Making SIP manufacturing defects a thing of the past

2nd July 2018
Posted By : Alex Lynn
Making SIP manufacturing defects a thing of the past

A new water soluble ultra fine pitch Solderpaste, which significantly reduces defects for system-in-package manufacturers has been released by Heraeus Electronics. The spatter-free type 7 (2~11um) solder paste for fine pitch applications is a high-performing paste which enables manufacturers to greatly reduce defects such as solder balling and solder beading.

The paste will be featured at the Semicon West 2018 conference and exhibition, taking place 10th-12th July at the Moscone Centre in San Francisco.

The type 6 (5~15um) version of this paste, which was introduced to the advanced packaging market in 2017, is now in high volume production and suited for wireless and Bluetooth applications. The new type 7 version in the Heraeus WS5112 series provides superior performance to meet the demanding technical requirements of semiconductor packaging manufacturers, wafer bumping manufacturers and fabless design houses. Its ability to deliver splash and splatter free performance is the result of the company’s Welco solder powder and flux platform.

Welco is a proprietary method of producing round shaped solder powder with low oxide content. It is an in process control method of solder powder manufacturing where no sieving is required to meet the powder size ranges as defined by IPC standards. Powders are fully protected from exposure to air or oxygen at elevated temperature, oxides formation on the surface of the powder is kept to a minimum.

The unique WS5112 flux platform was developed in house at Heraeus Advanced Packaging product development facilities in Singapore. The innovative formulation of the flux results in highly consistency solder volume over printing life. With system-in-package applications, solder beads defects are often found on wire bonding pads and under passive components and flip chips. Using carefully selected polymers, WS5112 has no or minimal solder splashing or splattering during the reflow process. Customer feedback indicates that solder beads formation was greatly reduced when using WS5112 solder paste.

Li-san Chan, Assembly Materials Advanced Packaging Global Product Manager for Heraeus Electronics, stated, “As back end manufacturing continues to move toward miniaturisation, solder materials have to perform flawlessly. Our Type 7 WS5112 solder paste eliminates the costly production line delays and package defects caused by spatter-prone, under-performing solder pastes.”

Heraeus Electronics will be exhibiting at Semicon West 2018 in San Francisco, 10th-12th July, booth 2005.

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