NSHU550B Datasheet, PDF (6/14 Pages) NICHIA CORPORATION – UV LED

Nichia STSE-CH4021A-1
<Cat.No.061227>
(5) Soldering Conditions
· Solder the LED no closer than 3mm from the base of the lead.
· Recommended soldering conditions
Dip Soldering
Hand Soldering
Pre-Heat
120°C Max.
Temperature
350°C Max.
Pre-Heat Time 60 seconds Max.
Soldering Time 3 seconds Max.
Solder Bath
260°C Max.
Position
No closer than 3 mm from the
Temperature
base of the lead.
Dipping Time 10 seconds Max.
Dipping Position No lower than 3 mm from the
base of the lead.
· Although the recommended soldering conditions are specified in the above table, dip or hand
soldering at the lowest possible temperature is desirable for the LEDs.
· A rapid-rate process is not recommended for cooling the LEDs down from the peak temperature.
· Dip soldering should not be done more than one time.
· Hand soldering should not be done more than one time.
· Do not apply any stress to the lead particularly when heated.
· The LEDs must not be repositioned after soldering.
· After soldering the LEDs, the lead should be protected from mechanical shock or vibration until
the LEDs return to room temperature.
· Direct soldering onto a PC board should be avoided. Mechanical stress to the glass may be caused
from warping of the PC board or from the clinching and cutting of the leads. When it is
absolutely necessary, the LEDs may be mounted in this fashion but the User will assume responsibility
for any problems. Direct soldering should only be done after testing has confirmed that no damage,
such as wire bond failure or glass deterioration, will occur. Nichia’s LEDs should not be soldered
directly to double sided PC boards because the heat will deteriorate the glass.
· When it is necessary to clamp the LEDs to prevent soldering failure, it is important to minimize
the mechanical stress on the LEDs.
· Cut the LED leads at room temperature. Cutting the leads at high temperatures may
cause failure of the LEDs.
(6) Heat Generation
· Thermal design of the end product is of paramount importance. Please consider the heat generation
of the LED when making the system design. The coefficient of temperature increase per input
electric power is affected by the thermal resistance of the circuit board and density of LED placement
on the board, as well as other components. It is necessary to avoid intense heat generation and operate
within the maximum ratings given in this specification.
· The operating current should be decided after considering the ambient maximum temperature of LEDs.
(7) Cleaning
· It is recommended that isopropyl alcohol be used as a solvent for cleaning the LEDs. When using
other solvents, it should be confirmed beforehand whether the solvents will dissolve the glass or not.
Freon solvents should not be used to clean the LEDs because of worldwide regulations.
· Do not clean the LEDs by the ultrasonic. When it is absolutely necessary, the influence of ultrasonic
cleaning on the LEDs depends on factors such as ultrasonic power and the assembled condition.
Before cleaning, a pre-test should be done to confirm whether any damage to the LEDs will occur.
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