[SI-LIST] Re: ESD protectioin at a Digital Input
- From: "Vivekkumar M-ERS,HCLTech" <Vivekkumarm@xxxxxx>
- To: Arun Kumar P N <arun@xxxxxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 9 Dec 2009 20:29:30 +0530
Arun Kumar,
Clamping voltage of an ESD should be closely related to the voltage max the pin
of the IC can withstand. Even though the IC supports 1KV ESD protection, check
with the manufacturer about the max voltage the pins of the IC can withstand.
Say manufacturer suggests 10V. Then at max you can have 15V as clamping voltage.
The danger of having 200V voltage as clamping voltage is that when a large
surge occurs, the IC is subjected to this much voltage and it may damage the IC.
ESD diodes, another the important factor we need to consider is how much
energy(power dissipation in wattage) it can withstand. This is based on the
open and short circuit voltages and were your end equipment is placed.
Find attached app note from semtech.
http://www.semtech.com/images/datasheet/transient_immunity_standards_iec_61000-4-x.pdf
Regards
Vivek
________________________________________
From: si-list-bounce@xxxxxxxxxxxxx [si-list-bounce@xxxxxxxxxxxxx] On Behalf Of
Arun Kumar P N [arun@xxxxxxxxxxxxxxxx]
Sent: Wednesday, December 09, 2009 4:16 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ESD protectioin at a Digital Input
Hi All,
I'm checking for ESD protection at a Digital Input pin.
A Switch is connected to a Schmitt Buffer. The Schmitt buffer is ESD rated
for 1000V HBM
I'm planning to put an external suppressor for IEC levels, on the PCB
My understanding is the clamping voltage should be less than the max
withstand capability of the pin to be protected.
Since it has internal protection of 1000V, does that mean I can put a
suppressor with a clamping voltage of say 200V?
Or should I use an ESD suppressor with a clamping voltage well below 10V?
Regards
Kumar
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