Nichia STS-DA1-0106
<Cat.No.080220>
(3) Static Electricity
· Static electricity or surge voltage damages the LEDs.
It is recommended that a wrist band or an anti-electrostatic glove be used when handling the LEDs.
· All devices, equipment and machinery must be properly grounded. It is recommended that precautions
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 find
static-damaged LEDs by a light-on test or a VF test at a lower current (below 1mA is recommended).
· Damaged LEDs will show some unusual characteristics such as 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)
(4) LED position and orientation
· Warpage of circuit board with soldered LEDs may result in damage or package breakage of the LEDs.
Please pay special attention to the orientation of the LEDs as to avoid LED failure caused by bow, twist
and warpage of the board.
【Non-preferable】
Cathode mark
【Preferable】
Cathode mark
When mechanical stress from the board affects the soldered LED, place the LED in the preferable
location and orientation as shown above.
· Depending on the position and direction of LED, the mechanical stress on the LED package can be
changed. Refer to the following figure.
E
Perforated line
A
C
D
B
Slit
Stress : A > B = C > D > E
· When separating the circuit boards with soldered LEDs, please use appropriate tools and equipment.
Hand brake without these tools and equipment may not be used.
· The use of aluminum substrate increases stress to solder joints due to thermal expansion of substrate and
subsequently may result in solder joint crack. Users may need to evaluate their specific application to
determine any impact due to the use of aluminum substrate.
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NICHIA [ NICHIA CORPORATION ]
