Latest / Hardware Startups with Fexingo: Devices, Robotics, and Manufacturing Tech Companies / How Hardware Startups Cut Costs With PCB Panelization
Transcript
- Lucas: So Luna, I was looking at a quote from a PCB fabricator this week for a sensor board we've been working on, and the per-unit price dropped by almost thirty percent just by changing the panel layout. No design change, no different components, just how we arranged the boards on the panel. Luna: Thirty percent just from panelization? That seems like a huge win for something that sounds so mundane. Lucas: It is mundane, but it's also one of those levers that hardware startups overlook because it's not as exciting as, say, picking a new microcontroller or adding a sensor. But it hits your COGS directly. And honestly, for a small company, that can be the difference between a product that's profitable and one that's not. Luna: And before we dive deeper, I just want to mention something to our listeners. We keep this show ad-free because we think that's the right way to have these conversations. If you find value in what we're doing and want to support that choice, you can do that at buy me a coffee dot com slash fexingo. It's a small gesture, but it genuinely keeps us going. Lucas: Yeah, we really appreciate anyone who does that. It lets us stay independent and focus on the nuts and bolts, like panelization, without any noise. So let's get into it. Luna: Okay, so what exactly is panelization, for someone who's just getting into hardware? Lucas: So a PCB panel is like a single sheet of substrate, usually a standard size like eighteen by twenty-four inches or something similar, and fabricators use it to produce multiple copies of your board at once. Instead of making each board individually, you design an array of boards on that panel, and then they're routed out or scored and snapped apart after assembly. The key is that the panel size is fixed, so how you arrange your boards on it determines how many you get per panel — and that directly affects the cost per board. Luna: And that's why the per-unit price dropped so much in your quote. You fit more boards on each panel. Lucas: Exactly. In our case, the board was a small, irregular shape — think something like a rounded rectangle with a notch. The first layout only fit maybe eight boards per panel, and there was a lot of wasted space. When we redrew the panel, we managed to fit twelve, which is a fifty percent increase in utilization. And since the fabrication cost per panel is roughly fixed, the cost per board drops proportionally. But there's also assembly and testing benefits, which are often even bigger. Luna: So it's not just about the raw board cost. It's about the whole downstream process. Lucas: Right. When you send a panel to an assembly house, they can place components across the entire panel in one pass. That's huge because the time to load the pick and place machine, the number of solder paste printing steps, the reflow oven cycles — they're all per panel, not per board. So if you double the number of boards per panel, you roughly halve the assembly time per board. And for testing, you can often test multiple boards simultaneously if the panel is designed correctly for the test fixture. Luna: But there must be some trade-offs. You can't just cram as many boards as possible onto the panel and call it a day, right? Lucas: No, absolutely not. There are constraints. First, you have to leave space for the breakaway tabs or V-score lines, which are what allow you to separate the boards after assembly. Those take up space and also add a step in the process. Second, the panel has to fit within the fabricator's maximum size and also meet their minimum spacing rules. And third, if your board has components on both sides, you need to account for the fact that the top and bottom sides are printed and assembled in separate steps, so the panel layout has to accommodate that. Luna: And there's also the issue of board shape. If it's really irregular, you might end up with a lot of wasted space that you can't fill with other boards. Lucas: That's exactly where the cost savings hide. A rectangular board can tile almost perfectly, but a circular or oddly shaped board leaves gaps. Some startups even choose to change their board shape to be more rectangular just to improve panel utilization, which can be a smart trade-off if it doesn't compromise the design. Luna: So what are the typical panel sizes that startups should be thinking about? Lucas: Most fabricators use standard panel sizes, like eighteen by twenty-four inches, or sixteen by eighteen, or sometimes twenty by twenty-four. But they also have minimum order quantities and sometimes charge extra for non-standard sizes. The key is to design your board so that it fits neatly into one of those standard panels with minimal waste. A good rule of thumb is to aim for at least eighty percent utilization, but many startups get to ninety percent or more with some careful layout work. Luna: And when you're doing the panel layout, do you do that yourself, or does the fabricator do it for you? Lucas: It's usually a collaboration. The fabricator will take your individual board design and create the panel array, but they often have default layouts that may not be optimal for your specific board. If you're proactive and provide your own panelization file, you can control the orientation, the spacing, and the breakaway method. That's where the real savings come in. I've seen startups that just let the fabricator do it, and they end up with a layout that's not as efficient as it could be. Luna: So it's another one of those things where a little upfront engineering effort pays off in the long run. Lucas: Exactly. And it's not just about cost. Panelization also affects quality. Because if you have a panel with good rigidity and proper support, you reduce the chance of warping during reflow, which can cause solder defects. And if you're using V-score, you need to make sure the score lines don't interfere with components near the edge. So there's a quality angle too. Luna: That's a good point. And I've also heard that panelization can matter for automated optical inspection, or AOI. Does it? Lucas: Definitely. AOI machines scan the boards to detect defects like missing components or bad solder joints. If your board is on a panel, the AOI can scan multiple boards in one pass, which speeds up inspection. But you have to make sure the panel is designed with fiducial markers so the machine can accurately align to each board. That's another detail that's easy to overlook but can cause headaches in production. Luna: So for a hardware startup that's just starting to scale, what's the first step they should take to optimize their panelization? Lucas: I'd say start by talking to your fabricator early, during the design phase. Ask them for their standard panel sizes and any specific rules they have. Then, in your CAD tool, create a rough panel layout yourself to see how many boards you can fit. You don't need to be an expert, but even a rough estimate can tell you if you're leaving money on the table. Also, consider the board shape and whether you can make it more rectangular without compromising the design. Luna: And there are tools that can help with that automatically, right? Lucas: Yes, some EDA tools have panelization features that can automatically arrange multiple boards on a panel, and there are also online calculators that estimate cost based on board size and quantity. But the most important thing is to understand your own panel's constraints and not just accept the first quote you get. I've seen startups save twenty to forty percent just by iterating on the panel layout a couple of times. Luna: Twenty to forty percent is a significant number. That could be the difference between hitting your target margin or not. Lucas: Absolutely. And it's not just for production. Even for prototyping, if you're ordering a small batch of boards, panelization can reduce the setup cost per board, which makes it more affordable to iterate. But there is a caveat: for very small quantities, like one or two boards, panelization might not be worth it because you're paying for the panel regardless. So the savings really kick in when you're ordering at least a few dozen boards. Luna: So let's talk about the breakaway methods. You mentioned tabs and V-score. What's the difference and when do you use each? Lucas: V-score is a shallow cut on both sides of the panel along a straight line, and you snap the boards apart along that line. It's cheap and works well for rectangular boards, but it leaves a rough edge and you need the boards to be straight. Breakaway tabs use small perforated tabs that are routed around the board, and you break them off with a tool. They allow for more complex shapes and give a cleaner edge, but they take more time and can leave tiny nubs if not done carefully. Luna: And which one is better for a startup that's doing manual assembly? Lucas: If you're hand-soldering or doing low-volume assembly, breakaway tabs are often easier to work with because you can just snap them off with your fingers or a small tool. V-score can be tricky if the board is thin or has components near the score line. But for high-volume production, V-score is faster and more cost-effective. So it really depends on your volume and your board design. Luna: That makes sense. And what about the panel thickness? Does that affect panelization? Lucas: Yes, the standard board thickness is 1.6 millimeters, but you can get thinner or thicker boards. Thinner boards are more flexible and can warp more during reflow, so they need more support in the panel design. Thicker boards are stiffer but take up more space and may be overkill for many applications. Again, it's about balancing cost and reliability. Luna: So let's say I have a product that's going to be produced in volumes of a few hundred. Is panelization still important at that level? Lucas: Definitely. At a few hundred units, you're probably ordering multiple panels, so even a ten percent improvement in panel utilization translates to real dollars. Plus, the assembly time savings are multiplied because you're placing components on all those boards. I'd say panelization is one of the most impactful things you can do for cost reduction at any volume above the prototype stage. Luna: And it's also one of those things that scales with your design. If you plan for panelization from the start, you don't have to redesign later. Lucas: Exactly. That's the key message. Design with panelization in mind from day one. It's not just a manufacturing afterthought. It's a design consideration that affects your board shape, your component placement, and even your test strategy. And the good news is that it doesn't require any special skills — just a bit of awareness and a willingness to talk to your fabricator early. Luna: Well, that's a great practical takeaway. I know I'll be looking at my next panel layout with fresh eyes. Lucas: And that's the kind of thing that can make a real difference to a startup's bottom line. It's not glamorous, but it's the stuff that gets you to profitability. So before we wrap up, I'd love to hear from our listeners: what's the biggest cost-saving tip you've discovered in your own hardware journey? We might cover it in a future episode.