Wirebonding behind the scenes
From die placement to finished chip-on-board assembly, step by step.
Tiny Tapeout Team
•24 March 2026
Chip on board wirebonding
A lot of you have asked about our lovely chip-on-board wirebonding.
Here’s how it actually works!
The Process
The COB (chip-on-board) is loaded into a jig, and the wirebonding machine is calibrated for the chip pads. The die is carefully positioned and glued to the PCB, forming the chip-on-board.
The wirebonder then connects hundreds of microscopic wires from the chip to the PCB traces. And here’s the impressive part: the machine can do the whole chip in one go, automatically connecting every pad without human intervention.
Once the wirebonding is complete, a clear epoxy is applied to protect the die from damage and contamination.
The Result
The finished boards are ready for testing. From bare die to working chip-on-board, it’s a meticulous process that turns silicon into something you can actually use.
Watch the video here.
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Last modified by Matt Venn on 31 July 2026. Commit 8a58a7f. Suggestions?