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5. Drive Method

An LED is a current-operated device. In order to ensure intensity uniformity on multiple LEDs connected in

parallel in an application, it is recommended that a current limiting resistor be incorporated in the drive

circuit, in series with each LED as shown in Circuit A below.

Circuit model A

Circuit model B

LED

LED

(A) Recommended circuit.

(B) The brightness of each LED might appear different due to the differences in the I-V characteristics

of those LEDs.

6. ESD (Electrostatic Discharge)

Static Electricity or power surge will damage the LED.

Suggestions to prevent ESD damage:

 Use of a conductive wrist band or anti-electrostatic glove when handling these LEDs.

 All devices, equipment, and machinery must be properly grounded.

 Work tables, storage racks, etc. should be properly grounded.

 Use ion blower to neutralize the static charge which might have built up on surface of the LED’s plastic

lens as a result of friction between LEDs during storage and handling.

ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, low forward voltage,

or “ no lightup ” at low currents.

To verify for ESD damage, check for “ lightup ” and Vf of the suspect LEDs at low currents.

The Vf of “ good ” LEDs should be >2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP product.

Part No. : LTST-S220KSKT

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