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US3566205A Expired / Lapsed US ⏱️ 0.0 years remaining

Packaged high frequency transistor with directly fused contacts

Assignee: Texas Instruments Inc
•
Filing: 1967-07-27
•
Granted: 1971-02-23
•
Expires: 1987-07-27
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Abstract

Abstract A transistor suitable for use in the U.H.F. band and capable of providing power amplification. The transistor incorporates terminations that are directly fused, e.g. in soldering or brazing to respective emitter, base and collector contact surfaces having relatively large areas. In one embodiment the base region is a circular annulus in which are diffused emitter regions spaced around the annulus. The emitter contact is an annulus having radially inward projecting fingers overlying the emitter regions and the base contact is a disc having radially outward projecting fingers interdigitating with the emitter contact fingers. The base and collector terminals have coaxial stems projecting from discs fused to the base and collector contacts and the emitter terminal is an annulus fused to the emitter contact. This provides a package suitable for incorporation into a coaxial line system. Other embodiments incorporate rectangular, platelike terminations and provide packages suitable for direct incorporation into strip line and rectangular waveguide systems.

Inventors

  • 👤 John Siddall Walker
  • 👤 Michael Rupert Platten Young
  • 👤 Gordon Howard Littlejohn
  • 👤 Ian Hambry Morgan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-03 06:10
CPC Classifications
H; H10; H10W; H10W72/00; H10W72/20; H10D; H10D99/00; H10P; H10P95/00; H10W20/00; H10W20/40; H10W20/482; H10W20/484; H10W44/00; H10W44/20; H10W72/90; H10W76/00; H10W76/10; H10W76/12; H10W76/161

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 112 words
A semiconductor device comprising a body of semiconductor material including two active regions exposed at a common surface of said body; first and second low resistance deposited contacts overlying the said active regions and making ohmic contact therewith, said contacts including projecting fingers which interdigitate with each other; first and second electrical terminal members having regions overlying and fused directly to the deposited contacts, said first terminal having a platelike portion cantilevered from said body, said second terminal having two electrically connected platelike portions cantilevered from the body in opposite directions, each transversely of said first terminal member; said terminal members extending in sealed relation through a package containing the semiconductor body.
Claim 2
Dependent Claim 112 words
A semiconductor device comprising a body of semiconductor material including two active regions exposed at a common surface of said body; first and second low resistance deposited contacts overlying the said active regions and making ohmic contact therewith, said contacts including projecting fingers which interdigitate with each other; first and second electrical terminal members having regions overlying and fused directly to the deposited contacts, said first terminal having a platelike portion cantilevered from said body, said second terminal having two electrically connected platelike portions cantilevered from the body in opposite directions, each transversely of said first terminal member; said terminal members extending in sealed relation through a package containing the semiconductor body.
Claim 3
Dependent Claim 15 words
A device according to claim 1, in which the first and second terminals are coplanar.
Claim 4
Dependent Claim 67 words
A device according to claim 1, in which the body includes a third contact deposited on an opposite surface of the body, and connected by a low resistance path to a third active region Of the body, and a third terminal having a platelike portion fused directly to the third contact and cantilevered from the body to extend in an opposite direction to the said first terminal.
Claim 5
Dependent Claim 43 words
A device according to claim 3, in which the first and second terminals are base and emitter terminals respectively and the third terminal is a collector terminal connected to a collector region of the body through a low resistance portion of the body.
Claim 6
Dependent Claim 41 words
A device according to claim 1, in which the contiguous surfaces of the contacts and the respective terminals are of like composition, and in which those surfaces are fused to each other using a fusing material including material of that composition.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-02-22 1974-08-24 1975-02-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-02-22 1978-08-24 1979-02-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-02-22 1982-08-24 1983-02-23 $7700.00 Window Closed / Lapsed

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