LTS-3401LJG LED Digital Tube Datasheet - 0.8 Inch Character Height - AlInGaP Green - 2.6V Forward Voltage - Technical Documentation

1. Muhtasari wa Bidhaa

LTS-3401LJG ni sehemu ya nambari moja, iliyoundwa kwa matumizi yanayohitaji usomaji wazi na mkali wa nambari. Kazi yake kuu ni kutoa onyesho la herufi moja linalosomeka kwa urahisi kwa kutumia teknolojia ya LED thabiti. Faida kuu ya kifaa hiki ni kwamba chipi yake ya LED inatumia nyenzo za semiconductor za alumini-indiamu-galiamu-fosforasi (AlInGaP), ambazo hukua kwenye msingi usio na uwazi wa galiamu-arsenidi (GaAs). Mchanganyiko huu maalum wa nyenzo umechaguliwa kwa sababu ya ufanisi wake katika kutoa mwanga wa kijani wenye mwangaza mkubwa. Kionyeshi hiki hutumia paneli ya kijivu na alama za sehemu nyeupe, na kuimarisha tofauti na uwezo wa kusomeka chini ya hali mbalimbali za mwanga. Soko lengwa la sehemu hii ni pamoja na paneli za udhibiti wa viwanda, vifaa vya kupima na kupimia, vifaa vya matumizi ya nyumbani, na mifumo yoyote iliyojumuishwa inayohitaji kiashiria cha nambari kinachoshikamana, kinaaminika na kinachotumia nguvu kidogo.

1.1 Core Advantages

• Utendaji wa Kioo:Kifaa hiki hutoa muonekano bora wa herufi na pembe pana ya mtazamo, na kuhakikisha usomaji wazi kutoka maeneo tofauti.
• Ufanisi wa Nishati:Ina sifa ya matumizi ya nguvu ya chini na mahitaji ya nguvu ya chini, inayofaa kwa matumizi yanayotumia betri au yanayohisi matumizi ya nguvu.
• Kuaminika:Kama kifaa thabiti, ina uaminifu wa juu na maisha marefu zaidi ya maonyesho ya mitambo au taa za incandescent.
• Kusanifishwa:Ukubwa wa mwanga umepangwa kwa makundi, kuhakikisha mwangaza unaolingana katika maonyesho ya nambari nyingi. Pia inaweza kuendana moja kwa moja na viwango vya kuendesha vya mzunguko uliojumuishwa (I.C.).
• Urahisi wa Ujumuishaji:Usanifu wa ufungashaji unarahisisha usakinishaji kwenye bodi ya mzunguko wa kuchapishwa (PCB) au soketi, na kurahisisha mchakato wa kukusanya.

2. In-depth Analysis of Technical Parameters

Sehemu hii inachambua kwa kina na kwa uwazi vigezo muhimu vya umeme na vya mwanga vilivyobainishwa katika hati ya maelezo.

2.1 Absolute Maximum Ratings

These ratings define the limits beyond which permanent damage to the device may occur. Operation under these conditions is not guaranteed.

• Power dissipation per segment:70 mW. This is the maximum power that a single light-emitting segment can safely dissipate as heat under continuous operation.
• Peak forward current per segment:60 mA. This is the maximum instantaneous current allowed, typically under pulse conditions (1/10 duty cycle, 0.1ms pulse width). Exceeding this value may lead to catastrophic failure.
• Continuous forward current per segment:25 mA at 25°C. This is the maximum DC current for safe continuous operation. The datasheet specifies a derating factor of 0.33 mA/°C above 25°C, meaning the allowable current decreases as ambient temperature rises to prevent overheating.
• Reverse Voltage per Segment:5 V. Applying a reverse bias voltage higher than this value may break down the PN junction of the LED.
• Operating and Storage Temperature Range:-35°C to +85°C. This device is suitable for industrial temperature range applications.
• Soldering Temperature:260°C for 3 seconds at 1/16 inch (approximately 1.6mm) below the mounting plane. This defines the reflow soldering profile to avoid thermal damage to the LED chip.

2.2 Electrical and Optical Characteristics

Hizi ni vigezo vya kawaida vya utendaji vilivyopimwa kwa joto la mazingira (T_A) la 25°C.

• Nguvu ya wastani ya mwanga (I_V):Wakati wa mkondo wa mbele (I_F) wa 1 mA, anuwai kutoka 320 μcd (kiwango cha chini) hadi 900 μcd (kiwango cha kawaida). Kigezo hiki kinaelezea mwangaza unaohisiwa wa sehemu inayong'aa. Anuwai mpana inaonyesha uwepo wa mchakato wa kupanga au kuchuja.
• Urefu wa wimbi la kilele cha utoaji (λ_p):) kwa I_F=20mA ni 571 nm (kiwango cha kawaida). Hii ndio urefu wa wimbi ambalo nguvu ya mwanga inayoletwa ni ya juu zaidi, na huamua rangi ya kijani ya mwanga.
• Upana wa nusu ya mstari wa wigo (Δλ):15 nm (kiwango cha kawaida). Hii inapima usafi wa wigo au upana wa bendi ya mwanga unaotolewa; thamani ndogo inaonyesha pato la karibu zaidi na rangi moja (rangi safi zaidi).
• Domini wavelength (λ_d):572 nm (typical). This is the single wavelength that the human eye perceives as most closely matching the LED color, closely related to the peak wavelength.
• Forward voltage per segment (V_F):) kwa I_F=20mA, 2.05V (min) to 2.6V (max). This is the voltage drop across the LED when it is conducting. Designers must ensure the drive circuit can provide sufficient voltage.
• Reverse current per segment (I_R):At V_R=5V, 100 μA (max). This is the small leakage current that flows when the LED is reverse biased.
• Luminous intensity matching ratio (I_V-m):) kwa I_F=10mA, 2:1 (max). This key parameter ensures visual consistency in multi-segment or multi-digit displays. It specifies that the brightness difference between any two segments (or digits from different devices) will not exceed a factor of 2.

3. Bin System Description

Uainishaji unasema kifaa hiki "kimo cha mwanga kimegawanywa katika daraja." Hii inamaanisha mchakato wa kugawa daraja au uchambuzi.

• Kugawa daraja kwa kimo cha mwanga:Baada ya utengenezaji, LED hupimwa na kugawanywa katika vikundi tofauti kulingana na pato la mwanga lililopimwa chini ya mkondo wa kawaida wa kupima (k.m., 1mA au 10mA). Hii inahakikisha wabunifu wanaweza kuchagua vifaa vya kiwango sawa cha nguvu, ili kufikia usawa wa mwangaza katika onyesho zima. Uwiano maalum wa 2:1 uliobainishwa ni uvumilivu kati ya vikundi au ndani ya safu za uzalishaji.
• Kugawa daraja kwa urefu wa wimbi:Ingawa hakuna anuwai ya chini/kawaida/ya juu iliyotolewa wazi isipokuwa ya kawaida ya 571-572nm, AlInGaP LED pia hupimwa mara nyingi kulingana na urefu wa wimbi kuu ili kuhakikisha usawa wa rangi. Upana mwembamba wa wigo (15nm) unaonyesha usawa wa asili mzuri wa rangi.

4. Performance Curve Analysis

Uainishaji unarejelea "miviringo ya kawaida ya sifa za umeme/optiki." Ingawa hakuna chati maalum iliyotolewa katika maandishi, tunaweza kudhani yaliyomo na maana yake ya kawaida.

• Mkondo wa mbele dhidi ya Voltage ya mbele (Mviringo wa I-V):Chati hii itaonyesha uhusiano wa kielelezo kati ya mkondo wa LED na voltage. Ni muhimu sana kwa kubuni saketi za kudhibiti mkondo. Voltage ya kugeuka iko karibu na V ya kawaida_Fthamani ya 2.6V.
• Nguvu ya mwanga dhidi ya Mkondo wa mbele (Mviringo wa I-L):Grafu hii inaonyesha jinsi mwangaza unavyoongezeka kwa kuongezeka kwa mkondo. Kwa kawaida huwa na uhusiano wa mstari ndani ya safu fulani, lakini hujaa chini ya mikondo ya juu kutokana na athari za joto. Wasanifu hutumia grafu hii kuchagua mkondo wa uendeshaji wa kufikia mwangaza unaohitajika, huku wakiendelea kukaa ndani ya viwango vilivyopangwa.
• Nguvu ya mwanga dhidi ya Joto la Mazingira:Mviringo huu unaonyesha kupungua kwa pato la mwanga kadiri joto la kiungo linavyopanda. LED za AlInGaP kwa kawaida zina utendaji bora wa joto la juu kuliko teknolojia za zamani, lakini bado zina mgawo hasi wa joto kwa pato lao la mwanga.
• Usambazaji wa Wigo:A chart showing the relationship between relative intensity and wavelength, with a peak near 571nm and an approximately Gaussian shape with a half-width of about 15nm, confirming green light output.

5. Mechanical and Packaging Information

The LTS-3401LJG uses a standard Dual In-line Package (DIP), suitable for through-hole mounting.

• Character Height:0.8 inches (20.32 mm). This is the physical height of a single display character.
• Package Dimensions:The datasheet contains a detailed dimensional drawing (not copied here). Key features include overall length, width, pin pitch (standard 0.1 inch or 2.54mm pitch), and segment window dimensions. Tolerances are typically ±0.25mm.
• Pin Configuration and Polarity:This device employs a common anode configuration. This means the anodes of all segments and decimal points are internally connected and brought out to specific pins (4, 6, 12, 17). The cathodes of individual segments (A-G) and the left/right decimal point cathodes are brought out to other pins. To illuminate a segment, its corresponding cathode pin must be driven low (connected to ground or a current sink), while the common anode is kept high (connected to V_CC).
• Pin Connection Details:This 18-pin device does not utilize all pins. The active pins include: common anodes (pins 4, 6, 12, 17), segment cathodes A(2), B(15), C(13), D(11), E(5), F(3), G(14), left decimal point L.D.P(7), right decimal point R.D.P(10). Pins 1, 8, 9, 16, 18 are marked as "NO PIN" (not connected).

6. Soldering and Assembly Guide

Proper handling is crucial for maintaining reliability.

• Uuzaji wa reflow:Kwa uuzaji wa wimbi au reflow, joto la juu linalopendekezwa kwenye mwamba wa kuuza ni 260°C kwa muda usiozidi sekunde 3. Sehemu ya kipimo iko chini ya kifurushi kwa umbali wa 1.6mm (1/16 inchi) ili kuepuka kufunuliwa kwa chip ya LED kwa joto la juu kupita kiasi.
• Uuzaji wa mikono:如果必须进行手工焊接，应使用温控烙铁，烙铁头温度不超过350°C，并尽量减少接触时间（最好每引脚<3秒）。
• Usafishaji:Tumia tu vimumunyisho vya kusafisha vilivyoidhinishwa na vinavyolingana na nyenzo za lenzi za epoksi za LED. Kemikali zenye nguvu zinaweza kusababisha kung'aa au kuvunjika.
• Tahadhari za ESD:Ingawa haijasemwa wazi, LED ni kifaa cha semiconductor, kinaweza kuwa nyeti kwa utokaji umeme tuli (ESD). Inashauriwa kutumia utaratibu wa kawaida wa usindikaji ESD (kituo cha kazi kilichogunduliwa, mkanda wa mkono).
• Masharti ya uhifadhi:Katika safu ya halijoto iliyowekwa ya -35°C hadi +85°C, hifadhi katika mazingira yaliyokauka, yasiyo na umeme tuli, ili kuzuia unyevunyevu au uharibifu wa nyenzo.

7. Mapendekezo ya Matumizi

7.1 Mandhari ya Kawaida ya Matumizi

• Vyombo vya kupimia:Usomaji wa dijiti wa multimeter ya dijiti, vyanzo vya umeme, kipima masafa na oscilloscope.
• Udhibiti wa viwanda:Paneli ya kuonyesha joto, shinikizo, kasi au hesabu kwenye mashine.
• Elektroniki za Matumizi ya Kaya:Vifaa vya Sauti (kiwango cha sauti cha kivutio), Vifaa vya Jikoni (kitima muda, onyesho la joto) na redio ya saa.
• Mifumo Iliyopachikwa na Uundaji wa Mfano:Kama kifaa rahisi cha pato kwa vidhibiti vidogo (kama Arduino, Raspberry Pi) katika miradi ya elimu au wapenzi.

7.2 Kuzingatia Katika Ubunifu

• Udhibiti wa Mto wa Umeme:LEDs must be driven using a current-limiting resistor in series with the common anode or a constant-current driver IC. The resistor value is calculated using the formula R = (V_CC- V_F) / I_F. Using the maximum V_Fvalue (2.6V) ensures sufficient voltage under all conditions. For a 5V supply and a desired I_Fvalue of 10mA: R = (5V - 2.6V) / 0.01A = 240 Ω.
• Multiplexing:For multi-digit displays, multiplexing is commonly employed, where each digit is illuminated rapidly in sequence. The common anode structure of the LTS-3401LJG is well-suited for this technique. Its peak current rating (60mA) allows the use of higher pulsed currents to achieve the same average brightness as a lower DC current, thereby improving efficiency.
• Driving Circuit:The display is IC-compatible, meaning it can be driven directly by dedicated LED driver chips (e.g., a 74HC595 shift register with current-limiting resistors, or MAX7219/MAX7221 display drivers) or by microcontroller I/O pins (with adequate current sinking capability).
• Perspective:Wide viewing angle specifications mean the display remains readable when viewed from the side, which is an important factor in panel design.

8. Ulinganishi wa Kiufundi na Tofauti

Compared to other seven-segment display technologies:

• Compared to standard GaP or GaAsP LEDs:AlInGaP technology offers significantly higher luminous efficiency and brightness, especially within the red-orange-yellow-green spectral range. It provides better performance at lower currents.
• Compared to LCD displays:LED displays are self-illuminating (generating their own light), making them clearly visible in dark conditions without the need for a backlight. They have faster response times and a wider operating temperature range. However, they typically consume more power than reflective LCDs.
• Comparison with incandescent or VFD displays:LEDs are solid-state devices, offering higher reliability, resistance to shock/vibration, and a longer operational life (typically tens of thousands of hours). They operate at lower voltages and generate less heat.
• Key advantages of the LTS-3401LJG:The combination of AlInGaP material (high efficiency and brightness), binned luminous intensity (consistency), low operating current, and a standard DIP package makes it a rugged and easy-to-use choice for medium-to-high brightness green numeric display applications.

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

• Q: What is the purpose of the multiple common anode pins (4, 6, 12, 17)?
  A: They are internally connected. Providing multiple pins helps distribute the total anode current (which could be the sum of currents for up to 9 segments/decimal points), reduces the current density on a single pin, and offers flexibility for PCB layout.
• Swali: Naweza kutumia pini ya kidhibiti ndogo ya 3.3V kuendesha kiolezi hiki moja kwa moja?
  Jibu: Inawezekana, lakini kwa tahadhari. V_Fni 2.6V kwa 20mA. Kwa 3.3V, ukizingatia kushuka kwa voltage ya LED na kushuka kidogo kwenye kiendeshi, nafasi iliyobaki kwa upinzani wa kudhibiti mkondo ni ndogo sana. Hii inafanya mwangaza kuwa nyeti sana kwa mabadiliko ya V_Fna voltage ya usambazaji. Njia ya kuaminika zaidi ni kutumia IC ya kiendeshi inayoweza kutoa voltage ya juu zaidi, au kutumia transistor kubadili reli ya usambazaji ya voltage ya juu (mfano 5V).
• Swali: "Nguvu ya mwanga hupimwa kwa kutumia mchanganyiko wa sensor ya mwanga na kichujio kinachokaribia mkunjo wa majibu ya jicho la binadamu la CIE" inamaanisha nini?
  Jibu: Hii inamaanisha kuwa mwangaza (katika vitengo vya microcandela) hupimwa kwa kutumia kipimamwanga kilichowekwa sawa kulingana na usikivu wa wigo wa kawaida wa jicho la binadamu (photopic) kama ilivyofafanuliwa na Kamati ya Kimataifa ya Mwanga (CIE). Hii inahakikisha thamani zilizoripotiwa zinahusiana na mwangaza unaohisiwa, na sio tu nguvu ya mwanga ya awali.
• Swali: Kwa nini kiwango cha voltage ya kinyume ni 5V tu?
  Jibu: Kiunganishi cha PN cha LED hakikusudiwa kukabiliana na upendeleo wa kinyume wa juu. Kiwango cha 5V ni cha kawaida na kinatosha kwa matumizi mengi ambayo kuna uwezekano wa kuguswa kinyume kwa bahati mbaya au mishtuko ya voltage. Hakikisha kila wakati mzunguko wa kiendeshi unazuia upendeleo wa kinyume kuzidi kikomo hiki.

10. Utafiti wa Kesi za Usanifu na Matumizi

Scenario: Design a 4-digit voltmeter reading display.

A designer is building a compact digital voltmeter module. They require a bright, clear display readable under ambient light. They selected four LTS-3401LJG displays. To save microcontroller I/O pins, they implemented multiplexing. One microcontroller port drives the segment cathodes (A-G, DP) of all digits through current-limiting resistors. Four additional microcontroller pins, each connected to a transistor switch, control the common anode of each digit. The software rapidly cycles through each digit, turning on its transistor and outputting the corresponding segment pattern. During its brief on-time, the peak current per segment can be set higher (e.g., 25-30mA) to achieve good average brightness. The designer specified components from the same luminous intensity bin to ensure uniform brightness across all four digits. The gray panel/white segment design provides good contrast for the panel. The low forward voltage allows efficient operation from a single 5V supply rail, which also powers the microcontroller and display drivers.

11. Utangulizi wa Kanuni za Kiufundi

The LTS-3401LJG operates based on the principle of electroluminescence in a semiconductor PN junction. The active region employs an AlInGaP multiple quantum well structure grown on a GaAs substrate. When a forward bias voltage exceeding the junction's built-in potential (approximately 2.0-2.2V for AlInGaP) is applied, electrons and holes are injected into the active region. They undergo radiative recombination, releasing energy in the form of photons. The specific alloy composition of AlInGaP is engineered to have a direct bandgap corresponding to green light (wavelength ~571 nm). The opaque GaAs substrate absorbs any downward-emitted light, making the device inherently surface-emitting, which is suitable for the seven-segment top-view package. Each segment consists of one or more such LED chips connected in parallel, encapsulated within an epoxy lens that also acts as a diffuser to create a uniform segment appearance.

12. Mwelekeo wa Teknolojia

Ingawa LTS-3401LJG inawakilisha teknolojia iliyokomaa, uwanja mpana wa vipengele vya kuonyesha bado unaendelea kukua. Mienendo ya maendeleo inayoathiri uwanja huu inajumuisha:

• Uboreshaji wa ufanisi:Utafiti endelevu wa nyenzo za semiconductor, ukijumuisha uboreshaji wa AlInGaP na kuendeleza nyenzo zenye ufanisi zaidi (kama vile InGaN kwa wigo mpana zaidi), umewezesha vionyeshi kufikia mwangaza zaidi kwa mkondo wa chini zaidi.
• Udogo na Ujumuishaji:Mwelekeo ni kuelekea vionyeshi vilivyo na nafasi ndogo na msongamano mkubwa, pamoja na ujumuishaji wa moja kwa moja wa vifaa vya kuendesha elektroniki kwenye kifurushi cha kuonyesha (mfano, moduli za udhibiti wa I2C au SPI), na hivyo kupunguza idadi ya vipengele vya nje.
• Teknolojia Mbadala:Vionyeshi vya LED vya kikaboni (OLED) na vya LED vidogo vina uwezo wa kutoa suluhisho mbadala nyembamba, zinazobadilika, na zenye tofauti kubwa zaidi, lakini kwa vionyeshi rahisi vya nambari kama hivi, gharama na ukamilifu bado ni mambo ya kuzingatia.
• Kuzingatia Urahisi na Uaminifu:Kwa matumizi mengi ya viwanda na vilivyopachikwa, mwelekeo muhimu sio lazima uwe utendaji wa awali, bali ni kuboresha uaminifu katika anuwai pana ya halijoto, kuimarisha ulinzi dhidi ya utokaji umeme tuli (ESD), na kufikia ufungaji rahisi zaidi wa kusakinishwa kiotomatiki (mfano, ufungaji wa aina ya kusakinishwa kwenye uso kwenye mkanda). Faida kuu ya LTS-3401LJG—urahisi, uthabiti, na utendaji uliothibitishwa—inahakikisha kuwa inabaki muhimu katika matumizi ambapo sifa hizi ni muhimu sana.