Should I choose PET, FPC or PCB as the circuit for the capacitive membrane switch of my Coffee maker controls?

07 Nov, 2023

By hqt


Ever sipped on a cup of joe and wondered how your coffee maker’s touch controls work? Behind that seamless touch is a capacitive membrane switch. And at the heart of this switch lies a critical decision: the choice between PET, FPC, or PCB circuits. Why does it matter, you ask? Let’s dive in!

Understanding the Basics

What are PET, FPC, and PCB?

These acronyms sound like technical mumbo-jumbo, right? PET stands for Polyethylene Terephthalate, FPC for Flexible Printed Circuit, and PCB for Printed Circuit Board. Each of these circuits has its own set of strengths and challenges.

The role of circuits in a capacitive membrane switch

Imagine a circuit as the nervous system of your coffee maker controls. It’s responsible for sending signals when you touch a button or swipe a control. Choosing the right circuit ensures swift and accurate responses.

PET (Polyethylene Terephthalate) Circuits


  • Lightweight and flexible.
  • Cost-effective for mass production.
  • Resistant to environmental changes.


  • Limited to simpler circuit designs.
  • Not as durable as other options.

FPC (Flexible Printed Circuit) Circuits


  • Highly flexible, suitable for intricate designs.
  • Can accommodate more components in a compact space.
  • Resilient and long-lasting.


  • Slightly more expensive than PET.
  • Requires expert handling during installation.

PCB (Printed Circuit Board) Circuits


  • Extremely durable and robust.
  • Ideal for complex circuitry.
  • Long service life.


  • Rigid, not suitable for bendable designs.
  • Can be costlier than the other two options.

Comparison: PET vs. FPC vs. PCB

Each circuit type offers a unique blend of features. For coffee maker controls, you’d ideally want a circuit that’s durable, resistant to heat and moisture, and provides swift responses. Which one checks all the boxes?

Factors to Consider


If you’re someone who uses their coffee maker multiple times a day, durability is key. While PET is decent, PCB stands out in this arena.


On a budget? PET is a winner here. However, remember that sometimes a higher initial investment in FPC or PCB can save costs in the long run.


Want a sleek design with curves? FPC is your best friend. But if design isn’t a concern, PET or PCB can do the trick.


All three circuits perform well, but for intricate designs and swift responses, FPC and PCB have an edge.

Industry Insights

Most high-end coffee makers in the market opt for FPC or PCB circuits, given their reliability and performance. However, for budget models, PET is still a popular choice.


For daily coffee drinkers seeking durability and performance, FPC or PCB is the way to go. But if you’re looking for a budget-friendly option and are okay with a simpler design, PET should serve you well.


The heart of your coffee maker’s touch control, the circuit, plays a pivotal role in its performance. Whether it’s the cost-effective PET, the flexible FPC, or the robust PCB, each has its merits. Evaluate your needs, weigh the pros and cons, and make an informed decision. After all, nothing should stand between you and your perfect cup of coffee, right?


  1. Which circuit type is the most durable?
    • PCB is considered the most durable among the three.
  2. Is PET suitable for high-end coffee makers?
    • While PET is cost-effective, high-end models usually prefer FPC or PCB for better performance and longevity.
  3. Do I need a professional to install these circuits?
    • While PET and PCB are relatively straightforward, FPC might require expert handling during installation.
  4. Can I switch from one circuit type to another?
    • It’s possible, but it would require significant changes in the design and interface of the coffee maker controls.
  5. Why are capacitive membrane switches popular in coffee makers?
    • They offer a sleek design, are easy to clean, and provide quick and accurate touch responses.

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