Jake Heisler Copper Pillar Flip Chip: When Standoff Has to Be Controlled A copper pillar bump — C2 — replaces the C4 solder ball with a plated copper post carrying a small solder cap. The post does not melt at reflow, so the gap between die and substrate is set by the heig... Advanced Packaging Flip Chip Sep 5, 2026
Jake Heisler Thermosonic Wire Bonding: What It Is, and Who Does It as a Service in the US Thermosonic wire bonding is a solid-state welding process that attaches a fine wire — almost always gold — to a bond pad using ultrasonic energy and heat together, with the part held at roughly 150 °C... Advanced Packaging Wire Bonding Aug 29, 2026
Jake Heisler GaN-on-SiC vs GaN-on-Si: What Changes for the Package Two dies can both be GaN and give you completely different packaging problems. The epi layer is the same material; what differs is the substrate it was grown on, and the substrate is what the package ... Advanced Packaging Die Attach Aug 13, 2026
Jake Heisler Flip Chip Underfill: Capillary vs No-Flow, and Why It Decides the Bump Underfill gets scheduled like a finishing operation — bump the wafer, attach the die, then fill the gap. But whether underfill can flow at all is decided by geometry that was frozen at the bump decisi... Advanced Packaging Flip Chip Aug 12, 2026
Jake Heisler Hermetic Seal Leak Testing: What MIL-STD-883 Method 1014 Actually Proves "Hermetic" sounds binary and is not. It is a statement about a leak rate — how fast gas crosses the seal — and a package either meets a specified rate or it does not. MIL-STD-883 Method 1014 is the st... Advanced Packaging Hermetic Packaging Aug 12, 2026
Jake Heisler Silver Sinter vs Solder Die Attach: When the Part Runs Hot Solder has a ceiling that is easy to miss on a datasheet. It is not about how well the joint conducts heat — it is that a solder joint's own melting point sets the temperature the finished part can su... Advanced Packaging Die Attach Aug 12, 2026
Jake Heisler Types of Wire Bonding: Ball, Wedge and Ribbon Wire bonding looks like one process with a few settings. It is really three processes that happen to share a machine, and the choice between them is usually made for you — by what metal is on the pad,... Advanced Packaging Wire Bonding Aug 12, 2026
Jake Heisler Eutectic vs Epoxy Die Attach: When To Use Each Almost nobody chooses a die attach method. It arrives with the quote, because the line that priced the build already runs one, and the thermal design quietly forms around that decision. That works unt... Advanced Packaging Die Attach Aug 12, 2026
Jake Heisler C4 Bump Pitch: What Sets the Limit C4 bump pitch has a floor because a molten solder ball spreads as it collapses during reflow — a fixed volume of metal that has to clear its neighbors without bridging. There's no single number: the l... Advanced Packaging Flip Chip Process Insight Aug 5, 2026
Jake Heisler What Is a C4 Bump? Solder Bump Basics for Flip Chip C4 — Controlled Collapse Chip Connection — is a flip-chip interconnect made from solder balls, typically 60–100µm in diameter, that melt during reflow and self-align the die by surface tension as the ... Advanced Packaging Flip Chip Process Insight Aug 5, 2026
Jake Heisler C4 vs Copper Pillar: Choosing the Flip-Chip Bump Most teams do not choose a flip-chip bump. They inherit one, because the substrate vendor quotes what their line already runs and the package quietly forms around that decision. That is fine until pit... Advanced Packaging Flip Chip Process Insight Jul 27, 2026
Heisler Semiconductor LLC, Omkar Gaikwad Wire Bonding vs Flip Chip: When to Use Which The honest answer to wire bond or flip chip is rarely about which one is more advanced. Both are mature, both ship in high-reliability hardware, and neither is a trophy. The real question is what the ... Advanced Packaging Flip Chip Jul 12, 2026
