T2520 Datasheet, PDF (12/14 Pages) List of Unclassifed Manufacturers – Thin Top View with Reflector

AVA technology
T2520
13. CAUTIONS:
(1)Storage
‧Before opening the package :
The LEDs should be kept at 30℃ or less and 30%RH~85%RH. The LEDs should be used within a year.
When storing the LEDs, moisture proof packaging with desiccant (Silica gel)is recommended.
‧After opening the package :
The LEDs should be kept at 30℃ or less and 30%RH~70%RH.The LEDs should be soldered within
168hours (7days) after opening the package. If unused LEDs remain, they should be stored in moisture
proof packages, such as sealed containers with packages of moisture desiccant (Silica ge1), or reseal the
moisture proof bag again.
If the moisture desiccant (Silica ge1) has faded away or the LEDs have exceeded the storage time, baking
treatment should be performed using the fo1lowing conditions.
Baking treatment: more than 24 hours at 65℃.
Please avoid conditions which may cause the LED to corrode, tarnish or disco1or. This corrosion or
discoloration might lower solderability or might effect on optical characteristics. Please avoid rapid
transitions in ambient temperature, especially in high humidity environments where condensation can
occur.
‧Moisture Proof package
When moisture is absorbed into the SMT package it may vaporize and expand during soldering. There is
a possibility that this can cause exfoliation of the contacts and damage to the optical characteristics of the
LEDs. For this reason, the moisture proof package is used to keep moisture to a minimum in the package.
A package of a moisture desiccant (silica gel)is inserted into the moisture proof bag. The silica gel
changes its color from blue to pink as it absorbs moisture.
(2)Static Electricity
‧Static electricity or surge voltage damages the LEDs. It is recommended that a wrist band or an
anti-electrostatic glove and shoe be used when handling the LEDs.
‧All devices, equipment and machinery must be properly grounded. It is recommended that measures be
taken against surge voltage to the equipment that mounts the LEDs.
‧When inspecting the final products in which LEDs were assembled, it is recommended to check whether
the assembled LEDs are damaged by static electricity or not. It is easy to End static-damaged LEDs by a
light-on test or a V_F test at a lower current (below l mA).
‧Damaged LEDs will show some unusual characteristics such as the leak current remarkably increases, the
forward voltage becomes lower, or the LEDs do not light at the low current. (Criteria : V_F>2.0V at
I_F=0.5mA.)
(3)Heat Generation
‧Please consider the heat generation of the LED when making the system design that it’s very importance.
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, and 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.
Doc. No. : RD-EDS-0004
Version 1.2
Date : 2005.07.08
Page: 11 of 13