Tatsuya Ohtaka
Hitachi
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Featured researches published by Tatsuya Ohtaka.
electronic components and technology conference | 1997
Mamoru Mita; Gen Murakami; Toyohiko Kumakura; Norio Okabe; Noriaki Taketani; Kazuhisa Hatano; Tatsuya Ohtaka
The Combination Lead Frame/TAB BGA has been studied to improve the manufacturability of TBGA LSI package. Ordinary lead frames and the TAB tape carriers have been applied to make the assembly of TBGA easier. The base technologies, the materials of the lead frame, and the TAB tape were thoroughly applied to the heat spreader and the fine routing flexible substrate. The lead frames as the heat spreader and the tape (manufactured by the line of the TAB tape for wire bonding substrate) are combined with a high thermal resistive adhesive (Tg473K). The solder or metal balls for the surface mounting were previously attached to the ball pads before assembling the die. With this improved Combination Lead Flame/TAB BGA, current assembly houses will never need any other new machines to produce the TBGA.
electronic components and technology conference | 1996
Tatsuya Ohtaka; Y. Kameyama; I. Yamagishi; Takaharu Yonemoto; Takashi Suzumura
Leadframes with heat spreaders have been developed for mounting high power LSI devices, such as MPUs and MPEGs. Power dissipation of this package is from 2 to 3 W. However, there is a great need for less expensive leadframes for Heatspreader-enhanced Quad Flat Packs (HQFPs) for general use. Therefore, we modified the structure of the leadframe for the HQFP and improved the manufacturing to achieve very low-cost leadframes. The features of this new leadframe are as follows: (1) Nearly the same cost as a conventional leadframe with-out a heat spreader. (2) From 2 to 3 W thermal dissipation. (3) Easy wire bonding. (4) High reliability through solder reflow. This leadframe achieves high thermal performance and guarantees high reliability at the least cost.
Archive | 1996
Kazuhisa Hatano; Tatsuya Ohtaka; Takaharu Yonemoto; Osamu Yoshioka; Gen Murakami
Archive | 2001
Tatsuya Ohtaka; Sachio Suzuki
Archive | 2003
Kenji Uchida; Koki Hirasawa; Tatsuya Ohtaka; Kazuhisa Kishino; Sachio Suzuki
Archive | 2006
Akira Yamaura; Yoshikazu Hayakawa; Tatsuya Ohtaka; Takashi Aoyama; Tomiya Abe; Masaaki Shimizu; Manabu Kato
Archive | 2005
Hiroshi Sugimoto; Tatsuya Ohtaka; Shigeharu Takahagi
Archive | 2010
Ryousuke Sakamaki; Akihiro Tanba; Takashi Aoyama; Akio Hattori; Teruji Sato; Tatsuya Ohtaka
Archive | 2006
Tomiya Abe; Takashi Aoyama; Yoshikazu Hayakawa; Manabu Kato; Tatsuya Ohtaka; Masaaki Shimizu; Akira Yamaura
Archive | 2006
Tomiya Abe; Takashi Aoyama; Yoshikazu Hayakawa; Manabu Kato; Tatsuya Ohtaka; Masaaki Shimizu; Akira Yamaura