Datasheet

LUXEON LED Assembly and Handling Application Brief AB32 20121217 25
5.2 Solder Paste
Philips Lumileds recommends lead-free solder for a LUXEON LED. Philips Lumileds successfully tested SAC 305 solder paste from Alpha Metals
(OM338 grade 3 and OM 325 grade 4) with satisfactory results. However, since application environments vary widely, Philips Lumileds recommends
that customers perform their own solder paste evaluation in order to ensure it is suitable for the targeted application.
5.3 Pick and Place Nozzle
Automated pick and place equipment provides the best placement accuracy for LUXEON LEDs. Since LUXEON LEDs come in two different
mechanical configurations (as explained in Section 1.1), Philips Lumileds recommends different pick and place nozzles for each configuration.
Note that pick and place nozzles are customer specific and are typically machined to fit specific pick and place tools. Philips Lumileds has
successfully worked with Micro-Mechanics (http://www.micro-mechanics.com/) in the past to obtain dedicated pick-up nozzles.
Pick and place for LUXEON LEDs (configuration A)
A generic nozzle for 0603 components with a pick-up area of 0.95mm x 1.75mm, or a Philips Lumileds specific nozzle can be used for pick and place
of LUXEON LEDs (configuration A). Neither nozzle makes any contact with the silicone lens of a LUXEON LED.
Figure 33 shows the typical pick-up area for a 0603 pick-up nozzle overlaid with the footprint of a LUXEON LED (configuration A). Since the outer
dimension of 0603 pick-up nozzles may vary between tools and vendors, it’s important to verify that the 0603 nozzle does not touch the silicone
lens. Using the pattern recognition system of pick and place equipment, the position of the nozzle during pick up is manually programmed. For
guidance, the bottom fiducial within the 0603 pick-up area can be used, as shown in Figure 33.
Figure 33. The typical pick up area of a 0603 nozzle, overlaid with the footprint of a LUXEON LED (configuration A).