Shop OBEX P1 Docs P2 Docs Learn Events
Micro (0603) Super capacitor. — Parallax Forums

Micro (0603) Super capacitor.

Clock LoopClock Loop Posts: 2,069
edited 2014-02-22 22:04 in General Discussion
I tried to look into super capacitors, expecting to find smt 0806, 0603, 1210 versions for lots of money.

But only thing i can find are batteries(coin cell) NOT even close to a 0806.



So basically, largest Farad i could find in 0603 was a 68uF tantalum 4v cap. in 0603.
http://www.digikey.com/product-detail/en/F980G686MMA/478-8636-1-ND/4006125


Anyone know of a REAL 0806 smt super cap?

Comments

  • Cluso99Cluso99 Posts: 18,069
    edited 2014-02-20 22:45
    Don't expect to see 0805 or 0603 supercaps for a number of years yet..

    In the early 70s our lecturer said a 1F capacitor would be the size of ourbuilding - 3 storey and ~10 classrooms/floor. Thts why a 1F was theoretical backthen.

    Of course when we get to ICs running at millivolts then maybe we will get 1F 10mVin 0805. I have learntover the years that nothing seems ultimately impossible.
  • CuriousOneCuriousOne Posts: 931
    edited 2014-02-20 22:56
    Your teacher was misinformed I believe.

    I had (and still have somewhere), supercap made in early 70s, size is about 9mm dia 5mm height. capacity is 1.2f, but voltage 0.5v

    and voltage can't go that down in capacitors - the voltage is that creates the barrier, which allows capacitance.
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2014-02-21 03:30
    Even if you manage to acquire a 1F supercapacitor for your dream project, how are you going to handle the inrush current?

    There a specific design issues with the deployment of huge capacitors that need to be considered. I have a couple of supercaps that I thought I might use as backup power, but the need to control the inrush current pointed the way to better options for a continuous backup powered microcontroller.
  • TubularTubular Posts: 4,703
    edited 2014-02-21 12:16
    These are the closest thing I know of, around 1 F in a surface mount pack. http://www.cap-xx.com/index.php

    Generally, you use these in an application where you have a large sudden discharge (radio tx, led flash, time machine), but a relatively long time to charge the cap back up (energy harvesting, coin cell etc). Normally you can just take the energy as fast as the source can supply it, but a charging resistor would solve the current inrush issue if required
  • piguy101piguy101 Posts: 248
    edited 2014-02-21 13:09
    I have a couple of 82F capacitors and a 400F one, which is about the size of a D battery. I have no use for them except that they are fun to play with. I can make steel wool glow for a few minutes from just one capacitor.
  • Cluso99Cluso99 Posts: 18,069
    edited 2014-02-22 00:43
    CuriousOne wrote: »
    Your teacher was misinformed I believe.

    I had (and still have somewhere), supercap made in early 70s, size is about 9mm dia 5mm height. capacity is 1.2f, but voltage 0.5v

    and voltage can't go that down in capacitors - the voltage is that creates the barrier, which allows capacitance.
    I did say early 70's - in fact it was 1970. However I do not recall any supercaps being available in the 70's, at any voltage. Nothjng really ran less than 5V.
  • Mark_TMark_T Posts: 1,981
    edited 2014-02-22 12:32
    Clock Loop wrote: »
    I tried to look into super capacitors, expecting to find smt 0806, 0603, 1210 versions for lots of money.

    Anyone know of a REAL 0806 smt super cap?

    Impossible, they explode if heated to soldering temperatures, being liquid electrolyte. They can only be
    soldered by hand and with flying leads.
  • Clock LoopClock Loop Posts: 2,069
    edited 2014-02-22 22:04
    Mark_T wrote: »
    Impossible, they explode if heated to soldering temperatures, being liquid electrolyte. They can only be
    soldered by hand and with flying leads.

    Wow, ... well where the F are all those universities, and other government paid lackies doing with all those neat technologies you find making headlines and then going no where fast..

    Carbon nano-tube batteries... etc.. i mean don't give me that, slow development of integration into previous photolithography processes, ... thats the only field they search in, are materials that have potential for direct application in modern micro-fabrication methods. but you never see the stuff... i suspect its patented and then ate up by darpa, ratheon, northrop grumman, and all the other military industrial complex money munching monsters. can't produce and then sell a product that uses a patent when its owned by organizations that thrive on keeping things locked inside a bottle due to near unlimited funding, and a secrecy mandate in order to even do business.

    Money talks, and doubters walk.
Sign In or Register to comment.