Lead-Free and RoHS Compliance
1. There are 6 hazardous substances that must be eliminated from electronic assemblies under Directive 2002/95/EC of the European Parliament. This is commonly referred to as the RoHS directive. The hazardous substances are:Lead (Pb) Cadmium (Cd) Mercury (Hg) Hexavalent Chromium (Cr +6)
Polybrominated Biphenyls (PBB) Polybrominated diphenyl ethers (PBDE)2. All FR-4 and CEM-3 laminates supplied by Universal Printed Circuit Co. are free of these hazardous substances and, therefore, are compliant with the RoHS directive as long as they do not use tin/lead (HASL) plating.
3. As alternatives to HASL, we offer immersion tin, OSP, electrolytic (flash) gold, and immersion gold options. We recommend using flash gold because it has the best shelf life of all of the platings. Immersion gold would be our second choice.4. In order to achieve the UL 94 V-0 flammability requirements, TBBPA (Tetrabromo-bisohenol), which is a halogen compound, has been used for flame-retardants in standard FR-4 and CEM-3. There may be some problems with halogen compounds due to WEEE, but they are not restricted by RoHS. Removal of the halogen compounds MAY be required under the "GREEN" initiative or future changes in RoHS requirements, but we know of no current legislation that would prohibit its use. 5. When switching to no-lead soldering, standard FR-4 and CEM-3 materials may not withstand the higher temperatures required. We offer two other laminates developed by Nan Ya which offer higher glass transition temperatures as well as the elimination of the halogen compounds. They are NPG-TL & NPG-170TL. We have received UL approval and maintain a stock of this material. If you need to switch to a higher temp material, these NPG types are the best way to go.
6. If your drawing specifies RoHS compliance and a temperature requirement that exceeds standard FR-4 material, we will use either NPG-TL & NPG-170TL material (depending on the actual temperature specified).
7. Marking: We are not aware of any regulations requiring specific marking, but the IPC has proposed some standards in IPC-1066. Please contact us if you would like more info.
We hope this provides a clearer picture of the changes that may or may not be required as you move forward with your RoHS compliance efforts.
If you have any questions, please do not hesitate to contact us.