The Restriction of Hazardous Substances (RoHS) directive, a European project meant to decrease the environmental impact on electronic or electrical products within the waste stream and enhance the recyclability of waste. Its initiative is to create electronic and electrical items that are sold in Europe to free from hazardous substances as of July 1, 2006. What this means is all businesses that manufacture, import or rebrand electronic equipment destined for Europe must ensure their products adhere to RoHS guidelines.
Some manufacturers may find complying with SMT Terminal Block costly and complex, but it may ultimately enable them to within the long run since there certain US states are passing their particular ROHS regulations including SB20 and SB40 in California.
The Waste and Electrical Electronic Equipment (WEEE) directive, the catalyst behind RoHS, requires those that produce electronic equipment to take on the responsibility of recycling and/or recovering their goods.
Breakdown of the RoHS Directive along with its Requirements: Sometimes wrongly identified as the movement for “lead-free” electronic production, the RoHS command concentrates on six substances. Lead, an essential issue, and five other substances included in the directive. The others include Hexavalent Chromium, Cadmium, Mercury, PBBs and PBDEs.
Banned/Restricted Substance Use/Where Found in Electronics
• Yellow pigments, phosphorescent coatings, paints, cadmium batteries, plastic additives, especially PVC and LEDs/detectors/devices.
• Lamps, lighting/bulbs (scanners, displays, projectors), pigments, Mercury Switches, paints and polyurethane materials (high gloss windows)
• Alloys, Hexavalent Chromium Metal finishes for deterioration protection- Chasses fastener- aluminum conversion coatings
• Flame retardants such as cables, housings, plastics, connectors and paints, (PBBs) Polybrominated Byphenyls
• (PBDE) Polybrominated Diphenyl Ethers
• PVC cables- UV/heat stabilizers, chasses, washers, metal parts- Lead solder and interconnect paints, pigments, batteries, discrete components, sealing glasses, CRT glass, and piezoelectric devices
Who Must Comply and What Products Can It Cover? Plug In Terminal Block regulations add a wide class of merchandise, including toys, sports, leisure, medical equipment, monitoring and control instruments, electrical/electronic instruments plus it/Telecom and consumer equipment.
Producers may want to make changes to product design stipulations and command different production processes for your subassemblies and components they normally use within their products. The burden to comply lies with the producers, so they must direct the actions of PCB fabrication, materials, assembly, component as well as other supplies to make certain everything contributes properly to end-product compliance.
Product Exceptions. Production exceptions include industrial tools, medical equipment and replacement parts. Producers can supply “original equipment” or non-conforming replacement parts to correct a product sold to the market before the RoHS took effect. However, they cannot use non-conforming replacement parts to correct conforming parts.
Typical Producer Compliance Sequence. Producers must revisit all existing product designs and specifications and go ahead and take necessary steps to take the merchandise into compliance. Meanwhile, you may prepare specifications for new products at the beginning of the item development stage to make sure they adhere to RoHS. This method may take weeks or months of work.
The Impact on PCB’s. Even though lead stands one of the six substances restricted, it is a main concern in Printed Circuit Board assembly. To comply with RoHS, PCBs have to make the transition to lead-free solders materials. Many other materials found in PCBs will require replacement to conform to RoHS.
For many years the electronic industries have tried tin/lead solder to join the ingredients for the printed circuit boards. The board fabricators also have used tin/lead solders as being a surface finish to safeguard the copper from corrosion. The 63/37 tin lead ratio of solder fit well inside the assembly thermal parameters and also the physical limitations from the base materials. RoHS requirements have changed the rules! Using the new directive, tin lead solders usually are not allowed and for that reason major changes are needed within the printed circuit board fabrication and assembly arenas to adapt for this. Companies have addressed these concerns in a manner that is good for the assembler and the end user of the printed circuit boards we manufacture. Our lead free boards are produced with laminate that have a greater Td (decomposition temperature) to withstand the increased temperature and dwell times required during assembly. The plating finishes we can offer eqrfdn also Plug In Terminal Block compatible. Typically the most commonly used lead free material is Isola IS410 and the lead-free finishes like immersion gold, immersion silver, immersion white tin or Lead free HASL (using SN100CL lead free solder from Florida CirTech).