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A New LTCC with Pb-Free Resistor System for ECU Substrate
Technical Paper
2005-01-1947
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A new LTCC (Low Temperature Co-fired Ceramics) substrate material has been developed for automotive applications used for harsh environment ECU (Electronic Control Unit). Features of the LTCC include high mechanical strength, high dimensional tolerance (+/- 0.1 %), low conductor resistance (2 mΩ / square), and Pb-free thick film resistor systems on the LTCC. These characteristics of the LTCC substrate are suitable for automotive harsh environment applications. Surface conductors are completely covered with Ni/Au plating, which provide sufficient wire bondability for both Au and Al wires. The resistor system consists of Pb-free RuO2 resistor and Pb-free over coated glass which provides protection. Low ohm resistor also consists of Pb-free Ag/Pd material. All of the resistors can be trimmed by laser with their resistances controlled within +/- 1 %. The resistors have less than 1% drift after 3,000 temperature cycles at -40 and 150 degree C condition. This resistor system and substrate meet a durability requirements for automotive applications.
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Authors
- Kouji Yamamoto - Corporate Ceramic Packages Division, Kyocera Corporation
- Koichi Nakahara - Corporate Ceramic Packages Division, Kyocera Corporation
- Hiroshi Makino - Corporate Ceramic Packages Division, Kyocera Corporation
- Shingo Sato - Corporate Ceramic Packages Division, Kyocera Corporation
- Tetsuo Hirakawa - Corporate Ceramic Packages Division, Kyocera Corporation
Topic
Citation
Yamamoto, K., Nakahara, K., Makino, H., Sato, S. et al., "A New LTCC with Pb-Free Resistor System for ECU Substrate," SAE Technical Paper 2005-01-1947, 2005, https://doi.org/10.4271/2005-01-1947.Also In
Automotive Electronics on CD-ROM from the SAE 2005 World Congress
Number: SP-1980CD; Published: 2005-04-11
Number: SP-1980CD; Published: 2005-04-11
Systems Engineering, Electronics Simulation, Advanced Electronics Packaging, and Electromagnetic Compatibility
Number: SP-1926; Published: 2005-04-11
Number: SP-1926; Published: 2005-04-11
References
- Yamaguchi T. Kanai K. “Mechanism of TCR Modification by Cu- and Mn- oxides in RuO 2 -Glass Thick Film Resistors,” Proceedings of the International Symposium on Microelectronics 1992
- Kim Yong Tae “Achievement of zero temperature coefficient of resistance with RuO x thin film resistors,” Applied Physics Letters 70 2 1996
- Abe O. Taketa Y. Haradome M. “The Relation between Resistance and TCR of RuO 2 Thick Film Resistors,” Denki Gakkai-shi 109 4 1997