+ Post New Thread
Results 1 to 8 of 8
  1. #1
    Advanced Member level 5
    Points: 30,194, Level: 42
    Achievements:
    7 years registered

    Join Date
    Sep 2008
    Location
    cambridge
    Posts
    6,313
    Helped
    466 / 466
    Points
    30,194
    Level
    42

    Wish to buy heatsink from Fischer

    Hi

    We wish to buy a couple of these "SK469 35 STS" heatsinks from Fischer but they are not in stock anywhere.
    Fischer have not responded to my eamil.
    Do you know how we can buy them?

    https://www.fischerelektronik.de/web_fischer/en_GB/heatsinks/A04/Extruded%20heatsinks%20for%20PCB%20mounting/VA/SK46935STS/$productCard/dimensionParameters/index.xhtml

    •   AltAdvertisment

        
       

  2. #2
    Full Member level 6
    Points: 3,125, Level: 13

    Join Date
    Sep 2013
    Posts
    366
    Helped
    143 / 143
    Points
    3,125
    Level
    13

    Re: Wish to buy heatsink from Fischer

    Treez this part having high lead time, you can check with their worldwide distributers someone having stock !!
    Otherwise you can select another vendor heat sink thermal resistance is 13K/W or 13C/W

    https://www.fischerelektronik.de/en/...ors-worldwide/
    http://www.anglia-live.com/products/...tsink-pcb-35mm


    1 members found this post helpful.

    •   AltAdvertisment

        
       

  3. #3
    Advanced Member level 5
    Points: 14,700, Level: 29

    Join Date
    Nov 2012
    Posts
    2,716
    Helped
    637 / 637
    Points
    14,700
    Level
    29

    Re: Wish to buy heatsink from Fischer

    Do you know how we can buy them?
    I am not so sure, but did you try china suppliers? I see that heat sinks cost an arm and a leg!


    1 members found this post helpful.

    •   AltAdvertisment

        
       

  4. #4
    Super Moderator
    Points: 247,995, Level: 100
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    43,137
    Helped
    13126 / 13126
    Points
    247,995
    Level
    100

    Re: Wish to buy heatsink from Fischer

    You can send a request in the online portal. Had no problems to purchase heatsinks from Fischer yet.


    1 members found this post helpful.

  5. #5
    Advanced Member level 1
    Points: 3,749, Level: 14

    Join Date
    Feb 2014
    Posts
    478
    Helped
    174 / 174
    Points
    3,749
    Level
    14

    Re: Wish to buy heatsink from Fischer

    That heatsink isn't particularly special. I can think of a few on digikey that would fill a similar role.

    Digikey lets you search by the type of package cooled and there are dozens for TO-220.


    1 members found this post helpful.

  6. #6
    Advanced Member level 5
    Points: 30,194, Level: 42
    Achievements:
    7 years registered

    Join Date
    Sep 2008
    Location
    cambridge
    Posts
    6,313
    Helped
    466 / 466
    Points
    30,194
    Level
    42

    Re: Wish to buy a heatsink from Fischer

    Do you think it will be possible to easily solder the solder tab on the SK 469 35 STS heatsink?.....

    https://www.fischerelektronik.de/web_fischer/en_GB/heatsinks/A04/Extruded%20heatsinks%20for%20PCB%20mounting/VA/SK46935STS/$productCard/parameters/index.xhtml

    ...surely the soldering iron's heat will just get absorbed up into the heatsink itself?



    •   AltAdvertisment

        
       

  7. #7
    Full Member level 6
    Points: 3,125, Level: 13

    Join Date
    Sep 2013
    Posts
    366
    Helped
    143 / 143
    Points
    3,125
    Level
    13

    Re: Wish to buy a heatsink from Fischer

    Treez, The solder pin of heat sink is very small it having 1.3mm diameter and 3.5mm length and also pin is attached to heat sink by press fit of other method. So the chances of heat absorption during soldering process is very less. the soldering tip size is bigger than pins. You can solder even 50W soldering iron.


    1 members found this post helpful.

  8. #8
    Advanced Member level 5
    Points: 14,700, Level: 29

    Join Date
    Nov 2012
    Posts
    2,716
    Helped
    637 / 637
    Points
    14,700
    Level
    29

    Re: Wish to buy a heatsink from Fischer

    it will be possible to easily solder the solder tab on the SK 469 35 STS heatsink?
    It is there only to provide mechanical or physical support. Nothing will happen if you leave it unconnected or hanging.

    However, it may be good to solder it if the PCB is being mounted on structure that is prone to vibrations. If the heat sink is unsupported, lots of vibration energy (which is proportional to the mass) will go into the legs of the transistor (and that is hardly desirable).

    Yes, to solder that pin you may need a power soldering iron (40-60W) and keep a large pad to support the beast.


    1 members found this post helpful.

--[[ ]]--