LTST-T680VSWT SMD LED Datasheet - Diffused Yellow AlInGaP - 50mA - 130mW - Technical Documentation

1. Product Overview

This document provides the complete technical specifications for the LTST-T680VSWT, a Surface-Mount Device (SMD) Light-Emitting Diode (LED). This component belongs to the miniature LED series, specifically designed for automated Printed Circuit Board (PCB) assembly processes and space-constrained applications. The LED utilizes Aluminum Indium Gallium Phosphide (AlInGaP) semiconductor material to produce yellow light output, which is diffused through its lens for a wider, more uniform illumination pattern. Its primary function is to serve as a status indicator, signal light, or backlight for various electronic device front panels.

1.1 Core Advantages and Target Market

LTST-T680VSWT inatoa faida nyingi muhimu kwa utengenezaji wa kisasa wa elektroniki. Inakidhi kabisa maagizo ya RoHS (Vikwazo vya Vitu hatari), na inafaa kwa soko la kimataifa lenye kanuni kali za kimazingira. Kijenzi kinapatikana katika umbizo la kiwango cha tasnia la mkanda wa mm 8, reel ya inchi 7, na kuwezesha usakinishaji wa kukamata na kuweka kwa kasi na kiotomatiki. Muundo wake unaendana na mchakato wa IR (Infrared) reflow soldering, ambao ni mchakato wa kawaida wa usakinishaji wa PCB isiyo na risasi (Pb-free). Kifaa hiki pia kinaendana na mzunguko wa jumuishi, ikimaanisha kuwa sifa zake za umeme huruhusu muunganisho wa moja kwa moja na pini za pato za kawaida za mzunguko wa jumuishi. Sifa hizi zinaifanya kuwa chaguo bora kwa matumizi kama vile vifaa vya mawasiliano, vifaa vya otomatiki ya ofisi, vifaa vya nyumbani, mifumo ya udhibiti wa viwanda, kompyuta mkononi na vifaa vya mtandao vinavyohitaji viashiria vya kuona vinavyotegemewa na vya kompakt.

2. Uchambuzi wa kina wa Vigezo vya Teknolojia

Kuelewa kwa kina vigezo vya umeme na vya nuru ni muhimu sana kwa muundo wa mzunguko unaotegemewa na utekelezaji wa utendakazi thabiti.

2.1 Viwango vya Juu Kabisa

Viwango hivi vinabainisha mipaka ya mkazo inayoweza kusababisha uharibifu wa kudumu wa kifaa. Hakuna uhakikisho wa uendeshaji chini ya hali hizi. Viwango vya Juu Kabisa vinabainishwa kwa joto la mazingira (Ta) la 25°C.

• Power Dissipation (Pd):130 mW. This is the maximum power that the LED package can dissipate as heat without exceeding its thermal limits.
• Peak Forward Current (I_FP):100 mA. Hii ndiyo mkondo wa papo hapo wa mbele unaoruhusiwa kwa kiwango cha juu, unaruhusiwa tu chini ya hali ya msukumo yenye uwiano wa wajibu wa 1/10 na upana wa msukumo wa 0.1ms. Haipaswi kutumika kwa operesheni endelevu ya DC.
• Mkondo wa mbele wa moja kwa moja (I_F):50 mA. Hii ndiyo mkondo wa mbele endelevu unaopendekezwa kwa kiwango cha juu kwa utendaji wa kuaminika kwa muda mrefu.
• Operating Temperature Range:-40°C to +85°C. The device is designed to operate over this ambient temperature range.
• Storage Temperature Range:-40°C hadi +100°C. Kifaa kinaweza kuhifadhiwa katika anuwai hii bila kutumia nguvu ya umeme.

2.2 Electrical and Optical Characteristics

Vigezo hivi vinabainisha utendaji wa kawaida wa LED chini ya hali ya kawaida ya uendeshaji, hali ya kipimo ikiwa Ta=25°C, mkondo wa kawaida wa majaribio (I_F) ni 20mA.

• Luminous Intensity (I_V):710.0 - 1800.0 mcd (millicandela). This is a measure of the perceived power of visible light emitted in a specific direction (axial). The wide range is managed through a binning system (see Section 3). Intensity is measured using a sensor filtered to match the photopic response of the human eye (CIE curve).
• Viewing Angle (2θ_1/2):120 degrees (typical). This is the full angle at which the luminous intensity drops to half of its axial value. The diffused lens creates this wide viewing angle, making the LED suitable for applications where off-axis visibility is important.
• Peak Emission Wavelength (λ_P):592 nm (typical). This is the wavelength at which the spectral power distribution of the emitted light reaches its maximum.
• Dominant Wavelength (λ_d):584.5 - 594.5 nm. This is the single wavelength that best represents the perceived color of the light, derived from the CIE chromaticity diagram. It is a key parameter for color specification.
• Upanaaji wa nusu ya mstari wa wigo (Δλ):15 nm (kawaida). Hii ni upanaaji wa wigo (Upanaaji wa Nusu ya Urefu Mzima - FWHM) uliopimwa kwenye nusu ya kiwango cha juu cha nguvu. Thamani ya 15nm inaonyesha rangi ya manjano iliyosafishwa kiasi.
• Voltage ya mbele (V_F):2.1V (kawaida), kwa I_FMaximum 2.6V at =20mA. This is the voltage drop across the LED when the forward current flows. It is a key parameter for designing the current limiting circuit.
• Reverse Current (I_R):At V_RMaximum 10 μA at =5V. This parameter is for quality assurance testing only. The device is not designed to operate under reverse bias; applying a reverse voltage may damage it. In circuits where reverse voltage may occur, external protection (e.g., a diode in parallel) may be required.

3. Mfumo wa Uainishaji Maelezo

Ili kuhakikisha uthabiti katika uzalishaji wa wingi, LED zimegawanywa katika vikundi vya utendaji au "vyeo" kulingana na vigezo muhimu. Hii inawawezesha wasanifu kuchagua vipengele vinavyokidhi mahitaji maalum ya usawa wa rangi na mwangaza katika matumizi yao.

3.1 Voltage ya Mbele (V_f) Kugawanya

LEDs are binned according to their forward voltage at 20mA. The bin codes, minimum and maximum values are as follows. The tolerance within each bin is ±0.1V.

• D2:1.8V (Min) - 2.0V (Max)
• D3:2.0V (minimum) - 2.2V (maximum)
• D4:2.2V (minimum) - 2.4V (maximum)
• D5:2.4V (minimum) - 2.6V (maximum)

3.2 Luminous Intensity (I_V) Kugawanya

LEDs are binned according to their axial luminous intensity at 20mA. The tolerance within each bin is ±11%.

• V1:710.0 mcd (minimum) - 900.0 mcd (maximum)
• V2:900.0 mcd (minimum) - 1120.0 mcd (maximum)
• W1:1120.0 mcd (minimum) - 1400.0 mcd (maximum)
• W2:1400.0 mcd (minimum) - 1800.0 mcd (maximum)

3.3 Dominant Wavelength (W_d) Kugawanya

LEDs are binned according to their dominant wavelength at 20mA to ensure color consistency. The tolerance within each bin is ±1nm.

• H:584.5 nm (minimum) - 587.0 nm (maximum)
• J:587.0 nm (minimum) - 589.5 nm (maximum)
• K:589.5 nm (minimum) - 592.0 nm (maximum)
• L:592.0 nm (minimum) - 594.5 nm (maximum)

4. Performance Curve Analysis

The graphical data provides in-depth insights into how LED characteristics change with operating conditions. The datasheet contains typical curves for the following relationships (at 25°C unless otherwise noted).

4.1 Forward Current vs. Forward Voltage (I-V Curve)

This curve illustrates the nonlinear relationship between the current flowing through an LED and the voltage across its terminals. It is crucial for selecting the appropriate current-limiting method (resistor or constant current driver). The curve will show the "turn-on" voltage and how V_Fvaries with I_F.

increases.

4.2 Luminous Intensity vs. Forward Current

Mkunjo huu unaonyesha jinsi pato la mwanga (katika mcd) linavyobadilika kwa uwiano na sasa inayosukumwa. Kwa kawaida huwa laini ndani ya safu fulani, lakini hujaa kwenye sasa za juu. Hii inasaidia wabunifu kufikia usawa kati ya mahitaji ya mwangaza na matumizi ya nguvu na usimamizi wa joto.

4.3 Mwangaza wa Mwanga dhidi ya Joto la Mazingira

This curve illustrates the thermal derating of light output. As the ambient temperature increases, the luminous efficiency of the LED decreases, resulting in reduced intensity at the same drive current. This is a critical consideration for applications operating in high-temperature environments.

4.4 Usambazaji wa Nguvu ya Wigo wa Jamaa_PGrafu hii inaonyesha ukubwa wa mwanga unaotolewa ndani ya anuwai ya wigo unaoonekana. Inaonyesha urefu wa wimbi la kilele (λ

~592nm) na upana wa nusu ya wigo (Δλ~15nm), ikithibitisha sifa za utoaji wa mwanga wa manjano wenye upana mwembamba wa teknolojia ya AlInGaP.

5. Mechanical and Packaging Information

5.1 Package Dimensions

This LED conforms to the EIA standard SMD package outline. All critical dimensions, including length, width, height, and lead pitch, are provided in the datasheet drawing, with a general tolerance of ±0.2mm. The lens is described as "diffused," which scatters light to achieve the specified 120-degree viewing angle.

5.2 Polarity Identification and PCB Pad Design

This component has an anode and a cathode. The datasheet contains the recommended PCB pad pattern (footprint) for infrared or vapor phase reflow soldering. Adhering to this pad layout is crucial for achieving reliable solder joints, proper alignment, and managing heat dissipation during the soldering process. Polarity is typically indicated by a marking on the component body or an asymmetric feature in the package.

6. Soldering, Assembly, and Operation Guide

6.1 Recommended Infrared Reflow Profile (Lead-Free)

• This device is qualified for lead-free soldering processes per the J-STD-020B standard. An example reflow temperature profile is provided, which includes the following key parameters:Preheat Temperature:
• 150-200°CWakati wa kukausha:
• Kwa upeo sekunde 120.Kilele cha joto la mwili:
• Juu zaidi 260°C.Muda juu ya mstari wa kioevu (TAL):
• Inashauriwa kufuata mwongozo wa JEDEC, kwa kawaida sekunde 60-150.Maximum number of passes:

Due to variations in PCB design, solder paste, and oven characteristics, this profile should serve as a target and be fine-tuned according to the specific assembly line.

6.2 Manual Soldering

• Ikiwa ni lazima kufanya ufungaji wa mkono, lazima uwe mwangalifu sana:Joto la chuma cha kuuza:
• Juu zaidi 300°C.Weld time:
• Maximum 3 seconds per pin.Times:

Only once. Repeated heating will damage the package and semiconductor.

6.3 Kusafisha

Ikiwa usafishaji baada ya kuuzuia unahitajika, tumia tu vilainishi vilivyobainishwa ili kuepuka kuharibu kifuniko cha plastiki. Njia zinazokubalika ni pamoja na kuchovya kwenye ethanol au isopropanol kwa si zaidi ya dakika moja kwenye joto la kawaida. Lazima kuepuka matumizi ya vinasaba vya kemikali visivyobainishwa.

6.4 Uhifadhi na Uvumilivu wa Unyevu

LED hupakiwa kwenye mfuko wa kinga ya unyevunyevu ulio na kivundo-kinyevu. Wakati wa kufungwa, zinapaswa kuhifadhiwa kwa ≤30°C na ≤70% unyevunyevu wa jamaa (RH) na kutumiwa ndani ya mwaka mmoja. Mara tu mfuko unapofunguliwa, vipengele vinakuwa wazi kwa unyevunyevu wa mazingira. Kiwango chao cha Uvumilivu wa Unyevunyevu (MSL) ni 3, ambayo inamaanisha lazima zifungwe kwa njia ya IR reflow ndani ya saa 168 (siku 7) baada ya kufichuliwa kwa hali ya kiwanda (≤30°C/60% RH). Ikiwa muda huu unazidi, vipengele vinahitaji kupashwa joto (takriban 60°C, angalau saa 48) kabla ya kufungwa ili kuondoa unyevu uliokithiri, na kuzuia "popcorn" au ufa wa kifurushi wakati wa mchakato wa reflow.

7. Ufungaji na Taarifa za Kuagiza

7.1 Vipimo vya Ukanda na Reel

LTST-T680VSWT is supplied on standard 8mm wide embossed carrier tape, 7-inch (178mm) diameter reels. Each reel contains 2000 pieces. The carrier tape pockets are sealed with a cover tape. The packaging conforms to the ANSI/EIA-481 specification. The maximum allowable number of consecutive missing components in the tape is two.

8. Application Notes and Design Considerations

8.1 Driving Method_FLED is a current-driven device. To ensure uniform brightness, especially when multiple LEDs are connected in parallel, each LED should be driven by its own current-limiting resistor, or preferably by a constant current source. It is not recommended to drive LEDs directly in parallel from a voltage source, as the differences in forward voltage (V

) between individual units can lead to significant variations in current and brightness.

8.2 Thermal Management

Ingawa matumizi ya nguvu ni ya chini kiasi (kiwango cha juu cha 130mW), muundo sahihi wa joto unaweza kuongeza maisha ya LED na kudumisha pato la mwanga thabiti. Hakikisha muundo wa PCB pad unatoa utoaji wa joto wa kutosha, na epuka kutumia LED kwa mkondo wa juu kabisa (50mA) kwa mfululizo katika hali ya joto ya juu ya mazingira bila tathmini.

8.3 Upeo wa Matumizi na Uthabiti

This LED is designed for standard commercial and industrial electronic equipment. It is not specifically designed or tested for applications where failure could directly endanger life or health, such as critical medical, aviation, transportation, or security systems. For such high-reliability applications, the component manufacturer must be consulted for specific qualification data.

9. Utangulizi wa Teknolojia na Kanuni

LTST-T680VSWT inategemea teknolojia ya semikondukta ya alumini-indiamu-galiamu-fosforasi (AlInGaP). Mfumo huu wa nyenzo una ufanisi mkubwa katika kutoa mwanga katika maeneo ya nyekundu, machungwa, kahawia na manjano ya wigo. Unapotumiwa voltage ya mbele, elektroni na mashimo hujumuika katika eneo lenye ufanisi la semikondukta na kutolea nishati kwa njia ya fotoni. Muundo maalum wa safu ya AlInGaP huamua nishati ya pengo la bendi, na hivyo kuamua urefu wa wimbi (rangi) ya mwanga unaotolewa. Hakuna fosforasi ya manjano inayotumiwa; rangi ni asili ya nyenzo za semikondukta, na hivyo kufikia usafi wa rangi wa juu na uthabiti. Lenzi ya epoksi iliyotawanyika hufunga chipi ya semikondukta, hutoa ulinzi wa kiufundi, huunda boriti ya mwanga inayotolewa, na huboresha pembe ya mtazamo.

10. Practical Design and Usage Examples

10.1 Mfano: Viashiria vya Hali ya Swichi ya Mtandao

1. Katika swichi ya mtandao yenye bandari 24, kila bandari inaweza kuwa na LED nyingi (k.m., kiungo, shughuli, kasi). LTST-T680VSWT yenye pembe ya kuona ya upana wa digrii 120 ni chaguo bora kwa viashiria vya hali vya paneli ya mbele. Wabunifu watakuwa:_VKuamua mwangaza unaohitajika kulingana na umbali wa kutazama na mwanga wa mazingira. Kuchagua I inayofaa
2. Kipimo (k.m., kuchagua V2 kwa mwangaza wa kati).
3. Chagua mkondo wa kuendesha, kwa kawaida ni 10-20mA, ili kusawazisha mwangaza na matumizi ya nguvu. Kutumia IC ya kuendesha ya mkondo wa mara kwa mara kwa LED zote kuhakikisha usawa kamili.
4. Fuata kwa uangalifu mapendekezo ya nyaraka za maelezo ya kiufundi katika kubuni ufungaji wa PCB, ili kuhakikisha kuunganishwa kwa usahihi.

Fuata mwongozo wa uendeshaji wa MSL-3: Hifadhi reeli zilizofunguliwa kwenye kabati kavu, na hakikisha ukamilishaji wa usanikishaji wa bodi ya mzunguko ndani ya masaa 168 baada ya kufungua reeli.

10.2 Mfano: Mwanga wa Nyuma wa Paneli ya Swichi ya Filamu Nyembamba

1. Kwa kuangaza alama kwenye paneli ya udhibiti, uonekanaji sawa wa mhimili wa mbali ni muhimu sana. Lens iliyotawanyika ya LED hii ina faida.
2. LED itasanikishwa nyuma ya ikoni ya uwazi au iliyochongwa kwa laser kwenye paneli.
3. Pembe ya mtazamo pana inahakikisha kuwa alama zinang'aa sawasawa hata wakati LED haiko katikati kabisa nyuma ya alama.
4. Ili kufikia tone maalum la manjano, wabunifu wataelezea safu madhubuti ya urefu wa wimbi kuu (mfano, K: 589.5-592.0nm) ili kuendana na taa zingine za kiashiria au rangi za chapa.

Ikiwa unatumia tu mstari mmoja wa usambazaji wa umeme ulioimarishwa kusambaza umeme kwa LED moja au mbili, unaweza kutumia upinzani uliounganishwa mfululizo kwa urahisi kudhibiti mkondo.

11. Maswali Yanayoulizwa Mara kwa Mara (Kulingana na Vigezo vya Kiufundi)
Q1: Je, naweza kutumia kiwango cha mantiki cha 3.3V kuendesha LED hii bila kutumia upinzani wowote?No.A:_FTypical V

It is 2.1V, but can be as high as 2.6V. Connecting it directly to 3.3V will force a current limited only by the LED's dynamic resistance and the power supply, likely exceeding the absolute maximum DC current of 50mA and damaging the device. A current-limiting resistor or regulator is always required.
Q2: Je, urefu wa wimbi la kilele na urefu wa wimbi kuu ni tofauti gani?A:_P)Urefu wa wimbi la kilele (λ) ni urefu wa wimbi mmoja ambapo LED hutoa nguvu kubwa zaidi ya mwanga._d)Dominant Wavelength (λ_d) ni urefu wa wimbi la mwanga mmoja ambao linaonekana kwa jicho la mwanadamu kuwa na rangi sawa na mwanga wa LED. λ

ni parameta inayotumika kwa udhibiti wa rangi na uainishaji.
Q3: Kwa nini kuna kikomo cha masaa 168 cha maisha ya kiwandani baada ya kufungua mfuko?

A: Plastic LED packages absorb moisture from the air. During high-temperature reflow soldering, this trapped moisture rapidly evaporates, generating steam pressure inside the package, which can lead to delamination or cracking ("popcorning"). The 168-hour limit and the baking procedure are safety measures against this failure mode.
Q4: How to interpret the binning code when ordering?_fA: You need to specify the part number LTST-T680VSWT, followed by your specific required V_V, I_d Na kodi za kiwango cha W (kwa mfano, kwa mwangaza wa kati na tone maalum la manjano). Tafadhali angalia mwongozo wa kuagiza wa mtengenezaji kwa muundo halisi. Ikiwa hakijabainishwa kiwango, utapokea vipengee kutoka kwa viwango vya kawaida vya uzalishaji.