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Flip chip, also known as controlled collapse chip connection or its abbreviation, C4, [1] is a method for interconnecting dies such as semiconductor devices, IC chips, integrated passive devices and microelectromechanical systems (MEMS), to external circuitry with solder bumps that have been deposited onto the chip pads.
Drawing of a tape-automated bonding carrier and definitions of various parts of the TAB assembly. Tape-automated bonding (TAB) is a process that places bare semiconductor chips (dies) like integrated circuits onto a flexible circuit board (FPC) by attaching them to fine conductors in a polyamide or polyimide (like trade names Kapton or UPILEX) film carrier.
Underside of an 80486 with lid removed shows die and wire bonded connections. The chip can be mounted either on the top or the bottom (the pinned side). Connections can be made either by wire bonding or through flip chip mounting. Typically, PGA packages use wire bonding when the chip is mounted on the pinned side, and flip chip construction ...
Wire bonding is a method of making interconnections between an integrated circuit (IC) or other semiconductor device and its packaging during semiconductor device fabrication. Wire bonding can also be used to connect an IC to other electronics or to connect from one printed circuit board (PCB) to another, although these are less common. Wire ...
In "wire bonding", the chip is attached to the board with an adhesive. Each pad on the device is connected with a fine wire lead that is welded to the pad and to the circuit board. This is similar to the way that an integrated circuit is connected to its lead frame, but instead the chip is wire-bonded directly to the circuit board. [3]
Wafer bumping (for flip chip BGA (ball grid array), and WLCSP packages) Die cutting or wafer dicing; IC packaging. Die attachment (The die is attached to a leadframe using conductive paste or die attach film. [136] [137]) IC bonding: Wire bonding, thermosonic bonding, flip chip or tape automated bonding (TAB)
In flip chip systems the IC is connected by solder bumps to a substrate. In beam-lead technology, the metallized pads that would be used for wire bonding connections in a conventional chip are thickened and extended to allow external connections to the circuit. Assemblies using "bare" chips have additional packaging or filling with epoxy to ...
These techniques are usually used when the die will be wire bonded; dies with flip chip technology do not use these attachment techniques. [15] [16] IC bonding is also known as die bonding, die attach, and die mount. [17] The following operations are performed at the packaging stage, as broken down into bonding, encapsulation, and wafer bonding ...