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SnCu For Wave?

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SnCu For Wave? | 11 January, 2006

Is anybody out there using Sn99.3Cu0.7 for wave soldering? How does it look. (Cost is about the same as eutectic 63/37).

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SnCu For Wave? | 11 January, 2006

About SACX307 for wave you can read at post:

As I have heard, in Europe, Germany in particular, several assemblers are using SN100C for wave (also HASL) with success since years ago. SACX307 even if promising well is still less diffused.

I have seen just few samples of PBAs wave soldered with both alloys, but unfortunately I did not get my hands on the process. At first view SN100C looks more satisfactory then SACX307. For sure this is not a good way to assess and compare soldering results (apple to apple). There are many other process variables to keep in consideration like: wave solder parameters set up,kind of flux, component leads finishing, PCB thickness, PCB surface finisching, etc.


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SnCu For Wave? | 11 January, 2006

I heard from Electrovert's engineers that the SnCu alloy has a really tight process window and is not very machine friendly. It is pretty much used exclusively by the consumer electronics folks. They�re always pinching pennies and are running, lets say one DVD model board on Vectra machines so they can dial it in.

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SnCu For Wave? | 11 January, 2006

Yes, I agree Pete. The industry is zeroing in on:

Hi-Rel / Industrial = Tin-copper-silver Consumer / low-end industrial = tin-copper

I worked for a company, directly developing lead free processes for a major consumer electronics manufacturer. When your producing 1 Million assemblies per month in one factory the cost of silver is a concern.

It is true. Tin/Copper does have a tighter window, but didn't we all say that in the early 90's about no-clean flux?

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SnCu For Wave? | 12 January, 2006

I am not too concerned about the cost of silver, SAC305 generated so much dross in our selective solder it was hard to keep the machine running for more than 20 or 30 minutes without fluxing the nozzles and cleaning the pot, and yes, we are using nitrogen.

I have not seen any evidence that SAC305 is more reliable than SN100.

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