RoHS Compliance Guide for Electronic Components

The Restriction of Hazardous Substances (RoHS) Directive is a European Union regulation that restricts the use of specific hazardous materials in electrical and electronic equipment (EEE). Originally adopted as Directive 2002/95/EC and later recast as Directive 2011/65/EU (RoHS 2), plus the Delegated Directive (EU) 2015/863 (RoHS 3), the regulation aims to protect human health and the environment by reducing hazardous waste from electronics.

RoHS restricts ten substances: lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (Cr6+), polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), and four phthalates — DEHP, BBP, DBP, and DIBP. Maximum concentration values are set at 0.1% by weight in homogeneous materials for most substances, with cadmium limited to 0.01%.

While RoHS originated in the EU, its influence is global. Similar regulations exist in China (China RoHS II), South Korea, Japan, India, Turkey, and other markets. For electronics companies selling internationally, RoHS compliance is effectively a baseline requirement regardless of where products are manufactured.

RoHS 2 expanded the scope to cover all EEE (with certain exclusions) across 11 product categories, including large and small household appliances, IT equipment, consumer electronics, lighting, medical devices, and monitoring/control instruments. The regulation applies to finished products placed on the EU market, including components and sub-assemblies used in those products.

Certain applications are exempt from RoHS restrictions where technically viable alternatives do not exist. These exemptions are documented in Annexes III and IV of the directive and are subject to periodic review. Examples include lead in high-temperature solders (>85% lead), lead in ceramic or cermet components in specific applications, and mercury in certain lamp types.

Managing exemptions requires careful documentation. For each component or material that relies on a RoHS exemption, you must identify the specific exemption reference, verify its current validity (exemptions have expiration dates and can be revoked), and maintain evidence that the exemption applies to your specific use case.

An effective compliance program starts with your supply chain. Require material declarations from every component supplier using standardized formats like IPC-1752A or IPC-1754. These declarations provide substance-level data that you can validate against RoHS thresholds. Implement incoming inspection procedures to verify compliance claims through periodic testing (XRF screening, wet chemistry analysis).

Centralize all compliance data in a single system of record. When you manage RoHS documentation across scattered spreadsheets, emails, and file shares, gaps emerge. A centralized platform ensures that every component in your BOM has current compliance documentation, and that expiring declarations trigger supplier follow-up before they lapse.

Train your engineering and procurement teams on RoHS requirements so they can make informed decisions during component selection. When an engineer selects a new component, the system should automatically check its RoHS status and flag any issues. Proactive compliance at the design stage is far less expensive than discovering non-compliance during production or — worse — after products have shipped.