Datasheet

Mechanical

These light bar devices may be operated in ambient tem-

peratures above +60°C without derating when installed

in a PC board conguration that provides a thermal re-

sistance pin to ambient value less than 280°C/W/LED. See

Figure 2 or 7 to determine the maximum allowed ther-

mal resistance for the PC board, Rq

PC-A

, which will permit

nonderated operation in a given ambient temperature.

To optimize device optical performance, specially devel-

oped plastics are used which restrict the solvents that

may be used for cleaning. It is recommended that only

mixtures of Freon (F113) and alcohol be used for vapor

cleaning processes, with an immersion time in the va-

pors of less than two (2) minutes maximum. Some sug-

gested vapor cleaning solvents are Freon TE, Genesolv

DES, Arklone A or K. A 60°C (140°F) water cleaning pro-

cess may also be used, which includes a neutralizer rinse

(3% ammonia solution or equivalent), a surfactant rinse

(1% detergent solution or equivalent), a hot water rinse

and a thorough air dry. Room temperature cleaning may

be accomplished with Freon T-E35 or T-P35, Ethanol, Iso-

propanol or water with a mild detergent.

For further information on soldering LEDs please refer to

Application Note 1027.

The time average luminous intensity may be adjusted for

operating ambient temperature by the following expo-

nential equation:

) = I

(25°C)e

[K (T –25°C)]

Color K

AlGaAs Red –0.0095/°C

HER –0.0131/°C

Yellow –0.0112/°C

Green –0.0104/°C

Example:

(80°C) = (25 mcd)e

[-0.0112 (80-25)]

= 14 mcd.

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AV02-4479EN - March 31, 2014