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Patent Searching and Data


Title:
LEAD FRAME
Document Type and Number:
Japanese Patent JPH04196574
Kind Code:
A
Abstract:

PURPOSE: To prevent creeping-up of a brazing material onto a hanging lead and to enhance reliability by providing a brazing material reservoir for reserving flowing brazing material when the material overflows on the lead so as to bring a chip into close contact with a die pad.

CONSTITUTION: A brazing material 8 is placed on a die pad 3 to heat the pad 3 to a high temperature thereby to melt the material 8. A chip 5 is placed on the material 8 in this state, and brought into close contact with the pad 3. In this case, since the chip 5 is formed in a shape for pressing the material 8 from above, the material 8 is extended from the chip 5 to flow on the pad 3, the material 8 flows to a brazing material reservoir 9 becoming a further higher temperature on a hanging lead 4, and the material 8 reserved in the reservoir 9 is stopped thereby. Then, bonding pads 6, inner leads 2 or the leads 4 on the chip 5 are wire bonded by wiring 7.


Inventors:
SAKANO RYUICHI
Application Number:
JP33134890A
Publication Date:
July 16, 1992
Filing Date:
November 28, 1990
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H01L21/52; H01L23/50; (IPC1-7): H01L21/52; H01L23/50
Domestic Patent References:
JPS5724555A1982-02-09
JPS594647B21984-01-31
JPS6392048A1988-04-22
Attorney, Agent or Firm:
Hiroshi Murakami (1 outside)