Rectifier Diode Types W8405Z#100 to W8405Z#140

Data Sheet. Types W8405Z#100 to W8405Z#140 Issue 2

Page 5 of 10

July, 2014

5.3 D.C. Thermal Impedance Calculation































n

p

p

t

p

t

p

e

r

r

1

1



Where p = 1 to n, n is the number of terms in the series and:

t = Duration of heating pulse in seconds.

r

The coefficients for this device are shown in the tables below:

D.C. Double Side Cooled

Term

1

2

3

4

0.01551



p

10.04275

1.783567

0.2231307

D.C. Double Side Cooled

Term

1

2

3

4

5



p

1.785337

0.34595

0.099651

0.014214