I'm trying to include a micro SD card slot in a project I'm working on and I'm having a little trouble with the datasheet. Unfortunately I don't read japanese.

Just wondering what the text says in the 3 Shaded boxes on page 2:

enter image description here


Can I run PCB tracks under the shaded region back to my processor?

  • \$\begingroup\$ Now I wonder what パターン is supposed to be. "Part" doesn't quite fit. \$\endgroup\$ Commented Jun 14, 2018 at 13:56
  • 2
    \$\begingroup\$ I remember having had to guess that exact same thing... I don't clearly remember what my conclusions were, though. Certainly something along the lines of "Damn molex, lemme get that from another manufacturer"... \$\endgroup\$
    – dim
    Commented Jun 14, 2018 at 14:17
  • 4
    \$\begingroup\$ @SimonRichter "パターン" is "pattern". \$\endgroup\$
    – falken
    Commented Jun 14, 2018 at 15:14
  • 1
    \$\begingroup\$ Wherever possible, it's best to have the physical part in hand when you're designing the board. In theory the data sheet should be enough. In practice, even without a language issue, you're better off with the sum awareness of what the vendor wrote, and what you can see with your own eyes. \$\endgroup\$ Commented Jun 14, 2018 at 15:20
  • 1
    \$\begingroup\$ By the way there is a Japanese language stack exchange japanese.stackexchange.com where there might people who can help \$\endgroup\$
    – user13267
    Commented Jun 15, 2018 at 3:04

3 Answers 3


Google translate on your phone can do this:
enter image description here

  • Parts prohibited area (部品搭軾禁止エリア)
  • Pattern prohibited area (パターン禁止エリア)
  • Soldering prohibited area (半田付け禁止エリア)
  • 2
    \$\begingroup\$ So in other words: "Keepout"... \$\endgroup\$
    – brhans
    Commented Jun 14, 2018 at 14:19
  • 11
    \$\begingroup\$ How do you know what phone the OP has? \$\endgroup\$
    – PlasmaHH
    Commented Jun 14, 2018 at 14:23
  • 4
    \$\begingroup\$ @PlasmaHH phone isn't really relevant. Web google translate will do it too - there's a handwriting input method so you can just write the characters in and it will translate them. Getting the stroke order mostly correct is all you really need to know there. \$\endgroup\$
    – J...
    Commented Jun 14, 2018 at 19:10
  • 10
    \$\begingroup\$ @J... lol if the OP doesn't know Japanese, how in the world do you think they'll be able to get the stroke order correct? I'm learning Japanese and I'd still be guessing. \$\endgroup\$ Commented Jun 14, 2018 at 21:50
  • 2
    \$\begingroup\$ @PlasmaHH What makes you think he knows what phone the OP has? \$\endgroup\$
    – bye
    Commented Jun 15, 2018 at 12:50

Disclaimer: I am clueless about EE, but read Japanese well enough to look this up.

Black box: 部品搭載禁止エリア = "components/parts-loading prohibited area" (don't put stuff here, I assume).

Diagonal lines: パターン禁止エリア = "Pattern prohibited area" (I don't know what "pattern" refers to in this context, but don't do it there).

Diamond box: 半田付け禁止エリア = "solder-attaching prohibited area" (don't solder anything here). 半田 (handa) is "solder" in case you see that elsewhere.

  • 3
    \$\begingroup\$ "Pattern" possibly "traces?" \$\endgroup\$
    – JRE
    Commented Jun 14, 2018 at 16:27
  • 1
    \$\begingroup\$ @AliChen Thanks for the correction, you correct! It seems likely to me the word "pattern" here refers to the land pattern aka the footprint. This spec sheet, for instance, refers to it both as パータン and ランドパターン. \$\endgroup\$
    – undercat
    Commented Jun 15, 2018 at 2:18

In this micro-SD socket the spring contacts are located at the bottom of footprint, and during card insertion they may touch the PCB surface. Therefore there is a chance that PCB protective layer will be compromised over time, and the contacts will touch traces, if any. Therefore the manufacturer recommends to leave the shaded area without routing any signal traces or ground pours.

The black area is around the insertion detect contact, which moves sideways, so keep other components out of that area.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.