Revision 1-Feb 10, 2009
Precautions:
Assembly method: This product is not meant for auto-insertion.
Lead Forming:
• The leads of an LED lamp may be preformed or cut to length
prior to insertion and soldering into PC board.
• If lead forming is required before soldering, care must be taken to
avoid any excessive mechanical stress induced to LED package.
Otherwise, cut the leads of LED to length after soldering process
at room temperature. The solder joint formed will absorb the
mechanical stress of the lead cutting from traveling to the LED
chip die attach and wirebond.
• During lead forming, the leads should be bent at a point at least
3mm from the base of the lens. Do not use the base of the lead
frame as a fulcrum during forming. Lead forming must be done
before soldering at normal temperature.
• It is recommended that tooling made to precisely form and cut the
leads to length rather than rely upon hand operation.
Soldering Conditions:
• Care must be taken during PCB assembly and soldering process
to prevent damage to LED component.
• The closest LED is allowed to solder on board is 1.59 mm below
the body (encapsulant epoxy) for those parts without standoff.
• Recommended soldering conditions:
Wave Soldering Manual Solder
Dipping
Pre-heat Temperature 105°C Max. -
Pre-heat Time 60 sec Max. -
Peak Temperature 250°C Max. 260°C Max.
Dwell Time 3 sec Max. 5 sec Max.
• Wave soldering parameter must be set and maintained
according to recommended temperature and dwell time in the
solder wave. Customer is advised to periodically check on the
soldering profile to ensure the soldering profile used is always
conforming to recommended soldering condition.
• If necessary, use fixture to hold the LED component in proper
orientation with respect to the PCB during soldering process.
• Proper handling is imperative to avoid excessive thermal
stresses to LED components when heated.
• Therefore, the soldered PCB must be allowed to cool to room
temperature, 25°C, before handling.
• Special attention must be given to board fabrication, solder
masking, surface plating and lead holes size and component
orientation to assure solderability.
• Recommended PC board plated through-hole sizes for LED
component leads:
LED Component
Lead Size
Diagonal Plated Through
Hole Diameter
0.457 x 0.457 mm
(0.018 x 0.018 inch)
0.646 mm
(0.025 inch)
0.976 to 1.078 mm
(0.038 to 0.042 inch)
0.508 x 0.508 mm
(0.020 x 0.020 inch)
0.718 mm
(0.028 inch)
1.049 to 1.150 mm
(0.041 to 0.045 inch)
Note: Refer to application note AN1027 for more information
on soldering LED component.
Figure 5: Recommended Wave Soldering Profile.