NICHIA STS-DA1-3577A <Cat.No.150421>

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(4) Design Consideration

● Volatile organic compounds that have been released from materials present around the LEDs (e.g. housing, packing,

adhesive, secondary lens, lens cover, etc.) may penetrate the LED lens and/or encapsulating resin.

If the LEDs are being used in a hermetically sealed environment, these volatile compounds can discolor after being exposed

to heat and/or photon energy and it may greatly reduce the LED light output and/or cause a color shift.

In this case, ventilating the environment may improve the reduction in light output and/or color shift.

Perform a light-up test of the chosen application for optical evaluation to ensure that there are no issues,

especially if the LEDs are planned to be used in a hermetically sealed environment.

● Excessive forces on this product can cause the ceramic package to crack.

It is recommended to use a holder when fixing this product to a chassis.

● It is recommended to use a thermal film or thermal grease between the product and a chassis for increased heat dissipation.

(5) Electrostatic Discharge (ESD)

● The products are sensitive to static electricity or surge voltage. ESD can damage a die and its reliability.

When handling the products, the following measures against electrostatic discharge are strongly recommended:

Eliminating the charge

Grounded wrist strap, ESD footwear, clothes, and floors

Grounded workstation equipment and tools

ESD table/shelf mat made of conductive materials

● Ensure that tools (e.g. soldering irons), jigs and machines that are being used are properly grounded and

that proper grounding techniques are used in work areas. For devices/equipment that mount the LEDs,

protection against surge voltages should also be used.

● If tools or equipment contain insulating materials such as glass or plastic,

the following measures against electrostatic discharge are strongly recommended:

Dissipating static charge with conductive materials

Preventing charge generation with moisture

Neutralizing the charge with ionizers

(6) Thermal Management

● Proper thermal management is an important when designing products with LEDs. LED die temperature is affected

by LED module thermal resistance and LED spacing. Please design products in a way that the LED die temperature

into the end-product, by the following equation.

Tc Point