Stress-free hall-cell package
First Claim
1. A stress-free hall-cell package comprising:
- a. a semiconductor chip having a hall-cell formed therein and lying in one plane, said chip having conductive terminal pads on a surface thereof for providing electrical access to said hall-cell;
b. at least three metal leads, an end portion of each of said leads lying in and defining another plane that is essentially parallel with said one plane;
c. a cup abutting at least one of said metal leads;
d. at least three metal wires each having one end connected to one of said terminal pads and another end connected to one of said leads near said end portion thereof;
e. an insulative elastomeric protective covering being contained in said cup, and completely except at said one end of said wires; and
f. an electrically insulating housing means for encapsulating and providing mechanical support to said cup and to said end portions of said leads.
1 Assignment
0 Petitions
Accused Products
Abstract
A thin stress-free hall-cell package includes a semiconductor hall-cell chip that is completely enveloped by a resilient cushioning material which is in turn held within a cup. The cup is attached to or is a part of at least one of the metal leads. Wires connect the leads to terminal-pads on the chip through the resilient cushioning material. The method for making the package includes providing support for the cup by one or more of the leads, placing the chip in the cup, dispensing a silicone resin into the cup and heat curing the resin. The package is completed with encapsulation of the cup and adjacent lead ends by a hard resin. The cup advantageously has a hole in its bottom such that a chip placed thereover is held in position for wire bonding by evacuating the hole from underneath by means of a vacuum system. A hot pin is then inserted in the hole to elevate the chip, the pin is retracted to be about flush with the inside of the cup bottom and liquid resin dispersed therein and completely envelops the chip. The resin cures locally about the hot pin. The pin is removed and the resin is completely cured in an oven.
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Citations
7 Claims
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1. A stress-free hall-cell package comprising:
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a. a semiconductor chip having a hall-cell formed therein and lying in one plane, said chip having conductive terminal pads on a surface thereof for providing electrical access to said hall-cell; b. at least three metal leads, an end portion of each of said leads lying in and defining another plane that is essentially parallel with said one plane; c. a cup abutting at least one of said metal leads; d. at least three metal wires each having one end connected to one of said terminal pads and another end connected to one of said leads near said end portion thereof; e. an insulative elastomeric protective covering being contained in said cup, and completely except at said one end of said wires; and f. an electrically insulating housing means for encapsulating and providing mechanical support to said cup and to said end portions of said leads. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification