MBRS2040LT3 Datasheet, PDF (4/6 Pages) Motorola, Inc – Surface Mount Schottky Power Rectifier(SMB Power Surface Mount Package)

MBRS2040LT3
1000
125
115
TJ = 25°C
105
Rtja = 22.5°C/W
100
10
0 5.0 10 15 20 25 30 35 40
VR, REVERSE VOLTAGE (VOLTS)
Figure 7. Capacitance
95
42°C/W
85
61°C/W
78°C/W
75
92°C/W
65
0 5.0 10 15 20 25 30 35 40
VR, DC REVERSE VOLTAGE (VOLTS)
Figure 8. Typical Operating Temperature Derating*
* 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: TJ = TJmax − 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 TJ = TJmax − r(t)Pr,
where r(t) = Rthja. For other power applications further calculations must be performed.
1.0
50%
20%
10%
0.1
5.0%
2.0%
0.01 1.0%
0.001
0.00001
1.0
50%
20%
0.1
10%
5.0%
2.0%
0.01
1.0%
0.001
0.00001
Rtjl(t) = Rtjl*r(t)
0.0001
0.001
0.01
0.1
1.0
T, TIME (s)
Figure 9. Thermal Response Junction to Lead
0.0001
Rtjl(t) = Rtjl*r(t)
0.001
0.01
0.1
1.0
10
T, TIME (s)
Figure 10. Thermal Response Junction to Ambient
10
100
100
1,000
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