All About Flex: Embracing the Mess

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Marketing in the world of printed circuits is an important discipline, but I have learned it is better to be prepared with a nimble reaction than to expect the marketing department to consistently be successful in predicting the future. The path to the goal is often achieved much more quickly by making an early decision followed by a course correction rather than waiting for all the information. Several related factoids characterize the markets for flexible circuits and flexible heaters:

  1. We live in a world of “time based competition.” Being faster to market can be more profitable than being better.
  2. Customers’ needs many times don’t fit within the supplier’s existing/proven/Six-Sigma capabilities.
  3. Technology and markets move quickly, rewarding suppliers that respond rapidly.
  4. Customers give suppliers money to figure things out.

The myriad of electronic applications drive flexible circuit product configurations and constructions spanning broad engineering imaginations. Circuits that require controlled impedance push trace widths down, and copper thicknesses increasingly thinner, with .0007” copper a common specification. These applications also tend to drive film substrates thicker to increase separation distance between signals and ground planes. Circuitry intended to carry heavy current pushes copper the opposite direction, sometimes involving metal thicknesses in excess of .010”. These circuits tend to stretch the definition of the word flexible.

Product configuration selections can also involve adding copper layers to make multilayer structures, plating multiple surface treatments for solder pads vs. switch contact regions, attaching selective stiffeners for mechanical and component support, and orientation of copper grain to properly orient circuit traces in applications requiring dynamic flexing. Requirements for optimizing component attachment create an additional complexity dimension as nesting circuits for material usage competes with assembly panelization requirements. These seemingly endless permutations of “want to have” vs. “need to have” requirements can drive mushrooming product features, untested manufacturing processes, and unique routing sequences. It can tax the creativity of the best product and applications engineers. What a mess!

But it is a wonderful mess. Complexity makes sourcing parts overseas, across multiple time zones and language barriers, a very risky proposition. The world of flexible circuit manufacturing involves custom engineered parts with unique performance requirements. Every application is different. The kiss of death on most any part number is when someone states the circuit is a “no brainer.” When I hear this, it is generally time to get material ready for a restart. In an attempt to deal with the mess, the manufacturer is tempted to “standardize” their offering, often defined by comfortable or existing manufacturing capabilities. Isn’t the solution to stop building the oddball parts? Or define a niche product offering so resources can be focused? Maybe, but the business world is littered with companies that have disappeared because they were too restrictive in their willingness to change. Attempting to put in systems or procedures to deal with the complexity is noble, and existing procedures always deserve challenge, but new rules and procedures should be considered as part of a continuous improvement project rather than an end state. Change takes us out of our comfort zone, it is difficult…and often it is absolutely necessary.


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