How to Choose Matte Tin or Bright Tin Plating for Connector Pins?

How to choose between matte tin and bright tin for connector pins? As a pin research and development manufacturer, the surface treatment of pin is very important, because this is the last vital process of product forming. So how to choose matte tin and bright tin plating for connector pins? A lot of connector manufacturers should know this differance. Here our Mingxing Electronic would like to share how to choose matte tin or bright tin plating for connector pins.

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Matte tin plating characteristics: the appearance looks fog and crystallization is relatively rough, which is easy to stay fingerprints. The general thickness in 5um, 8um, or even higher, according to its use plating thickness varies. Matte tin is better than bright tin in terms of solderability and resistance to tin, but it is very resistant to scratches, fingerprints, etc.

Bright tin is brighter, smoother, more crystalline and less prone to fingerprints, and generally has a thickness of 3um or more. Generally pure functional parts will choose matte tin, while those that need to be soldered but are cosmetic parts will choose bright tin.

1.Bright tin uses a light agent and contains more organic matter in the metal, which makes it less solderable; matte tin does not use a light agent and contains less organic matter in the metal, which makes it good solderable.
2.Matte tin is mainly alkaline tin plating, and bright tin is mainly acid bright tin plating. But they are both pure tin plating but have poor low temperature performance. The actual use is found in the mist tin high temperature resistance than the bright tin good, bright tin sometimes in the over tin furnace will produce tin layer melting phenomenon, but the mist tin on some good.
3.The terminal matte tin plating time will also be longer, matte tin more fine, better welding performance, higher temperature resistance.


Post time: Nov-11-2022