Issue link: https://iconnect007.uberflip.com/i/1478618
SEPTEMBER 2022 I DESIGN007 MAGAZINE 17 the only option now may be to go to a larger part because there may be plenty of 1206 parts that are functionally the same. It's just that now you need a space for a 1206 for that part that used to be an 0402. How do you incorporate that larger part into the area it was allotted for? is is where practical packaging density plus comes in. If you take the allotted space for the part and add a little plus to it, then you can potentially reduce the domino effect. Holden: I'd like to read more about practical packaging density plus. Dack: Let's collaborate on that, Happy, because the tendency for designers is to call up suppli- ers or sources and find out, "How small can I get this thing?" For some reason, we gravi- tate to thinking, "I don't want to waste any material." You suck all the dimensions around every- thing so that we're not wasting all this material. But that has ramifications, and it robs some of the stakeholders. When you make things to the minimums, it causes problems for a major- ity of the stakeholders. While it may meet the requirements of the industrial design stake- holder, because now it fits into their pack- age and all the front-end parameters are met, the people who have to deal with rework and repair and redesign can be affected adversely. So, you can't discount the advantage of includ- ing the plus; adding a little extra space in there is good. Holden: Well, I hear you. My soapbox is partic- ularly with engineering. Can we put this into a model? Before you ever start, you would do the practical packaging density plus, plug in the numbers and you say, "Uh-oh, I've got a problem, because it's larger than the available area they gave me," rather than putting the design out and realizing that you have to start all over. Predictive engineering lets us predict the bottlenecks before we fall into the bottlenecks. Dack: at sounds very interesting. It's like right-sizing, and it sounds good, but it's sub- jective. An effort like this, to come up with a formula or analysis, would require buy-in from all the stakeholders. What is the target condition of each individual stakeholder? How do we compromise? What's the best way to compromise to right-size the product design? We teach in the IPC CID program that this critical buy-in opportunity should be facili- tated for all project stakeholders at the start of a project so we can effectively "measure twice and cut once." Matties: But that may be what you have to do. You don't want to go up to the minimum just because you can, especially with this supply chain. Shaughnessy: Well, Kelly, it's been great, as usual. anks for your time. Dack: ank you guys. I'm looking forward to seeing you all at trade shows. DESIGN007