Patent ID: 8240029

Claim:
A method for forming an isolated inner lead from a leadframe, comprising the steps of: providing a leadframe having a molding area and a die-attaching area disposed inside the molding area, the leadframe comprising: a plurality of leads, each having an inner portion inside the molding area and an external portion extended outside the molding area integrally connected to the inner portion, wherein the inner portion has a first bonding finger at one end thereof; at least a predetermined isolated inner lead completely located inside the molding area and formed from the same metal layer with the inner portions, wherein the isolated inner lead has a second bonding finger and a third bonding finger formed at two opposing ends thereof, wherein the first bonding fingers and the second bonding finger are linearly arranged; an external lead extended outside the molding area, the external lead further being partially located inside the molding area to have a fourth bonding finger adjacent to the third bonding finger, wherein at least one of the inner portions divides the third bonding finger of the isolated inner lead from the fourth bonding finger of the external lead; and a connecting block disposed inside the die-attaching area and formed from the same layer with the inner portions to integrally connect the isolated inner lead to an adjacent one of the inner portions; attaching a first insulating tape and a second insulating tape to the leadframe so that the isolated inner lead and the inner portions are mechanically connected together, wherein the first insulating tape is disposed inside the molding area adjacent to the first bonding fingers and the second bonding finger, and wherein the second insulating tape is disposed inside the molding area adjacent to the third bonding finger and the fourth bonding finger, wherein the connecting block is located between the first insulating tape and the second insulating tape; and removing the connecting block to make the isolated inner lead electrically isolated from the adjacent inner portion.