DESIGN TIP: Balanced Circuit Pattern Reduces Premature Failure
The examples show a covercoated circuit pattern in single, double or multilayer flex or rigid flex printed wiring board inner layer applications.
The “poor design” has a major potential flaw:
If the circuit is flexed perpendicular to the conductors repeatedly, stress will occur in the same location causing the isolated conductor to crack prematurely.
The “robust design” has the following advantages:
Since the conductors are routed evenly, an isolated stress condition cannot develop and therefore no premature failure will occur.
**Note: the robust design is absolutely critical in dynamic Flexing applications**