LTST-C281KFKT Orange LED Datasheet - 0.35mm Ultra-Thin Height - 2.4V Forward Voltage - 75mW Power Dissipation - Technical Documentation

1. Product Overview

The LTST-C281KFKT is a surface-mount device (SMD) light-emitting diode (LED) designed for modern electronic applications requiring compact, high-brightness indicator lights. This device falls under the chip LED category, characterized by its extremely slim profile and compatibility with automated assembly processes.

Core Advantages:Upeo mkuu wa LED hii ni pamoja na unene wake wa kifuniko wa milimita 0.35, unaofaa kutumia katika miundo yenye nafasi ndogo. Inatumia nyenzo za semiconductor za AlInGaP (aluminium-indium-gallium-phosphide), zinazojulikana kwa uzalishaji wa mwanga wa juu na utulivu wa rangi ya machungwa. Kifaa hiki kinatii maagizo ya RoHS (Restriction of Hazardous Substances), na ni bidhaa ya kirafiki kwa mazingira. Inafungwa kwenye mkanda wa milimita 8, reel ya kipenyo cha inchi 7, na inaendana kabisa na vifaa vya kiotomatiki vya kasi ya juu vya kupachika, na hivyo kurahisisha mchakato wa uzalishaji wa wingi.

Soko lengwa:LED hii inalenga hasa matumizi katika elektroniki za watumiaji, vifaa vya otomatiki ya ofisi, vifaa vya mawasiliano na vifaa vya kawaida vya nyumbani vinavyohitaji kiashiria cha hali cha kuaminika na cha mkali. Vigezo vyake vya muundo vinaufanya ufawe kutumia teknolojia ya kawaida ya infrared reflow soldering kwa kuunganishwa kwenye PCB (Printed Circuit Board).

2. Detailed Technical Parameters

2.1 Absolute Maximum Ratings

Viwango hivi vinafafanua mipaka inayoweza kusababisha uharibifu wa kudumu wa kifaa. Hakuna uhakikisho wa uendeshaji chini ya hali hizi.

• Power Dissipation (Pd):75 mW. This is the maximum power that the LED package can dissipate in the form of heat under specified ambient conditions (Ta=25°C). Exceeding this limit risks thermal degradation.
• Peak Forward Current (I_FP):80 mA. Hii ndiyo kiwango cha juu cha mkondo wa mbele unaoruhusiwa kwa muda mfupi, unaruhusiwa tu chini ya hali ya msisimko (1/10 uwiano wa wajibu, upana wa msukumo 0.1ms). Ni kubwa zaidi kuliko kiwango cha DC, ili kukabiliana na mafuriko ya mkondo ya muda mfupi.
• Mkondo wa Mbele wa DC (I_F):30 mA. Hii ndiyo kiwango cha juu cha mkondo wa mbele unaopendekezwa kwa utendaji wa kuaminika wa muda mrefu. Hali ya kawaida ya kazi ya kupima sifa za macho ni 20 mA.
• Reverse voltage (V_R):5 V. Applying a reverse bias exceeding this value may cause junction breakdown.
• Operating and storage temperature:The device can operate within an ambient temperature range of -30°C to +85°C. For non-operating storage, the temperature range extends to -40°C to +85°C.
• Welding Conditions:This LED can withstand infrared reflow soldering with a peak temperature of 260°C for a duration of 10 seconds, which is consistent with common lead-free (Pb-free) soldering process profiles.

2.2 Electro-Optical Characteristics

Unless otherwise specified, these parameters are measured at a standard ambient temperature of 25°C and a forward current (I_F) of 20 mA. They define the device's performance under normal operating conditions.

• Luminous intensity (I_V):) ranges from a minimum of 45.0 mcd to a typical value of 90.0 mcd. The intensity is measured using a sensor-filter combination approximating the photopic (CIE) human eye response curve. The actual intensity is subject to a binning system (see Section 3).
• Viewing angle (2θ_1/2):130 degrees. This is the full angle at which the luminous intensity drops to half of the value measured on the center axis (0°). Such a wide viewing angle is typical for chip LEDs using lensless (water-clear) packages, providing broad, diffuse illumination.
• Peak emission wavelength (λ_P):611 nm. This is the wavelength at which the spectral power distribution of the emitted light reaches its maximum. It defines the perceived hue of the orange light.
• Peak Wavelength (λ_d):605 nm. Derived from the CIE chromaticity diagram, this is the single wavelength that best represents the perceived color of the LED's output, corresponding to standard orange.
• Spectral Line Half-Width (Δλ):17 nm. This parameter indicates the spectral purity or bandwidth of the emitted light. It is the width of the spectral distribution at half of its maximum power. A value of 17 nm is characteristic of AlInGaP material, providing good color saturation.
• Forward Voltage (V_F):Typical value is 2.40 V, maximum is 2.40 V at I_F=20mA. Minimum value is 2.0 V. This is the voltage drop across the LED when the specified current is conducted.
• Reverse Current (I_R):When a 5V reverse voltage (V_R) inapo, ni ya juu zaidi 10 μA. Hii inaonyesha mkondo wa uvujaji katika hali ya kuzimwa.

3. Maelezo ya Mfumo wa Kupanga

Ili kuhakikisha uthabiti wa mwangaza kati ya mfululizo tofauti wa uzalishaji, nguvu ya mwanga ya LTST-C281KFKT imegawanywa katika viwango tofauti. Kila kiwango kinawakilisha anuwai maalum ya thamani ya nguvu iliyopimwa chini ya hali ya kawaida ya majaribio ya mkondo wa mbele wa 20 mA.

Orodha ya nambari za vigezo kama ifuatavyo:

• Nambari ya kiwango P:45.0 mcd (kidogo) hadi 71.0 mcd (kubwa)
• Gear Code Q:71.0 mcd to 112.0 mcd
• Gear Code R:112.0 mcd to 180.0 mcd
• Bin code S:180.0 mcd to 280.0 mcd

A tolerance of +/-15% is applied to each intensity bin. This means any individual LED within a specific bin (e.g., bin Q) is guaranteed to have an intensity between 71.0 mcd and 112.0 mcd, but the actual distribution may have a ±15% deviation around the nominal bin range. Designers should select the appropriate bin based on the brightness level required for their application, taking this tolerance into account.

4. Mchanganuo wa Mviringo wa Utendaji

Ingawa maelezo ya kiufundi yanarejelea mikunjo maalum ya picha (kwa mfano Mchoro 1, Mchoro 6), tabia yake ya kawaida inaweza kuelezewa kulingana na maelezo ya kiufundi.

4.1 Mkondo wa Mwelekeo wa Moja kwa Moja dhidi ya Voltage ya Mwelekeo wa Moja kwa Moja (Mviringo wa I-V)

For AlInGaP LEDs such as the LTST-C281KFKT, the I-V relationship is exponential, similar to a standard diode. The temperature coefficient of the forward voltage (V_F) is relatively low compared to some other LED types, but for a given current, it still decreases slightly as the junction temperature increases. The specified 2.4V (typical) V_Fat 20mA is a key parameter for drive circuit design.

4.2 Luminous Intensity vs. Forward Current

Katika safu ya kawaida ya uendeshaji (hadi kiwango cha juu cha mkondo wa moja kwa moja cha 30mA), pato la mwanga (mwangaza wa mwanga) takriban ni sawia na mkondo wa mbele. Hata hivyo, katika mikondo ya juu sana, ufanisi unaweza kupungua kwa sababu ya athari za joto zinazozidi na kupungua kwa ufanisi. Kufanya kazi kwa kiwango cha kawaida cha 20mA kunaweza kutoa usawa mzuri kati ya mwangaza na maisha ya huduma.

4.3 Temperature Characteristics

Kama LED zote, utendaji wa LTST-C281KFKT unahusiana na joto. Kwa kawaida, ukali wa mwanga hupungua kadri joto la kiungo linavyoongezeka. Wavelength kuu (λ_d) pia inaweza kuwa na mabadiliko madogo ya kuhama nyekundu (kuongezeka kwa wavelength) kwa kuongezeka kwa joto, ambayo inaweza kusababisha mabadiliko madogo ya rangi inayohisiwa. Usimamizi unaofaa wa joto katika matumizi ni muhimu kudumisha utendaji thabiti wa macho.

4.4 Usambazaji wa Wigo

Spectral output is centered at 611 nm (peak) with a half-width of 17 nm. This produces monochromatic orange light with high color purity. The spectrum does not contain the broad white light components commonly found in phosphor-converted white LEDs.

5. Mechanical and Packaging Information

5.1 Package Dimensions

This LED adopts the EIA (Electronic Industries Alliance) standard package outline. Its defining feature is an ultra-low profile with a height (H) of 0.35 mm. All dimensional drawings specify measurements in millimeters, with a standard tolerance of ±0.10 mm unless otherwise noted. The package is "water clear," meaning the encapsulant material is transparent without a diffused lens, which contributes to achieving a wide viewing angle of 130 degrees.

5.2 Polarity Identification

Mwongozo una mchoro unaoonyesha mpangilio unaopendekezwa wa pedi kwenye PCB. Mpangilio huu kwa kawaida huonyesha viunganisho vya anodi na katodi. Ulinganifu sahihi ni muhimu kwa LED kufanya kazi ipasavyo. Kutumia voltage ya kinyume inayozidi thamani ya 5V inaweza kusababisha uharibifu wa papo hapo.

5.3 Carrier Tape and Reel Packaging

Vipengele vinapatikana katika mfumo wa mkanda wa kubeba wenye upana wa milimita 8 ulio na mfumo wa matundu, umewindwa kwenye reel yenye kipenyo cha inchi 7 (milimita 178). Hii ni ufungaji wa kawaida wa usanikishaji wa SMD wa kiotomatiki. Kila reel ina vipande 5000. Mkanda una mfumo wa kufunika kwa kufunga ili kulinda vipengele kutokana na uchafuzi. Maelezo yanaonyesha kuwa mifuko miwili mfululizo ya vipengele inaweza kuwa tupu, na kiwango cha chini cha kuagiza kwa sehemu iliyobaki ni vipande 500. Ufungaji huu unalingana na kiwango cha ANSI/EIA-481.

6. Soldering and Assembly Guide

6.1 Reflow Soldering Temperature Profile

Inatoa mchoro wa joto wa kupokanzwa tena kwa mionzi ya infrared (IR) uliopendekezwa kwa mchakato usio na risasi. Vigezo muhimu vinajumuisha:

• Upashio joto:Kuongeza joto hadi kati ya 150°C na 200°C.
• Wakati wa kuchochea:Kwa upeo wa sekunde 120, ili kuipasha joto kwa usawa solder paste na kuyeyusha solvents.
• Kiwango cha joto cha kilele:Kiwango cha juu cha 260°C.
• Muda juu ya mstari wa kioevu:Muda wa juu ambao LED inapaswa kukabili joto la kilele ni sekunde 10. Mpango wa mkunjo huu unafuata kiwango cha JEDEC ili kuhakikisha muundo thabiti wa mnyororo usioharibu kifuniko cha LED. Ni muhimu kufuata mapendekezo ya mtengenezaji wa wino wa kuuza na kufanya uchambuzi wa sifa maalum kwa bodi, kwani muundo tofauti wa PCB na nyenzo zinaweza kuathiri mkunjo wa joto.

6.2 Manual Soldering

Ikiwa ni lazima kufanya ushonaji wa mikono, tumia chuma cha kuchomea chenye joto lisiozidi 300°C. Muda wa mguso kwa kila kiungo cha kuunganishwa usizidi sekunde 3, na kila pedi ya kuunganishwa ifanywe mara moja tu, ili kuzuia LED kukabiliwa na mkazo wa joto.

6.3 Storage Conditions

Uhasibu sahihi ni muhimu kwa kudumisha uwezo wa kuunganishwa kwa mbinu ya kuuza na kuzuia uharibifu unaosababishwa na unyevunyevu wakati wa upakiaji tena (athari ya popcorn).

• Ufungaji uliowekwa muhuri:LED zilizo kwenye mfuko asili wa kuzuia unyevu wenye dawa ya kukaushia zinapaswa kuhifadhiwa chini ya hali ya ≤30°C na ≤90% unyevunyevu jamaa (RH). Urefu wa maisha unaopendekezwa chini ya hali hizi ni mwaka mmoja.
• Imefunguliwa ufungashaji:Mara tu mfuko wa kizuizi cha unyevunyevu unapofunguliwa, vipengele vinapaswa kuhifadhiwa chini ya hali ya ≤30°C na ≤60% RH. Inashauriwa kukamilisha mchakato wa kulehemu kwa infrared ndani ya masaa 672 (siku 28) baada ya kufichuliwa.
• Upanuzi wa uhifadhi baada ya kufungua:Kwa uhifadhi wa zaidi ya saa 672, vipengele vinapaswa kuwekwa kwenye chombo kilichofungwa kwa kikaushio au kikaushio cha nitrojeni. Ikiwa kifungua kimehifadhiwa kwa zaidi ya saa 672, inahitajika kukaanga kwa angalau saa 20 kwenye takriban 60°C kabla ya kuchomea, ili kuondoa unyevu uliovutwa.

6.4 Cleaning

Ikiwa usafishaji baada ya kuchomea unahitajika, tumia tu kutengenezea kwa msingi wa alkoholi uliobainishwa. Kuzamisha LED kwenye ethanol au isopropanol kwa chini ya dakika moja kwenye joto la kawaida kunakubalika. Kutumia vikaushaji vikemikali visivyobainishwa kunaweza kuharibu nyenzo za kufunga LED.

7. Mapendekezo ya Utumiaji

7.1 Typical Application Scenarios

LED hii inafaa kwa kuonyesha hali, taa ya nyuma ya ikoni ndogo au alama, na mwanga wa jopo katika bidhaa mbalimbali za matumizi ya kaya na viwanda. Kwa mfano, kiashiria cha nguvu kwenye router/modem, taa ya nyuma ya vifungo kwenye kifaa cha kudhibiti umbali au vifaa vya umeme, na taa za hali kwenye vifaa vya ziada vya kompyuta. Muundo wake mwembamba unaufanya kuwa chaguo bora kwa vifaa vya kisasa vyenye nafasi ndani ya thamani kama vile simu janja, kompyuta kibao, na kompyuta mkononi.

7.2 Drive Circuit Design

LED is a current-driven device. To ensure uniform brightness, especially when multiple LEDs are connected in parallel, it is strongly recommended to connect a current-limiting resistor in series with each LED. A simple drive circuit consists of a voltage source (V_CC), mtego wa mfululizo (R_S) na LED. Thamani ya mtego inaweza kuhesabiwa kwa kutumia sheria ya Ohm: R_S= (V_CC- V_F) / I_F, ambapo V_Fni voltage ya mbele ya LED (hifadhi ya muundo hutumia 2.4V), I_Fni mkondo unaohitajika wa uendeshaji (mfano 20mA). Usanidi huu hutoa udhibiti thabiti wa mkondo na kulinda LED dhidi ya mipigo ya mkondo.

7.3 Mazingatio ya Ubunifu

• Ulinzi dhidi ya Umeme wa Tuli (ESD):AlInGaP LED ni nyeti kwa umeme wa tuli (ESD). Utaratibu wa usindikaji lazima ujumuishe tahadhari zinazofaa za kuzuia ESD: tumia mkanda wa mkono, matandiko ya kuzuia umeme tuli, na vifaa vilivyowekwa ardhini. LED yenyewe inaweza isiwe na ulinzi wa ESD uliojumuishwa, kwa hivyo katika mazingira yanayoweza kushambuliwa na ESD, ulinzi wa kiwango cha saketi (k.m., diodi ya kukandamiza voltage ya muda mfupi) unaweza kuhitajika.
• Usimamizi wa Joto:Ingawa matumizi ya nguvu ni ya chini (kiwango cha juu cha 75 mW), kuhakikisha upoaji wa joto unaofaa kupitia pedi za shaba za PCB ni muhimu kudumisha uaminifu wa muda mrefu na utoaji thabiti wa mwanga, hasa chini ya hali ya joto kali ya mazingira au wakati wa kufanya kazi karibu na kiwango cha juu cha sasa.
• Ubunifu wa optiki:Mtazamo mpana na ufungaji wa uwazi kama maji unamaanisha kuwa mwanga hutolewa kwa njia ya mtawanyiko. Kwa matumizi yanayohitaji boriti iliyoelekezwa zaidi, lenzi ya nje au sahani ya kuongoza mwanga inaweza kuhitajika.

8. Ulinganishi wa Kiufundi na Tofauti

LTST-C281KFKT inafanya kazi hasa kupitia0.35 mm unene wa juu sanaInafanya tofauti, hii ni nyembamba zaidi kuliko LED nyingi za chipu za kawaida (kwa mfano kifurushi cha 0603 au 0402, urefu kawaida ni 0.55-0.65 mm). Hii ni faida muhimu kwa vifaa vya kisasa vinavyobebeka na vinavyovaliwa. InatumiaAlInGaP technology, ikilinganishwa na teknolojia za zamani kama GaAsP, hutoa ufanisi wa juu wa kutolea mwanga na uthabiti bora wa joto kwa rangi ya machungwa/nyekundu. Uwiano wake na mchakao wa kawaidalead-free process infrared reflow solderingas well asTape and reel packagingIts compatibility aligns with high-volume, automated manufacturing, providing a cost-effective solution for mass production.

9. Maswali Yanayoulizwa Mara kwa Mara (Kulingana na Vigezo vya Kiufundi)

Q1: Je, naweza kutumia pato la mantiki la 3.3V au 5V kuendesha LED hii moja kwa moja?
A: Hapana. Lazima utumie kipingamizi cha mfululizo cha kudhibiti mkondo. Kwa mfano, ukifaa chanzo cha 3.3V na mkondo wa lengo wa 20mA, thamani ya kipingamizi itakuwa takriban (3.3V - 2.4V) / 0.02A = 45 ohms. Kuendesha moja kwa moja kunaweza kuzidi mkondo wa juu zaidi na kuharibu LED.

Q2: What is the difference between Peak Wavelength (611nm) and Dominant Wavelength (605nm)?
A: Peak Wavelength is the actual highest point on the spectral output curve. Dominant Wavelength is a calculated value in color science that represents the perceived color as a single wavelength. For this orange LED, the two values are close, confirming a saturated color.

Q3: The bin code is "Q". What exact brightness can I expect?
A: Wakati unapopima kwa 20mA, unaweza kutarajia nguvu ya mwanga kuwa kati ya 71.0 mcd hadi 112.0 mcd. Kwa sababu ya uvumilivu wa kiwango cha +/-15%, thamani halisi ya LED yoyote moja inaweza kuwa mahali popote ndani ya safu hiyo. Kwa matumizi muhimu ya kuendana na mwangaza, kupima na kuchagua kunaweza kuhitajika.

Q4: Je, "angle ya mtazamo ya digrii 130" inaeleweka vipi?
A: Hii inamaanisha kuwa ikiwa utatazama LED kutoka juu kabisa (0°), utaona mwangaza wa juu zaidi. Unapotoka kwenye mhimili, mwangaza utapungua. Kwa pembe ya kupotoka katikati ya digrii 65 (130°/2), mwangaza utakuwa nusu ya thamani ya mhimili. Zaidi ya pembe hii, mwanga bado unaonekana.

10. Mifano Halisi ya Ubunifu na Matumizi

Mfano: Ubunifu wa Kiashiria cha Hali kwa Spika ya Bluetooth ya Kubebeka
Mbunifu alihitaji LED ya machungwa yenye mwanga mkali na utumiaji wa nguvu mdogo ili kuonyesha hali ya "Kuchaji". PCB kuu ya spika ilikuwa na kikomo cha unene, na LED ililazimika kuwekwa nyuma ya kipande nyembamba cha plastiki cha kusambaza mwanga.

Utekelezaji:LTST-C281KFKT was selected for its 0.35 mm height, suitable for mechanical stacking. The drive circuit utilizes the existing 3.3V system power rail. The series resistor is calculated as 47 ohms (standard value): (3.3V - 2.4V) / 0.02A ≈ 45 ohms, providing approximately 19mA current. The 130° wide viewing angle ensures the charging indicator is visible from various angles of the speaker. The LED comes in tape and reel packaging, facilitating automated assembly during mass production. The designer specified R bin or higher to the supplier to guarantee high brightness visibility even in well-lit rooms.

11. Utangulizi wa Kanuni za Kiufundi

The LTST-C281KFKT is based on AlInGaP semiconductor technology. This material is a III-V compound semiconductor. When a forward voltage is applied across the p-n junction, electrons and holes are injected into the active region. Their recombination releases energy in the form of photons (light). The specific composition of aluminum, indium, gallium, and phosphorus in the lattice determines the bandgap energy, which directly dictates the wavelength (color) of the emitted light. For this LED, the bandgap is engineered to produce photons in the orange spectrum (approximately 605-611 nm). The water-clear epoxy encapsulant protects the semiconductor chip, provides mechanical stability, and acts as the primary optical element, shaping the light output pattern.

12. Technology Trends

Mwelekeo wa LED za kiashiria kama LTST-C281KFKT unaendelea kuelekeaKupunguzwa kwa ukubwa(Smaller footprint and thinner form factor) development to achieve more stylish product designs.Improve efficiency(More light output per mA of current) is a continuous driving force to reduce power consumption in battery-powered devices. At the same time, attention is also paid toKuboresha usawa wa rangi na uainishaji mkali zaidi, ili kukidhi mahitaji ya matumizi ambapo LED nyingi lazima zilingane kikamilifu. Zaidi ya hayo, ikilinganishwa naAdvanced packaging和Driver ICIntegration in multi-chip modules is an emerging trend for smart lighting applications, but for simple indicator lights, discrete components like this LED remain highly cost-effective and versatile.