Electrostatic discharge protection device
AssigneeMotorola, Inc.
InventorsRoger Countryman, Gianfranco Gerosa, Horacio Mendez
Life of this patent
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Abstract
An electrostatic discharge protection device (12) may be fabricated below a wirebond pad (20) to reduce the area impact upon the circuit (10) which incorporates the device. The electrostatic discharge protection device has one or more diodes (13) formed below the wirebond pad. The connections to and from the diodes are by a one or more sets of strips (46). The silicon dioxide formed in the gaps between the strips transfers the downward force exerted during wirebonding to the substrate with causing interlayer delamination.
Claims10
An electrostatic protection device for use below a wirebond pad comprising:
- a first well of a first conductivity type formed in a substrate the first well located below and within the lateral confines of the wirebond pad;
- a first junction formed in the first well, the first junction of a second conductivity type opposite to the first conductivity type;
- a first ohmic contact formed in the first well, the first ohmic contact of the first conductivity type;
- and
- a first plurality of conductive strips, a first end of each of the first plurality of conductive strips coupled to a wirebond pad, a second end of each of the first plurality of conductive strips coupled to the first junction.
An electrostatic protection device for use below a wirebond pad comprising:
- N wells of a first conductivity type formed in a substrate, where N is an integer;
- N junctions of a second conductivity type, an ith one of the N junctions formed in an ith one of the N wells, where i is an integer index ranging from 1 to N, the second conductivity type opposite to the first conductivity type;
- N ohmic contacts of the first conductivity type, an ith one of the N ohmic contacts formed in the ith one of the N wells;
- a first plurality of conductive strips, a first end of each of the first plurality of conductive strips coupled to a wirebond pad, a second end of each of the first plurality of conductive strips coupled to a first one of the N junctions;
- and
- N-1 pluralities of conductive strips, a first end of an ith one of the N-1 pluralities of conductive strips coupled to the first ohmic contact for i=1, a first end of the ith one of the N-1 pluralities of conductive strips coupled to an (i-1)th one of the N ohmic contacts for i>1, a second end of the ith one of the N-1 pluralities of conductive strips coupled to an ith one of the N junctions.
Dependencies are inferred from the claim text.