Resin sealing type semiconductor device and method of manufacturing the same, and lead frame
View Patent ↗The invention is directed to firm bonding between semiconductor dies etc bonded to a lead frame and wire-bonding portions of the lead frame by ultrasonic Al wire bonding, and the prevention of shortcircuit between the semiconductor dies etc due to a remaining portion of the outer frame of the lead frame after the outer frame is cut. By extending the wire-bonding portion etc on the lead frame in a wire-bonding direction and connecting the wire-bonding portion etc to the outer frame of the lead frame through a connection lead etc, the ultrasonic vibration force in the ultrasonic Al wire bonding is prevented from dispersing and the Al wire and the wire-bonding portion etc are firmly bonded. The outer frame is cut after a resin sealing process is completed. Even when a portion of the outer frame remains on the side surface of the resin package, connection between the connection lead etc and other hanging lead etc are prevented by providing a notch etc in the outer frame between the connection lead etc and the hanging lead etc.
1. A resin sealing type semiconductor device comprising:
a lead frame comprising an island, a wire-bonding portion located in the island, a first extension portion extending straight from the island in a first direction in plan view of the semiconductor device and a second extension portion extending straight from the island in a second direction in the plan view of the semiconductor device, the first direction being different from the second direction so that the first and second directions are substantially perpendicular to each other;
a semiconductor die die-bonded to the island and wire-bonded to the wire-bonding portion using a wire comprising aluminum or copper; and
a resin package sealing the lead frame and the semiconductor die,
wherein one side edge of the resin package extends in the first direction, and another side edge of the resin package extends in the second direction.
2. The resin sealing type semiconductor device of claim 1 , wherein the wire-bonding portion of the lead frame is connected to an outer frame of the lead frame.
3. A resin sealing type semiconductor device comprising:
a lead frame elongated to have a first side edge and a second side edge in plan view of the semiconductor device, the first side edge being longer than and not parallel to the second side edge;
a semiconductor die that is die-bonded to and wire-bonded to the lead frame; and
a resin package sealing the lead frame and the semiconductor die,
wherein the first side edge of the lead frame is exposed along the resin package, and the exposed portion of the lead frame is separated into two portions by a cut made in the lead frame.
4. The resin sealing type semiconductor device of claim 3 , wherein the lead frame comprises an island to which the semiconductor die is die-bonded and two hanging leads connecting the island and the exposed portion of the lead frame that is an outer frame of the lead frame remaining after a packaging of the semiconductor device, wherein the cut is made between the two hanging leads.
5. A lead frame comprising:
an island;
an outer frame surrounding the island and defining an outer periphery of the lead frame; and
a plurality of connection portions connecting the island and the outer frame,
wherein a notch is formed in the outer frame between two connection portions so as not to cut through the outer frame.
6. The lead frame of claim 5 , wherein the connection portions comprise hanging leads and connection leads that are wider than the hanging leads, and one of the two connection portions is a connection lead.
7. A lead frame comprising:
a first outer frame portion extending in a first direction;
a second outer frame portion extending in a second direction crossing the first direction;
a third outer frame portion extending in the second direction;
a first island and a second island that are disposed in an area defined by the first, second and third outer frame portions;
a plurality of first leads extending from the first island in the second direction;
a plurality of second leads extending from the second island in the second direction; and
a tie bar connecting the second and third outer frame portions,
wherein the first inland is connected to the first outer frame portion by at least one of the first leads, connected to the second outer frame portion by a lead extending in the first direction and connected to the tie bar by at least one of the first leads, and
the second inland is connected to the first outer frame portion by at least one of the second leads, connected to the third outer frame portion by a lead extending in the first direction and connected to the tie bar by at least one of the second leads.