximum Allowable Case Temperature
Vs. Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
FR EE-W HE EL
D IO D E
40H FL40S02
C UR RE N T
M O N ITO R
H IG H -SPE ED
SW ITC H
IRFP460
L
D UT
Rg = 25 ohm
V d = 25 V olt
+
0
2
4
6
8
10
12
14
0
5
10
15
2 0
2 5
3 0
D C
A
v
e
r
ag
e
P
o
w
e
r
L
o
s
s
-
(
W
at
t
s
)
F(A V)
RM S Lim it
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
A ve ra g e Forw a rd C urre n t - I (A)
100
1000
10
100
1000
10000
FS
M
N
o
n
-
R
e
p
e
ti
ti
v
e
S
u
r
g
e
C
u
r
r
e
n
t -
I
(
A
)
p
A t A n y Rate d Load C on d ition
A n d W ith Rate d V Ap plie d
Follow in g Surg e
RRM
Sq uare W ave Pulse D uration - t (m ic rose c )
7 0
7 5
8 0
8 5
9 0
9 5
1 00
0
4
8
1 2
16
20
24
A
l
l
o
w
a
b
l
e C
a
s
e
T
e
m
p
e
r
a
t
u
r
e -
(
C
)
F(A V)
se e n o te ( 2)
A ve ra g e Forw ard C urren t - I (A)
Squa re w ave (D = 0.50)
(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
20L15T, 20L15TS
Bulletin PD-20577 rev. D 08/01
5
www.irf.com
TRR
FEED DIR ECTION
TRL
FEED DIRECTION
10.90 (0.429)
10.70 (0.421)
16.10 (0.634)
15.90 (0.626)
1.75 (0.069)
1.25 (0.049)
1.85 (0.073)
1.65 (0.065)
4.10 (0.161)
3.90 (0.153)
1.60 (0.063)
1.50 (0.059)
DIA.
1.60 (0.063)
1.50 (0.059)
DIA.
11.60 (0.457)
11.40 (0.449)
15.42 (0.609)
15.22 (0.601)
4.72 (0.186)
4.52 (0.178)
24.30 (0.957)
23.90 (0.941)
0.368 (0.0145)
0.342 (0.0135)
360 (14.173)
DIA. MAX.
26.40 (1.039)
24.40 (0.961)
13.50 (0.532)
12.80 (0.504)DIA.
60 (2.362)
D IA . MIN .
SMD-220 Tape & Reel
When ordering, indicate the part
number, part orientation, and the
quantity. Quantities are in multiples
of 800 pieces per reel for both
TRL and TRR.
10.16 (0.40)
REF.
8.89 (0.35)
4.57 (0.18)
4.32 (0.17)
0.61 (0.02) MAX.
5.08 (0.20) REF.
1.32 (0.05)
1.22 (0.05)
1
3
6.47 (0.25)
6.18 (0.24)
93
REF.
2.61 (0.10)
2.32 (0.09)
5.28 (0.21)
4.78 (0.19)
4.69 (0.18)
4.20 (0.16)
0.55 (0.02)
0.46 (0.02)
14.73 (0.58)
15.49 (0.61)
1.40 (0.055)
1.14 (0.045)
3X
0.93 (0.37)
0.69 (0.27)
2X
11.43 (0.45)
17.78 (0.70)
8.89 (0.35)
3.81 (0.15)
2.08 (0.08)
2X
2.54 (0.10)
2X
MINIMUM RECOMMENDED FOOTPRINT
2
Dimensions in millimeters and (inches)
Tape & Reel Information
Outline Table
Dimensions in millimeters and (inches)
Conform to JEDEC outline D
2
Pak (SMD-220)
Anode
1
3
Base
Cathode
2
N/C
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