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LTST-S220TGKT Datasheet(PDF) 10 Page - Lite-On Technology Corporation

Part No. LTST-S220TGKT
Description  ROHS, Side Looking Chip LED, Ultra Bright InGaP Chip LED
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Maker  LITEON [Lite-On Technology Corporation]
Homepage  http://www.liteon.com.tw/databook/default.htm

LTST-S220TGKT Datasheet(HTML) 10 Page - Lite-On Technology Corporation

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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
(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-S220TGKT
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