LTW-020ZDCG White LED Datasheet - SMD Package - Typical Voltage 3.2V - 20mA - Luminous Intensity 1000-1720mcd - Technical Documentation

1. Product Overview

This component is a white surface-mount light-emitting diode, designed as a compact and energy-efficient light source. It combines the inherent long lifespan and high reliability of LED technology with competitive brightness levels, aiming to provide design flexibility for solid-state lighting applications intended to replace traditional lighting solutions.

1.1 Core Advantages and Target Market

Sifa kuu za LED hizi ni usawa na vifaa vya kukandamiza otomatiki, ufanisi kwa mchakato wa kuchomelea kwa mionzi ya infrared na mvuke, na kufuata viwango vya bidhaa za kijani (bila risasi na zinazokidhi RoHS). Inafungwa kwenye mkanda wa mm 12 na kuviringishwa kwenye spool yenye kipenyo cha inchi 7.

Maeneo ya matumizi makuu:

• Reading lights inside cars, buses, and airplanes.
• Portable lighting, such as flashlights and bicycle lights.
• Architectural and decorative lighting: downlights, cove lighting, under-cabinet lighting, task lighting.
• Taa za Nje na Usalama: Taa za Mlingoti, Taa za Bustani.
• Alama: Alama zinazong'aa kwenye kingo, zinazotumika kwenye maonyesho ya kutoka au sehemu ya mauzo.
• Signal Lighting: Traffic lights, beacons, railway crossing lights.

2. Vigezo vya Kiufundi: Ufafanuzi wa kina na usio na upendeleo

2.1 Viwango vya Juu Kabisa

These ratings define the limits beyond which permanent damage to the device may occur. Operation under reverse bias conditions is specifically cautioned against.

• Power Dissipation:120 mW
• Peak Forward Current:100 mA (at 1/10 duty cycle, 0.1ms pulse width)
• DC Forward Current:30 mA
• Reverse voltage:5 V
• Operating temperature range:-30°C to +85°C
• Storage temperature range:-40°C to +100°C
• Reflow soldering conditions:Peak temperature 260°C, maximum 10 seconds (lead-free process).

2.2 Electro-Optical Characteristics

Masharti ya kipimo ni joto la mazingira (Ta) 25°C, mkondo wa mbele (IF) 20 mA, isipokuwa ikitajwa vinginevyo.

• Nguvu ya mwanga (IV):Minimum 1000 mcd, typical 1720 mcd. This parameter is measured using a sensor with a filter matched to the CIE photopic human eye response curve.
• Viewing angle (2θ1/2):110 degrees. This angle defines the angular distribution range where the luminous intensity is at least half of the peak intensity.
• Chromaticity coordinates (x, y):Based on the CIE 1931 chromaticity diagram. The provided typical values are x=0.300, y=0.290. The tolerance for these coordinates is ±0.01. The referenced test standard is CAS140B.
• Forward voltage (VF):At IF=20mA, minimum 2.9 V, maximum 3.6 V.
• ESD Withstand Voltage:2 kV (Human Body Model). It is strongly recommended to take appropriate ESD protection measures, including the use of grounded wrist straps and equipment.

3. Mfumo wa Uainishaji Maelezo

Bidhaa zinagawanywa katika viwango tofauti kulingana na vigezo muhimu, ili kuhakikisha uthabiti ndani ya kundi la uzalishaji. Wabunifu lazima wazingatie viwango hivi, ili kufanikisha ufanani wa rangi na mwangaza katika matumizi yao.

3.1 Uainishaji wa Voltage ya Mbele (VF)

LED zinagawanywa katika viwango (V0 hadi V6) kulingana na kushuka kwa voltage kwa mwelekeo mzuri (forward voltage drop) kwenye 20mA. Aina kila moja ina anuwai ya voltage ya 0.1V, na kila aina ina uvumilivu wa ziada wa ±0.1V.

• Mfano: Kikundi V0 kinashughulikia 2.9V hadi 3.0V.

3.2 Luminous Intensity (IV) Binning

LEDs are graded (T, A, B, C, D) based on their luminous intensity at 20mA. Each grade has a tolerance range of ±10%.

• Example: Grade D covers 1580 mcd to 1720 mcd.

3.3 Chromaticity Zone Grade (Chromaticity Binning)

Detailed tables define specific color zone grades (e.g., A52, A53, BE1, BG3). Each grade is defined by a quadrilateral or triangular area on the CIE 1931 chromaticity diagram, specified by three or four (x, y) coordinate points. This allows for precise color selection and matching for applications requiring specific white point coordinates.

4. Performance Curve Analysis

The datasheet references typical electrical and optical characteristic curves measured at an ambient temperature of 25°C. While the provided text does not detail specific charts, such curves typically include:

• Relative luminous intensity vs. forward current:Shows how the light output increases with current, typically in a non-linear manner, eventually reaching saturation.
• Forward Voltage vs. Forward Current:IV curve, showing the exponential relationship characteristic of a diode.
• Relative Luminous Intensity vs. Ambient Temperature:Maelezo kuwa pato la mwanga hupungua kadri joto la kiungo linavyoongezeka, ambalo ni sababu muhimu ya usimamizi wa joto.
• Usambazaji wa nguvu ya wigo:Kwa LED nyeupe (ambayo inaweza kuwa na chip ya bluu na fosforesheni), hii itaonyesha kilele cha mwanga wa bluu na wigo mpana zaidi wa mwanga wa manjano unaobadilishwa na fosforesheni.

5. Mechanical and Packaging Information

5.1 Outline Dimensions

All dimensions are in millimeters, with a standard tolerance of ±0.1 mm unless otherwise specified. The package is in the industry-standard SMD format. The anode pin is clearly marked in the diagram to facilitate correct polarity identification during assembly.

5.2 Recommended PCB Land Pattern

Provides printed circuit board pad pattern design to ensure reliable soldering during infrared or vapor phase reflow processes. Following this recommended pad layout is crucial for forming good solder joints and ensuring mechanical stability.

6. Soldering and Assembly Guide

6.1 Vigezo vya Uchomeaji wa Reflow

Kipengele hiki kimepimwa kwa ajili ya uchomeaji wa reflow bila risasi, kwa kiwango cha juu cha joto cha 260°C, kwa muda wa sekunde 10 kwa upeo. Inashauriwa kutumia mkunjo wa uchomeaji wa reflow unaolingana na kiwango cha J-STD-020D. Mkunjo huu unapaswa kujumuisha hatua zinazofaa za joto la awali, kudumisha joto, reflow, na baridi, ili kupunguza mshtuko wa joto na kuhakikisha mwunganisho wa chuma thabiti.

6.2 Hifadhi na Masharti ya Uendeshaji

Kulingana na kiwango cha JEDEC J-STD-020, kiwango cha unyevu nyeti (MSL) cha LED hii ni cha 3.

• Ufungashaji uliofungwa:Store at ≤30°C and ≤90% RH. Shelf life is one year in a moisture barrier bag with desiccant.
• Opened Packaging:Store at ≤30°C and ≤60% RH. Components must be soldered within 168 hours (7 days) after opening. If the Humidity Indicator Card turns pink (≥10% RH) or the exposure time is exceeded, it is recommended to bake at 60°C for at least 48 hours before use. Reseal unused parts with desiccant.

6.3 Usafi

Ikiwa usafi unahitajika baada ya kulehemu, tumia tu vimumunyisho vilivyobainishwa. Inakubalika kumwacha LED katika ethanol au isopropanol kwa si zaidi ya dakika moja kwa joto la kawaida. Kukatazwa kutumia vimumunyisho vya kemikali visivyobainishwa, kwani vinaweza kuharibu kifurushi cha LED au vipengele vya macho.

7. Ufungaji na Taarifa za Kuagiza

7.1 Vipimo vya Ukanda na Reel

Vipengele vimefungwa kwenye ukanda ulioinuliwa wenye upana wa 12mm, na umegundishwa kwenye reel yenye kipenyo cha inchi 7 (178mm).

• Reel capacity:Up to 2000 pieces per reel.
• Cover tape:Vifurushi vimefungwa juu kwa mkanda wa kufunika.
• Vipengele vilivyokosekana:Kulingana na vipimo, inaruhusiwa kukosekana kwa vipengele viwili mfululizo ("taa").
• Kigezo:Ufungaji unalingana na mfumo wa EIA-481-1-B.

Mchoro wa kina wa vipimo vya mfereji na reel umetolewa katika hati ya maelezo.

8. Application Suggestions and Design Considerations

8.1 Design Considerations

• Upunguzaji wa mtiririko:Daima tumia chanzo cha mkondo wa mara kwa mara au upinzani wa kudhibiti mkondo kuendesha LED. Upeo mkubwa wa mkondo wa moja kwa moja ni 30mA; mkondo wa kawaida wa kufanya kazi ni 20mA.
• Usimamizi wa joto:Ingawa matumizi ya nguvu ni ya chini (upeo wa 120mW), kuhakikisha eneo la kutosha la shaba la PCB au mashimo ya kupoza joto husaidia kudumisha halijoto ya chini ya kiungo, na hivyo kudumisha mwanga wa pato na maisha ya huduma.
• Ulinzi wa ESD:Implement ESD protection measures in the circuit and during operation, as the device is rated for only 2kV HBM ESD withstand voltage.
• Optics:A 110-degree viewing angle is suitable for wide-area illumination. For a focused beam, secondary optical elements (lenses) are required.

8.2 Application Limitations and Precautions

The datasheet contains important warnings regarding the scope of application. These LEDs are suitable for standard commercial and industrial electronic products. They are not designed or certified for use in situations where failure could directly endanger life or health, such as:

• Aviation control systems
• Medical Life Support Equipment
• Traffic Safety Critical Signals (Without Additional Certification)
• Mifumo mingine ya kuaminika sana / yenye umuhimu wa usalama

Matumizi kama haya yanahitaji ushauri kutoka kwa mtengenezaji.

9. Technical Comparison and Differentiation

Although this single datasheet does not provide a direct comparison with other models, the key differentiating features of this component can be inferred:

• Luminance Range:Ina toa kipimo chake cha ufungaji, hutoa nguvu ya mwanga ya kiasi kikubwa (hadi 1720 mcd kwa 20mA), inayolenga matumizi yanayohitaji mwanga mzuri wa chanzo cha nukta.
• Mgawanyo wa eneo la rangi:Orodha pana ya viwango vya eneo la rangi inaruhusu uteuzi sahihi wa rangi, ambayo ni muhimu kwa matumizi yanayohitaji muonekano thabiti wa nyeupe kati ya LED nyingi.
• Uchangamano:Inalingana kabisa na mchakato wa kawaida wa usakinishaji wa SMD (usakinishaji wa kiotomatiki, upasuaji wa mionzi ya infrared/gesi), na kuifanya iwe suluhisho la kuziba-na-kutumia kwa uzalishaji mkubwa.

10. Frequently Asked Questions Based on Technical Parameters

10.1 Je, mkondo wa kawaida wa uendeshaji na voltage ni nini?

The standard test condition and typical operating point is a forward current of 20mA. At this current, the forward voltage typically ranges from 2.9V to 3.6V, depending on the VF bin. The power dissipation is approximately 60-70mW.

10.2 How to interpret the color grading code?

Msimbo wa herufi na nambari (mfano A52, BE3) unalingana na eneo maalum kwenye chati ya rangi ya CIE 1931 iliyofafanuliwa kwenye jedwali la ngazi ya ukanda wa rangi. Ili kuhakikisha uthabiti wa rangi katika muundo, taja na utumie LED ya ngazi sawa ya ukanda wa rangi. Herufi/nambari ya kwanza kwa kawaida hutumiwa kwa kundi la joto la rangi au hue zinazofanana.

10.3 Can I drive this LED with a 5V power supply?

Haiwezi kuendeshwa moja kwa moja. Kuunganisha chanzo cha 5V moja kwa moja kwenye ncha za LED kutasababisha mkondo mkubwa kupita kiasi, uwezekano mkubwa wa kuzidi viwango vya juu kabisa na kuharibu kifaa. Lazima utumie kipingamkondo kilicho mfululizo au kiendesha cha mkondo wa kudumu. Kwa mfano, kwa kutumia chanzo cha 5V, lengo la mkondo 20mA, ukidhani VF ni 3.2V, upinzani wa mfululizo unaohitajika ni R = (5V - 3.2V) / 0.02A = 90 ohms (upinzani wa kawaida wa 91 ohms unaweza kutumika).

10.4 What are the handling requirements for MSL Level 3?

MSL 3 inamaanisha kuwa baada ya mfuko wa kuzuia unyevu kufunguliwa, kifurushi hicho kinaweza kukabili hali ya kiwanda kwa saa 168 (siku 7) kwa upeo (≤30°C/60% RH). Ikiwa mfuko umefunguliwa, una wiki moja kukamilisha mchakato wa reflow soldering. Ikiwa muda huu unazidi, ni lazima kuoka vipengele kwa 60°C kwa masaa 48, ili kuondoa unyevu uliokithiri, na kuzuia tukio la "popcorn" (kufunguka kwa kifurushi) wakati wa reflow soldering.

11. Practical Design and Usage Examples

11.1 Example: Designing a PCB-Mounted Indicator Light

Tukio:Create a simple status indicator light powered by a 3.3V microcontroller GPIO pin.
Design Steps:

1. Upunguzaji wa mtiririko:The GPIO pin can provide 20mA of current. This matches the typical current of an LED. No external driver is needed.
2. Hesabu ya Upinzani (Kwa Usalama):Ingawa VCC (3.3V) iko karibu na VF (~3.2V), ni desturi nzuri kuunganisha upinzani mdogo wa mfululizo ili kudhibiti mkondo wa mshtuko wa ghafla. R = (3.3V - 3.2V) / 0.02A = 5 ohms. Tumia upinzani wa ohms 10 kwa udhibiti salama zaidi wa mkondo.
3. Mpangilio wa PCB:Tumia mpangilio ulipendekezwa wa pad. Unganisha cathode (inayoonyeshwa kwenye mchoro wa umbo) kwenye resistor, kisha kwenye pini ya GPIO. Unganisha anode kwenye reli ya umeme ya 3.3V. Jumuisha kipande kidogo cha shaba chini ya pad ya LED kusaidia kupoza joto kidogo.
4. Programu:Weka pini ya GPIO kwa hali ya juu ili kuwasha LED.

11.2 Mfano: Safu ya LED Nyingi za Taa za Kazi

Tukio:Buni taa ya chini ya kabati inayotumia LED 10 ili kufikia mwangaza sawasawa.
Mazingatio ya Ubunifu:

• Ulinganifu wa Rangi:Specify a single, strict color bin (e.g., BE2) to the supplier to avoid visible color differences between LEDs.
• Driving Method:Use a constant-current LED driver IC capable of providing 200mA (10 LEDs * 20mA) for series or series-parallel configurations. Due to voltage drop, a simple linear regulator will be very inefficient.
• Usimamizi wa joto:Panga LEDs kwa umbali unaofaa kwenye Bodi ya Mzunguko wa Kisasa cha Metali (MCPCB) ili kuwezesha upotezaji wa joto. LED kila moja 120mW inamaanisha matumizi ya jumla ya nguvu 1.2W, na muundo wa joto unahitaji kukusudiwa.
• Optics:Boriti ya mwanga ya asili ya digrii 110 inaweza kutosha. Ikiwa unahitaji athari iliyolengwa zaidi au iliyotawanyika, zingatia kuongeza bodi ya kuongoza mwanga au bodi ya kutawanya mwanga.

12. Utangulizi wa Kanuni ya Uendeshaji

LED nyeupe kama LTW-020ZDCG kawaida hufanya kazi kulingana na kanuni ya ubadilishaji wa fosforesheni. Kiini cha kifaa ni chipu ya semikondukta, kwa kawaida imetengenezwa kwa Indiamu-Galiamu-Nitrati (InGaN), ambayo hutoa mwanga wa bluu inapopitishwa mkondo mbele. Chipu hii inayotoa mwanga wa bluu hupakwa au kufunikwa na nyenzo za fosforesheni—kwa kawaida zinazotokana na Yttrium Aluminium Garnet (YAG) iliyochanganywa na Sere.

Wakati fotoni za bluu kutoka kwenye chipu zinapogonga fosforesheni, sehemu yake hufyonzwa. Kisha, fosforesheni hutoa tena nishati hiyo kwenye wigo mpana zaidi (hasa katika eneo la manjano). Mwanga wa bluu uliobaki ambao haujafyonzwa huchanganywa na mwanga wa manjano unaotolewa na fosforesheni, na kusababisha mtazamo wa mwanga mweupe katika jicho la mwanadamu. Uwiano halisi wa mwanga wa bluu na manjano, pamoja na utungaji maalum wa fosforesheni, huamua joto la rangi linalohusiana (CCT) na kuratibu za kromosomu (x, y) za mwanga mweupe unaotokana, na hivyo kuunda mfumo wa kina wa uainishaji unaoelezewa katika hati ya maelezo ya kiufundi.

13. Mwelekeo wa Kiufundi na Maendeleo

Uwanja wa Taa Imara (SSL) unaendelea kukua. Mienendo ya jumla inayoweza kutambuliwa ndani ya tasnia hutoa muktadha wa kuelewa vipengele kama hivi, ikiwa ni pamoja na:

• Uboreshaji wa ufanisi (lumen kwa watt):Uboreshaji endelevu wa teknolojia za epitaxial ya semiconductor, muundo wa chip, na fosfori, umeboresha kwa utulivu ufanisi wa mwanga wa LED nyeupe, na hivyo kupunguza matumizi ya nishati kwa pato sawa la mwanga.
• Uboreshaji wa Ubora wa Rangi:Uundaji wa mchanganyiko wa fosforasi nyingi na nyenzo mpya za fosforasi (k.m. quantum dots) unalenga kuboresha faharasa ya uonyeshaji rangi (CRI), kufanya rangi zionekane zaidi asilia chini ya taa za LED, na kutoa anuwai pana zaidi ya halijoto sahihi ya rangi.
• Kupunguzwa kwa Ukubwa na Msongamano Mkubwa:Uboreshaji wa teknolojia ya ufungaji umefanya LED ziwe na eneo dogo la kuchukua na msongamano mkubwa wa nguvu, na hivyo kufanikisha suluhisho za taa zenye ukubwa mdogo na mwangaza zaidi.
• Taa Zenye Akili na Zilizounganishwa:Kuunganisha vifaa vya elektroniki vya udhibiti moja kwa moja kwenye ufungaji au moduli ya LED, ili kufanikisha kupunguza mwanga, kurekebisha rangi na muunganisho (IoT), ni mwelekeo unaokua, unaozidi zaidi ya vipengele vya kawaida visivyo na nguvu.
• Uthabiti na Utabiri wa Umri wa Huduma:Uelewa wa kina wa mifumo ya kushindwa na mbinu bora za majaribio, umefanya utabiri wa maisha (viashiria vya L70, L90) chini ya hali mbalimbali za uendeshaji kuwa sahihi zaidi, jambo muhimu sana kwa usanifu wa taa wa kitaalamu.

Vipengele kama vilivyoelezwa katika maelezo ya maelezo haya vinawakilisha hatua ya ukamilifu katika maendeleo ya kiteknolojia hii, ikitoa suluhisho zinazotegemewa na zilizosanifishwa kwa matumizi mapana ya taa ya jumla.