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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: DC relay latching voltage
Date: Sun, 25 Aug 2024 11:52:11 -0700
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On 8/25/2024 8:30 AM, John Robertson wrote:
>> <https://www.te.com/commerce/DocumentDelivery/DDEController? 
>> Action=srchrtrv&DocNm=13C3311_AppNote&DocType=CS&DocLang=EN>
> 
> Is there an index to these useful Application Notes?

No idea.  I'm just leaning on lessons learned decades ago and searching for
documents that would likely confirm those issues.

> I only found this when I searched for "application notes":
> 
> https://www.te.com/en/products/relays-and-contactors/relays/intersection/application-notes.html
> 
> And did you happen to write some of them by chance?

No.  I don't publish anything "for general consumption"; only specific
issues for specific audiences.  Not enough time in the day to do the
things I *want* to do while considering "optional" efforts.

Don't kill yourself worrying about this sort of thing for a pin table.
You're likely not as concerned with durability.  The board's already
(likely) designed.  And, it's already got an established (tolerable?)
level of EMI.

Rather, it should be seen as a counter to the "old saw" that you *just* use
a recirculating diode without considering the consequences.  Just like
considering how to *drive* the coil based on how it will be used.

[Remember the "pull in" coils and "end of stroke" switches on flipper
solenoids?]