tsmc epi layer option, which epi is better to prevent latchu

[lionking819]

epi resistance

I was told by TSMC person that they have two epi layer option to select
1. normal epi (resistance 6-8Ohm)
2. special epi (no doping, really high resistance and thinner than normal epi)
does anybody use the special epi layer before?
to prevent latchup, which one is better?

thanks

 

[erikl]

Re: tsmc epi layer option

... to prevent latchup, which one is better?

I'm not absolutely sure, but from physical reason the lower-resistance epi should be better. The higher-resistance epi layer is for HV applications ( > 5V ).

 

[lionking819]

Re: tsmc epi layer option

erikl

thanks for the info.

 

[jian1712]

tsmc epi layer option

lower resistance epi is better to prevent latch-up

 

[deepak242003]

tsmc epi layer option

erik is correct.. because lower the resistance more will be current required to trigger the parasitic SCR......