1N5817, 1N5818, 1N5819
Low drop power Schottky rectifier
Features
Very small conduction losses
Negligible switching losses
A
Extremely fast switching
Low forward voltage drop
K
Avalanche capability specified
DO-41
Description
Axial Power Schottky rectifier suited for Switch
Table 1. Device summary
Mode Power Supplies and high frequency DC to
Symbol Value Unit
DC converters. Packaged in DO-41 these devices
are intended for use in low voltage, high
I 1A
F(AV)
frequency inverters, free wheeling, polarity
V 40 V
protection and small battery chargers.
RRM
T 150 C
j
V (max) 0.45 V
F
July 2011 Doc ID 6262 Rev 5 1/7
www.st.com 7Characteristics 1N5817, 1N5818, 1N5819
1 Characteristics
Table 2. Absolute ratings (limiting values)
Value
Symbol Parameter Unit
1N5817 1N5818 1N5819
V Repetitive peak reverse voltage 20 30 40 V
RRM
I Forward rms current 10 A
F(RMS)
Average forward
I T = 125 C, = 0.5 1 A
F(AV) L
current
Surge non repetitive
I t = 10 ms Sinusoidal 25 A
FSM p
forward current
Repetitive peak
P t = 1 s, T = 25 C 1200 1200 900 W
ARM p j
avalanche power
T Storage temperature range -65 to + 150 C
stg
(1)
T Maximum operating junction temperature 150 C
j
dV/dt Critical rate of rise of reverse voltage 10000 V/s
1
dPtot
<
1. condition to avoid thermal runaway for a diode on its own heatsink.
Rth(j-a)
dTj
Table 3. Thermal resistances
Symbol Parameter Value Unit
R Junction to ambient Lead length = 10 mm 100 C/W
th (j-a)
R Junction to lead Lead length = 10 mm 45 C/W
th (j-l)
Table 4. Static electrical characteristics
Symbol Parameter Tests conditions 1N5817 1N5818 1N5819 Unit
T = 25 C 0.5 0.5 0.5 mA
j
Reverse leakage
(1)
I V = V
R R RRM
current
T = 100 C 10 10 10 mA
j
T = 25 C I = 1 A 0.45 0.50 0.55 V
j F
(1)
V Forward voltage drop
F
T = 25 C I = 3 A 0.75 0.80 0.85 V
j F
1. Pulse test : t = 380 s, < 2%
p
To evaluate the conduction losses use the following equations :
2
P = 0.3 x I + 0.090 I for 1N5817 / 1N5818
F(AV) F (RMS )
2
P = 0.3 x I + 0.150 I for 1N5819
F(AV) F (RMS )
2/7 Doc ID 6262 Rev 5