Flex pcb current carrying capacity

ByMayo Chen

The current carrying capacity of a flex PCB depends on various factors such as the thickness and width of the copper traces, the type of substrate material used, and the ambient temperature. Generally, the current carrying capacity of a flex PCB is lower than that of a rigid PCB due to the thinner copper traces and the limited heat dissipation capability of the flexible substrate.

To determine the current carrying capacity of a flex PCB, you can use the IPC-2223 standard, which provides guidelines for calculating the maximum current density of a PCB based on its trace width and thickness. However, it is recommended to consult with a PCB manufacturer or engineer to ensure that the flex PCB can handle the required current without overheating or causing any damage.

How to test the current carrying capacity of the soft board

To test the current carrying capacity of a flex PCB (soft board), you can follow these steps:

  1. Determine the maximum current that the flex PCB is expected to carry based on the circuit design and specifications.
  2. Use a multimeter to measure the resistance of the copper traces on the flex PCB. This will give you an idea of the trace thickness and width, which can help you estimate the current carrying capacity.
  3. Apply a known current to the flex PCB using a power supply or current source. Start with a low current and gradually increase it until you reach the expected maximum current.
  4. Monitor the temperature of the flex PCB using a thermal camera or a temperature sensor. If the temperature exceeds the maximum operating temperature of the substrate material, it may indicate that the current carrying capacity has been exceeded.
  5. Check for any signs of damage or deformation on the flex PCB after the test. If the traces have melted or the substrate has warped, it may indicate that the current carrying capacity was too high.

It is important to note that testing the current carrying capacity of a flex PCB can be challenging due to the flexible nature of the substrate and the limited heat dissipation capability. Therefore, it is recommended to consult with a PCB manufacturer or engineer to ensure that the flex PCB can handle the required current without any issues.

Iflex is Professinal Flex and rigid-flex PCB manufacturer,
welcome to mail us: contact@iflexpcb.com for your any quesiton about Flex and Rigid-Flex PCB.

Contact us now!