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LED Engin | 651 River Oaks Parkway | San Jose, CA 95134 USA | ph +1 408 922 7200 | fax +1 408 922 0158 | em sales@ledengin.com | www.ledengin.com
COPYRIGHT © 2015 LED ENGIN. ALL RIGHTS RESERVED. LZ1-00DB00 (5.4 – 02/06/15)
LZ1 MCPCB Family
Emitter + MCPCB
Thermal Resistance
(°C /W)
Mechanical Mounting of MCPCB
MCPCB bending should be avoided as it will cause mechanical stress on the emitter, which could lead to
substrate cracking and subsequently LED dies cracking.
To avoid MCPCB bending:
o Special attention needs to be paid to the flatness of the heat sink surface and the torque on the screws.
o Care must be taken when securing the board to the heat sink. This can be done by tightening three M3
screws (or #4-40) in steps and not all the way through at once. Using fewer than three screws will
increase the likelihood of board bending.
o It is recommended to always use plastics washers in combinations with the three screws.
o If non-taped holes are used with self-tapping screws, it is advised to back out the screws slightly after
tightening (with controlled torque) and then re-tighten the screws again.
Thermal interface material
To properly transfer heat from LED emitter to heat sink, a thermally conductive material is required when
mounting the MCPCB on to the heat sink.
There are several varieties of such material: thermal paste, thermal pads, phase change materials and thermal
epoxies. An example of such material is Electrolube EHTC.
It is critical to verify the material’s thermal resistance to be sufficient for the selected emitter and its operating
conditions.
Wire soldering
To ease soldering wire to MCPCB process, it is advised to preheat the MCPCB on a hot plate of 125-150oC.
Subsequently, apply the solder and additional heat from the solder iron will initiate a good solder reflow. It is
recommended to use a solder iron of more than 60W.
It is advised to use lead-free, no-clean solder. For example: SN-96.5 AG-3.0 CU 0.5 #58/275 from Kester (pn:
24-7068-7601)