Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How thinner the epitaxial on heavily doped substrate the better fro latch-up?

Status
Not open for further replies.

sathi.ec

Member level 1
Joined
Sep 29, 2005
Messages
41
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
Bangalore
Activity points
1,606
Can someone explain me
Thinner the epitaxial on heavily doped substrate is better for LATCH-UP? HOW?
 

electronrancher

Advanced Member level 1
Joined
Mar 24, 2002
Messages
447
Helped
46
Reputation
92
Reaction score
11
Trophy points
1,298
Activity points
6,935
Thin Epitaxial Layer

Latchup is often triggered by current injected accidentally from a well. If the current is high enough to give a 0.5-0.6v drop between the source and the closest pickup, it can begin turning on parasitic bjt.

Thinner epi will have a lower resistance path to substrate and therefore can tolerate more current before the resistive drop reaches 0.6v turn-on of the "base" of the parasitic bjt.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top