Connecting Electrolytic Capacitors to Boards

Here are some basic tips for soldering Electrolytic Capacitors in your projects.

  • Consider the hole position before you design the board and before you begin to place the capacitors. When the circuit board is designed, be sure to allow the exact space for the capacitor leads. Spacing that is too large or too small will cause the mounting to apply undue stress on the leads. This may lead to short circuits, increased current and broken circuits.
  • Do not use excessive force to the terminals and leads. Excessive force applied to the lead wires and terminals may cause the leads and terminals to separate. In turn, this may cause the internal contact to fail.
  • Be mindful of the solder temperature and time of exposure. Keep the soldering irons away from the capacitor's vinyl insulated sleeves. If dipped in a solder bath, keep at less than 200°C and for less than 10 seconds to avoid damaging the capacitor.
  • Clean the circuit board after dipping. Clean the circuit boards to remove excess flux or other material. Capacitors should never be washed or cleaned by solvents like xylene, acetone, trichlorethylene, etc. These solvents may penetrate the sleeve, remove the markings and violate the capacitor seal. Commercial detergents, methanol and isobutanol are some recommended cleaners.