1N5818 查看數據表（PDF） - Motorola => Freescale
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1N5818 Datasheet PDF : 6 Pages
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1N5817 1N5818 1N5819
NOTE 3 — THERMAL CIRCUIT MODEL
(For heat conduction through the leads)
RθS(A) RθL(A) RθJ(A)
RθJ(K) RθL(K) RθS(K)
TA(A)
TL(A)
TC(A)
PD
TJ
TC(K)
TA(K)
TL(K)
Use of the above model permits junction to lead thermal resistance
for any mounting configuration to be found. For a given total lead
length, lowest values occur when one side of the rectifier is brought
as close as possible to the heatsink. Terms in the model signify:
TA = Ambient Temperature TC = Case Temperature
TL = Lead Temperature
TJ = Junction Temperature
RθS = Thermal Resistance, Heatsink to Ambient
RθL = Thermal Resistance, Lead to Heatsink
RθJ = Thermal Resistance, Junction to Case
PD = Power Dissipation
(Subscripts A and K refer to anode and cathode sides, respectively.)
Values for thermal resistance components are:
RθL = 100°C/W/in typically and 120°C/W/in maximum
RθJ = 36°C/W typically and 46°C/W maximum.
20
10
7.0
5.0
TC = 100°C
3.0
2.0
25°C
1.0
0.7
0.5
0.3
0.2
0.1
0.07
0.05
0.03
0.02
0.1
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
vF, INSTANTANEOUS FORWARD VOLTAGE (VOLTS)
Figure 7. Typical Forward Voltage
125
115
TL = 70°C
f = 60 Hz
105
1 Cycle
95
85
Surge Applied at
Rated Load Conditions
75
1.0
2.0 3.0 5.0 7.0 10
20 30
NUMBER OF CYCLES
40 70 100
Figure 8. Maximum Non–Repetitive Surge Current
30
20
TJ = 125°C
15
5.0
100°C
3.0
2.0
75°C
1.0
0.5
0.3
25°C
0.2
0.1
1N5817
0.05
1N5818
1N5819
0.03
0 4.0 8.0 12 16 20 24 28 32 36 40
VR, REVERSE VOLTAGE (VOLTS)
Figure 9. Typical Reverse Current
4
Rectifier Device Data
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