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LTST-S271KRWT Datasheet(PDF) 10 Page - Lite-On Technology Corporation

Part No. LTST-S271KRWT
Description  ROHS, Side Looking Chip LED, Ultra Bright A1InGaP Chip LED
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Maker  LITEON [Lite-On Technology Corporation]
Homepage  http://www.liteon.com.tw/databook/default.htm
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LTST-S271KRWT Datasheet(HTML) 10 Page - Lite-On Technology Corporation

 
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LITE-ON
TECHNOLOGY
CORPORATION
P r o p e r t y o f L i t e - O n O n l y
Part
No. : LTST-S271KRWT
Page :
10
of
12
BNS-OD-C131/A4
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.


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