Patent ID: 6265277
Filing Date: 2001-07-24
Classification: H01L

Abstract:
A method of making a protective bipolar transistor for protection against electrostatic discharges in an integrated circuit, comprising steps of, in the following order:a) masking a portion of a surface of a semiconductor substrate for the bipolar transistor, the masking comprising steps of:first, performing an overall contour masking operation for forming a field oxide around an active zone encompassing the implantation zones andsecond, performing a masking operation, within this active zone, to form a separation zone between two implantation zones,b) implanting the implantation zones with impurities to selectively dope the implantation zones, andc) covering a part of the implantation zones and of the separation zone with a deposited insulator, this insulator being deposited against the surface of the semiconductor substrate in the separation zone.