Combination positive temperature coefficient resistor and metal-

Details Combination positive temperature coefficient resistor and metal- Combination positive temperature coefficient resistor and metal-

1998-08-10

2000-08-08

Lam, Tuan T.

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

327574, 361106, H02H 504

Patent

active

061007455

ABSTRACT:
The present invention sets forth a new device comprising a PTC, and a transistor in direct physical contact with the PTC. The PTC has a first surface and a second surface wherein at least one of the surfaces is substantially flat. Preferably, the transistor comprises a MOSFET coupled to and located on a flat surface of one of the first and second surfaces of the PTC. The device further includes insulating material coupled to the PTC, a conductive pad coupled to the insulating material, and a conductor coupled between the conductive pad and a gate junction of the transistor. A similar conductive pad and conductor arrangement is provided for a source junction of the transistor. The MOSFET is coupled at a drain junction thereof to one of the first and second surfaces of the PTC, and the device includes a non-conductive encapsulating material around at least a portion of the transistor and the PTC. The combined PTC/MOSFET device provides switching and overload protection features. Alternative embodiments set forth multi-transistor arrangements with a PTC.

REFERENCES:
patent: 4717996 (1988-01-01), Bourke et al.
patent: 5381296 (1995-01-01), Ekelund et al.
patent: 5619076 (1997-04-01), Layden et al.
patent: 5666254 (1997-09-01), Thomas et al.
patent: 5757141 (1998-05-01), Wood
patent: 5763929 (1998-06-01), Iwata
patent: 5867008 (1999-02-01), Du et al.

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