Die attach adhesive is the first material decision in semiconductor packaging, and it sets the ceiling for everything that follows. The die must stay mechanically fixed, electrically connected where required, and thermally coupled to the package or board below it. Pick the wrong die attach adhesive and the assembly may pass incoming inspection yet crack at reflow or drift electrically after a thousand thermal cycles. JOME builds epoxy, silver-filled and UV-curing die attach adhesive grades for exactly these failure modes.
Die attach adhesive selection by thermal and electrical duty
Die attach adhesive choice begins with two numbers: the thermal conductivity the junction needs and the electrical behaviour the circuit demands. Conductive silver systems such as JOM6934, rated at 2.6W/m·K, suit high-power LEDs, ordinary ICs, transistors and small sensors where heat must leave the die. Insulating grades protect circuits that need dielectric isolation at the joint. The die attach adhesive question is never “which is strongest”, it is “what must pass through this joint”. Insulating adhesive grades in the die attach lineup protect circuits that need dielectric isolation at the joint.
Die attach adhesive selection also has to match the thermal budget of the assembly line. JOME6688 is the low-temperature rapid-curing chip adhesive in the range, curing at 110℃ for 90 seconds or 120℃ for 60 seconds, which puts it inside the process window of camera modules, CMOS sensors, smart cards and photoelectric modules that cannot tolerate a long oven profile. Faster cure at lower temperature is the single biggest lever on packaging line throughput.
Die attach adhesive for optoelectronics takes a third path. JM8303 is the UV-curing bonding adhesive, positioned for micro LEDs, automotive displays, camera modules and fingerprint recognition chips where instant green strength lets the line move before a thermal cure. Does the part contain shadowed areas UV cannot reach? Then a dual-cure or thermal fallback belongs in the same design review, because partial cure is worse than slow cure.
Automotive grades: JOME621 and moisture sensitivity
Die attach adhesive in automotive electronics carries a reliability requirement consumer grades skip. JOME621 is the vehicle-grade high-reliability epoxy in JOME’s lineup, with thermal conductivity at or above 9W/m·K and a passed MSL1 level moisture sensitivity test. Automotive MCUs, QFN/QFP packaging and automotive lidar driver chips are its target scenarios, where popcorn cracking after humidity exposure is the classic field failure.
Die attach adhesive qualification for automotive modules should include the moisture sensitivity test at the assembly level, not just the material datasheet value. The MSL1 result reported for JOME621 applies to the tested package construction and its stated conditions; retest for your own package. Dry storage, controlled floor exposure and a reflow profile that does not steam absorbed moisture into the joint protect that result in production.
Insulating die attach: comparing the three standard systems
Die attach adhesive in the insulating class divides into three practical profiles in JOME’s range. The general insulating bonding adhesive runs at 25℃ viscosity of 10000 mPa·s or less, volume resistivity at or above 10¹⁵ Ω·cm, shear strength at or above 4.1 MPa, thermal conductivity at or above 0.6W/m·K and a 170℃ two-hour cure, with Shore hardness at or above 80D and 2mm×2mm chip shear force at 25℃ of 6000g or more. Its typical application is low-power IC and MEMS work.
Die attach adhesive in the high-power LED class moves the numbers up: the insulating silicone grade holds 12500±1000cps viscosity, 1.2×10¹⁵ Ω·cm resistivity, shear strength at or above 13.8 MPa (2000psi), 0.9W/m·K conductivity and a 150℃ to 160℃ 90-minute cure, with 82D hardness and 7000g chip shear at 25℃. Its home is the high-power LED ceramic holder, where the joint sees heat all day and the wider thermally conductive silicone gel range covers the next interface outward.
Die attach adhesive for advanced packaging is the low-stress insulating grade: viscosity around 10.5 Pa·s, resistivity at or above 10¹⁴ Ω·cm, shear strength at 26.4 MPa, thermal conductivity at or above 1.5W/m·K and the same fast 110℃ 90-second or 120℃ 60-second cure as the rapid chip adhesive, with low elastic modulus, 8000g chip shear at 25℃ and 3000g at 160℃. Camera modules and ultra-thin chip stacking are the target scenarios, where a stiff adhesive would stress the stack.
Conductive silver paste: three performance tiers
Die attach adhesive in the conductive silver class has its own ladder. The general-purpose LED conductive silver paste runs 100 to 300 Pa·s viscosity at 25℃, 70% to 90% silver content, volume resistivity at or below 10⁻⁶ Ω·cm and shear strength at or above 10 MPa. It is the volume choice for LED production where cost per die matters and the thermal duty is moderate.
Die attach adhesive at the automotive tier raises silver content to 85% or more, pushes resistivity down to 5×10⁻⁷ Ω·cm or below and shear strength to 15 MPa and above, with viscosity tightened to 80 to 200 Pa·s. The semi-baked nano-silver paste goes furthest: 95% or more silver, resistivity at or below 1×10⁻⁸ Ω·cm and shear strength at or above 20 MPa. Silver loading, resistivity and shear strength move together, and the price moves with them.
Process control: what breaks die attach in production
Die attach adhesive process failures are predictable, and they repeat across every packaging line JOME has supported. The most common report arriving at a technical inbox is not a bad material certificate; it is a good material run at the wrong dispense weight or cure profile. Second on the list is moisture: a pallet of dies left open on a humid afternoon absorbs enough water to blister at reflow, and the die attach adhesive gets blamed for a storage mistake. Third is substrate contamination, usually a fingerprint or residual cutting fluid on the paddle. None of these needs a chemistry change to fix.
Die attach adhesive process failures are cheap to prevent. Dispense volume drift causes voiding, and voids concentrate thermal resistance exactly where the die is hottest. Cure schedule deviation leaves the joint under-cured and weak at high temperature: the 2mm×2mm chip shear numbers at 160℃ in the tables above exist precisely because room-temperature strength means little inside a working package. Surface contamination on the die back or the substrate paddle blocks adhesion completely.
Die attach adhesive line control therefore needs three checkpoints: dispense weight per die, cure temperature profile verification, and shear testing on sample dies pulled per shift. JOME manufactures these materials in its own factory with RoHS and REACH compliant grades available, and provides TDS documentation so incoming inspection can quote stated numbers.
Specifying without regret
Die attach adhesive specifications age well when they name four things: the die size and metallisation, the maximum process temperature, the required thermal conductivity and the moisture sensitivity target. Everything else follows from those. JOME supplies die attach adhesive customers in more than 30 countries and supports trials with free samples sized for pilot lines. Electronics potting adhesive work downstream of die attach protects the finished assembly, and the two processes share the same cure-control discipline.
Die attach adhesive work connects directly to the rest of the package. Engineers handling board-level protection can continue with the PCB glue solution guide, thermal interface choices sit in the thermally conductive adhesive range, and structural reinforcement options are covered by the structural adhesive catalogue. The previous entry in this series, our NEV thermal management solution, shows how these joints behave at system level. Questions about matching a die attach adhesive to your package go to the JOME technical team, the full JOME product list covers every model named above, and the Shanghai JOME Industrial homepage frames the complete portfolio.