# Chapter 15 , BJT Characteristics¶

## Example 15.1 , Page Number 331¶

In [1]:
import math

#Variables

PDmax = 500                            #Maximum Power dissipation at 25 degree Celsius (in milli-watt)
DF = 2.28                              #derating factor (in milli-watt per degree Celsius)
T = 70                                 #Temperaure (in degree Celsius)

#Calculation

PDmax70 = PDmax - DF * (T - 25)        #Maximum Power dissipation at 70 degree Celsius (in milli-watt)

#Result

print "Maximum power dissipation at 70 degree Celsius is ",round(PDmax70)," mW."

Maximum power dissipation at 70 degree Celsius is  397.0  mW.