# US 2014/0196938 A1 · Lead frame

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- Number: US 2014/0196938 A1
- Document ID: US20140196938A1
- Status: Published application
- Kind: A1
- Application number: 14/146,310
- Filed: 2014-01-02
- Published: 2014-07-17
- Earliest claimed: 2013-01-11
- Assignees: Mitsui High-Tec, Inc.
- Applicants: Mitsui High-Tec, Inc.
- Inventors: Takahiro ISHIBASHI
- Web page: https://patentgrep.com/patent/US20140196938A1

## CPC

- H10W 74/014: {using batch processing}
- H05K 1/18: structurally associated with non-printed electric components (H05K1/16 takes precedence)
- H05K 1/181: associated with surface mounted components
- H05K 3/0052: {Depaneling, i.e. dividing a panel into circuit boards; Working of the edges of circuit boards}
- H10W 70/421: {Shapes or dispositions}
- H10W 70/481: {for devices being provided for in groups H10D8/00 - H10D48/00}
- H10W 72/0198: {batch processes}
- H10W 72/884: {Die-attach connectors and bond wires}
- H10W 74/00: Encapsulations, e.g. protective coatings
- H10W 74/111: {the semiconductor body being completely enclosed}
- H10W 74/142: {the encapsulations exposing the passive side of the semiconductor body}
- H10W 90/736: {between a chip and a stacked lead frame, conducting package substrate or heat sink}
- H10W 90/756: {between a chip and a stacked lead frame, conducting package substrate or heat sink}
- H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

A lead frame includes a plurality of unit lead frames arranged in a matrix. Leads of adjacent ones of the unit lead frames are connected via a connecting bar, in which a longitudinal connecting bar and a transverse connecting bar are crossed at a crossing part. The lead frame further includes a dicing part including the connecting bar and a part of the leads, to be cut along a dicing line, a half-etching part formed along the dicing part, and being smaller in width than the dicing part, and a strength retention part formed in the half-etching part and extended from the crossing part of the connecting bar at least to an end lead located closest to the crossing part among the leads of the unit lead frame adjacent to the crossing part.

## Claims

### Claim 1

A lead frame, comprising:
a plurality of unit lead frames arranged in a matrix;
a plurality of leads aligned along sides of each of the plurality of unit lead frames, a rear surface of the leads being exposed;
a connecting bar via which the leads of adjacent ones of the plurality of unit lead frames are connected, the connecting bar including a longitudinal connecting bar, a transverse connecting bar and a crossing part at which the longitudinal connecting bar and the transverse connecting bar are crossed;
a dicing part including the connecting bar and a part of the leads, to be cut along a dicing line;
a half-etching part formed along the dicing part, and being smaller in width than the dicing part; and
a strength retention part formed in the half-etching part and extended from the crossing part of the connecting bar at least to an end lead located closest to the crossing part among the leads of the unit lead frame adjacent to the crossing part.

### Claim 2 (depends on 1)

The lead frame according to claim 1, wherein
the strength retention part includes a first strength retention part formed along a dicing direction of the connecting bar and a second strength retention part formed along the leads, and the second strength retention part is formed between a pair of leads connected to each other via the connecting bar.

### Claim 3 (depends on 2)

The lead frame according to claim 2, wherein
the first strength retention part is formed consecutively to the second strength retention part.

### Claim 4 (depends on 2)

The lead frame according to claim 2, wherein
the first strength retention part has a quarter to half width of the connecting bar.

### Claim 5 (depends on 2)

The lead frame according to claim 2, wherein
the second strength retention part has a quarter to half width of the connecting bar

### Claim 6 (depends on 2)

The lead frame according to claim 2, wherein
a distance between an end of the half-etching part at a side of the first strength retention part and an end of the half-etching part at a side of the lead is 0.5 to 0.75 times larger than a width of the connecting bar.