-5-

(3) Recommended circuit

· In designing a circuit, the current through each LED must not exceed the absolute maximum rating

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

worst case, some LED may be subjected to stresses in excess of the absolute maximum rating.

· This product should be operated in forward bias. A driving circuit must be designed so that the product

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.

(4) Heat Generation

· Thermal design of the end product is of paramount importance.

Please consider the heat generation

of the LED when making the system design.

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, as well as 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.

(A)

(B)

Nichia STS-DA1-0226

<Cat.No.080519>