LTD-4830CKG-P LED Display Datasheet - 0.39-inch Digit Height - AlInGaP Green - 2.6V Forward Voltage - English Technical Document

1. Bayanin Samfur

LTD-4830CKG-P na'urar haɗawa ta saman (SMD) ce mai nuni na LED mai lambobi biyu, sassa bakwai. Babban aikace-aikacenta shine don karanta lambobi a cikin kayan aikin lantarki. Tsarin ginshiƙanta yana amfani da kayan semiconductor na Aluminium Indium Gallium Phosphide (AlInGaP) da aka girma bisa tushen Gallium Arsenide (GaAs), wanda aka ƙera don fitar da haske kore. Nunin yana da fuskar launin toka da sassa farare, haɗin da aka tsara don haɓaka bambanci da karantawa a ƙarƙashin yanayin haske daban-daban.

1.1 Siffofi na Muhimmanci da Fa'idodi na Asali

• Tsawon Lamba: 0.39 inches (10.0 mm), e nufanya kuonekana kwa uwazi.
• Muundo wa Sehemu: Sehemu zilizo sawa na zinazoendelea kwa muonekano bora wa herufi na uwezo wa kusomeka.
• Ufanisi wa Nguvu: Mahitaji ya chini ya nguvu, inafaa kwa matumizi ya betri au yanayozingatia nishati.
• Utendaji wa Macho: Mwangaza wa juu na uwiano mkubwa wa tofauti.
• Pembe ya Kuangalia: Wide viewing angle ensures readability from various positions.
• Reliability: Solid-state reliability with no moving parts.
• Quality Control: Devices are categorized (binned) for luminous intensity, ensuring consistency in brightness across production batches.
• Environmental Compliance: Lead-free package compliant with RoHS (Restriction of Hazardous Substances) directives.

1.2 Gano Na'ura da Saita

The part number LTD-4830CKG-P specifies a Common Anode configuration with AlInGaP Green LED chips. The "Rt. Hand Decimal" notation indicates the inclusion and positioning of a right-hand decimal point for each digit.

2. Ma'auni na Fasaha: Zurfin Fassarar Manufa

2.1 Matsakaicin Matsakaici na Cikakke

These ratings define the limits beyond which permanent damage to the device may occur. Operation should always be maintained within these boundaries.

• Power Dissipation per Segment: 70 mW maximum.
• Peak Forward Current per Segment: 60 mA (under pulsed conditions: 1/10 duty cycle, 0.1ms pulse width).
• Continuous Forward Current per Segment: 25 mA at 25°C. This rating derates linearly at 0.28 mA/°C as ambient temperature (Ta) increases above 25°C. This is a critical design parameter for thermal management.
• Operating & Storage Temperature Range: -35°C to +105°C.
• Soldering Temperature: Iron soldering is specified at 260°C for a maximum of 3 seconds, with the iron tip positioned at least 1/16 inch below the seating plane of the component.

2.2 Electrical & Optical Characteristics

These are the typical and guaranteed performance parameters measured at Ta=25°C.

• Average Luminous Intensity (I_V): Ranges from 201 µcd (Min) to 650 µcd (Typ) at a forward current (I_F) of 1 mA. At I_F=10 mA, the typical intensity is 7150 µcd. This non-linear relationship highlights the efficiency of the LED material.
• Forward Voltage per Chip (V_F): Typically 2.6V, with a maximum of 2.6V at I_F=20 mA. The minimum is 2.05V. Circuit design must account for this range to ensure consistent current drive.
• Peak Emission Wavelength (λ_p): 571 nm (typical). This is the wavelength at which the emitted optical power is greatest.
• Dominant Wavelength (λ_d): 572 nm (typical). This is the single wavelength perceived by the human eye, defining the green color point.
• Spectral Line Half-Width (Δλ): 15 nm (typical). This indicates the spectral purity or bandwidth of the emitted light.
• Reverse Current (I_R): Maximum 100 µA at a reverse voltage (V_R) of 5V. Important Note: This parameter is for test purposes only; the device is not designed for continuous operation under reverse bias.
• Luminous Intensity Matching Ratio: Maximum 2:1 for segments within a similar light area at I_F=1mA. This ensures uniformity in brightness across the display.
• Cross Talk: Specification is ≤ 2.5%, minimizing unwanted illumination of non-driven segments.

3. Binning System Explanation

The datasheet explicitly states that devices are "Categorized for Luminous Intensity." This means the LEDs are tested and sorted (binned) based on their measured light output at a standard test current (likely 1 mA or 10 mA as per the characteristics table). This process guarantees that displays within the same order or batch will have closely matched brightness levels, which is crucial for applications requiring uniform appearance. Designers should consult the manufacturer for specific bin codes and available intensity ranges for procurement.

4. Ayyana Ayyana Bincike

Yayin da aka yi nuni da takamaiman bayanan hoto a cikin PDF ("Yanayin Lantarki / Yanayin Yanayin Gani na Al'ada"), bayanan rubutu suna ba da damar yin bincike:

• IV (Dangantakar Halin Yanzu-Ƙarfin Lantarki): Ƙarfin lantarki na gaba (V_F) an ƙayyade shi a takamaiman halin yanzu (20mA). A aikace, V_F yana da alaƙar logarithmic tare da halin yanzu da ƙimar zafin jiki mara kyau (yana raguwa yayin da zafin jiki ya tashi).
• Ƙarfin Hasken Haske da Halin Yanzu: Bayanan sun nuna gagarumin haɓakar ƙarfi daga 1mA zuwa 10mA (daga ɗaruruwa zuwa dubunnan µcd), suna nuna babban ingancin fasahar AlInGaP. Lanƙwasa yawanci yana da babban layi a ƙananan halin yanzu kuma yana iya zama ƙaramin layi a babban halin yanzu saboda zafi da raguwar inganci.
• Dogaro da Yanayin Zafi: The derating of continuous current (0.28 mA/°C) is a direct indicator of thermal limitations. Luminous intensity for AlInGaP LEDs generally decreases with increasing junction temperature.

5. Mechanical and Package Information

5.1 Girman Kunshin

The device is housed in an SMD package. Critical dimensional tolerances are ±0.25 mm unless otherwise specified. Key quality notes include limits on foreign material, ink contamination, bubbles within the segment area, and plastic pin burrs, all aimed at ensuring optical quality and reliable solderability.

5.2 Haɗin Fil da Gano Polarity

The display has a 20-pin configuration. It features a Common Anode Tsarin gine-gine. Kowane lamba yana da nasa fil ɗin anode na gama-gari (fil ɗin 3, 8, 13, 18), kuma an raba katod ɗin sashe na mutum ɗaya (A-G, DP) a cikin lambobi bisa ga teburin pinout. Tabbatar da gano filayen anode na gama-gari yana da mahimmanci don ƙirar da'ira mai kyau, domin za a haɗa su zuwa ƙarfin wutar lantarki ta hanyar masu iyakancewar halin yanzu.

5.3 Internal Circuit Diagram & Recommended Soldering Pattern

Zanen ciki yana nuna haɗin gwiwar guntuwar LED a cikin kunshin. An ba da tsarin gyarar da aka ba da shawara (tsarin ƙasa) don tabbatar da samuwar haɗin gwiwar gyarar da kyau, kwanciyar hankali na injiniya, da kuma taimakon zafi yayin aikin sake kwarara.

6. Jagororin Solder da Haɗawa

6.1 Umarnin Solder Reflow SMT

• Iyakar Tsari: Kayan aikin na iya fuskantar gyarar sake kwarara sau biyu kawai. Cikakken zagayowar sanyaya zuwa yanayin yanayi na al'ada ya zama dole tsakanin aikin sake kwarara na farko da na biyu.
• Bayanin Martaba: A recommended reflow profile is provided:
  • Pre-heat: 120–150°C.
  • Pre-heat Time: Maximum 120 seconds.
  • Peak Temperature: Maximum 260°C.
  • Time Above Liquidus: Matsakaicin daƙiƙa 5.
• Siyayya da Hannu: Idan ana amfani da ƙarfe na siyarwa, zafin ƙarshen bai kamata ya wuce 300°C ba, kuma lokacin tuntuɓar ya kamata a iyakance zuwa daƙiƙa 3 mafi girma.

6.2 Hancin Danshi da Ajiya

Ana jigilar kayan a cikin fakitin hana danshi. Dole ne a adana su a ≤30°C da ≤60% Danshi Dangi (RH). Da zarar an buɗe jakar da aka rufe, kayan sun fara ɗaukar danshi daga muhalli. Idan an fallasa su ga yanayin muhalli fiye da iyakokin da aka ƙayyade, su dole ne a gasa kafin sake kwarara don hana "popcorning" ko rabuwar ciki da sauri saboda faɗaɗa tururi yayin siyarwa.

• Yanayin Gasa:
  • Abubuwan da ke kan reel: 60°C na ≥48 hours.
  • Abubuwan da ke cikin babban yawa: 100°C na ≥4 hours ko 125°C na ≥2 hours.
• Muhimmanci: Gasasshen tandabari ya kamata a yi sau ɗaya kawai.

7. Bayanin Marufi da Oda

7.1 Ƙayyadaddun Marufi

Ana samar da na'urar a kan tef da reel don haɗawa ta atomatik.

• Reel Dimensions: Standard 13-inch reel.
• Quantity per Reel: 550 pieces.
• Minimum Order Quantity (MOQ) for Remainders: 200 pieces.
• Carrier Tape: An baƙi don aljihu wanda ke riƙe da kayan aikin an ƙayyade.
• Jagora da Kaset na Trailer: Mafi ƙarancin tsayin 400mm da 40mm, bi da bi, ana buƙata don ciyarwar inji.

8. Application Suggestions and Design Considerations

8.1 Target Applications

Wannan nuni an yi niyya ne don na'urorin lantarki na yau da kullun ciki har da, amma ba'a iyakance ga, kayan aikin ofis, na'urorin sadarwa, kayan aikin gida, allunan kayan aikin ma'auni, da na'urorin lantarki na mabukaci inda ake buƙatar karatun lambobi.

8.2 Critical Design Considerations

• Hanyar Tuƙi: Ana ba da shawarar ƙarfafa tuki na yau da kullun. sama da ƙarfin wutar lantarki don tabbatar da daidaiton ƙarfin haske a cikin raka'a da kuma canjin yanayin zafi. Dole ne a tsara da'irar don ɗaukar cikakken V_F kewayon (2.05V zuwa 2.6V) don isar da ƙayyadaddun halin yanzu ga duk na'urori.
• Iyakance Halin Yanzu: Dole ne a zaɓi amintaccen halin yanzu na aiki bayan la'akari da cikakkun ƙididdiga, musamman rage ƙimar yanayin zafi. Wuce waɗannan iyakokin zai haifar da lalacewar fitar da haske mai tsanani ko gazawar da ba ta daɗe ba.
• Kariya daga Juriya Wutar Lantarki: Dole ne da'irar tuƙi ta haɗa da kariya daga juriya wutar lantarki da ƙwanƙwasa ƙarfin wutar lantarki a lokacin kunna wuta ko jerin kashewa, kamar yadda LEDs ke da ƙananan juriya na rushewa.
• Gudanar da Thermal: Tsarin PCB wanda ya dace don kawar da zafi ya zama dole, musamman lokacin aiki kusa da iyakar ƙididdiga ko a cikin yanayin yanayi mai girma, saboda ƙayyadaddun ƙayyadaddun ƙimar yanzu.

8.3 Cautions and Reliability

Takardar bayanan ta ƙunshi gargadi bayyanannu game da amfani a cikin aikace-aikacen mahimmanci na aminci (jiragen sama, likita, sufuri). Don irin waɗannan aikace-aikace, ana buƙatar tuntubar mai kera kafin ƙira. Mai kera ba ya da alhakin lalacewa sakamakon aiki a waje da ƙayyadaddun ƙayyadaddun iyaka ko kuma rashin amfani da samfurin.

9. Technical Comparison and Differentiation

LTD-4830CKG-P ya bambanta kansa ta hanyar sifofi masu mahimmanci da yawa waɗanda suka zama gama gari ga nunin LED na zamani na SMD:

• Fasahar Kayan (AlInGaP): Yana ba da inganci mafi girma da kwanciyar hankali na zafi fiye da tsofaffin fasahohi kamar GaP na yau da kullun, wanda ke haifar da haske mafi girma da launi mafi daidaito.
• SMD Package: Yana ba da damar haɗa kayan aikin tsari ta atomatik, rage farashin masana'antu da inganta amincin ƙira fiye da na ramukan huda.
• Intensity Binning: Yana ba da tabbataccen daidaiton haske, wanda ke da muhimmiyar fa'ida ga nunin lambobi da yawa inda daidaiton gani ya fi muhimmanci.
• RoHS Compliance: Yana cika ka'idojin muhalli na duniya, yana mai da shi dacewa ga kasuwa mai faɗi.

10. Frequently Asked Questions (FAQ) Based on Technical Parameters

10.1 What is the purpose of the "Common Anode" configuration?

A cikin nunin anode na gama-gari, duk anodes na LEDs na lamba suna haɗuwa tare zuwa fil ɗaya (anode na gama-gari), wanda aka haɗa shi da samar da inganci. Ana kunna sassai ɗaya ta hanyar amfani da siginar ƙasa (ƙasa) ga filayen cathode ɗinsu ta hanyar resistor mai iyakancewar ƙarfi. Wannan tsarin sau da yawa yana sauƙaƙa da'irori masu yawa a cikin ƙirar tushen microcontroller.

10.2 Why is constant current drive recommended?

LEDs na'urori ne masu tuƙi na yanzu. Fitowar haskensu yayi daidai da gaba na yanzu, ba ƙarfin lantarki ba. Ƙarfin lantarki na gaba (V_F) yana da haƙuri kuma yana bambanta da zafin jiki. Tushen yanzu na yau da kullun yana tabbatar da cewa an kiyaye haske da ake so ba tare da la'akari da bambance-bambancen V ba_F daga na'ura zuwa na'ura ko saboda canje-canjen zafin jiki, yana haifar da ƙarin daidaito da aikin da ake iya hasashe.

10.3 Ta yaya zan iya ƙididdige ƙimar resistor mai iyakancewa na yanzu?

Don tuƙin resistor mai sauƙi tare da anode na gama-gari da aka haɗa zuwa V_CC, the resistor value (R) for each segment cathode is calculated as: R = (V_CC - V_F - V_OL) / I_F. Where V_CC is the supply voltage, V_F is the forward voltage of the LED (use max value for worst-case current calculation), V_OL is the output low voltage of the driving IC (e.g., microcontroller), and I_F is the desired forward current (must be ≤ the maximum continuous current rating, considering derating).

10.4 Me zai faru idan na wuce matsakaicin zafin sayarwa ko lokaci?

Zafi yan zafi mai yawa a lokacin gini na iya haifar da lalacewar da ba za a iya gyara ba ga haɗin wayoyi na ciki, guntuwar LED kanta, ko kuma fakitin filastik, wanda ke haifar da gazawar nan take ko kuma rage amincin dogon lokaci sosai. Koyaushe ku bi ƙayyadaddun bayanan sake kwararar da iyakokin gini na hannu.

11. Zane na Aiki da Hali na Amfani

Labari: Zana karatun zafin jiki mai lambobi biyu don kayan amfanin gida.

1. Zaɓi: An zaɓi LTD-4830CKG-P saboda girman lamba 0.39" (ganuwa mai kyau), launin kore (wanda sau da yawa ke da alaƙa da matsayin "a kunne" ko "na al'ada"), da kuma fakitin SMD don haɗawa ta atomatik.
2. Zane na Tsari: Filogin anode guda huɗu (na lambobi biyu) an haɗa su zuwa filogin GPIO akan microcontroller da aka saita azaman buɗe-drain ko tare da transistor na jeri. Kowane cathode na sashe 7 (ban da maki goma biyu) an haɗa shi zuwa wasu filogin GPIO ta hanyar kowane resistors mai iyakancewar ƙarfin lantarki. Ƙimar resistor an ƙididdige ta bisa tsarin wutar lantarki 3.3V ko 5V da niyya ta I_F of 10-15 mA for adequate brightness.
3. PCB Layout: The recommended soldering pattern from the datasheet is used in the PCB footprint. Adequate copper pour around the pads aids in heat dissipation.
4. Firmware: The display is multiplexed. The firmware rapidly cycles between enabling Digit 1 (setting its common anode high/turning on its transistor) while driving the correct cathode pattern for Digit 1's value, then disabling Digit 1, enabling Digit 2, and driving Digit 2's pattern. This happens faster than the human eye can perceive, creating the illusion of both digits being lit simultaneously.
5. Manufacturing: Components are stored in a dry cabinet after the reel is opened. The PCB undergoes a single reflow process adhering to the specified temperature profile.

12. Gabatarwar Ka'idar Aiki

Light Emitting Diodes (LEDs) are semiconductor p-n junction devices. When a forward voltage is applied, electrons from the n-type region and holes from the p-type region are injected into the junction region (the active layer). Here, electrons recombine with holes, releasing energy in the form of photons (light). The specific wavelength (color) of the emitted light is determined by the energy bandgap of the semiconductor material used in the active layer. The LTD-4830CKG-P uses AlInGaP (Aluminium Indium Gallium Phosphide), which has a bandgap corresponding to green light (~572 nm). The seven-segment format is created by arranging multiple individual LED chips (or chip segments) within a single plastic package, with their electrical connections routed to the external pins.

13. Trends da Yanayin Fasaha

AlInGaP LED technology represents a mature and highly efficient solution for red, orange, amber, and green LEDs. Key trends in the display segment include:

• Miniaturization: Continued reduction in digit height and package size for higher-density displays and smaller devices.
• Higher Efficiency: Ongoing material and process improvements yield higher luminous efficacy (more light output per watt of electrical input), enabling brighter displays or lower power consumption.
• Enhanced Reliability: Ingineering ya packaging materials, wire bonding, na encapsulation techniques inaleta maisha marefu ya uendeshaji na utendaji bora katika mazingira magumu (joto, unyevu).
• Ujumuishaji: Ingawa maonyesho ya sehemu tofauti yabaki muhimu, kuna mwelekeo sambamba kuelekea moduli zilizojumuishwa za kiendeshi-na-onyesho na paneli za picha za dot-matrix zinazotoa kubadilika zaidi, ingawa mara nyingi kwa gharama na utata wa juu.

LTD-4830CKG-P iko ndani ya hali hii kama sehemu ya kuaminika, yenye utendaji wa hali ya juu kwa matumizi ambapo usomaji maalum wa nambari hutoa usawa bora wa gharama, unyenyekevu, na uwazi.