Soldering THT components

Although modern electronics is dominated by SMT, THT components (Through-Hole Technology) still have their place in manufacturing, development and repair.

What are THT components?

Components with wire leads inserted through holes in the board and soldered on the opposite side.

Advantages of THT technology

Very strong mechanically – ideal for connectors, power components and anything exposed to forces.

What equipment do you need?

A soldering station, solder, flux, side cutters and a desoldering pump. Browse the range under soldering equipment.

The right soldering tip

Usually a chisel tip that transfers enough heat – more in how to choose a soldering tip.

Recommended temperatures

Usually 320–360 °C, higher for lead-free – see lead-free soldering.

The correct soldering procedure

Heat the pad and lead together, feed in solder, hold briefly and let it cool without moving.

What does a good joint look like?

Shiny, cone-shaped, evenly wetted – without balls or a matte surface.

Common problems

Cold joints, too much solder and overheated pads. More in the most common soldering mistakes.

Soldering connectors and power components

Massive parts need more heat and a larger tip; preheat the board if necessary.

Quality control

Visual inspection with a magnifier; check for even wetting and a firm connection.

Conclusion

THT soldering is robust and easy to learn. Faulty parts are removed in desoldering a component; find more guides in the ESD Guide.