FPCs (Flexible Printed Circuit Boards) can be categorized by their structure and complexity. Common types include single-layer, double-layer, and multi-layer flexible circuits. There is also a hybrid design called rigid-flex, which combines both flexible and rigid PCBs in the same structure.
At a basic level, FPCs and PCBs are very similar in both function and structure. Whether it’s an FPC or a PCB, both use copper traces on the surface—and sometimes inside the board—to carry electrical signals.
The biggest difference between them lies in the base material.
A traditional PCB uses a glass-fiber–based substrate, which makes the board hard and rigid.
An FPC, on the other hand, is mainly made from polyimide (PI) or Polyester (PET). You can think of it as something closer to thick paper: flat, thin, flexible, and bendable.
Have you ever been in this situation? It’s late at night, you’re working overtime, and suddenly your manager drops a pile of expired components or badly out-of-spec parts on your desk and says, “The customer needs this shipped urgently—just sign a waiver and go home!” Have you ever faced that moment? And after you sign the waiver, if something goes wrong, who actually takes the blame?
Workingbear remembers when he first entered the electronics industry as a junior product or process engineer. The first time colleagues from Quality and Production asked him to “waive” a product, He just froze on the spot. He had no idea what they were talking about—and even got laughed at by the line supervisor.
Workingbear has spent quite some time in the industry, but only recently heard the term SKU for the first time. In practice, people usually just say “SKU”. At first, Workingbear had no idea what SKU meant—not even how to spell it. Asking colleagues didn’t help either. Everyone just said they kept hearing this term from the U.S. headquarters.
Many component suppliers work extremely hard to get into certain companies as approved suppliers. Playing the “pretty salesperson card” is a common tactic—while engineers may appreciate it, most of the time it still doesn’t open the door. So where does the problem really lie? And how should sales actually approach this? This article looks at the topic of becoming a 2nd-source supplier purely from an engineer’s point of view. In reality, things can be even more complicated.
