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PCB Lead Free RoHS Compliant WEEEE from PCBpro-pcb printed circuit boards

Index : PCB Library : Lead Free Materials - Information Before Placing Your Order

Please read this information before placing your order.

Thank you for your interest in RoHS compliant boards. Since this is a new process we want to make sure our customers review all of the necessary information before placing their order.

When placing a lead free order, simply choose the "Silver RoHS" option for plate finish. Also, please review the information below before ordering your lead free boards

Lead Free Material Comparison: Choosing a lead free finish was a long and tedious process for us at Sunstone. However, we wanted to evaluate all of the available options and chose Immersion Silver due to its overall best performance. Please review the information below for a side-by-side comparison of our results.
Final Finish Comparison Matrix	Interpretation	Immersion Silver (IAg)	ENIG (Electroless Ni/Imm Au)	Organic solderability coatings (OSP)	Immersion Tin (ISn)	HASL (no-lead)	HASL (Tin/lead)
Lead free compatible, RoHS compliant	required	yes	yes	yes	yes	yes	no
Solder joint integrity (how good and reliable is the solder joint)	self explanatory	very good *	good	good	good	good	best
Shelf life (with proper storage**)	self explanatory	12 months**	12 months	12 months**	12 months**	12 months	12 months +
Assembly heat cycles (# of passes through reflow)	> is better	multiple	multiple	multiple	multiple	multiple	multiple
Fab thermal shock (thermal shock during PCB fabrication)	very low is best	very low	low *	very low	very low	high	high
Wettable (how easily does the solder flow onto the surface)	self explanatory	very good *	good	good	good	acceptable *	best
Solder paste printability (co-planarity of the finish for fine pitch devices)	self explanatory	excellent	excellent	excellent	excellent	poor	poor
Solder pot compatible (low possibility of solder pot contamination)	desired	yes	monitor Au concentration	yes	yes	yes	no (if using no lead solder pot)
Low contact resistance (resistance of the finish)	yes is good	yes	yes	yes	no	no	no
Aluminum wire bonding (can this finish be used with Al wire bonding)	yes is good	yes	yes	no	no	no	no
Process cost to PCB fabricator	self explanatory	med	high	low	med	high	low
Sources: (1) Cookson Electronics, (*) Sunstone testing data

Questions?
If you have any questions regarding this information or anything about our lead free process, please contact our Lead Free Specialist, Tom Hall. Tom can be contacted at 503-829-9108 or e-mailed to thall@sunstone.com

Thank you and we look forward to your lead free order through Sunstone Circuits.

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