LTS-4801JD LED Digital Tube Datasheet - 0.39 Inch Character Height - AlInGaP Super Red - 2.6V Forward Voltage - 70mW Power Consumption - Technical Documentation

1. Product Overview

LTS-4801JD is a high-performance, single-digit, seven-segment digital display module, specifically designed for applications requiring clear and bright numeric readouts. Its core function is to intuitively display numbers 0-9 and some letters using independently addressable LED segments. The device is designed for reliability and ease of integration into various electronic systems.

1.1 Core Advantages and Target Market

Kionyesha hiki kina faida muhimu kadhaa, kinatumika katika matumizi mbalimbali. Faida zake kuu ni pamoja na: muonekano bora wa herufi, sehemu zote zinazoendelea sawasawa; mwangaza na utofauti wa juu, unaohakikisha kuonekana bora hata katika mazingira yenye mwanga; na pembe pana ya kuona, inayohakikisha usomaji wazi kutoka nafasi tofauti. Zaidi ya hayo, kina matumizi ya nguvu ya chini na uaminifu wa hali ngumu, unaosaidia kufikia maisha marefu na ufanisi wa nishati. Kifaa hiki kimepangwa kulingana na nguvu ya mwanga, kuhakikisha usawa wa viwango vya mwangaza. Soko lengwa linajumuisha: paneli za udhibiti wa viwanda, vifaa vya kupima na kukadiria, vifaa vya matumizi ya nyumbani, dashibodi za magari (onyo la ziada) na mfumo wowote uliowekwa ambao unahitaji kuonyesha nambari zenye ukubwa mdogo na uaminifu.

2. Maelezo ya Vipimo vya Kiufundi

Utendaji wa LTS-4801JD umefafanuliwa na safu ya vigezo sahihi vya umeme na macho, ambavyo wabunifu lazima wazingatie ili kuhakikisha utekelezaji sahihi.

2.1 Tabia za Photometric na Optical

Utendaji wa macho ndio kiini cha utendakazi wake. Kifaa hiki kinatumia chip ya LED ya AlInGaP (Aluminium Indium Gallium Phosphide) ya rangi nyekundu sana. Katika mkondo wa mbele (IF) wa 1mA, nguvu yake ya wastani ya kutoa mwanga (Iv) ni kati ya 200 hadi 650 microcandela (μcd). Rangi inafafanuliwa na urefu wa wimbi la kilele la utoaji (λp) wa 650 nanometers (nm) na urefu wa wimbi kuu (λd) wa 639 nm, zote zikipimwa chini ya hali ya IF=20mA. Upana wa nusu ya mstari wa wigo (Δλ) ni 20 nm, unaonyesha rangi yake nyekundu ni safi kiasi. Uwiano wa kulinganisha nguvu ya mwanga kati ya sehemu mbalimbali ni hadi 2:1, ikihakikisha muonekano sare kwenye onyesho la nambari nzima.

2.2 Electrical Parameters

Vigezo vya umeme vinahakikisha uendeshaji salama na bora wa kifaa. Viwango vya juu kabisa vinafafanua mipaka ya uendeshaji: Nguvu inayotumiwa kwa kila sehemu ni 70mW; Upeo wa mkondo wa mbele kwa kila sehemu ni 90mA (uwiano wa mzunguko 1/10, upana wa msukumo 0.1ms); Katika 25°C, mkondo wa mbele unaoendelea kwa kila sehemu ni 25mA, na kwa kila ongezeko la digrii 1 la joto, inapaswa kupunguzwa kwa mstari kwa 0.33 mA/°C. Voltage ya juu kabisa ya nyuma kwa kila sehemu ni 5V. Chini ya hali ya kawaida ya uendeshaji (Ta=25°C, IF=20mA), anuwai ya voltage ya mbele (VF) kwa kila sehemu ni kutoka 2.1V hadi 2.6V. Wakati VR=5V, mkondo wa nyuma (IR) ni hadi 100 μA.

2.3 Thermal and Environmental Specifications

The operating temperature range of this device is -35°C to +85°C, and the storage temperature range is the same. This broad range makes it suitable for environments with significant temperature variations. The soldering temperature rating specifies that the device can withstand 260°C for 3 seconds at a point 0.116 inches (approximately 2.95 mm) below the mounting reference plane, which is crucial for the assembly process.

3. Grading System Description

The datasheet indicates that the device is "graded by luminous intensity." This means a grading system is applied, most likely based on the average luminous intensity (Iv) measured under standard test conditions (IF=1mA). Grading groups devices with similar light output levels (e.g., 200-350 μcd, 350-500 μcd, 500-650 μcd). This allows designers to select devices with consistent brightness for multi-digit displays or applications requiring strict brightness matching. The 2:1 maximum luminous intensity matching ratio specified in the datasheet is a guarantee for the performance within a single device, while grading ensures consistency across multiple devices.

4. Performance Curve Analysis

Although the provided datasheet excerpt mentions "Typical Electrical/Optical Characteristic Curves," the typical curves for such devices would graphically present key relationships critical for design.

4. Uchambuzi wa Mkunjo wa Utendaji

The typical I-V curve demonstrates the exponential relationship between forward current (IF) and forward voltage (VF) for an AlInGaP LED chip. The curve begins to conduct noticeably at approximately 1.8V-2.0V and exhibits a relatively steep slope within the normal operating range (e.g., 5-30mA), with VF rising to a typical 2.1V-2.6V at 20mA. This curve is crucial for designing current-limiting circuits.

4.2 Nguvu ya Mwanga dhidi ya Mkondo wa Mbele

Mkunjo huu ni muhimu kwa udhibiti wa mwangaza. Kwa kawaida unaonyesha kuwa, kabla ya kufikia mkondo mkubwa sana unaoweza kusheheni, nguvu ya mwanga (Iv) huongezeka takriban kwa mstari kwa upeo mkubwa kulingana na mkondo wa mbele (IF). Mwinuko wa mstari huu huamua ufanisi (lumeni kwa wati au candela kwa ampea). Wasanifu hutumia mkunjo huu kuchagua mkondo wa uendeshaji unaohitajika kufikia kiwango cha mwangaza unachotaka.

4.3 Mwangaza wa Mwanga dhidi ya Joto la Mazingira

Pato la mwanga la LED hupungua kadri joto la kiungo linavyoongezeka. Mkunjo wa kupunguza nguvu utaonyesha uhusiano wa nguvu ya mwanga ya jamaa kulingana na mabadiliko ya joto la mazingira (Ta) au joto la kiungo (Tj). Kwa LED za AlInGaP, pato linaweza kupungua kwa kiasi kikubwa kadri joto linavyoongezeka, jambo ambalo lazima lizingatiwe katika usimamizi wa joto na usanifu unaolenga mazingira ya joto la juu.

4.4 Spectral Distribution

Mchoro wa usambazaji wa nguvu wa wigo utaonyesha nguvu ya jamaa ya mwanga unaotolewa katika urefu tofauti wa mawimbi, ukizunguka urefu wa wimbi la kilele cha nanomita 650. Upana wa nusu ya wigo wa nanomita 20 unamaanisha upana wa kilele hicho katika nusu ya nguvu yake ya juu zaidi, ukithibitisha umonokromia wa mwanga mwekundu.

5. Mechanical and Packaging Information

The physical structure of LTS-4801JD is defined for its mechanical integration.

5.1 Dimensions and Outline Drawing

The character height of this package is 0.39 inches (10.0 mm). The detailed dimension drawing (referenced in the datasheet) specifies the overall package length, width, height, the dimensions and spacing of each segment, the pin pitch and length, and the position of the right-hand decimal point. Unless otherwise specified, all dimensions are in millimeters with a standard tolerance of ±0.25 mm. This drawing is crucial for creating the PCB footprint and ensuring proper fit within the enclosure.

5.2 Pin Definition and Polarity Identification

This device utilizes a 10-pin configuration. It features a common-anode architecture, meaning the anodes of all LED segments are internally connected and brought out to specific pins. The pin connections are as follows: Pin 3 and Pin 8 are the common anodes (internally connected). The cathode for each segment is on a separate pin: Pin 1 (Segment G), Pin 2 (Segment F), Pin 4 (Segment E), Pin 5 (Segment D), Pin 6 (DP, Decimal Point), Pin 7 (Segment C), Pin 9 (Segment B), Pin 10 (Segment A). The pin numbering and the location of Pin 1 must be identified from the mechanical drawing. The "Rt. Hand Decimal" note confirms the decimal point is positioned on the right side of the digit.

5.3 Internal Circuit Diagram

Mchoro wa mzunguko wa ndani uliorejelewa unaonyesha wazi usanidi wa anode ya pamoja. Utaonyesha nodi ya pamoja (anode) iliyounganishwa na chanzo cha umeme chanya, wakati cathode ya LED ya kila sehemu (A hadi G, pamoja na DP) imeunganishwa kwenye pini tofauti. Ili kuwasaa sehemu fulani, ni lazima pini yake inayolingana ya cathode isukumwe kuwa ya chini (kupitia kizuizi cha sasa kwenye ardhi), huku anode ya pamoja ikibaki katika hali ya juu.

6. Mwongozo wa Uchomeleaji na Usanikishaji

Inahitaji usindikaji sahihi ili kudumisha ukomo wa kifaa.

6.1 Vigezo vya Reflow Soldering

The key parameter provided is the maximum soldering temperature: 260°C for 3 seconds, measured at a point 0.116 inches (2.95 mm) below the seating plane. This aligns with typical lead-free reflow profiles (e.g., IPC/JEDEC J-STD-020). A standard reflow profile should be used, including preheat, rapid temperature rise, peak temperature (not exceeding 260°C within the specified time), and controlled cooling zones. This profile must ensure the temperature at the package leads does not exceed the absolute maximum rating.

6.2 Precautions and Operations

Standard ESD (Electrostatic Discharge) precautions must be observed during handling and assembly, as the LED chip is sensitive to static electricity. Avoid applying mechanical stress to the leads or plastic package. Post-soldering cleaning should use methods compatible with the package material (which may be epoxy).

6.3 Storage Conditions

The device should be stored within the specified storage temperature range of -35°C to +85°C. It is recommended to store components in a low-humidity environment and use anti-static packaging until ready for use to prevent moisture absorption and electrostatic damage.

7. Mapendekezo ya Matumizi

7.1 Typical Application Circuit

Kwa onyesho la anode ya pamoja kama vile LTS-4801JD, njia ya kawaida ya kuendesha ni multiplexing, hasa wakati wa kutumia tarakimu nyingi. Microcontroller au IC maalum ya kuendesha onyesho hutoa nguvu kwa anode ya pamoja ya kila tarakimu kwa mpangilio, wakati huo huo inatoa muundo wa cathode wa sehemu zinazopaswa kuwashwa kwenye tarakimu hiyo. Njia hii inaweza kuokoa pini za I/O. Kwa matumizi ya tarakimu moja, unaweza kutumia kuendesha rahisi zaidi ya tuli: Unganisha pini za anode ya pamoja (3 na 8) kupitia kizuizi cha sasa kwa onyesho lote kwa voltage chanya ya usambazaji (Vcc), na unganisha kila pini ya cathode (A-G, DP) kwa pini ya I/O ya microcontroller au transistor ya kuendesha. Kila pini ya I/O inahitaji kizuizi cha sasa katika mfululizo kwa sehemu yake inayolingana.

7.2 Current Limiting Resistor Calculation

Thamani ya upinzani wa udhibiti wa mkondo ni muhimu sana. Inaweza kuhesabiwa kwa kutumia Kanuni ya Ohm: R = (Vcc - VF) / IF. Kwa mfano, Vcc ni 5V, VF ya kawaida ni 2.6V, na IF inayotarajiwa ni 20mA: R = (5V - 2.6V) / 0.020A = 120 ohms. Nguvu ya kiwango cha upinzani isiwe chini ya P = (IF)^2 * R = (0.020)^2 * 120 = 0.048W, kwa hivyo upinzani wa kawaida wa 1/8W (0.125W) au 1/4W utatosha.

7.3 Mazingatio ya Ubunifu

Brightness Control:Brightness can be adjusted by varying the forward current (IF) within a specified range, for example, by changing the resistance value or using PWM (Pulse Width Modulation) on the drive signal. PWM is very effective for dimming.
Viewing Angle:A broad perspective is beneficial, but the primary viewing direction must be considered when positioning the display in the final product.
Thermal Management:Although power consumption is low, ensure adequate ventilation if using multiple displays or operating in high-temperature environments to prevent luminance degradation and extend service life.
Kuongeza Ulinganisho:Paneli ya kijivu na sehemu nyeupe hutoa ulinganisho wa asili. Kwa usomaji bora zaidi, unaweza kutumia mipaka au vichungi vyenye rangi nyeusi karibu na kionyeshi, hasa katika mwangaza wa mazingira mkali, ili kuongeza zaidi ulinganisho.

8. Ulinganishi wa Kiufundi na Tofauti

LTS-4801JD inatofautishwa hasa kupitia teknolojia yake ya AlInGaP na sifa maalum za utendaji.

Ulinganisho wa AlInGaP na teknolojia nyingine za LED:Ikilinganishwa na LED nyekundu za kawaida za GaAsP au GaP, LED za AlInGaP zina ufanisi mkubwa zaidi wa mwanga (utoaji zaidi wa mwanga kwa kila kitengo cha nguvu ya umeme), uthabiti bora wa joto, na nyekundu "super" iliyojaa zaidi. Ikilinganishwa na LED mpya zenye nguvu nyingi za mwanga mweupe zinazotumia vichungi, kifaa hiki ni rahisi zaidi, kinahitaji mzunguko rahisi zaidi wa kuendesha, na hutoa moja kwa moja mwanga mwekundu safi na wenye ufanisi.

Katika nyanja ya sehemu saba za nambari:Urefu wake wa inchi 0.39 unaufanya uwe katika kategoria ya kawaida ya saizi ya vifaa vya kusanikishwa kwenye paneli. Faida kuu za ushindani zilizoorodheshwa zinajumuisha sehemu zake zinazoendelea na sawasawa (muonekano safi), mwangaza na tofauti ya juu, na viwango vya nguvu ya mwanga (kuhakikisha uthabiti). Mahitaji ya nguvu ya chini pia ni faida kwa vifaa vinavyotumia betri.

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

Q1: Kwa nini kuna pini mbili za anodi ya kawaida (pini 3 na pini 8)?
A1: Kutumia pini mbili kwa muunganisho wa pamoja husaidia kutawanya jumla ya mkondo wa anodi (jumla ya mikondo ya sehemu zote zinazoungua). Hii hupunguza msongamano wa mkondo kwenye pini moja na njia za PCB, na kuboresha uaminifu. Zimeunganishwa ndani, kwa hivyo inatosha kuunganisha moja tu kwenye mzunguko, lakini inashauriwa kuunganisha zote mbili kwa utendaji bora zaidi.

Q2: Je, naweza kuendesha onyesho hili moja kwa moja kutoka kwa kidhibiti 3.3V bila kutumia kipingamizi cha kudhibiti mkondo?
A2: Hapana. Lazima kila wakati utumie kipingamizi cha kudhibiti mkondo (au chanzo cha mkondo thabiti) kwa kila sehemu. Voltage ya mbele (VF) kwa kawaida ni 2.1V-2.6V. Kuunganisha 3.3V moja kwa moja kwenye LED kupitia pini ya kidhibiti, kunajaribu kuendesha mkondo usiodhibitiwa na unaoweza kuharibu kupitia LED, kwani kipingamizi pekee kitakuwa ndani ya pini ya MCU na upinzani wa ndani wa LED, ambayo ni ndogo sana.

Q3: Inamaanisha nini "kupunguzwa kwa mstari kuanzia 25°C" kwa mkondo endelevu wa mbele?
A3: Hii inamaanisha kuwa joto la mazingira linapozidi 25°C, mkondo wa juu unaoruhusiwa wa mwendelezo wa mbele hupungua. Kipengele cha kupunguzwa ni 0.33 mA/°C. Kwa mfano, kwenye 50°C (joto la juu zaidi kuliko joto la kumbukumbu kwa 25°C), mkondo wa juu utakuwa 25mA - (0.33 mA/°C * 25°C) = 25mA - 8.25mA = 16.75mA. Hii inazuia joto la kupita kiasi na kuhakikisha uaminifu.

Q4: Je, uwiano wa 2:1 wa mechi ya nguvu ya mwanga unaeleweka vipi?
A4: Hii inamaanisha kuwa ndani ya kitengo kimoja cha LTS-4801JD, wakati wa kupima chini ya hali sawa (IF=1mA), mwangaza wa sehemu yenye giza zaidi haupunguki chini ya nusu ya mwangaza wa sehemu yenye mwangaza zaidi. Hii inahakikisha usawa wa kuona wa onyesho la nambari lote.

10. Mifano Halisi ya Ubunifu na Matumizi

Case: Designing a Simple Digital Voltmeter Reading Display
A designer is creating a compact digital voltmeter to display 0.0V to 19.9V. They need a clear, low-power display. They selected the LTS-4801JD for its high brightness and 0.39-inch size, which is clear and readable for the intended use. Three displays are used to show three digits. The microcontroller's ADC reads the voltage, converts it to a numerical value, and drives the displays via a multiplexing scheme, using a transistor array to control the common anodes and the MCU's I/O pins (with series resistors) to control the segment cathodes. The right decimal point of the middle digit is used to display the tenths place. AlInGaP red was chosen for its high contrast on dark panels. The designer calculated resistor values for the 5V system to drive each segment at approximately 15mA, providing ample brightness while staying well below the 25mA continuous rating at room temperature.

11. Utangulizi wa Kanuni ya Uendeshaji

LTS-4801JD inafanya kazi kulingana na kanuni ya msingi ya mwanga unaotokana na umeme katika nyenzo za semiconductor. Muundo wa chip ya AlInGaP huunda kiunganishi cha p-n. Wakati voltage chanya inayozidi kizingiti cha kiunganishi (takriban 1.8-2.0V) inatumika, elektroni kutoka eneo la aina-n na mashimo kutoka eneo la aina-p huingizwa kwenye eneo lenye ufanisi, na huko hujumuishwa tena. Katika AlInGaP, mchakato huu wa kujumuishwa tena hutolea nishati hasa kwa njia ya fotoni (mwanga) katika safu ya urefu wa mawindo nyekundu (takriban 650 nm). Kila moja ya sehemu saba (A hadi G) na nukta ya desimali (DP) ina chip moja au zaidi ndogo za LED zilizowekwa ndani ya kifurushi. Usanidi wa anodi ya pamoja hurahisisha mzunguko wa kuendesha wa nje kwa kuruhusu chanzo kimoja cha voltage chanya kuwapa nguvu sehemu zote, na kwa kuziweka katodi za sehemu zinazohitajika kwenye ardhi ili kudhibiti kwa pekee.

12. Mwelekeo wa Kiufundi na Mazingira

Onyesho la LED la sehemu saba kama LTS-4801JD linawakilisha teknolojia ya kuonyesha iliyokomaa na iliyoboreshwa sana. Ingawa teknolojia mpya kama vile OLED ya matrix ya dots au TFT LCD hutoa kubadilika zaidi (picha kamili, rangi nyingi), LED za sehemu saba bado zinabaki na faida kubwa katika maeneo maalum: mzunguko wa kuendesha ni rahisi sana, mwangaza na utofautishaji ni wa juu sana, usomaji bora chini ya jua la moja kwa moja, anuwai ya joto la uendeshaji pana, na uimara bora wa muda mrefu (hakuna kushindwa kwa taa ya nyuma). Mwelekeo ndani ya uwanja huu ni kufikia ufanisi zaidi (lumeni zaidi kwa kila watt) kwa kutumia nyenzo za hali ya juu za semiconductor kama vile AlInGaP kama inavyoonyeshwa na kifaa hiki, na kupitisha ufungaji wa kifuniko cha kushikanwa kwenye uso kwa ajili ya usanikishaji wa kiotomatiki. Bado ni suluhisho lililopendekezwa kwa matumizi ambayo mahitaji makuu ni kuonyesha nambari kwa ufanisi wa gharama, imara, na yenye usomaji wazi na rahisi.