Shop OBEX P1 Docs P2 Docs Learn Events
transistor arrays ideas — Parallax Forums

transistor arrays ideas

Erik FriesenErik Friesen Posts: 1,071
edited 2010-04-09 14:40 in General Discussion
I have been flogging the internet for some soic uln2803s. The best I can find is 2804s which are apparently for higher voltage inputs. The problem is all this out of stock stuff. Arrow has some, but you have to have purchased previously from them or they won't sell them to you. Does any one know of some good options for arrays that work with 3.3v level logic? They have to be sm.

Comments

  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2010-04-03 04:17
    Futurelec.com
    They seem to have quite a few types of chips. They are a bit slow on delivery though. They ship from various places including Thailand.

    But with the UNL2803, you may not easily be able to locate surface mount. Why so? They dissipate quite a bit of heat, so a bigger DIP package is more stable. And, they are used as a protective buffer for microcontrollers. So they are better as a socketed replaceable device than surface mounted.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Ain't gadetry a wonderful thing?

    aka G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan

    Post Edited (Loopy Byteloose) : 4/3/2010 4:27:04 AM GMT
  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2010-04-03 04:31
    There are some listed on eBay. That's about it, though. Yikes! Welcome to the recovery!

    -Phil
  • mikestefoymikestefoy Posts: 84
    edited 2010-04-03 05:42
    according to the TI websire, their distys seem to have loads


    http://focus.ti.com/docs/prod/folders/print/uln2803a.html


    Mike
  • Erik FriesenErik Friesen Posts: 1,071
    edited 2010-04-03 12:08
    These are for led drivers, because I didn't feel like running 24 20ma inputs off of my micro.

    I am using capacative touch, so the pcb needs to sit directly against the plastic. I didn't have the company cnc that particular spot, so I would have to cut the dip backside flush, or something.

    The TI website is not clear. They show lots, but when it gets to the nitty gritty, you can't get them.
  • Erik FriesenErik Friesen Posts: 1,071
    edited 2010-04-03 12:09
    It looks like I may be able to get them from ebay. We'll see.

    I got one quote from someone that wanted $3.32 per chip. They are around $0.80 normally.
  • PJAllenPJAllen Banned Posts: 5,065
    edited 2010-04-03 16:15
    Transistors (bipolar VMOS, NMOS,...)·and resistors·abound.·

    [noparse][[/noparse]The pkg_diss of each device IS the Max, unrelated to any other channel etc.]
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2010-04-09 14:40
    I have a very strong suspicion that manufacturers will produce the SMS version if ordered in quantify, but produce the IC for small quantity sales.

    The result is that looking at a manufacturers listings are likely to never reflect the reality of what is available in small quantity.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Ain't gadetry a wonderful thing?

    aka G. Herzog [noparse][[/noparse] 黃鶴 ] in Taiwan
Sign In or Register to comment.