# US 6,294,824 B1 · Bonding support for leads-over-chip process > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,294,824 B1 - Document ID: US6294824B1 - Status: Granted - Kind: B1 - Application number: 09/102,702 - Filed: 1998-06-22 - Granted: 2001-09-25 - Earliest claimed: 1996-01-09 - Assignees: Micron Technology, Inc. - Inventors: Mike Brooks; Alan G. Wood - Web page: https://patentgrep.com/patent/US6294824B1 ## CPC - H10W 70/465: {Bumps or wires} - H10W 70/415: {Leadframe inner leads serving as die pads} - H10W 72/075: {of bond wires} - H10W 72/536: {the connected ends being ball-shaped} - H10W 72/5363: {the connected ends being wedge-shaped} - H10W 72/865: {Die-attach connectors and bond wires} - H10W 72/884: {Die-attach connectors and bond wires} - 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 ## Abstract A method of forming a semiconductor memory device comprises the steps of providing a semiconductor die, forming a temporary protective material over a surface of the die, and attaching the die to a first lead frame portion. Next, a protective material is contacted with a second lead frame portion and, subsequently, the second lead frame portion is electrically connected with the second lead frame portion with bond pads on the first surface of the die with bond wires. Subsequent to electrically connecting the die and the second lead frame portion the protective material is removed. ## Claims ### Claim 1 An in-process semiconductor assembly comprising: a semiconductor wafer section having a plurality of pads thereon; a wafer section support electrically coupled with said pads; a removable protective material interposed between said wafer section support and said wafer section. ### Claim 2 (depends on 1) The apparatus of claim 1 wherein said protective material contacts said wafer section support and said wafer section. ### Claim 3 (depends on 2) The apparatus of claim 2 wherein said protective material contacts a circuit side of said wafer section. ### Claim 4 (depends on 1) The apparatus of claim 1 wherein said protective material is water soluble. ### Claim 5 (depends on 1) The apparatus of claim 1 wherein said protective material is alcohol soluble. ### Claim 6 An in-process semiconductor assembly comprising: a wafer section having a circuit side and a back side opposite said circuit side; a lead frame having first and second portions, wherein said first lead frame portion is attached to said second lead frame portion and said back side of said wafer section is attached to said first lead frame portion; a removable protective material overlying said circuit side of said wafer section and contacting said second lead frame portion. ### Claim 7 (depends on 6) The assembly of claim 6 wherein said contact between said removable protective material and said second lead frame portion is a substantially nonadhesive contact. ### Claim 8 (depends on 6) The assembly of claim 6 wherein said removable protective material is water soluble. ### Claim 9 (depends on 6) The assembly of claim 6 wherein said removable protective material is alcohol soluble. ### Claim 10 (depends on 6) The assembly of claim 6 further comprising: bond pads on said circuit side of said wafer section; bond wires electrically coupling said bond pads with said lead frame. ### Claim 11 An in-process semiconductor assembly comprising: a wafer section having a circuit side with conductive pads thereon; a protective material overlying said circuit side of said wafer section; a lead frame having a first section comprising at least one pin and a second section having at least one hole therein, wherein said wafer section is attached to said first section and said at least one pin extends through said at least one opening. ### Claim 12 (depends on 11) The assembly of claim 11 wherein said second lead frame section nonadhesively contacts said protective material. ### Claim 13 (depends on 11) The assembly of claim 11 wherein said protective material is removable. ### Claim 14 (depends on 11) The assembly of claim 11 wherein said protective material is water soluble. ### Claim 15 (depends on 11) The assembly of claim 11 wherein said protective material is alcohol soluble. ### Claim 16 (depends on 11) The assembly of claim 11 wherein said first lead frame portion is electrically nonconductive and said second lead frame portion is electrically conductive. ### Claim 17 (depends on 11) The assembly of claim 11 wherein said opening is a slot in said second lead frame portion. ### Claim 18 (depends on 11) The assembly of claim 11 wherein said opening is a hole in said second lead frame portion. ### Claim 19 A method for forming a semiconductor assembly comprising the following steps: forming a protective material over a semiconductor wafer section, said wafer section having a plurality of pads; forming an attachment material on at least one of said pads; connecting a lead frame to said wafer section with said attachment material; and contacting said protective material with said lead frame, said contact between said lead frame and said protective material being substantially nonadhesive. ### Claim 20 (depends on 19) The method of claim 19 wherein said attachment material provides, at least temporarily, a sole mechanical attachment between said wafer section and said lead frame. ### Claim 21 (depends on 20) The method of claim 20 wherein said pads are bond pads and wherein said attachment material is conductive.