NS2L095BT NICHIA CORPORATION, NS2L095BT Datasheet - Page 6

• Manufacturer Part Number: NS2L095BT
• Description: Specifications For Nichia Chip Type Warm White Led
• Manufacturer: NICHIA CORPORATION

(3) Static Electricity
(4) Application Design Considerations
· Static electricity or surge voltage damages the LEDs.
· All devices, equipment and machinery must be properly grounded. It is recommended that precautions
· When inspecting the final products in which LEDs were assembled, it is recommended to check
· Damaged LEDs will show some unusual characteristics such as the forward voltage becomes lower,
· In designing a circuit, the current through each LED must not exceed the absolute maximum rating
· This product should be operated in forward bias. A driving circuit must be designed so that the product
· Thermal design of the end product is of paramount importance.
· Please determine the operating current with consideration of the ambient temperature local to the LED
· The equation 1 indicates correlation between Tj and Ta, and the equation 2 indicates correlation
It is recommended that a wrist band or an anti-electrostatic glove be used when handling the LEDs.
be taken against surge voltage to the equipment that mounts the LEDs.
whether the assembled LEDs are damaged by static electricity or not.
static-damaged LEDs by a light-on test or a VF test at a lower current (below 2mA is recommended).
or the LEDs do not light at the low current.
specified for each LED. It is recommended to use Circuit B which regulates the current flowing
through each LED. In the meanwhile, when driving LEDs with a constant voltage in Circuit A, the
current through the LEDs may vary due to the variation in forward voltage (V
worst case, some LED may be subjected to stresses in excess of the absolute maximum rating.
is not subjected to either forward or reverse voltage while it is off. In particular, if a reverse voltage is
continuously applied to the product, such operation can cause migration resulting in LED damage.
of the LED when making the system design.
electric power is affected by the thermal resistance of the circuit board and density of LED placement
on the board, as well as other components.
within the maximum ratings given in this specification.
and refer to the plot of Ambient temperature vs. Allowable Forward Current on CHARACTERISTICS
in this specifications. Please also take measures to remove heat from the area near the LED to improve
the operational characteristics of the LED.
between Tj and Ts1.
Criteria : (V
Tj=Ta + Rja W
Tj = Dice Temperature : °C, Ta = Ambient Temperature : °C,
Ts1 = Solder Temperature (Cathode Side) : °C,
Rja = Heat resistance from Dice to Ambient temperature : °C /W,
Rjs1 = Heat resistance from Dice to Ts1 measuring point ≒ 55°C /W,
W = Inputting Power (I
(A)
F
> 2.0V at I
1
F
F
=1mA)
V
F
) : W
Tj=Ts1 + Rjs1 W
It is necessary to avoid intense heat generation and operate
(B)
The coefficient of temperature increase per input
-5-
2
Please consider the heat generation
It is easy to find
F
) of the LEDs. In the
Nichia STS-DA1-0370A
<Cat.No.090311>