Consideration of RoHS issues and Tin Whiskers Evaluation
Nemoto, Norio; Nakagawa, Tsuyoshi; Mori, Hiroshi; hanamori, Masaru; Kawada, Yasuhiro; Tamura, Takashi
EU has enacted two directives, RoHS and WEEE, that prohibit the use of Pb, Cd, Cr6+, Hg, PBB and PBDE in products for the EU consumer market since July 2006. One of the key elements in these directives is Pb, which had been widely used in electric components such as solder and parts terminations. Although these regulations only affect products for sale in the EU, many manufacturers in the world have shifted to lead-free products. At present, the products for military and aerospace usage are outside the RoHS directives. But lead-free parts are widely sold in the commercial market along with lead-containing parts. This could induce misuse of the parts and result in a failure in space applications. Purchase of lead containing electrode parts for space applications is becoming increasingly difficult because of the consumer market shift to lead-free parts. JAXA was established the community to address RoHS issues such as lead-free parts, Tin whiskers and Hot Solder Dipping (HSD). Tin whiskers evaluation test of lead-free chip capacitor was performed using thermal shock cycling test method in vacuum and air condition. And Hot solder dipping (HSD) effects of tin whiskers was also evaluated using thermal shock cycling test method. These thermal shock cycling tests was continued until 2,000cycles. In this paper, more detail of JAXA community and test results will be presented.