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Packaging | Lead-Free Status | European Dir. Compliance | What's driving the move | Strategies
Industry Consortia | Lead-Free Reflow Profile | Literature
National Semiconductor
Lead-Free Status
For ordering information please contact your local National Semiconductor sales representative.
This Web page allows you the opportunity to view specifics on the industry move to lead-free electronics, National's lead-free packaging strategy, and National's participation in lead-free consortia. For lead free availability of specific packages see the Selection Guide by Package Type. Click on the underlined titles to move to that section.
The Issue
Due to environmental concerns around the world, the need for lead-free solutions in electronic components and systems is receiving increasing attention within the semiconductor and electronics industries.
National Semiconductor Corp. strives to minimize the amount of disruption that the switch to lead-free products might entail. We look forward to working with our customers to provide you with the most cost-effective and reliable lead-free packaging solution for your needs.
National Semiconductor is currently considering approaches that would help to discontinue the use of lead in our products as well as in the manufacturing processes of our customers. Integration issues of electronics design require that lead-free solutions must be driven across the supply chain.
National Semiconductor's Action
Currently National is an active participant in several industry consortia addressing lead-free processing. These groups are evaluating lead-free solder alloys with lead-free components and printed wiring board finishes. Several of the lead-free solder alloys being proposed require a maximum reflow temperature higher than the current peak temperature for Sn/Pb, which is between 220-235oC.
Impact of 260°C Peak Reflow
One major impact on the packaging industry will be the higher reflow temperature required for lead-free assembly, with 260oC often mentioned as the upper target. The high temperature ensures that all the components on a fully populated board will reach the melting temperature of the lead-free solder. A majority of plastic packages will have difficulty meeting such a constraint at JEDEC-defined moisture sensitivity levels 1 and 2. Currently, certain small packages such as SOP (Small Outline Packages) and TSSOP (Thin Shrink Small Outline Packages) can withstand the thermal strain without suffering from interfacial delamination, popcorn-induced cracking, or warping. However, larger packages will not meet this requirement. Their JEDEC moisture sensitivity level classification will most likely be downgraded by as many as two levels.
Packaging | Lead-Free Status | European Dir. Compliance | What's driving the move | Strategies
Industry Consortia | Lead-Free Reflow Profile | Literature
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