Universal burn-in fixture
AssigneeMCM Industries, Inc.
InventorDavid P. Meany
Life of this patent
Estimating the term…
Abstract
A universal burn-in fixture including a printed circuit board having a plurality of regularly spaced areas and with each area receiving a semiconductor socket and with the socket having lead members for connection to the board through a plurality of holes and with the majority of the holes surrounded by a conductive pad area which form islands and with each pad surrounded by an insulating area and with the remaining portion of the printed circuit board forming a conductive land area and with substantially the entire printed circuit board covered by a resistive coating to produce resistances between each pad and the surrounding land, to provide for desired resistances between a socket lead and the land area. A voltage is coupled to the land area to supply the desired burn-in voltage at the socket leads.
Claims15
A universal burn-in fixture for aging a plurality of semiconductor devices at the same time, and wherein the semiconductor devices may be any one of a plurality of types which are enclosed in a standard package having a plurality of leads in predetermined locations, including,
- a printed circuit board having a layer of conductive material on at least one side of the board,
- the printed circuit board subdivided into a plurality of areas each conforming in size to receive a semiconductor device of standard configuration and with each area containing a plurality of openings conforming in location to the predetermined locations of the plurality of leads for each standard semiconductor package,
- the layer of conductive material formed in a conductive pattern of pads of conductive material spaced from and surrounded by the remaining layer of conductive material and with the pads of conductive material surrounding predetermined ones of the openings, and
- a unitary layer of resistive material covering substantially all of the layer of conductive material and bridging the spacing between the pads of conductive material and the surrounding conductive material to form a separate resistor between each pad and the surrounding conductive material.
A universal burn-in fixture for receiving a plurality of electronic elements including,
- a support member of insulating material,
- a conductive layer supported by the insulating material for receiving the plurality of electronic elements at predetermined positions,
- the conductive layer including a plurality of pads for connection to the electronic elements and with the pads spaced from a surrounding conductive land area of the conductive layer, and
- a unitary layer of resistive material covering substantially all of the conductive layer and bridging the spacing between the pads and the land area to form separate resistors between each pad and the land area.
A support member including a plurality of resistive elements, including
- a support member of insulating material,
- a conductive layer supported by the support member on at least one side of the support member,
- the conductive layer including a plurality of pads and with the pads spaced from at least one conductive land area forming the remaining portion of the conductive layer and with the land area at least partially surrounding the pads, and
- a unitary layer of resistive material covering substantially all of the conductive layer and bridging the spacing between the pads and the land area to form resistors between the pad and the land area.
Dependencies are inferred from the claim text.