The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1989
Filed:
Oct. 01, 1986
Kueing L Chen, Plano, TX (US);
Roland H Pang, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
Protection against damage due to electrostatic discharge is provided by the addition of elongate conductor ballast resistor strips (18, 20, 22) formed in series with the transistor device (10). The material forming the conductor strips (18, 20, 22) includes a positive temperature coefficient, thereby offsetting the negative temperature coefficient of the semiconductor material forming the transistor (10). Plural conductor strips are arranged in parallel to reduce the overall resistance to the transistor (10). High current density areas are prevented by providing a plurality of sub-transistors (48) formed in plural individual moats (40-46). The individual current paths reduce the formation of filaments caused by the high concentrations of current in a small area.