- EXCELLENT CAPILLARY ACTION FOR FAST FLOW
- REWORKABLE AT 120°C
- COMPATIBLE WITH NO-CLEAN FLUX RESIDUES
- NO VOIDING
- GOOD STORAGE PROPERTIES
- CONSISTENT VISCOSITY
- Underfill 620 has a work life of 1 ½ months at 22°C and 30% RH.
- For best results, the application substrate should be pre-heated to 40-50ºC. Although not required, the dispense nozzle may be preheated in order to decrease viscosity/increase flow speed.
- System pressure should be moderate (15 to 40 psi). Dispense speed should also be moderate (0.10 to 0.50 inch/sec.). In addition, the dispense platform should be able to maintain the needle tip approximately 1-3 mils off the substrate surface and 1-3 mils offset from the chip edge. This will ensure maximum underfill flow consistency.
- The dispense pattern for small die applications (1/4”) is typically single side or single corner only, with no secondary dispense or final perimeter bead required. The low viscosity and excellent wetting characteristics of this product allow the material to “self-fillet” along the opposite edge of the die.
- The dispense pattern for larger die applications is typically an “L” pattern along 2 sides, focused at the corner. The flow pattern should be designed to start at the location farthest away from the chip center, which helps assure a void free fill underneath the die. In addition, the dispense pattern may require a 2nd or 3rd bead with time delay for flow underneath the chip. A final perimeter bead/fillet may be dispensed to ensure uniform stress distribution at the chip edges.
- Underfill 620 is reworkable by heat. The suggested rework procedure is to heat the part to be removed to its standard reflow temperature and removing it with a flat spatula.
- Use with adequate ventilation and proper personal protective equipment.
- Refer to the accompanying Material Safety Data Sheet for any specific emergency
- Do not dispose of any hazardous materials in non-approved containers.
620 Underfill Epoxy
DESCRIPTION http://www.aimsolder.com.au/index.php/adhesives/107-620-underfill-epoxy
Underfill 620 is a fast flowing liquid epoxy designed for use as a capillary flow underfill for flip chip, CSP, BGA and uBGA assemblies. Underfill 620 is designed to enhance solder joint reliability by minimizing induced stresses and providing improved temperature cycling performance and excellent chemical resistance. Underfill 620 offers superior reliability through high Tg, low CTE, good fill, no voiding, compatibility with no-clean flux residues and excellent adhesion.
Faster throughput and higher yields are achieved through excellent capillary action, faster flow characteristics and rapid cure speeds. Underfill 620 may be reworked at 120°C. The viscosity of Underfill 620 remains stable throughout its shelf life. This product is suitable for bare chip protection in a broad variety of small die applications.
FEATURES
PHYSICAL PROPERTIES
STORAGE
Underfill 620 has a room temperature shelf-life of 12 months.
PACKAGING
Underfill 620 is non-hygroscopic and therefore can be packaged in syringes, jars, bottles and cartridges.
SAFETY
