High current capacity semiconductor device package and lead frame with large area connection posts and modified outline

• US 6,476,481 B2
• Filed: 06/23/1998
• Issued: 11/05/2002
• Est. Priority Date: 05/05/1998
• Status: Expired due to Term

• Current Assignee: Infineon Technologies Americas Corp. (Infineon Technologies AG)
• Original Assignee: International Rectifier Corporation (Infineon Technologies AG)
• Inventors: Woodworth, Arthur, Ewer, Peter R., Teasdale, Ken
• Primary Examiner(s): Williams, Alexander O.
• Application Number:
  US09/103,035
• Publication Number:
  US 20010054752A1
• Time in Patent Office: 1,596 Days
• Field of Search: 257/666, 257/684, 257/668, 257/675, 257/670, 257/712, 257/713, 257/796, 257/784, 257/786, 257/731, 257/696, 257/698, 257/692, 257/693, 257/690, 257/676, 257/775, 257/787, 174/52.4, 174/52.2, 361/813, 298/27
• US Class Current: 257/696
• CPC Class Codes: H01L 2224/0603 Bonding areas having different sizes, e.g. different heights or widths
• CPC Class Codes: H01L 2224/45012 Cross-sectional shape
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2224/49111 the connectors connecting two common bonding areas, e.g. Litz or braid wires
• CPC Class Codes: H01L 2224/49171 Fan-out arrangements
• CPC Class Codes: H01L 23/49562 for devices being provided for in H01L29/00
• CPC Class Codes: H01L 24/45 of an individual wire connector
• CPC Class Codes: H01L 24/48 of an individual wire connector
• CPC Class Codes: H01L 24/49 of a plurality of wire connectors
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01013 Aluminum [Al]
• CPC Class Codes: H01L 2924/01014 Silicon [Si]
• CPC Class Codes: H01L 2924/01023 Vanadium [V]
• CPC Class Codes: H01L 2924/01028 Nickel [Ni]
• CPC Class Codes: H01L 2924/01029 : Copper [Cu]
• CPC Class Codes: H01L 2924/0103 : Zinc [Zn]
• CPC Class Codes: H01L 2924/01078 : Platinum [Pt]
• CPC Class Codes: H01L 2924/01204 : 4N purity grades, i.e. 99.99%
• CPC Class Codes: H01L 2924/014 : Solder alloys
• CPC Class Codes: H01L 2924/1301 : Thyristor
• CPC Class Codes: H01L 2924/13055 : Insulated gate bipolar transistor [IGBT]
• CPC Class Codes: H01L 2924/13091 : Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01L 2924/181 : Encapsulation
• CPC Class Codes: H01L 2924/1815 : Shape
• CPC Class Codes: H01L 2924/19043 : being a resistor
• CPC Class Codes: H01L 2924/19107 : off-chip wires
• CPC Class Codes: H01L 2924/2076 : equal to or larger than 100 microns
• CPC Class Codes: H01L 2924/30107 : Inductance
• CPC Class Codes: Y10T 29/49121 : Beam lead frame or beam lead device

Abstract

A lead frame for a high power semiconductor device die has three external lead conductors, the outer two of which are reentrantly bent outwardly from the center of the lead frame. When the lead frame is overmolded, the outer conductors are spaced from a central conductor by an increased creepage distance along the plastic surface of the housing. Further, the lead sequence of the exterior leads is gate, source, drain for a power MOSFET. The post area for wire bonding to the source post is enlarged to permit wire bonding with at least three bond wires. The external conductors can be downwardly bent to form a surface mount device. The cross-sectional area of the external conductors is substantially enlarged, although only a small enlargement of the circuit board hole is needed. The package outline has a long flat area centered over the main die area, with a tapered end surface which allows the package to pry open a mounting spring for surface mounting of the package.

Claims

1. A semiconductor device of increased current capacity without an increased size;

said semiconductor device comprising a semiconductor device die;

a plurality of bonding wires;

a die mounting pad and a plurality of parallel spaced external conductors;

at least one of said parallel spaced external conductors having a first bond wire post at one end thereof;

the bottom of said die being fixed to the top surface of said die mounting pad;

a plurality of said bonding wires being bonded at one end thereof to the top surface of said die and at the other end thereof to said bond wire post;

a plastic housing for enclosing said die;

said plurality of spaced conductors extending from the interior of said plastic housing, through a side wall of said housing to the exterior of said housing;

the laterally outermost two of said plurality of spaced external conductors being reentrantly bent and penetrating said side wall of said housing so that said laterally outermost two conductors will have a greater spacing at said side wall than at their free ends thereby increasing the creepage distance along the surface of said side wall.

2. The device of claim 1 wherein said first bond wire post has a width which is at least about one-half the width of said side wall.

3. The device of claim 2 wherein a second one of said external conductors has a second bond wire post for connection to a control electrode on the top surface of said die;

said first bond wire post having one area substantially greater than that of said second bond wire post.

4. The device of claim 1 wherein said die mounting pad is electrically connected to one of said external conductors.

5. The device of claim 1 in which said bond wire post is fixed to a conductor which serves as a power node and has a width of at least about one-half the width of said side wall.