NS2W157R Nichia, NS2W157R Datasheet - Page 7

• Manufacturer Part Number: NS2W157R
• Manufacturer: Nichia

Specifications of NS2W157R

• Size Lxwxh (mm): 3.0x1.4x0.52
• Lumi-nous Inten-sity Typ(cd): 18.6
• Lumi-nous Flux Typ(lm)): 55.0
• Forward Voltage Vf(v) Typ: 6.40
• Forward Voltage Vf(v) Max: 7.00
• Directivity (degree): 120
• If (ma): 75
• Mounting Style: Through Hole

· 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
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 dice temperature (Tj).
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 Ts.
Tj=Ta + Rja W
Tj = Dice Temperature : °C, Ta = Ambient Temperature : °C,
Ts = Solder Temperature (Cathode Side) : °C,
Rja = Heat resistance from Dice to Ambient temperature : °C /W,
Rjs = Heat resistance from Dice to Ts measuring point ≒ 25°C /W,
W = Inputting Power (I
1
F
V
F
) : W
Tj=Ts + Rjs W
It is necessary to avoid intense heat generation and operate
The coefficient of temperature increase per input
-6-
Ts Point
2
Please consider the heat generation
Nichia STS-DA1-1142B
<Cat.No.100513>