US3711752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semiconductor device and method of assembling the same
Assignee: Robert Bosch GmbH
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Filing: 1970-11-23
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Granted: 1973-01-16
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Expires: 1990-11-23
Abstract
Abstract The parts of a semiconductor device are assembled in a composite jig whose base can locate the heat sink and whose parts-receiving block has cavities for the solder, semiconductor pellet and elastic metallic contacts provided with elastic tongues which engage terminals on the exposed surface of the pellet. The contacts are thereupon subjected to elastic deforming stresses to clamp them to the leads of the heat sink and to bias the tongues against the pellet. The thus assembled semiconductor device is withdrawn from the jig and conveyed through a soldering furnace wherein the contacts are bonded to the leads and to the terminals simultaneously with bonding of the pellet to the heat sink.
Inventors
- 👤 J Nier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:27
CPC Classifications
H; H10; H10W; H10W99/00; H10W72/00; H10W72/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
126 words
In a semiconductor device, a combination comprising a metallic plate-like heat sink; at least one lead anchored in, electrically insulated from and extending transversely beyond at least one side of the heat sink; a semiconductor pellet adjacent to said one side of the heat sink and having an exposed surface provided with at least one terminal; and an electric contact of resilient material having a U-shaped first portion including two legs provided with registering openings through which said one lead extends, and a second portion including at least one tongue engaging said terminal, said contact engaging said lead and said terminal in stressed condition, so that said legs clampingly engage said lead and said tongue presses aid pellet against said one side of said heat sink.
Claim 2
Dependent Claim
126 words
In a semiconductor device, a combination comprising a metallic plate-like heat sink; at least one lead anchored in, electrically insulated from and extending transversely beyond at least one side of the heat sink; a semiconductor pellet adjacent to said one side of the heat sink and having an exposed surface provided with at least one terminal; and an electric contact of resilient material having a U-shaped first portion including two legs provided with registering openings through which said one lead extends, and a second portion including at least one tongue engaging said terminal, said contact engaging said lead and said terminal in stressed condition, so that said legs clampingly engage said lead and said tongue presses aid pellet against said one side of said heat sink.
Claim 3
Dependent Claim
25 words
A combination as defined in claim 1, wherein said contact consists of a metallic material which retains its elasticity when heated to a soldering temperature.
Claim 4
Dependent Claim
127 words
A combination as defined in claim 1, wherein the material of said contact is elastic sheet metal and said contact exhibits the following characteristics: composition: Ag 97 Cu3; tensile strength: about 40 Kp/mm2; Vickers hardness HV10: about 115 Kp/mm2; recrystallization temperature: about +600*C.; elasticity modulus: about 5,600 Kp/mm2; linear heat expansion coefficient: about 20 . 10 6 (1/*C.); coated on both sides with a film consisting of Pb 96Sn4 having a thickness of about 40 microns; overall thickness: about 0.15 mm; specific electric resistance: 1.94 . 10 6 Omega cm at 20*C.; temperature coefficient of resistance: about +3.4 . 10 3 * C 1; thermal conductivity: about 3.5 W cm 1 * C. 1; temperature coefficient of thermal conductivity: about +5 . 10 4 * C. 1.
Claim 5
Dependent Claim
32 words
A combination as defined in claim 1, wherein said contact is provided with at least one projection spaced from said openings which is accessible to the jaws of tweezers or analogous tools.
Claim 6
Dependent Claim
20 words
A combination as defined in claim 4, wherein said pellet has a plurality of terminals at said exposed surface thereof.
Claim 7
Dependent Claim
26 words
A combination as defined in claim 5, wherein the second portion of said contact consists of several discrete tongues each engaging a terminal of said pellet.
Claim 8
Dependent Claim
58 words
A combination as defined in claim 5, wherein said tongue is V-shaped and includes a first section extending from one of said legs away from the surface of said pellet, a second section extending toward said surface, and a foot provided at the free end of said second section and lying flat against a terminal of said pellet.
Claim 9
Dependent Claim
32 words
A combination as defined in claim 5, wherein the second portion of said contact comprises at least two tongues located in different planes and each engaging a discrete terminal of said pellet.
Claim 10
Dependent Claim
27 words
A combination as defined in claim 8, wherein all of said tongues bear against the respective terminal with a substantially identical force and independently of each other.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |