How to read a datasheet - english version[1]

8/7/2019 How to read a datasheet - english version[1]

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Osram Opto Semiconductors and our Distributors.......the winning team !Stephan Kreuse

HOW TO READ A DATASHEET

What is a LED?

What are the advantages of LED?

Most important parameters of LED

Luminous flux and luminous intensity

Viewing angle

Wavelength

Exemplary explanation of datasheet for

Power Topled LY E675

New LED type designation scheme


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What is a LED?

A Light Emitting Diode

is a semiconductor where

the p region is dominated by positive

electric charges

the n region is dominated by negative electric charges

emits light when voltage is applied

the electrons cross the junction into the p region

the two charges re-combine and electric potential energy is

converted into electromagnetic energy


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MOVPE

GaN

SiC

SiliziumCarbid

LPE

GaP

VPE

GaAsP

MOVPE

InGaAlP

LPE

GaAlAs

430nm 587-630nm 560nm - 630nm 650 nm555nm - 573nm

blue green yellow- s.red green- s.red hyperred

MOVPE

InGaN

blue - green

High Brightness

450nm - 550nm

High Brightness

Production process of LED

Active Layers

GaP

GalliumPhosphit

GaAs

GalliumArsenit

Processe.g. MetalOxid

VaporPhaseE

pitaxie

Result

Material and production process of the LED determine its color

Substrate


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Production process of LED

Material and production process of the LED determine its price

standardpriced

high priced

InGaAIP

GaAIAsGaP

InGaN

GaN


5/25Osram Opto Semiconductors and our Distributors.......the winning team !

Stephan Kreuse

What are the advantages of LED?

no IR/UV-

radiation

small

dimensions

long

lifecycle

high

color efficiency

high

shock resistance

directionalradiation



Stephan Kreuse


Luminous flux and luminous intensity

Luminous flux

is the light emitted by a light source in all possible directions

without regard to the angle

is measured in lumen (lm; mlm)

Luminous intensity

is the light emitted by a light source in a given direction under

consideration of the included solid angle

is measured in candela (cd; mcd) in case of visible LED



Stephan Kreuse


Viewing angle

Diode emits visible or invisible light in a certain

angle defined by the package, e.g. with or without

lens

In general, radial led have a narrower viewing

angle than Topled due to design of the package

Narrow viewing angle leads to high light intensity

which is used for infrared applications (e.g. remote

control) or visible applications (e.g. traffic lights)

Wide viewing angle is mainly used for LCD

backlighting


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Peak wavelength wavelength with the highest emitted electromagnetic power

especially important for the description of infrared components


Wavelength

Wavelength is measured in nanometer (nm), range of 380 - 780 nm is recognized by human eye Advantage of LED: monochromatic emitter

Dominant wavelength is the wavelength considering human

eye sensitiviy defines the color we can see and is

calculated from the emitted lightspectrum

details


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Exemplary explanation of datasheet

for Power Topled LY E675

Datasheet

Luminous intensity and luminous flux

Forward voltage, forward current, reverse

voltage and power consumption

Wavelength

IR Reflow Soldering versus TTW Soldering


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Surge current (IFM )

maximum permissible surge current for pulsed operation

defined by pulse duration, duty factor and frequency

Reverse voltage (VR)

maximum voltage that can be applied in

reverse direction without destroying the LED

Power consumption (Ptot )

electrical energy used by LED

(net power and power loss)


Forward current, reverse voltage, power consumption

Forward current (IF)

current applied in forward direction

maximum permissible current

Detailed info

Maxim

um

Ra

tings


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Forward voltage

Increase of forward voltage leads to higher current

Maximal permissible forward current depends ontemperature (see diagram above)

higher current leads to higher luminous intensity


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Forward voltage

Increase of forward voltage leads tohigher current

Maximal permissible forward current

depends on temperature

higher current leads to higher

luminous intensity

AND


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Forward voltage

For special applications, forward voltage grouping is necessary

Therefore Osram offers voltage grouping

(see example below)

Each reel contains only one forward voltage group


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Wavelength

Dominant wavelength for visible LED

Wavelength groups especially important for yellow LED display

because of sensitivity of the human eye in the yellow spectrum

Application hint:

In case of InGaN technology, varying current might lead to color changes

How to avoid these color changes? See application note

Basic information


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Peak wavelength wavelength with the highest emitted electromagnetic power

especially important for the description of infrared components


Wavelength

Wavelength is measured in nanometer (nm), range of 380 - 780 nm is recognized by human eye Advantage of LED: monochromatic emitter

Dominant wavelength is the wavelength considering human

eye sensitiviy defines the color we can see and is

calculated from the emitted lightspectrum


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In case of yellow LED, range of wavelength groups is

3 nm

Due to production variations, single sub-groups cannot

be guaranteed (Gaussian distribution of wavelength

groups)

Consequently, your delivery chance increases with the

number of different wavelength groups you accept


Wavelength

Group - 1 stands for the total color tolerance range, containing sub-

groups 2 to 6 Each reel contains only one brightness selection and one

wavelength sub-group


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Viewing angle is 2 (here equivalent 120)

This viewing angle means

in case of Topled that the

radiation curve hits the 50%

line at 60


Wavelength

The angle where the luminous intensity has decreased to 50%of the maximum is defined as viewing angle


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Color coordinates instead of wavelength for white LED

W = White (GaN) (x=0.32/y=0.31)

s

0

0,1

0,2

0,3

0,4

0,5

0,6

0,7

0,8

0,9

0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8

blue

green

red

yellow

white

W = White (InGaN) (x=0.32/y=0.31)

Farbdreieck

Due to the composed spectrum of blue light (chip) and yellow light(converter material) it is necessary to use calculated color coordinates x and y


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Soldering Methods: IR Reflow or TTW Soldering

IR ReflowProcess

Print of solder paste on PCB

Placement of component

Reflow (Melting) process in infrared oven

Most common soldering method

Recommended

soldering profile


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Soldering Methods: IR Reflow or TTW Soldering

TTW Soldering (Through The Wave) Process

component must be glued onto PCB

PCB moves upside down through solder wave

due to high temperature, thermal stress for diode is enormous

Recommended

soldering profile


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The features of the LED are described by the LED typedesignation system

Please refer to short form catalogue for an overview over

the types that we are offering

Our new LED type designation

scheme will be introduced

1st of January 2002


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For detailed information about new designation system


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HOW TO READ A DATASHEET

THANKSFOR

YOURAT

TENTION

!!!!

Back to Starting Page


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Available in different brightnesses to best suit your applications

Blue

B = GaN-Blue 466nm

B = InGaN-Blue 470 nm

Green

V = Verde-Green 505 nm

T = True Green 525 nm

P = Pure Green 560 nm

G = Green 570 nm

Yellow Y = Yellow 588 nm

Orange

White

O = Orange 605 nm

Red

S = Super-Red 632 nm

H = Hyper-Red 640 nm

Amber A = Amber 615 nm

W = White

Full Color Spectrum

How to read a datasheet - english version[1]

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