[volt-nuts] 3458A NVRAM

David C. Partridge david.partridge at perdrix.co.uk
Thu Dec 21 13:42:41 EST 2017

I purchased an FM16W08 (for the CAL RAM) and a pair of FM18W08 for the user data RAMs.  I'll use 28 way SIOC to DIP adapter PCBs and will wire up the FM16W08 so it looks like a DS1220Y.

-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of Dan Kemppainen
Sent: 19 December 2017 19:15
To: volt-nuts at febo.com
Subject: Re: [volt-nuts] 3458A NVRAM


Ramtron was acquired by Cypress Semiconductor. I've had trouble finding some FRAM parts, but that may be changing as Cypress scales up production.

Also, watch out for fraudulent parts on ebay. I've ended up buying a couple things that were bad, although not ramtron parts.

Anyway, Keep us posted on the FRAM upgrade. I'm curious how it works out.


> I'm looking at the A5 board in my 3458A.
> The DS1220Y and the two DS1230Y NVRAMs have 1997 dates, so should 
> likely be replaced.  I *think* the Ramtron FM1608-120-P is a direct "drop-in"
> replacement in this application for the DS1230Y.  Is that right?  If 
> so I'll get some in from eBay.
> Is there an FRAM direct replacement for the DS1220Y-150? Or should I 
> use a
> FM16W08 on a 28 way SOIC to DIP adapter as per 
> <https://xdevs.com/fix/hp3458a_u4/#fram>
> Thanks
> Dave
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