Investigation of white residue on leadless chip carriers (LCCs) surface-mounted to alumina substrates

Technical Report · Sat Feb 01 00:00:00 EST 1992

OSTI ID:5706050

Adams, B E

A team was formed to resolve a contamination problem of surface-mounted LCCs after the wire brush cleaning operation was discontinued. White residue was appearing on the LCCs after vapor phase soldering. An earlier investigation which led to the brush cleaning suggested PIND test couplant was the source of the contamination. Analysis of the present white material indicated several different contaminants including nylon 6,9, adhesive from the cardboard carriers, skin, tin oxide or tin abieate, alkane hydrocarbons, polystyrene, and a nitrate or carbonate compound. The nylon 6,9 came from the tinning tools and they were removed from the production floor. All other contaminates came from unknown sources. To help minimize the contamination problem, the team recommended washing the LCCs in a Dirl-lum 603 detergent followed with a DI water rinse.

• Research Organization: Allied-Signal Aerospace Co., Kansas City, MO (United States). Kansas City Div.
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00613
• OSTI ID: 5706050
• Report Number(s): KCP-613-4652; ON: DE92008402
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
INTEGRATED CIRCUITS
SURFACE CLEANING
ADHESIVES
ALKANES
ALUMINIUM OXIDES
DETERGENTS
INSPECTION
NYLON
POLYSTYRENE
SKIN
SOLDERING
SUBSTRATES
TIN OXIDES
WASHING
ADDITIVES
ALUMINIUM COMPOUNDS
BODY
CHALCOGENIDES
CLEANING
ELECTRONIC CIRCUITS
EMULSIFIERS
FABRICATION
HYDROCARBONS
JOINING
MATERIALS
MICROELECTRONIC CIRCUITS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANS
OXIDES
OXYGEN COMPOUNDS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYAMIDES
POLYMERS
POLYOLEFINS
POLYVINYLS
SURFACE FINISHING
SURFACTANTS
SYNTHETIC MATERIALS
TIN COMPOUNDS
WELDING
WETTING AGENTS
426000* - Engineering- Components
Electron Devices & Circuits- (1990-)