DAP-700 Diode Sealing Furnace

SST International's roots go back over fifty years to the original DAP sealer developed by Dix Engineering in 1965 in Costa Mesa, California. The DAP (Diode Assembly Process) sealer was designed to simultaneously perform hermetic glass-to-metal seals on hundreds of axial-leaded diodes per batch. The diode components were loaded into graphite boats which were resistively heated in a vacuum/pressure chamber. The quality of the seals produced far exceeded other methods in use at the time.

In the late 1970's, integrated circuits largely replaced discrete diodes and the demand for DAP sealers diminished. The company was sold, relocated to Downey, California and renamed Scientific Sealing Technology. The new owner focused on finding new applications for the vacuum/pressure/heating technology. Hermetic solder sealing of ceramic IC packages provided a growth opportunity. Meeting new and evolving military specifications for low moisture levels inside the IC package provided a new market opportunity for the old DAP sealer.

For the next twenty years, SST grew its product offerings, broadened its applications portfolio, and expanded into new world markets. The old analog temperature controller gave way to a punch-card programmed DAP-1100, which soon gave way to the CRT display and keypad programming of the DAP-2200. High vacuum systems and wafer bonders evolved from the basic soldering and glass-sealing furnaces. Applications grew in the telecommunications markets for die attach of MMIC (Monolithic Microwave Integrated Circuit) chips and assembly of laser diode packages. New sensor technologies for both commercial and defense relied upon SST's equipment for critical assembly processes.

Model 5100 Vacuum and Pressure Furnace

At the turn of the century, Scientific Sealing Technology became SST International, reflecting the world-wide presence and reputation the company enjoyed. The new 3000 series of furnaces and bonders was released. These utilized modern computer controllers with full data logging and unlimited profiling flexibility. Larger work-area systems were introduced with higher production capabilities including the Model 5100 and the fully automated AVS-4000. The company developed equipment and processes for getter activation and high vacuum sealing of MEMS (Micro-Electro-Mechanical-Systems) packages.

In 2015, SST International became a wholly-owned subsidiary of Palomar Technologies, based in Carlsbad, California. Palomar is the global leader of high-accuracy, large work-area die attach and wire and wedge bond equipment and precision contract assembly services. As SST begins its sixth decade of service to the microelectronics assembly markets, it's partnership with Palomar provides expanded product offerings to customers of both companies, increased product development capabilities, and broader access to world markets.