[SI-LIST] Re: What is the clamp voltage of ESD protection device
- From: Ram Chundru <rchundru_umr@xxxxxxxxx>
- To: "zhenwwan@xxxxxxxxx" <zhenwwan@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Mon, 3 Dec 2012 10:28:21 -0800 (PST)
Hi Jason,
There is no standard way of specifying the clamp voltage for TVS devices based
on the IEC61000-4-2 ESD pulse. There is a standard definition based on the
IEC61000-4-5 lightning surge pulse but that does not mean much for an ESD
protection component. Using the ESD pulse is a fairly recent trend and some TVS
manufacturers specify the initial spike while others specify the second hump
(or the voltage at 30 ns). In reality you need to look at the whole clamping
voltage waveform and consider both the initial spike and the plateau. The
initial spike represents high current that can cause CDM-type failures and the
plateau represents high energy that can cause HBM-type failures to the
protected IC.
Thanks,
Ram
________________________________
From: Zhenwei Wang (zhenwwan) <zhenwwan@xxxxxxxxx>
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Sent: Friday, November 9, 2012 1:57 AM
Subject: [SI-LIST] What is the clamp voltage of ESD protection device
Hi,
Could anyone tell me what is the exactly definition for clamp voltage
of a TVS? Based on IEC61000-4-2, is it peak value or the voltage on 30ns(half
peak value)? Thanks!
BR
Zhenwei(Jason) Wang
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