Prototyping is a critical step in any PCB development process. It helps iron out design issues before production, ultimately saving time and money in the long run. However, prototyping can also become unnecessarily expensive if not approached wisely.

Drawing from my experience in inside sales, I’ve put together a list of costly mistakes to avoid during the prototyping phase to help you keep expenses in check.

1. Skip Unnecessary Boilerplate Notes

Unless your boilerplate notes are regularly updated, avoid including them in every submission. Instead, use a checkbox system to indicate only the relevant notes for each order. If there are specific requirements for your prototypes, consider adding them to a separate README file included with your design files. This keeps your documentation clear and relevant while avoiding confusion and potential cost increases.

2. Rethink Via Fill for Early Prototypes

Via fill is a great feature when your boards are headed for assembly, especially if your design requires via-in-pad technology. However, if you’re only prototyping and not sending your boards for professional assembly yet, consider skipping via fill. It’s an expensive and time-consuming process that isn’t always necessary in early iterations. Holding off on via fill until production can significantly reduce costs.

3. Consider a Prototype Solder Stencil

If you're only producing a few prototypes, sending them off for professional assembly may not be the most cost-effective option. Instead, consider investing in a prototype solder stencil kit. For just a few hundred dollars, you can get everything you need to hand-assemble your prototypes, saving money while still ensuring a functional test run.

4. Scale Back Inspection Services

Inspection services are essential for production runs, but do you really need full IPC-6012 Class 3 inspection for just four prototypes? While additional documentation is nice, it’s likely overkill at this stage. Opt for standard inspection instead and save the more rigorous testing for your final production boards.

5. Use a Cost-Effective Surface Finish

Unless your design requires wire bonding, there’s no need to splurge on an expensive ENIG finish for your prototypes. Immersion silver is a great alternative that works well for surface mount components and costs significantly less. Save your ENIG budget for the final revision when the design is fully validated.

Final Thoughts

Navigating the journey from prototype to production can be complex, but making smart financial decisions early on will keep your project on track and within budget. By skipping unnecessary features and choosing cost-effective alternatives where possible, you can prototype efficiently without overspending.