A pulse of 4500 V is discharged from a person into a pen junction. The junction area is $5 × 10^{-7} cm^2$ and the resistance is 20Ω . Assume that the voltage across the device is negligible compared with that of the ESD pulse.
a. Over what time span does the discharge occur?

Question

A pulse of 4500 V is discharged from a person into a pen junction. The junction area is [latex]5 × 10^{-7} cm^2[/latex] and the resistance is 20Ω . Assume that the voltage across the device is negligible compared with that of the ESD pulse.
a. Over what time span does the discharge occur?

b. What is the maximum current?

c. Calculate the power density discharged through the diode.

Accepted Answer

a. For the human body model the time constant is [latex] au =C_{B}(R_{T}+R_{B})[/latex] .Substituting, [latex] au =100 imes10^{-12}(20+1500)=0.152\mu s[/latex]. Therefore,[latex]5 au =0.76\mu s[/latex].

b. Ohm’s law simply states that [latex]i_{o}=V_{HBM}/(R_{T}+R_{B})=4500/(20+1500)=2.96A[/latex]

c. The power density is [latex]

/A_{o},orR_{T} \ i_{o}^{2}/(10A_{o})[/latex].Substituting, [latex]

/A_{o}=20(2.96)^2/(10(5 imes10^{-7}))=35MW/cm^{2}[/latex]

Question 6.1: A pulse of 4500 V is discharged from a person into a pen jun...

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