LED

Technologies Advantages
DIE ATTACH High thermal conductivity / Non-yellowing
THERMAL DISSIPATION Low thermal resistivity also for ceramic onto heatsink
COATING/ENCAPSULATION Optically clear non-yellowing in UV or thermal cure

led

DIE ATTACH

Typical Application

LED chips need to be bonded onto lead frames which are typically Ag-metallised. PROTAVIC offers a range of electrically conductive die attach adhesives which have been developed specifically for this application.
For good wire-bondability, the adhesives have excellent mechanical resistance at elevated temperature, which is also important in case of LED’s which are soldered onto PCB boards.

In case of LED applications, also B-stageable conductive adhesives can be considered. These offer the advantage of being applicable by stencil printing, allowing higher throughput, combined with the technical advantage of controlled bondlines, and less fillets, which becomes increasingly important as LED chips are getting thinner.

ELECTRO-CONDUCTIVE PROTAVIC® CHEMESTRY VISCOSITY* AT 5 RPM (mPa.S ) THERMAL CONDUCTIVITY (W/m.K) ELECTRICAL CONDUCTIVITY (mΩ.cm) TG (°C) CTE PPM /°C STORAGE COND. POT LIFE AT 20±2° C CURING SCHEDULES
PROTAVIC® ACA 20510 Acrylic 10000 >17 0.1 37 6 months@-40°C 1 day 30min@200°C
PROTAVIC® ACE 30512 Epoxy 10000 0.05 6 months@-20°C 1 month 90min @180°C
PROTAVIC® ACH 30200 Hybrid 10000 29 0.01 60  20 6 months@-20°C 7 days 15mn @150°C
+15min @200°C
PROTAVIC® ACE 30032 Epoxy 8000 3 0.1 80 100 6 months@-20°C 1 day 60 min@150°C
PROTAVIC® ACE 34683 Epoxy 6100 2.6 0.370 134  77 1 year@-40° C 3 days 20min@200°C 1hr@150 °C
PROTAVIC® ACE 34030 Epoxy 8700 3.6 0.175 74 35 6 months@-20°C >1 day 30min @175°C
PROTAVIC® ACH 35001 Hybrid 9600 15 0.13 209 45 6 months@-20°C 1 day 30min@80° +60min @175°C
PROTAVIC® BCE 20240 Epoxy B- stageable 25000 2.8 1 65 50 1 year@0°C 1 month 30min@90°C
+30min @180°C
PROTAVIC® BCE 34815 Epoxy 10400 10 0.07 101 72 1 year@-40°C 1 day 1hr@175 °C

Some LED designs, require chip bonding with transparent die attach materials, to enable reflection from Ag-metallized base-substrate. PROTAVIC has developped a non-yellowing, transparent die attach adhesive for LED assembly.

NON CONDUCTIVE PROTAVIC ® CHEMESTRY VISCOSITY AT 5 RPM (mPa.S) TG (°C) CTE (ppm/°C) STORAGE COND. POT LIFE AT 20±2°C CURING SCHEDULE HEGMANN FINENESS (micron)
PROTAVIC ® ANE 30050 Epoxy 15000 83 65 1 year@-20°C 14 days 60min@170°C 1 max

THERMAL DISSIPATION

Especially high power LED’s generate a lot of heat during operation. To increase the lifetime, as well as the efficiency of the LED’s, it’s important to bond the LED’s with adhesives with excellent thermal dissipation.
Unlike the die attach adhesives which have best thermal conductivities, in some applications, the thermal adhesive must be dielectric.
For those applications, PROTAVIC has developed a range of materials, as listed in below table.

THERMAL DISSIPATION PROTAVIC ® CHEM. MIXING RATIO (BY WEIGHT) VISCOSITY AT 5 RPM (mPa.s) THERMAL CONDUCTIVITY W/m.K TG (°C) CTE 1 (ppm/°C) STORAGE COND. POT LIFE AT 20±2°C CURING SCHEDULE
PROTAVIC ® ATE 10120 Epoxy  One part 10000 75 65 1 year@-20°C Several weeks 10min@ 150°C
PROTAVIC ® ATE 10601 A&B Epoxy 1/1 15000 >1.5 70 50 1 year@25°C 12 hrs 2hrs@80° C
8min@150°C
6sec.@200°C
PROTAVIC ® ATE 46439A&B Epoxy 100/9 12000 3 1 year@25°C 4 hrs 3hrs@75° C
1hr@100° C
PROTAVIC ® ATE 46439A&B BLACK Epoxy 100/9 8000 3 3 months@25°C 4 hrs 3hrs@75° C
1hr@100° C

COATING AND ENCAPSULATION

Typical Application

To protect LED’s from external factors such as moisture, dust, etc. , in many applications LED’s are protected by potting materials. Large lighting manufacturers for outdoor applications also require suitable environmental protection.
PROTAVIC has developed a range of materials, with different chemistries, offering long term non-yellowing protection. The products include water-clear silicones, polyurethanes and/or UV-curable materials.

COATING & ENCAPSULANT PROTAVIC® CHEM. MIXING RATIO (BY WEIGHT) VISCOSITY AT 5 RPM (mPa.s) TG (°C) CTE (ppm/°C) STORAGE COND. POT LIFE AT 20±2°C CURING SCHEDULES
PROTAVIC® PNU 46202 A&B Urethane 1/1 8000 -38 230 1 year @25°C 5min 24hrs@25°C
30min@50°C
10sec@95°C
PROTAVIC® PNU 46202 A&B Translucent Urethane 1/1 8000 -38 230 1 year @25°C 5min 24hrs@25°C
30min@50°C
PROTAVIC® PNS 56226 A&B Silicone 1/1 600 -64 5500 1 year @25°C 10min 12 hours@25°C
PROTAVIC® PNS 30110 A&B Silicone 1/1 2200 1 year @25°C 7 days 2hrs@150°C
PROTAVIC® ANO 90161 Prop. 350@100rpm 80 120 6 months @-20°C Several days 5 sec. 120mW/cm²