Source for SDRAM chips
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Source for SDRAM chips
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Alex Parkinson
Guest
Posted: Fri Dec 24, 2004 10:23 pm    Post subject: Source for SDRAM chips Reply with quote
Does anyone know where small quantities of SDRAM chips (not modules) could be purchased?

Thanks,
Alex Parkinson
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TCS
Guest
Posted: Sat Dec 25, 2004 4:40 am    Post subject: Re: Source for SDRAM chips Reply with quote
On Fri, 24 Dec 2004 12:23:02 -0500, Alex Parkinson <ahparky@ufl.edu> wrote:
Quote:
Does anyone know where small quantities of SDRAM chips (not modules) could be purchased?
yes.
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Earl Bollinger
Guest
Posted: Sat Dec 25, 2004 6:57 am    Post subject: Re: Source for SDRAM chips Reply with quote
www.digikey.com comes to mind.
www.mouser.com
www.jameco.com
sometimes www.allelectronics.com and or www.bgmicro.com have them in too.
www.ebay.com sometimes has the chips for sale or auction too.


"Alex Parkinson" <ahparky@ufl.edu> wrote in message
news:cqhj9k$14jg$2@spnode25.nerdc.ufl.edu...
Quote:
Does anyone know where small quantities of SDRAM chips (not modules) could
be purchased?

Thanks,
Alex Parkinson
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Guest
Posted: Sat Dec 25, 2004 7:27 am    Post subject: Re: Source for SDRAM chips Reply with quote
Are you looking for specific chips, or just any parts in approximately
the right density?

I had big trouble trying to source 1Mx16 SDRAMs for an ARM prototype
run we did about a year ago. I eventually cannibalized SODIMMs :(
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Richard H.
Guest
Posted: Sat Dec 25, 2004 7:56 am    Post subject: Re: Source for SDRAM chips Reply with quote
Alex Parkinson wrote:
Quote:
Does anyone know where small quantities of SDRAM
chips (not modules) could be purchased?

I've been able to source Micron's 256Mbit SDR DRAM from Arrow
electronics on one-off quantities for ~$10 ea. (MT48LC16M16A2TG-7E, the
4Mx16-bit version). They seem to have been on allocation forever, but
in small qty it hasn't been a problem.
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Wim Ton
Guest
Posted: Sat Dec 25, 2004 6:02 pm    Post subject: Re: Source for SDRAM chips Reply with quote
"Alex Parkinson" <ahparky@ufl.edu> wrote in message
news:cqhj9k$14jg$2@spnode25.nerdc.ufl.edu...
Quote:
Does anyone know where small quantities of SDRAM chips (not modules) could
be purchased?


In the UK: Farnell

Wim
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Alex Parkinson
Guest
Posted: Mon Dec 27, 2004 7:34 pm    Post subject: Re: Source for SDRAM chips Reply with quote
Quote:
yes.

Thank you. That was very helpful.
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Alex Parkinson
Guest
Posted: Mon Dec 27, 2004 7:43 pm    Post subject: Re: Source for SDRAM chips Reply with quote
larwe@larwe.com wrote:
Quote:
Are you looking for specific chips, or just any parts in approximately
the right density?

I'm not looking for any particular chips, mainly just anything at about 1M x 8 and up.
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TCS
Guest
Posted: Mon Dec 27, 2004 10:22 pm    Post subject: Re: Source for SDRAM chips Reply with quote
On Mon, 27 Dec 2004 09:43:37 -0500, Alex Parkinson <ahparky@ufl.edu> wrote:
Quote:
larwe@larwe.com wrote:
Are you looking for specific chips, or just any parts in approximately
the right density?

I'm not looking for any particular chips, mainly just anything at about 1M x 8 and up.

what happened when you did web searches?
what did you find with mouser, digikey, and other vendors that you found
from your web search?
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Guest
Posted: Mon Dec 27, 2004 10:44 pm    Post subject: Re: Source for SDRAM chips Reply with quote
No stock, or minimum purchase a waffle, for every single part number I
could find that was compatible with my design. Mostly it was no stock.
I eventually begged some samples out of Micron, I think.
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Alex Parkinson
Guest
Posted: Mon Dec 27, 2004 10:52 pm    Post subject: Re: Source for SDRAM chips Reply with quote
Quote:
what happened when you did web searches?
what did you find with mouser, digikey, and other vendors that you found
from your web search?

I haven't found anything with Digikey, Mouser, AvNet, Future, Allied, Newark, All
Electronics, or BG Micro. So far Arrow, which was suggested by Richard H., seems to be
the only major vendor that sells them in small quantities. I've seen them on eBay
before, but I'd like to find a source that's a little more reliable.
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Richard H.
Guest
Posted: Tue Dec 28, 2004 3:51 am    Post subject: Re: Source for SDRAM chips Reply with quote
Alex Parkinson wrote:
Quote:
I haven't found anything with Digikey, Mouser,
AvNet, Future, Allied, Newark, All Electronics, or
BG Micro. So far Arrow, which was suggested by
Richard H., seems to be the only major vendor that
sells them in small quantities. I've seen them on
eBay before, but I'd like to find a source that's
a little more reliable.

I'm glad that pointer was useful. IIRC, I went about it the reverse
direction - asked the manufacturer who stocks their parts and sells qty
1. In fact, I think I was asking about samples sources. I stopped when
I found the first one, but you might try this with other manufacturers.

I got the sense that DRAM prices are too volatile for most distributors
to stock...

What quantities are you looking for? A TSSOP tray looks to be 108 pcs
(~USD$1000 for 32MB chips) - a bit much for hobby, but maybe not for
short-run production. Distributors might be more willing to broker full
trays.

Also, you might check with smaller shops that make products with similar
parts - they may be willing to sell you loose parts from their
inventory.
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Mike Harrison
Guest
Posted: Tue Dec 28, 2004 5:57 pm    Post subject: Re: Source for SDRAM chips Reply with quote
On Mon, 27 Dec 2004 15:51:45 -0700, "Richard H." <rh86@no.spam> wrote:

Quote:
Alex Parkinson wrote:
I haven't found anything with Digikey, Mouser,
AvNet, Future, Allied, Newark, All Electronics, or
BG Micro. So far Arrow, which was suggested by
Richard H., seems to be the only major vendor that
sells them in small quantities. I've seen them on
eBay before, but I'd like to find a source that's
a little more reliable.

I'm glad that pointer was useful. IIRC, I went about it the reverse
direction - asked the manufacturer who stocks their parts and sells qty
1. In fact, I think I was asking about samples sources. I stopped when
I found the first one, but you might try this with other manufacturers.

I got the sense that DRAM prices are too volatile for most distributors
to stock...

What quantities are you looking for? A TSSOP tray looks to be 108 pcs
(~USD$1000 for 32MB chips) - a bit much for hobby, but maybe not for
short-run production. Distributors might be more willing to broker full
trays.

Also, you might check with smaller shops that make products with similar
parts - they may be willing to sell you loose parts from their
inventory.

I think the main problem is that not many people these days use loose DRAM chips, as modules are so
widely available - for development quantities, it will often be easier and cheaper to strip chips
off a PC memory module where possible.
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Guest
Posted: Tue Dec 28, 2004 6:35 pm    Post subject: Re: Source for SDRAM chips Reply with quote
If I have to do it again, I think I'll design in a SODIMM socket anyway
(at least for prototypes). Being able to upgrade the RAM ex post facto
is a Good Thing :)
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Richard H.
Guest
Posted: Tue Dec 28, 2004 10:54 pm    Post subject: Re: Source for SDRAM chips Reply with quote
larwe@larwe.com wrote:
Quote:
If I have to do it again, I think I'll design in a
SODIMM socket anyway (at least for prototypes).
Being able to upgrade the RAM ex post facto
is a Good Thing :)

Lewin,

When I last looked into this, I discovered SIMM sockets were very
expensive through the Usual Sources - ballpark USD$25. Even if the SDR
SIMM was free, the solution was much more expensive than just buying an
oversized chip. Have you found a source for SIMM & DIMM sockets that's
reasonably priced?

Also, you mention SODIMMs - are you using a DRAM controller? SDR seems
to be the end of the road without one (timing stability, clock speed,
etc.), but apparently they aren't available as discrete parts anymore -
know of any discrete DRAM controllers?

Richard
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