Overvoltage resistor and method for its manufacture

Details Overvoltage resistor and method for its manufacture Overvoltage resistor and method for its manufacture

1989-04-13

1991-02-26

Reynolds, Bruce A.

Electrical resistors

With base extending along resistance element

338333, 338252, 357 51, H01C 1012, H01C 102, H01C 712

Patent

active

049965123

ABSTRACT:
An overvoltage resistor formed in the substrate semiconductor material of an integrated circuit. The overvoltage resistor is formed from a resistive layer formed over a well of a semiconductor material having a conductivity type which is opposite to the conductivity type of the substrate material. The overvoltage resistor is not connected to the voltage supplies of the integrated circuit, thereby eliminating the virtual pn-diode which would otherwise be formed between the well and the substrate and allowing the overvoltage resistor to protect the integrated circuit from voltages outside the range of supply voltages.

REFERENCES:
patent: 4228451 (1980-10-01), Priel et al.
patent: 4720686 (1988-01-01), Westwick
patent: 4835416 (1989-05-01), Miller

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