Stiffeners requirement for flexible PCB design

gigio
Mon, 14 Jul 2025 15:01:40 +0000
Design and Layout

I’m prototyping a 250 mm × 6 mm flexible PCB that carries three 3 × 3 mm DFN packages (hand-assembled). All DFNs will be on the top side; any stiffeners would go on the bottom, opposite the components. Design guides from many printed circuit board manufacturers insist on stiffeners under SMT devices, but for this tiny length/width I’d like to keep the flexible PCB fully flexible, is it absolutely necessary?

6 posts - 3 participants