Stress-free hall-cell package

Details Stress-free hall-cell package Stress-free hall-cell package

1975-06-30

1977-09-13

Smith, Jr., David

Electricity: electrical systems and devices

Miscellaneous

174 52PE, H05K 104

Patent

active

040486702

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.

REFERENCES:
patent: 2906931 (1959-09-01), Armstrong
patent: 2915684 (1959-12-01), Halla et al.
patent: 3441813 (1969-04-01), Takatsuka et al.
patent: 3568012 (1971-03-01), Ernst et al.
patent: 3659164 (1972-04-01), Gaylor
patent: 3689864 (1972-09-01), Ishihama et al.
patent: 3706840 (1972-12-01), Moyle
patent: 3742599 (1973-07-01), Desmond et al.
patent: 3778685 (1973-12-01), Kennedy
patent: 3820237 (1974-06-01), Effer

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