NICHIA STS-DA1-5625 <Cat.No.190328>

38

(5) Electrostatic Discharge (ESD)

● This LED is sensitive to transient excessive voltages (e.g. ESD, lightning surge). If this excessive voltage occurs in the circuit, it

may cause the LED to be damaged causing issues (e.g. the LED to become dimmer or not to illuminate [i.e. catastrophic failure]).

Ensure that when handling the LEDs, necessary measures are taken to protect them from an ESD discharge. The following

examples are recommended measures to eliminate 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 all necessary measures are taken to prevent the LEDs from being exposed to transient excessive voltages (e.g. ESD,

lightning surge):

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

- appropriate ESD materials/equipment are used in the work area

- the system/assembly is designed to provide ESD protection for the LEDs.

● If the tool/equipment used is an insulator (e.g. glass cover, plastic, etc.), ensure that necessary measures have been taken to

protect the LED from transient excessive voltages (e.g. ESD). The following examples are recommended measures to eliminate

the charge:

- Dissipating static charge with conductive materials

- Preventing charge generation with moisture

- Neutralizing the charge with ionizers

● To detect if an LED was damaged by transient excess voltages (i.e. an ESD event during the system’s assembly process), perform

a characteristics inspection (e.g. forward voltage measurement, light-

up test) at low current (≤1mA).

● Failure Criteria: V

If the LED is damaged by transient excess voltages (e.g. ESD), it will cause:

- the LED not to illuminate at a low current

(6) Thermal Management

● The Absolute Maximum Junction Temperature (T

temperature of an LED while in operation may vary depending on the PCB thermal resistance and the density of LEDs on the PCB

assembly. Ensure that when using the LEDs for the chosen application, heat is not concentrated in an area and properly managed

in the system/assembly.

● The operating current should be determined by considering the temperature conditions surrounding the LED (i.e. T

when operating the LED, proper measures are taken to dissipate the heat.

● The following equations can be used to calculate the LED temperature (i.e. T

been reached.