LTS-367JD LED Digital Tube Datasheet - 0.36 Inch Character Height - Super Red - 2.6V Forward Voltage - 70mW Power Consumption - Simplified Chinese Technical Documentation

1. Product Overview

The LTS-367JD is a compact single-digit digital display device, specifically designed for applications requiring clear and bright numeric readouts. Its primary function is to visually display digits 0-9 and some letters through a seven-segment configuration, controlled via independent anodes for each segment. The device utilizes solid-state AlInGaP (Aluminum Indium Gallium Phosphide) LED technology, specifically in ultra-red color, offering high brightness and efficiency. The display features a gray panel with white segments, enhancing contrast and readability under various lighting conditions. The device is graded according to luminous intensity, ensuring consistent brightness levels across different production batches. This component is typically intended for embedded systems, instrument panels, industrial controls, consumer electronics, and any equipment requiring a simple and reliable numeric indicator.

2. Cikakken bayani na ƙayyadaddun fasaha

2.1 Halayen haske da na gani

Optical performance is the core of the display's functionality. The device utilizes an AlInGaP LED chip based on an opaque GaAs substrate. Key optical parameters measured at an ambient temperature (Ta) of 25°C are as follows:

• Average Luminous Intensity (I_V):At a forward current (I_F) of 1 mA, it ranges from a minimum of 200 µcd to a typical value of 650 µcd. This parameter defines the perceived brightness of the illuminated segment.
• Peak Emission Wavelength (λ_p):At I_F=20mA, the typical value is 650 nanometers (nm), with the output located in the deep red part of the visible spectrum.
• Dominant Wavelength (λ_d):The typical value is 639 nm. This is the single wavelength perceived by the human eye that most closely matches the color of the emitted light.
• Spectral line half-width (Δλ):The typical value is 20 nm. This indicates spectral purity; the narrower the width, the closer the output is to monochromatic (pure color).
• Luminous intensity matching ratio (I_V-m):At I_F=1mA, maximum is 2:1. This key specification ensures uniform brightness across display segments; the brightness of the dimmest segment is not less than half that of the brightest segment, preventing uneven brightness.

Luminous intensity measurement is performed using a combination of a sensor and filter approximating the CIE (International Commission on Illumination) photopic response curve, ensuring the measured value aligns with human visual perception.

2.2 Sigogin lantarki

Electrical characteristics define the operating limits and conditions for reliable integration into a circuit.

• Forward voltage per segment (V_F):Typical value is 2.1V, maximum is 2.6V when I_F=10mA. This is the voltage drop across the LED segment when conducting current.
• Reverse current per segment (I_R):Maximum is 100 µA when a 5V reverse voltage (V_R) is applied. This indicates the minimal leakage current when the LED is reverse biased.
• Continuous forward current per segment:The rated maximum is 25 mA. Exceeding this value may cause permanent damage due to overheating.
• Peak forward current per segment:A cikin yanayin bugun jini (1/10 aikin aiki, 0.1ms faɗin bugun) yana iya ɗaukar har zuwa 90 mA na ɗan gajeren lokaci, ya dace don aiwatar da tsarin haɗakar da yawa don ƙarin haske na fahimta.
• Kowane ɓangaren amfani da wutar lantarki:Matsakaicin 70 mW. Wannan shine samfurin ƙarfin lantarki da kuma halin yanzu, wanda ke wakiltar wutar lantarki da aka canza zuwa haske da zafi.

2.3 Halayen zafi da cikakken iyakan ƙididdiga

Waɗannan ƙididdiga sun tsara iyakokin muhalli da aiki waɗanda ba za a iya wucewa ba don tabbatar da tsawon rayuwar na'urar da hana lalacewa.

• Kewayon zafin aiki:-35°C zuwa +85°C. An ƙera wannan na'urar don yin aiki da kyau a cikin wannan faɗin kewayon zafin muhalli.
• Kewayon zafin ajiya:-35°C zuwa +85°C. Na'urar za ta iya ajiye lafiya a cikin wannan kewayon lokacin da ba a kunna wutar lantarki ba.
• Yanayin zafi na gauran karfe:Na'urar za ta iya jure yanayin zafi na gauran karfe na 260°C na tsawon dakika 3 a ƙasa da filin shigar da kayan aikin inci 1/16 (kimanin 1.6 mm). Wannan yana da mahimmanci ga aikin gauran karfe na guguwa ko na sake kumburi.
• Rage ƙimar ƙarfin lantarki:Matsakaicin ci gaba da ƙarfin lantarki na gaba dole ne a rage shi a layi daya daga ƙimar sa na 25 mA a 25°C. Ƙimar ragewa ita ce 0.33 mA/°C. Misali, a yanayin zafin muhalli na 85°C, matsakaicin ƙarfin lantarki na ci gaba da yarda shine: 25 mA - [0.33 mA/°C * (85°C - 25°C)] = 25 mA - 19.8 mA = 5.2 mA. Wannan muhimmin abu ne na ƙira a cikin yanayi mai zafi.

3. Tsarin matsayi da rarrabuwa

Takardar ƙayyadaddun bayanai ta bayyana cewa na'urar "ana matsayinta bisa ƙarfin haske". Wannan yana nuna tsarin matsayin samarwa. A lokacin samarwa, ana gwada LED da rarraba su (matsayi) bisa ƙarfin hasken da aka auna a daidaitaccen ƙarfin gwajin lantarki (watakila 1mA ko 10mA). Ana sanya sassan cikin takamaiman kewayon ƙarfi ko nau'i. Wannan yana tabbatar da cewa masu ƙira da masu siye suna samun nuni mai daidaito da haske mai iya hasashe. Ko da yake wannan ɓangaren bai yi cikakken bayani game da takamaiman lambobin matsayi ko nau'ikan ba, wannan aikin yana tabbatar da cewa mafi ƙarancin (200 µcd) da ƙimar al'ada (650 µcd) sun cika, kuma ayyukan sassan a cikin oda ɗaya zai kasance kusa da juna.

4. Performance Curve Analysis

The datasheet references "Typical Electrical/Optical Characteristic Curves." Although specific graphs are not provided in the text, standard curves for such LEDs typically include:

• Forward Current vs. Forward Voltage (I-V Curve):It shows an exponential relationship. A series current-limiting resistor is always required to set the operating point on this curve and prevent thermal runaway.
• Luminous Intensity vs. Forward Current (I_V vs. I_F):It shows how brightness increases with current, typically exhibiting an approximately linear relationship within the normal operating range, with efficiency dropping at very high currents.
• Luminous Intensity vs. Ambient Temperature:It shows how light output decreases as the LED junction temperature rises. This is related to the current derating requirement.
• Spectral Distribution:Taswirar dangantakar ƙarfi da tsawon raƙuman ruwa, wanda ke nuna kololuwa a ~650 nm da rabin faɗin 20 nm, yana tabbatar da launin ja mai tsananin ja.

Waɗannan lanƙwasai suna da mahimmanci ga ƙira mai zurfi, suna ba injiniyoyi damar inganta yanayin tuƙi don takamaiman manufofin haske, inganci, da rayuwa.

5. Mechanical and Package Information

5.1 Physical Dimensions and Drawings

Tsayin harafin na'urar an kwatanta shi da inci 0.36 (milimita 9.14). Sashen "Girman Kunshewa" zai ƙunshi cikakkun zane-zanen injiniya. Sai dai idan an faɗi daban, duk girmansu ana auna su da milimita (mm), tare da daidaitaccen ƙima na ±0.25 mm (0.01 inci). Wannan zane yana da mahimmanci ga shimfidar PCB (Allon Da'ira da aka Buga), yana tabbatar da ƙirar filaye da tsarin ramuka daidai. Yana ayyana jimillar tsayi, faɗi, da tsayi na kunshewa, tazarar ƙusa, da matsayin lambobi dangane da gefen kunshewa.

5.2 Pin Configuration and Polarity

LTS-367JD waniCommon cathodeDisplay. This means the cathodes (negative terminals) of all individual LED segments are internally connected together. The pin definitions are as follows:

• Pin 1: Common cathode (internally connected to Pin 6)
• Pin 2: Segment F anode
• Pin 3: Segment G anode
• Pin 4: Segment E anode
• Pin 5: Segment D anode
• Pin 6: Common Cathode (internally connected to Pin 1)
• Pin 7: Decimal Point (D.P.) Anode
• Pin 8: Segment C Anode
• Pin 9: Segment B Anode
• Pin 10: Segment A Anode

The internal connection between Pin 1 and Pin 6 provides mechanical redundancy for the common cathode connection, enhancing reliability. The "Rt. Hand Decimal" notation indicates that the decimal point is located on the right-hand side of the digit when viewing the display from the front.

5.3 Internal Circuit Diagram

The referenced diagram visually represents the electrical connections described in the pin definition. It shows the ten pins connected to one digit. Seven segments (A through G) and one decimal point (DP) are represented, each being an independent LED (anode and cathode). The cathodes of all eight LEDs are shown connected together, forming the common cathode node, and are brought out to two pins (1 and 6). Each anode connects to its respective pin. This diagram is crucial for understanding how to drive the display: the common cathode is typically connected to ground, while a high logic level or current source applied to an anode pin will illuminate that specific segment.

6. Soldering and Assembly Guide

The key assembly specification provided is the soldering temperature rating: the package can withstand 260°C for 3 seconds measured 1.6 mm (1/16 inch) below the seating plane. This is a standard rating for wave soldering. For reflow soldering, a time-controlled profile with a peak temperature not exceeding 260°C and time above liquidus (e.g., 217°C) should be used to prevent excessive thermal stress. Standard ESD (Electrostatic Discharge) precautions should be followed during handling, as the LEDs are sensitive to static electricity. The broad storage temperature range (-35°C to +85°C) provides flexibility for inventory management and shipping conditions.

7. Application Recommendations

7.1 Typical Application Circuit

The LTS-367JD is very suitable for applications requiring a single, highly readable digit. Common uses include:

• Kayan aikin ma'auni:Na'urorin ma'auni na panel, kayan aikin gwaji, ma'auni.
• Sarrafa masana'antu:Nuni na ƙididdiga, karatun ƙidayar lokaci, alamun saiti akan inji.
• Kayayyakin lantarki na mabukaci:Nuni na na'urar sauti, sarrafa kayan gida (misali microwave, thermostat).
• Ayyukan haɗe-haɗe da ƙirƙira samfuri:Display for hobbyists such as educational kits, Arduino, Raspberry Pi.

7.2 Tunani da Hanyoyin Turawa

Current Limiting:One resistor per segment anode (or a single resistor on the common cathode if multiplexed)MustConnect a resistor in series to limit the forward current to a safe value (e.g., 10-20 mA at full brightness). Calculate the resistor value using Ohm's Law: R = (V_{Power Supply}- V_F) / I_F. For a 5V power supply, the target I_Fis 10mA, V_F=2.1V, then R = (5 - 2.1) / 0.01 = 290 Ω. Standard 270 Ω or 330 Ω resistors are suitable.

Driving Electronics:If the microcontroller GPIO pin can source/sink sufficient current (check the MCU's specifications), it can drive these segments directly. For higher current or voltage differences, it is recommended to use a transistor driver (BJT or MOSFET) or a dedicated LED driver IC (such as the current-limiting 74HC595 shift register or the MAX7219 display driver). Using a driver IC simplifies control, especially when multiplexing multiple digits.

Multiplexing:Although this is a single-digit display, the same principle applies if using multiple similar digits. By rapidly switching which digit's common cathode is active and presenting that digit's segment data, many digits can be controlled with fewer I/O pins. The peak current rating (90mA at 1/10 duty cycle) allows for higher instantaneous current during the brief on-time to achieve good average brightness.

Viewing Angle:The datasheet emphasizes "wide viewing angle," which is highly beneficial for applications where the display might be viewed from off-axis positions.

8. Kwatancen Fasaha da Bambance-bambance

The key differentiation of the LTS-367JD lies in its use ofAlInGaP (Super Red)technology and its specific form factor. Compared to older GaAsP or GaP red LEDs, AlInGaP offers significantly higher luminous efficiency, resulting in higher brightness at the same input current. The "gray panel with white segments" enhances contrast compared to all-red or all-green packages. The 0.36-inch character height is a standard size, providing a good balance between readability and board space. Its common cathode configuration is typical and easy to interface with most microcontroller circuits, which find it easier to sink current than to source it. The luminous intensity grading is a mark of quality control, ensuring performance consistency.

9. Tambayoyin da ake yawan yi (FAQ)

Q1: Why are there two common cathode pins (1 and 6)?
A1: This provides mechanical and electrical redundancy. It allows for a more robust connection to ground on the PCB (using two pads/vias), improving reliability. Electrically, they are the same node.

Q2: Can I drive this display directly with a 3.3V microcontroller?
A2: Yana yiwu, amma dole ne ku duba ƙarfin lantarki mai kyau (V_F). Yawanci V_Fshine 2.1V, yana da ɗan sauri na 1.2V (3.3V - 2.1V). Har yanzu ana buƙatar resistor mai iyakancewar kwarara. Lissafin R = (3.3 - 2.1) / I_F. Don 10mA, R = 120 Ω. Tabbatar cewa fil ɗin microcontroller zai iya samar da kusan 10mA na kwarara.

Q3: Me ake nufi da "Super Red" idan aka kwatanta da ja na yau da kullun?
A3: Idan aka kwatanta da ja na yau da kullun (620-630 nm), Super Red LED yana da mafi tsayin babban / kololuwar tsawon zango (yawanci 640-660 nm). Suna nuna ja mai zurfi, "tsantsa", kuma yawanci suna da mafi girman ingancin haske.

Q4: Ta yaya ake lissafin jimlar amfani da wutar lantarki na nuni?
A4: Idan duk sassan 7 da ma'auni na goma suna ci gaba da haskakawa, misali, kowanne yana da kwarara na 10mA a V_F=2.1V, to jimlar kwarara ita ce 80mA. Ƙarfi = V_F* Jimlar I_F= 2.1V * 0.08A = 0.168W or 168 mW. This is below the per-segment power limit, but power supply and heat dissipation must be considered.

Q5: Why is current derating necessary?
A5: As junction temperature increases, LED efficiency decreases and the risk of catastrophic failure rises. At higher ambient temperatures, the same electrical power input results in a higher junction temperature. Reducing the current lowers the electrical power input (and thus the heat generated), keeping the junction temperature within a safe range.

10. Misalin Ƙira da Amfani na Ainihi

Scenario: Building a simple counter display using Arduino.
Objective: Display a count from 0 to 9, incrementing once per second.

Components:Arduino Uno, LTS-367JD display, eight 330Ω resistors (one each for segments A-G and DP).

Wiring:
1. Connect the common cathode pins (1 and 6) of the display to Arduino GND.
2. Connect each segment anode (pins 2,3,4,5,7,8,9,10) to an individual digital pin on Arduino (e.g., 2 to 9) through a 330Ω current-limiting resistor.

Software Logic:
The code will define an array that maps digits (0-9) to the combination of segments that need to be illuminated (e.g., '0' = segments A,B,C,D,E,F). In the loop, it will:
1. Determine the digit to be displayed.
2. Look up the segment pattern corresponding to that digit.
3. Based on the pattern, set the corresponding Arduino pins to HIGH (to light the segment) or LOW (to turn it off).
4. Wait for one second, then increment the digit and repeat.

Design Notes:Idan duk sassa suna haskakawa, jimlar halin yanzu daga Arduino 5V pins shine kusan 8 * (5V-2.1V)/330Ω ≈ 8 * 8.8mA = 70.4mA. Wannan yana cikin iyawar Arduino mai sarrafa wutar lantarki don nuni guda ɗaya, amma ya kamata a yi la'akari da shi idan ana samar da wutar lantarki ga wasu sassa.

11. Introduction to Technical Principles

LTS-367JD ya dogara ne akan girma a kanGaAs (Gallium Arsenide) marar ganuwasubstrateAlInGaP (Aluminum Indium Gallium Phosphide)kayan semiconductor. Lokacin da ake amfani da ƙarfin lantarki mai girma fiye da ƙarfin tazarar band na kayan a kan mahaɗin p-n, electrons da ramuka suna haɗuwa, suna sakin makamashi a cikin nau'in photon (haske). Takamaiman abun da ke cikin gawa na AlInGaP yana ƙayyade ƙarfin tazarar band, wanda kai tsaye ke ƙayyade tsawon zango (launi) na hasken da ake fitarwa - a cikin wannan misali, ja mai tsananin gaske (~639-650 nm). Substrate marar ganuwa yana taimakawa wajen karkatar da ƙarin hasken da aka samar zuwa saman na'urar, yana haɓaka ingancin adadin waje idan aka kwatanta da wasu tsofaffin ƙira masu ɗaukar substrate. Ana samar da sassa ɗaya ta hanyar yin alama akan yadudduka na semiconductor da lambobin karfe. Filin tace launin toka yana ɗaukar hasken muhalli, yana haɓaka bambanci, yayin da alamomin sassa masu fari ke yada hasken tushen batu na LED don samar da kamanni mai haske daidai gwargwado.

12. Technology Trends and Background

Ko da yake nunin LED guda bakwai mai lamba ɗaya kamar LTS-367JD suna wakiltar fasaha mai cikakken ci gaba, har yanzu suna da alaƙa sosai saboda sauƙinsu, amincinsu, ƙarancin farashi, da kyakkyawan karantawa, musamman a cikin yanayin haske mai yawa ko kallon fadi. Fasahar kayan AlInGaP ta tushe tana wakiltar babban ci gaba idan aka kwatanta da tsofaffin kayan LED ja kamar GaAsP, tana ba da inganci da haske mafi girma. Trends na fasahar nuni na yanzu suna mai da hankali kan haɗakar da yawa (modules na lambobi da yawa, nunin matrix) da hanyoyin haɗin kai (I2C, SPI drivers). Duk da haka, ɓangarorin lamba ɗaya masu rarrabuwa sun dace da aikace-aikacen da ke buƙatar lamba ɗaya ko 'yan lambobi kawai, suna rage sarkakiya da farashi zuwa mafi ƙanƙanta. Har ila yau akwai wani yanayi zuwa mafi inganci, yana ba da damar nunin a tuƙa a ƙarancin halin yanzu, don rage amfani da wutar lantarki da zafi, wanda ya dace da ƙa'idodin rage daraja da aka zayyana a cikin wannan takaddar ƙayyadaddun bayanai. Ka'idodin asali na iyakance halin yanzu, sarrafa zafi, da da'irori na tuƙi da aka yi cikakken bayani a nan suna da mahimmanci, kusan sun shafi duk ƙirar nuni na tushen LED.