(Topic ID: 159412)

How does a SIP resistor work?

By mcklit

7 years ago



Topic Stats

  • 8 posts
  • 6 Pinsiders participating
  • Latest reply 7 years ago by barakandl
  • Topic is favorited by 5 Pinsiders

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    #1 7 years ago

    Hi

    I need to replace som SIP resistors which are quite rare and hard to find. So I'm looking at alternatives but need to know more about how the work before placing an order.

    Please look at pictures below. In the component list entry #86 is specified in note #16. In this note there is a list of SIP 8R 8C 10-pin items where as one is SRC9. In entry #82 we find SRC6 which is a SIP 9R 10-pin component.

    If I get this right, SRC9 uses 8 resistors (and 8 capacitors) in a 10 pin configuration. If I look at the schematics for SCR9 is see that pin 1 is not connected and pin 10 is ground. This leaves 8 pins each with a resistor connected in a bus configuration. It all makes sense.

    If i look at SRC6 it uses 9 resistors. But in the schematics it also has pin 1 not connected and pin 10 as ground. So how can it have 9 resistors?

    And another question - where is pin 6 on jumper 8 connected? Looks strange - or ?

    Guess I'm getting something wrong here !

    src9_(resized).JPGsrc9_(resized).JPG

    src6_(resized).JPGsrc6_(resized).JPG

    SIP_spec_(resized).jpgSIP_spec_(resized).jpg

    #2 7 years ago

    Why do you think pin 1 is not connected. It clearly connects to VCC (5v).

    Get replacements here...

    https://www.greatplainselectronics.com/products.asp?cat=121

    No need to worry about the capacitor component of the originals, standard resistor arrays are fine.

    --
    Rob Anthony
    Pinball Classics
    http://LockWhenLit.com
    Quality Board Work - In Home Service
    borygard at gmail dot com

    #3 7 years ago

    Nice research!
    faz

    #4 7 years ago

    Hi Rob

    I stand corrected Thanks for sharing. Highly appreciated for a novice like me !

    Anyway - I tried to find a 10 pin 8 resistor 4.7k SIP, but I only find a version with 9 resistors. (Resistor Network, 4.7K x 9, 10 Pin Bussed - Part Number: 4610X-101-472). Will that be ok ?

    Thanks again !

    #5 7 years ago

    Well - I found this, which answers my question. http://pinballrehab.com/1-articles/solid-state-repair/board-rework-test/233-electronic-component-substitution

    I didn't know that ground is only needed when having a capacitor in the SIP. So - I'll order the 4.7K 9R 10-pin version and cut the 10 pin off.

    Once again - thanks for helping out !

    #6 7 years ago

    Or just order the 9-pin resistor network with 8 resistors -- 4609x-101-472. No clipping the 10th pin for that one plus the 9 pin version is substantially cheaper (not that the 10 pin one cost an arm and a leg, either).

    #7 7 years ago
    Quoted from mcklit:

    Well - I found this, which answers my question. http://pinballrehab.com/1-articles/solid-state-repair/board-rework-test/233-electronic-component-substitution
    I didn't know that ground is only needed when having a capacitor in the SIP. So - I'll order the 4.7K 9R 10-pin version and cut the 10 pin off.
    Once again - thanks for helping out !

    This old PINSIDE thread could have helped you much too, especially the little grafic in post #4.

    https://pinside.com/pinball/forum/topic/resistor-network-part-numbers-sys11#post-2760458

    #8 7 years ago

    Untitled_(resized).jpgUntitled_(resized).jpg

    Resistor networks help to reduce number of solder joints, board size and complexity.

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