|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 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
|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
|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|
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
|PROTAVIC ® ATE 46439A&B||Epoxy||100/9||12000||3||1 year@25°C||4 hrs||3hrs@75° C
|PROTAVIC ® ATE 46439A&B BLACK||Epoxy||100/9||8000||3||3 months@25°C||4 hrs||3hrs@75° C
COATING AND ENCAPSULATION
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
|PROTAVIC® PNU 46202 A&B Translucent||Urethane||1/1||8000||-38||230||1 year @25°C||5min||24hrs@25°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|