Photocoupler

Abstract

Abstract PURPOSE:To prevent the erroneous operation of a photocoupler due to electrostatic coupling by forming an emitter region on the main part of a base region to cover the part. CONSTITUTION:In a structure which has an N type collector region 1, a P<+> type base region 2 and an N<+> type emitter region 3, the region 3 is formed on the part to cover the main part of the region 2. As a result, the capacity CGPB proportional to the surface area of the region 2 is largely reduced, and the influence to the electrostatic coupling corresponding thereto can be remarkably reduced. In this manner, the influence of the coupling in the photocoupler can be removed by this simple structure, and the erroneous operation due to the application of the abrupt pulse voltage can be eliminated.

Inventors

• 👤 Toshibumi Yoshikawa
• 👤 俊文 吉川
• 👤 Hisao Nagao
• 👤 長尾　久夫

Bibliographic Details