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(4) Soldering Conditions

· Nichia LEDs uses a copper alloy lead frame which provides a high thermal conductivity.

Thermal

stress such as soldering heat may reduce the reliability of the product; particular caution should be

used to avoid damage prior to and during soldering.

The recommended soldering conditions are

listed in the following table.

· Solder the LED no closer than 1.6mm from the base of the stopper.

· The mechanical stress by clinching will cause degradation of the reliability on the LEDs. It is

important to minimize the mechanical stress on the LEDs.

It should be confirmed beforehand

that it will not cause any problem when using it.

· Recommended soldering conditions

Dip Soldering

Hand Soldering

Pre-Heat

Pre-Heat Time

Solder Bath

Temperature

Dipping Time

Dipping Position

120°C Max.

60 seconds Max.

260°C Max.

5 seconds Max.

No lower than 1.6 mm from the

base of the stopper.

Temperature

Soldering Time

Position

350°C Max.

3 seconds Max.

No closer than 1.6 mm from the

base of the stopper.

· 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 epoxy bulb 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 resin may be caused

from warping of the PC board or from the clinching and cutting of the leadframes.

When it is

absolutely necessary, the LEDs may be mounted in this fashion but the customer 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 resin deterioration, will occur.

Nichia’s LEDs should not be

soldered directly to double sided PC boards because the heat will deteriorate the epoxy resin.

· 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 leadframes at room temperature.

Cutting the leadframes at high temperatures may

cause failure of the LEDs.

(5) 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 resin 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.

Nichia STS-DA1-0230C

<Cat.No.090428>