-13F would be the minimum I would expect to see. That is pretty much
the minimum OAT here and the enclosures are usually at least 10F warmer.
I would expect internal heating to keep the SD warm. What is the
failure if the SD card is too cold? The unit won't boot until it warms
up? I could live with that in a cold start situation.
Mark
On 5/18/15 10:09 PM, Forrest Christian (List Account) wrote:
What is the lowest temperature that each of you would normally expect
to see in your enclosures?
The reason I'm asking is that I'm in the process of developing up a
few new products.
To date, all of the packetflux products are designed with components
rated -40 to +85C (I.E way cold to way hot). I'd like to retain this
rating, but I'm running into a minor snag:
For storage, I'm planning on integrating a SD card (probably microSD)
in a socket. I only need a GB or so, and SD card memory is
inexpensive at that range.
Unfortunately, all the reasonably priced SD cards are only rated down
to about -25C or -13F. which are about ~$3 in qty. "Industrial
temperature range" ones which are good down to -40C/F are available
but they add at least $30 to the cost for non-name brand, and even
more for known brands. When you're talking about a $100 end-user
price, a $30 1GB SD card seems excessive - and probably isn't even
possible if I want to meet the $100 price with some margin.
So, I'm currently playing the 'what options do I have' game. I hate
to ship a product only rated down to -25C/-13F, but I know for at
least a large chunk of my customer base they never see below this
temperature, especially when you add a watt of power dissipation in
the case with the device. Which leads me back to my original
question: What's the lowest temperature most people would expect to
see inside their enclosures.
--
*Forrest Christian* /CEO//, PacketFlux Technologies, Inc./
Tel: 406-449-3345 | Address: 3577 Countryside Road, Helena, MT 59602
[email protected] <mailto:[email protected]> |
http://www.packetflux.com <http://www.packetflux.com/>
<http://www.linkedin.com/in/fwchristian>
<http://facebook.com/packetflux> <http://twitter.com/@packetflux>
--
Mark Radabaugh
[email protected]
419-837-5105 x1021
[email protected]
