micro SD socket help...(part finding)

Projects General Guidance
1

Hey gang...

I am looking for a a micro SD card socket to be used in one of my projects...

I havent found many different types.. especially ones that have Eagle symbols for.. :wink:

The one requirement I would like to have is the style of uSD socket that has the pins on the BACK.. (even sides located might do..if you can find one) :stuck_out_tongue:

(cant find much more info on this one for s side mounted.. datasheet or Eagle part: http://www.mouser.com/Search/ProductDetail.aspx?R=SCHA2B0300virtualkey68800000virtualkey688-SCHA2B0300 )

there is one at DIPMICRO.. (pins in the back) that I really like alot.. but they are a bit wider than normal ones....

Sparkfun also 'used' to sell a STYLE 2 micro SD socket.. with pins in the back (sort.. somewhat under the component..and very small)..but the only other one I could find besides the DIPMICRO version)

searching around I found this one by MOLEX???:

http://www.molex.com/molex/products/listview.jsp?query=502702-0891&channel=Products

http://www.molex.com/pdm_docs/sd/5027020891_sd.pdf

'looks' like it could be a good replacement for the Sparkfun Style 2 ones:

those are no longer sold.. plus the pins are sticking out the back enough to be 'easy'.... these replacement ones seem to be longer (pins sticking out wise)

anybody offer some input/suggestions? on a micro SD socket with pins on the back..'or' a second set of eyes on the possible replacement one I found here?

thanks! :slight_smile:

update:

geez.. to make it more confusing.. I found these at mouser too: not sure if any of them will 'work' though.. (hardware is my kryptonite!) lol

DMD3D-SF:

http://www.hirose.co.jp/cataloge_hp/e60900232.pdf

503182-0852:

http://www.molex.com/pdm_docs/sd/5031820852_sd.pdf

The original 502702-0891: (from above)

http://www.molex.com/pdm_docs/sd/5027020891_sd.pdf
http://www.molex.com/molex/products/listview.jsp?query=502702-0891&channel=Products

Another from Molex:
503182-0892:

http://www.molex.com/molex/products/listview.jsp?query=503182-0892&channel=Products
http://www.molex.com/pdm_docs/sd/5031820892_sd.pdf

503182-0832:

http://www.molex.com/webdocs/datasheets/pdf/en-us/5031820832_MEMORY_CARD_SOCKET.pdf

http://www.molex.com/pdm_docs/sd/5031820832_sd.pdf

this is my first time researching micro SD sockets like this..

I just realized I only had 2 of the old sparkfun style II micro sd sockets.... before I sent off for some PCB's..

so I need something.. with a similar footprint.. and with pins in BACK.. (and not as wide as the DIPMICRO one).. LOL

any feedback is appreciated.,

thanks

2

bump..

anyone help me located a micro SD socket part with pins on the BACK.? that is smaller in width than the DIPMICRO one?

or give me a second set of eyes on the ones I found mouser/molex? I always second guess myself at this stuff. (hardware)

thanks!

3

So you want a non-Push-Push socket, basically a friction fit socket.

Ah - a push-pull socket.

4

Will a SIM card hold what you need?They are certainly narrower.
What's the ultimate goal? A board as narrow as a leadless uC chip?

5

Yikes!..

is that what those are? the non-push/push types?

if so..that is NOT what I want..

I 'love' the DIP micro one...

but when I was designing the uSDuino project/board..

the DIPMICRO SD socket is a lot wider than other versions...

I had originally used the uSD scoket from sparkfun.. STYLE 2 I believe.. as it that was the style that has the pins in the BACK.. not UNDER it.. (much like the DIPMICRO one)..

however..

1.) Sparkfun has stopped selling them
2.) I only have like 2 left in my own inventory from long ago..
3.) looking at them closer.. shows the pins in the BACK.. and still 'very' small.. and not as 'long' as the DIPMICRO one..

so the goal was to keep the same width or close to the Sparkfun version..... but find one with the pins in the back, as long as the DIPMICRO ones..

I tried to search around.. but got overwhelmed fast!.. so I figured Id reach out here, to those who has a bit more experience with uSD sockets (hardware)..etc..

6

bump.. :wink:

anybody got any leads on where I might find one? or if those in fact will work?

again to summarize.

** used a sparkfun microSD socket (style 2, pins in back).. for a layout. (those arent sold any more.. and in reality, the pins in back dont protrude out much AT ALL)

** DIPMICRO has microSD socket pins in back are PERFECT!.. but this particular socket is MUCH wider than others I have seen (sparkfun, others with pins on bottom..etc)

trying to find a DIPMICRO style (longer pins, located in back).. but width of your normal microSD scokets.. (push/push type)

thanks!! :grin:

7

The only push/pull, friction-fit, manual eject, whatever they can be called, that I have seen in uSD to SD adapters.

The Molex DM3D at 11.95mm is too wide? The card itself is 11mm. Can't go much smaller.

If 11.95 is too wide, suggest you look at smaller cards.
Or put a non-removable chip there instead, like a 256K x 8 SPI interfaced FRAM,
6.8mm or 8mm wide PCB layout depending on the package, put a couple if you want 512K x 8.

search FRAM, select Memory, select FRAM, select SPI, select part size (2M)

8

Hi Robert-

11mm is nice!.. (but is it push/push?) Actually.. Im just looking for around 14mm! if it its push/push.. :slight_smile:

the DIPMICRO one seems to come in at around 16.35mm (measure with digital calipers..cant find datasheet on DPIMICRO for it) or so (including the GND tabs on sides)..

but I couldnt find one that was PUSH/PUSH... & had pins in the back??.. maybe these ones in the datasheet will work? hard to understand the diagrams! :(.. are thes pins in the FONT? (easy access.. uSD coard just goes in.. on top/over the pins in the front then?)

however.. looking at that DM3CS, hinge version is something new I have not seen a HINGED microSD socket? actually if its easier to solder? has pins for access..

pins on the BACK are hard to come by eh? lol

(looking to stick with microSD format.. easy to update/access any data..)

if only the DIPMICRO one was so wide! :(..

I have 3 physical microSD sockets in front of me..

DIPMICRO = too wide
SPARKFUN style 2: no longer available & pins on back are very small/short
UNKNOWN - looks to have pins in 'front/middle'' the top of the case has hole(s) in it.. looks like I might be able to solder those through there?..

have to see about finding one that matches I guess..

*** also got your email!.. I'll remind you on Friday.. (no worries.. while the email may have seemed long.. its not hard... really verify I have the correct part.. and help me find that diode & 100uF tant.. (in that C3525 package its in)..

9

Mouser Part #: 538-502702-0891 ??

Push-push, pins in back, 14.2mm wide, 15mm with the mounting ears, 15.6 with recommended pad size.

The DIPMicro parts are 17.75mm edge to edge of the side solder pads that hold it on the board.

You need to jump in to the mechanical drawings! They are not so bad if you don't panic :slight_smile:

10

nice!.. 538-502702-0891 looks as if it may work.

(now about an Eagle part? lol.. might have to make one from scratch... :astonished: =( )

however.. all this talk has me thinking about those 'hinged' sockets.. anyone use one before?

this would allow one to not have the socket on the 'edge'..but in the middle if need be.

it making the footprint form scratch proves to be too difficult..

I'll opt for this one to replace the current SPARKFUN style 2 socket that is being used right now:

http://www.ladyada.net/wiki/partselector/connectors#memory_card_connectors

3M 2908-05WB-MG

I have a 3M one in my hand.. it fits.. footprint will work in the PCB layout (between the two rows of pins)

but both Mouser (12 week lead time) & Digikey do not have them.. LOL

http://www.mouser.com/ProductDetail/3M-Electronic-Solutions-Division/2908-05WB-MG/?qs=vnwGVgFuQiba973vsbvAKbnJDXwF1udG

looking at the pcb layout/room again.. I think I only have about 15.24xxmm or so (maybe a smidge more)...but not 15.6 unfortunately.

11

That 2nd part from mouser will be hard to hand solder with the pins in the middle of it.
I can't see the adafruit part from here, but you might be able to export their library for it.
What are you doing that needs to be so thin?

12

HI Robert-

its the uSDuino board.. (I'll attach here)..

its not ab-normally small.. I just need it to be 'normal' (where as the DIPMICRO one is much wider than most uSD sockets)

that last one I just posted from Mouser.. the 3M version..

I actually have one in my hand. the pins are in the middle.. 'however' the there is a 'hole/space' in the top to get access to the pins.. (if you careful).. I could probably pull it off...

the problem is this:

1.) need to fit in space (width provided/allowed on the pcb).. not a problem.. most do.. (except DIPMICRO sized ones..which are abnormally wider than most other)

2.) if fits in space.. need to address 'where' pins are.. I will be soldering these by hand.. so pins in back are preferred.. (if they really protrude out the back, like the DIPMICRO ones..and NOT like the Sparkfun Style 2 sockets 'claim' to

summary:

Sparkfun Style 2 socket was used.. its no longer made (plus pin on back suck)

DIPMICRO - too wide (love the pins on back though)

3M - one last posted/found from Mouser.. (I have physically in my hand).. fits in area on PCB. no pins on back!.. in middle!.. but I could perhaps access through area/opening in top cover.. - found these are discontinued as well

I have attached the .brd file (and schematic) to look at.. you have seen it before though. (ITS NOT THE AUDIO/DAC board!!)

the current/original layout used the Sparkfun Style 2 microSD socket.. (which is discontinued..)

I added in the Adafruit microSD socket footprint to compare.. as this is the 3M one I just found (pins in middle.. BUT accessible), again these are discontinued as well)

** The adafruit part you cant see is the 3M socket.. they have it in their library.. I added it to the board to compare.

both sockets in the layout FIT as far as width!!.. I just need to

1.) find something in stock
2.) ensure I can access the pins to solder, whether in back.. or easily accessed from the top.. (not all I looked at had big openings at top to access pins)..

thanks

new_socket.zip (57.5 KB)

13

Take a look at newark.com as well, they had several pages with uSD sockets listed.
Their website is down at the moment.

14

Also Arrow - try this link
http://components.arrow.com/part/search/^4/51/215
Select Micro SD card