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MBRS1540T3
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4
Figure 7. Capacitance Figure 8. Typical Operating Temperature Derating*
Figure 9. Thermal Response — Junction to Case
Figure 10. Thermal Response — Junction to Ambient
5.0 10 20 25 35 40 30 3530
5.0 10 2015
0
VR, REVERSE VOLTAGE (VOLTS)
1000
100
10
VR, DC REVERSE VOLTAGE (VOLTS)
25 40
65
0
105
85
75
C, CAPACITANCE (pF)
T
15
95
115
125
, DERATED OPERATING TEMPERATURE ( C)
J
°
* Reverse power dissipation and the possibility of thermal runaway must be considered when operating this device under any re-
verse voltage conditions. Calculations of TJ
therefore must include forward and reverse power effects. The allowable operating
TJ
may be calculated from the equation: T
J
= T
Jmax
? r(t)(Pf + Pr) where
r(t) = thermal impedance under given conditions,
Pf = forward power dissipation, and
Pr = reverse power dissipation
This graph displays the derated allowable TJ
due to reverse bias under DC conditions only and is calculated as T
J
= T
Jmax
? r(t)Pr
,
where r(t) = Rthja. For other power applications further calculations must be performed.
Rtja
= 24
°C/W
43°C/W
63°C/W
80°C/W
93°C/W
TJ
= 25
°C
0.1
0.00001
t, TIME (s)
1.0E+00
1.0E?01
1.0E?02
1.0E?03
1.0E?04
R
0.0001 0.001 0.01
, TRANSIENT THERMAL RESISTANCE (NORMALIZED)
T
1.0
10 100 1000
50%
20%
10%
5.0%
2.0%
1.0%
Rtjl(t)
= R
tjl*r(t)
0.1
0.00001
t, TIME (s)
1.0E+00
1.0E?01
1.0E?02
1.0E?03
1.0E?04
0.0001 0.001 0.01
1.0 10 100 1000
50%
20%
10%
5.0%
2.0%
1.0%
Rtjl(t)
= R
tjl*r(t)
R , TRANSIENT THERMAL RESISTANCE (NORMALIZED)
T
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