Fluxless TCB vs TCB
22 February 2025
As interconnection pitches shrink below 10µm for advanced logic and memory applications, fluxless TCB solves the issues that standard TCB encounters with the flux.
Table of Contents
What Is a Microbump in Semiconductors?
Microbumps are small, raised metal bumps or spheres that connect the chip with the printed circuit board (PCB). In multichip modules they also connect the different layers of the chip. Microbumps are made of conductive materials, typically metals like copper. This reduces the resistance in the interconnects, ensuring that signals travel quickly and with minimal loss of energy.
They serve as conduits for electrical signals to travel from one part of the chip to another. This is essential for different components of the chip to communicate and coordinate their functions. With the increasing demand for smaller and more powerful electronic devices, microbumps enable the creation of high-density packaging. They allow for multiple layers of circuits to be stacked on top of each other, effectively maximizing the use of available space on the chip.
Efficient heat dissipation is crucial in semiconductor devices to prevent overheating. Microbumps can also serve as thermal interfaces, helping to transfer excess heat away from the chip.
How Small Are Microbumps?
These tiny metal structures are typically measured in micrometers (µm, one-thousandth of a millimeter) or even nanometers (nm, one-millionth of a millimeter).
To put this into perspective, a microbump of 1µm would be smaller than the width of a human hair. In advanced semiconductor technology, microbumps can be even smaller, in the nanometer range. A microbump in the nm range would be in the scale of atoms and molecules, making them extremely small.
What Chip Technologies Use Microbumps?
- Flip Chip Packaging: Flip chip technology involves attaching semiconductor chips directly to a substrate using microbumps, enabling shorter electrical pathways and better heat dissipation.
- 3D Integrated Circuits (3D ICs): Microbumps are instrumental in stacking multiple semiconductor layers on top of each other, creating compact 3D integrated circuits that save space and enhance performance.
- System-in-Package (SiP): SiP technology integrates multiple chips, such as processors and memory, into a single package using microbumps for interconnection.
- Wafer-Level Packaging (WLP): Microbumps are used to connect chips directly to the wafer, reducing the need for individual packaging of each chip.
- Multi-Chip Modules (MCMs): In MCMs, microbumps facilitate the interconnection of multiple chips within a single module, optimizing space and performance.
- Fan-Out Wafer-Level Packaging (FO-WLP): FO-WLP uses microbumps to redistribute connections across the chip’s surface, enabling higher I/O density and more compact designs.
- Advanced Packaging: advanced packaging uses microbumps, allowing for precise connections in small, sensitive devices.
Related Posts
Evolution of Metal Pitch in Semiconductor Transistors
23 May 2024
The metal pitch refers to the distance between the centers of two adjacent metal interconnect lines on an integrated circuit (IC). Since transistors evolved into 3D strucrures, this measurement has lost significance.
Front-end vs Back-end in Semiconductors: 7 Differences
21 April 2024
The front-end and back-end are highly interdependent. A constant feedback loop between front and back-end engineers is necessary to improve manufacturing yields.
Through-Silicon Via: Interconnecting Chip Layers
4 April 2024
Built directly into the silicon, through silicon vias (TSV) facilitate 3D IC integration and allow for more compact packaging. They have become the default solution to interconnect different chip layers or to stack chips vertically.
SiC vs GaN Transistors
16 February 2024
Silicon carbide (SiC) is used in electric vehicles due to its wide bandgap and great thermal conductivity. Gallium nitride (GaN) shares many characteristics with SiC while also minimizing RF noise.
Will GPUs Replace CPUs? Understanding Core Differences
3 January 2024
GPU vs CPU is a parallelization vs complexity dilemma. While GPUs can manage very large parallel calculations, they struggle with linear, more heterogeneous tasks, where CPUs excel.
The information provided on this site is for informational purposes only. The content is based on the authors´ knowledge and research at the time of writing. It is not intended as professional advice or a substitute for professional consultation. Readers are encouraged to conduct their own research and consult with appropriate experts before making any decisions based on the information provided. The blog may also include opinions that do not necessarily reflect the views of the blog owners or affiliated individuals. The blog owners and authors are not responsible for any errors or omissions in the content or for any actions taken in reliance on the information provided. Additionally, as technology is rapidly evolving, the information presented may become outdated, and the blog owners and authors make no commitment to update the content accordingly.