SS22 datasheet(4/6 Pages) ONSEMI

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SS22, SS24

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Figure 7. Capacitance

Figure 8. Typical Operating Temperature Derating*

Figure 9. Thermal Response — Junction to Case

Figure 10. Thermal Response — Junction to Ambient

VR, REVERSE VOLTAGE (VOLTS)

1000

100

VR, DC REVERSE VOLTAGE (VOLTS)

105

5.0

115

125

* 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.

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

0.0001

0.001

0.01

1.0

100

1000

50%

20%

10%

5.0%

2.0%

1.0%

Rtjl(t) = Rtjl*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

100

1000

50%

20%

10%

5.0%

2.0%

1.0%

Rtjl(t) = Rtjl*r(t)

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