Datasheet
LUXEON LED Assembly and Handling Application Brief AB32 20121217 6
Fiducial Marks for a LUXEON LED (configuration B):
A LUXEON LED (configuration B) has two fiducial marks labeled F1 and F2 as shown in Figure 4. An optional third fiducial, F3, may be present as
well. These fiducial marks provide the most accurate methodology to locate the theoretical optical center, marked by the red dot in Figure 4. The
theoretical optical center is located 1.450mm from the vertical and horizontal edges of fiducial marks F1 and F2. The theoretical optical center also
lies 1.577mm above the center of fiducial F3, if present, along an imaginary line drawn between the center of fiducial F3 and the midpoint between
fiducials F1 and F2. The actual optical center of a LUXEON LED (configuration B) is within a circular diameter of 0.290mm with respect to the
theoretical optical center.
Figure 5 shows the typical metallization pattern of a LUXEON LED (configuration B).
(
o
p
tional
)
Theoretical
Optical Center
(
p
)
Figure 4. The fiducial marks on the front side of a LUXEON LED (configuration B)
provide the most accurate method to find the theoretical optical center. All dimensions are in mm.
Figure 5. Typical metallization pattern of a LUXEON LED (configuration B).
The TVS in this configuration resides in a separate pocket on the ceramic substrate.