Die attach equipment
The tools that place each die onto its package substrate or carrier and bond it down — the first assembly step after a wafer is cut into individual chips.
In short
Die attach equipment picks up an individual die and bonds it onto a substrate, leadframe, or another die. It is the first step of assembly: getting the bare chip mounted so it can be connected and protected.
Why it matters
The die-attach bond holds the chip in place and often carries heat (and sometimes current) away from it. A weak or voided bond leads to overheating and reliability failures, so die-attach quality underpins the whole package.
Beginner intuition
Once a wafer is sliced into individual chips, each tiny die has to be set down accurately onto its package and fixed in place — that is die attach.
The 'glue' can be an adhesive, a polymer paste, or a solder, chosen for how much heat or current the bond must carry.
Where it fits in manufacturing
At the start of assembly, right after the wafer is singulated into dies and before interconnection (wire bonding or flip-chip).
How it works
What goes in
- Singulated dies
- A substrate, leadframe, or base die
- A die-attach material (adhesive, paste, or solder)
What happens inside
- Pick: a tool picks up a known-good die.
- Place: it positions the die accurately onto the substrate.
- Bond: the die-attach material is cured or reflowed to fix the die in place.
What comes out
- A die mounted and bonded to its carrier, ready for interconnection.
Major subsystems
Pick-and-place head
Picks up and precisely positions each die.
Material dispense
Applies adhesive, paste, or solder for the bond.
Bond / cure stage
Cures or reflows the material to set the bond.
Vision / alignment
Aligns the die to the substrate accurately.
Process parameters that matter
- Placement accuracy
- How precisely the die lands on the substrate.
- Bond-line thickness
- The thickness of the attach material, affecting heat flow and stress.
- Void content
- Trapped voids in the bond that hurt heat transfer and reliability.
- Throughput
- Dies placed per hour.
A note on numbers
Common issues
What can go wrong:
- Voids in the bond → hot spots and reliability loss
- Die tilt or misplacement → downstream interconnect problems
- Insufficient cure or reflow → a weak bond
- Contamination → poor adhesion
Yield implications
Because it is early in assembly, a die-attach defect can waste all the value added afterward; bond integrity is a key reliability driver.
Advanced & research
Emerging and research directions, beyond today’s established practice.
- Solder and sintered-metal die attach for high power and heat
- Die-to-die attach for 3D stacks
- High-accuracy placement for fine-pitch and chiplet assembly
How this connects
Related process
Related concepts
Related materials
Related equipment
How this fits into manufacturing
A result is never the equipment alone. For Advanced packaging, it comes from process + equipment + material + control + metrology together.
Packaging connection
Die attach is the opening step of packaging; the substrate it bonds to and the thermal path it creates shape the whole package.
Packaging →Supply-chain connection
Die attach depends on substrates, adhesives, and solder materials from the packaging-materials supply chain.
Supply chain →