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Tape automated bonding (TAB) connects a bare semiconductor die to patterned metal leads carried on a flexible polymer tape. The tape’s inner leads bond to the die; its outer leads then connect to a package, substrate, lead frame, or external circuit. This approach can support fine-pitch connections, gang bonding, and temporary electrical test access during assembly.
What tape automated bonding means
TAB is a die-interconnection and assembly process. Instead of connecting a die with individual wires, the process aligns the die’s contact pads or bumps with conductors patterned on a flexible tape carrier.
IEC 60191-5:1997 describes TAB as an assembly process for integrated circuits used without conventional packages, with the silicon chip exposed. That wording describes a particular package context; TAB’s defining feature is the die-to-patterned-tape connection, and implementations can connect the assembly to other package or substrate structures. The IEC description is reproduced on a standards catalog page: IEC 60191-5:1997.
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The precise manufacturing sequence depends on the design and process. A typical flow includes these stages:
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- Prepare individual dies. A wafer is singulated into separate semiconductor dies.
- Index the tape carrier. Flexible tape bearing patterned conductors is moved into position at the bonding station. Registration features such as alignment holes can help position the conductor pattern.
- Align the die and inner leads. The die pads or bumps are lined up with the tape conductors at the die-facing end. These connections are called inner-lead bonds (ILB).
- Bond the inner leads. The selected bonding method joins the aligned contacts. In thermocompression gang bonding, a thermode applies heat and pressure to bond many leads in one operation.
- Test when the process allows. Temporary test pads on the tape can provide electrical access to the die-and-tape assembly.
- Connect the outer leads. The tape conductors’ other ends are joined to the next level, such as a lead frame, package, substrate, or external circuit. These are called outer-lead bonds (OLB).
Not every design uses the same bonding technique or performs testing at the same point. The sequence above describes common functions, not a universal recipe.
What the tape carrier is made of
A common carrier is flexible polyimide film with patterned copper conductors. The conductor pattern routes signals between the die and the next assembly level; alignment features help register the tape, while temporary test pads can support electrical checks.
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The tape may be single-sided, and a cited technical overview also describes constructions with two metal layers. At the die connection, metal bumps or balls—commonly gold or solder in that overview—form the contact sites. Materials and layer construction depend on the particular design.
Why use TAB, and what are its trade-offs?
TAB’s patterned leads can enable fine-pitch bonding and smaller pads, and can place bond pads across more of the die rather than limiting them to its perimeter. The cited industry overview also identifies potential for higher I/O count for a given die size, reduced gold use, and less variation in bonding geometry as advantages. These are possible design benefits, not guarantees for every application.
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- AUTHENTIC SILICON SAMPLE: Real silicon wafer die sample featuring genuine wafer surface patterns, designed for semiconductor learning, research demonstration, and technology display purposes.
- NON-FUNCTIONAL SPECIMEN: This silicon sample is a display and educational specimen only. It is not an electronic component and does not perform computing or electrical functions.
- SEMICONDUCTOR EDUCATION USE: Suitable for classrooms, laboratories, engineering courses, STEM activities, and demonstrations of wafer structures and semiconductor manufacturing concepts.
- TECHNOLOGY DISPLAY ITEM: Ideal for exhibitions, science displays, collections, and demonstrations related to microelectronics and semiconductor technology.
- INDIVIDUAL PACKAGING: Each sample is separately packaged to help maintain surface cleanliness and reduce scratches during storage and handling.
TAB is one option alongside wire bonding and flip-chip bonding. There is no universal winner: the suitable method depends on the package and production requirements.
- Interconnect geometry and pitch: Compare the required contact spacing and where connections need to sit on the die.
- I/O density: Consider how many connections the die and package must support.
- Production flow: Evaluate assembly sequence and throughput, including whether gang bonding fits the line.
- Test access: Determine whether temporary test points on the carrier are useful to the process.
- Package and manufacturing needs: Account for substrate or package design, materials and tooling infrastructure, and rework requirements.
A historical account says TAB use peaked in the 1980s to early 1990s, when fine-pitch gold thermosonic wire-bonding capability and wire-bonding throughput were more limited. That is historical context, not a measure of current adoption or a basis for ranking today’s processes.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.TAB compared with wire bonding
The key distinction is how the die is connected: TAB bonds the die to pre-patterned leads on a flexible tape, while wire bonding uses individual wires between die pads and package contacts. TAB can connect many leads in a gang-bonding operation; the available sources do not establish a current numerical performance comparison or show that either approach is categorically better.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesFor a real design choice, compare pitch, contact layout, I/O needs, assembly flow, test access, package compatibility, tooling, materials, and rework. Those factors are more informative than treating one method as the default winner.
Quick Recap
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- IC Type: Semiconductor
- Each wafer fragment contains visible integrated circuit patterns for demonstration and display purposes only.
- Made from single-crystal silicon wafer material for authentic semiconductor teaching and research.
- Ideal for electronics courses, microfabrication demonstrations, and STEM student projects.
- Also suitable for art installations, photography props, and chip design exhibitions.
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