A die shear test pushes sideways on an attached die until it separates from the substrate, and records the force it took. That force is the direct measurement of die-attach strength, and MIL-STD-883 Method 2019 is the standard that defines how the push is applied, how much force the joint has to survive, and how the failure is classified. It answers one question well — is the attach strong enough — and it is deliberately paired with other checks because there are failures it cannot see.
What Method 2019 measures
The test is destructive. A shear tool contacts the die at a controlled height above the substrate and moves at a controlled rate, loading the attach in shear until the die breaks free. The peak force is the result. Because it destroys the part, die shear is run on a sample plan for lot acceptance, or on process-monitor coupons and sacrificial units, rather than on every shippable die.
Method 2019 also fixes the conditions that would otherwise make the number meaningless — tool geometry, shear height, and travel rate — so a value measured in one lab means the same thing in another. A shear force quoted without the method behind it is not comparable to one that cites it.
What the strength number means
The minimum acceptable shear force is not a single figure. It scales with the die attach area, because a larger bonded footprint should carry proportionally more load, and the standard sets that relationship out in a table keyed to die area, with the required strength expressed relative to that area. Above a certain die size the requirement plateaus. The practical point for a buyer: the pass threshold for your die comes out of that table in Method 2019, sized to your specific die, not from a single number that travels between parts. We work to the threshold the standard sets for your die area rather than quoting a strength in the abstract.
The failure mode is half the result
A die shear test reports two things: the force, and where the joint failed. Method 2019 classifies the failure — die fracture, separation at the die-to-attach interface, failure within the attach material, or separation at the substrate. Two joints can shear at the same force and mean opposite things: a high force that ends in die fracture is a strong attach, while the same force with a clean lift at the interface can point to a wetting or contamination problem that will not age well. Reading the failure surface is where a shear test earns its keep, and it is why the result is inspected, not just logged as a number.
What die shear does not tell you
Shear strength is not void content. A joint can pass its shear threshold and still carry voids that matter for the thermal path, because the intact bonded area around the void can be strong enough to pass while the heat path underneath is compromised. Voids are a separate measurement — verified by X-ray when void measurement is required by the part or the specification. Nor does die shear say anything about the wire bonds on top of the die: those are verified by pull to MIL-STD-883 Method 2011, the wire-bond analog of this test, covered in what Method 2011 actually verifies. Attach strength, void content and bond integrity are three questions, and one test answers one of them.
Where to start
Two facts scope die-attach verification:
- The die attach area, because it sets the Method 2019 minimum shear force your joint has to meet.
- The qualification target — a commercial sample plan and a MIL-STD-883 screen are different amounts of work, and it is cheaper to know which before the process is developed.
We run die shear to MIL-STD-883 Method 2019, X-ray void analysis when measurement is required, cross-section and automated optical inspection in Halethorpe, Maryland, on US soil. More on our die bonding services page.
Answered.
What does MIL-STD-883 Method 2019 test?
Die shear strength. The method defines a destructive test that pushes an attached die sideways until it separates from the substrate and records the peak force, under fixed tool geometry, shear height and travel rate so the result is comparable between labs. It verifies that the die attach is strong enough and classifies how the joint failed.
What is the minimum die shear strength?
It is not a single number. Method 2019 sets the minimum acceptable shear force in a table keyed to the die attach area — a larger bonded area is required to carry proportionally more force — and the requirement plateaus above a certain die size. The pass threshold for a given die is read from that table for its area, not quoted as one figure for all parts.
Why does the failure mode matter in a die shear test?
Because two joints can shear at the same force and mean opposite things. Method 2019 classifies the failure — die fracture, separation at the die-to-attach interface, failure within the attach, or separation at the substrate. A high force ending in die fracture is a strong attach; the same force with a clean interface lift can signal a wetting or contamination problem.
Does die shear testing detect voids?
No. A joint can pass its shear threshold and still carry voids that matter for the thermal path, because the bonded area around a void can be strong enough to pass while the heat path is compromised. Voids are a separate measurement, verified by X-ray when void measurement is required by the part or specification.
Do you run die shear testing to MIL-STD-883 in the US?
Yes — die shear to MIL-STD-883 Method 2019, alongside X-ray void analysis when measurement is required, cross-section and automated optical inspection, in Halethorpe, Maryland, on US soil, for prototype through low-volume work.