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How Practical Are 01005-Size Chip Resistors?

From a supplier standpoint 01005-size chip resistors require very advanced thick film deposition equipment with extremely tight process control as well as more advanced thick film materials. Beyond that, they require advanced laser trimming systems for calibration and very precise breaking equipment and processes to treat them.

But maybe the most absurd of all the issues in manufacturing this size of resistor is that the packaging constitutes nearly 70 percent of the total component cost. When the part actually gets to the customer for building the end product, estimates currently show the successful placement rate for the 01005 chip resistor is around 90 percent.

This means 10 percent of the resistors manufacturers buy don’t even make it to the board because they are lost in the placement operation.

Clearly, unless the product you are building is forced to use resistors of this size, it makes much more sense to stick with at least 0402 sizes or to switch to a chip resistor array to reduce component count and increase density while also lowering total acquisition cost per resistor.

8 comments on “How Practical Are 01005-Size Chip Resistors?

  1. Parser
    November 29, 2010

    The size of 01005 is 0.018 x 0.008 which is smaller than 0201 but the nomenclature has changed.   They are aiming at mobile phones, cameras and micro drives. It is time to come up with a printing process directly on a PCB and make resistors the integral part of the PCB layout and PCB manufacturing.    

  2. Hardcore
    November 29, 2010

    I would have to say that the real issue  will not be down to production with such  parts.Ultimately most high volume manufactured products are assembled by automated equipment.

    The issue will come when the products need to be repaired, at this stage in the process it will be the human repairmen that take over, since automated repair is just something that cannot be easily implemented of centralized.

     I would guess that a high power lens system or even a low power Stereo microscope will be necessary along with a new set of repair tools and systems. Even with the 0805 parts , there is a need for a low power Stereo microscope in some cases.

    The only other solution is that we become more of a 'throw away society' than we currently are, and junk any product that fails ,without attempting to repair it.

     

  3. Clairvoyant
    November 29, 2010

    I would say mobile devices are already at a stage where damaged or non-working sections of the product would be thrown away and replaced. It is too costly to spend time troubleshooting issues with these products when the components are so small, and the product can be made so cheap now.

  4. Hardcore
    November 29, 2010

    Hi,

    That would depend very much on the market, one only has to take a trip to Sam Sui Po in Hong Kong to see there is a significant market for repaired mobile phones, I would also consider it unlikely for a manufacturer such as Nokia to 'trash' off product that was defective in the factory or early on in the warranty period,since most mobles are moving towards single PCB solutions, such a system would require scrapping of a significant amount of the hardware including the IC's , which is where the most cost id found.

     

     

     

  5. Backorder
    November 30, 2010

    I think the idea that resistors be made part of the PCB printing process and be incorporated in the layout rather than the assembly process makes a lot of sense! I would like to know if something along this line is being pursued already.

  6. Parser
    November 30, 2010

    Yes, it would good to find out. It was my idea as I was reading the article.

  7. Backorder
    November 30, 2010

    Also, it would be very interesting to know what the rejection ratios are for small packages like the Quad Flat No Lead(QFN), Small Outline No Lead(SON) and the BGA type. Some of these packages if placed improperly might lead to the board rejection itself!

  8. Hardcore
    November 30, 2010

    Hi backorder,

    The integral resistors on a PCB are already part of PCB production processes. The issue however relates  to printing them down, the fact that then need to be a 'wet' process.

    which means you have to really control the quality of the ink because if it is not kept mixed then you get 'blotchy' resistors  where the value is not consistent, then there are issues related to cleanliness of the pcb and  ink thickness, and then there is the physical size issue related to printed resistors, since most are screen printed

    Ohms law makes laying down this sort of resistor 'difficult' if high accuracy parts are required, as any variation in thickness or dimensions results in a different value.

    Personally I don't think we will see much progress into this until the technology for direct printing of components comes on line, at which point inkject printers with highly refined dot sizes will assist im making many of these problems disappear.

    What will be really interesting is that distributors will then become more akin to  printing material suppliers, supplying the inks required for laying down the components, possibly with a second line of distributors supplying the cad files for the actual individual components. (forgery/fakes are going to be made really interesting in this environment)

     

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