SCHOTTKY RECTIFIER 20 Amps
20L15T
20L15TS
Bulletin PD-20577 rev. D 08/01
1www.irf.com
I
F(AV)
Rectangular 20 A
waveform
V
RRM
15 V
I
FSM
@ tp = 5 µs sine 700 A
V
F
@
19 Apk, T
J
=125°C 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.
125°C 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
athode
Base
Cathode
Anode
1
3
Base
Cathode
2
/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
= 85°C, rectangular wave form
* See Fig. 5
I
FSM
Max. Peak One Cycle Non-Repetitive 700 5µs Sine or 3µs 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 µsec
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 mΩ
C
T
Max. Junction Capacitance - 2000 pF V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25°C
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/ µs
(Rated V
R
)
T
J
= 25 °C
T
J
= 125 °C
V
R
= rated V
R
Parameters Values Units Conditions
(1) Pulse Width < 300µs, 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
10
100
1000
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
F
FM
Forward Voltage Drop - V (V)
Instantaneous Forward Current - I (A)
T = 125 C
T = 75 C
T = 25 C
J
J
J
0.1
1
10
100
1000
03691215
R
R
75 C
50 C
25 C
Reverse Current - I (mA)
Reverse Voltage - V (V)
T = 100 C
J
100
1000
10000
0 5 10 15 20
R
T
Junction Capacitance - C (pF)
Reverse Voltage - V (V)
T = 25 C
J
0.01
0.1
1
10
0.00001 0.0001 0.001 0.01 0.1 1 10 100
thJC
t , Rectangular Pulse Duration (Seconds)
Single Pulse
(Thermal Resistance)
1
Thermal Impedance Z ( C/W )
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
1
2
J
thJC
C
DM
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
2
t
1
t
P
DM
