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No clean and 100 Mbps Fast Ethernet Transceiver

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#56752

No clean and 100 Mbps Fast Ethernet Transceiver | 30 September, 2008

Anyone using a No-clean solder paste on a pcb with a 100 Mbps Ethernet chip?

Will the residue cause any signal degradation?

Any issues with a no-clean solder paste and 1000 Mbps Gigabit Ethernet?

Device: National Semiconductor DP83848 10/100 Mbps Ethernet Transceiver (48-LQFP) Paste: AIM NC254 No-clean solder paste Clock speed: 50MHz

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#56754

No clean and 100 Mbps Fast Ethernet Transceiver | 30 September, 2008

How do you normally solder it?

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#56758

No clean and 100 Mbps Fast Ethernet Transceiver | 30 September, 2008

A water soluble solder paste (AIM WS483), reflow and wash. We are considering using AIM NC254 No-clean solder paste to eliminate the wash step.

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#56762

No clean and 100 Mbps Fast Ethernet Transceiver | 30 September, 2008

I would think if the product can take wash, it could take no-clean. Unless it has sensitive devices susceptible to leakage.

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#56764

No clean and 100 Mbps Fast Ethernet Transceiver | 30 September, 2008

Residues from different no-clean fluxes produce different levels of variation in RF circuits. Some no-clean fluxes work fine. Following this, a no-clean flux can produce different levels of variation in RF circuits depending on the process setup.

Often the data sheets for solder paste with no-clean flux aimed at RF applications say, "This material has been utilized on various assemblies with RF designs without cleaning; however, the compatibility of flux residues on RF assemblies is strongly dependent upon circuitry design."

The tech sheet from your AIM NC254 No-clean solder paste gives no indication that it can spell RF, even if you spotted it the "R".

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#56767

No clean and 100 Mbps Fast Ethernet Transceiver | 1 October, 2008

We built tens of thousands of boards with transeivers on them with a no clean process.Never had any problems with the flux residue in relationship to board performance.

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