Takardar Bayanin Fasaha na Nunin Lambobi Bakwai na 7.62mm Mai Launin Ja-Orange - Girman 19.0x13.2x8.0mm - Ƙarfin Gaba 2.0V - Wutar Lantarki 60mW

1. Bayyani Game da Samfur

Wannan takarda ta bayyana cikakken bayanin fasaha don nunin lambobi bakwai mai tsayin lamba 7.62mm (0.3-inch). An ƙera na'urar don saka ta cikin rami (THT) kuma tana amfani da fasahar guntu AlGaInP don fitar da haske mai launin ja-orange. Tana da sassa masu fitar da farin haske a kan farfajiyar launin toka, wanda ke haɓaka bambanci da karantawa, musamman a cikin yanayin haske mai haske. An rarraba samfurin don ƙarfin haske kuma ya bi ka'idojin muhalli na Pb-free da RoHS, wanda ya sa ya dace da nau'ikan aikace-aikacen lantarki da yawa waɗanda ke buƙatar karatun lambobi ko ƙayyadaddun haruffa masu dogaro.

1.1 Fa'idodi na Asali da Kasuwar Da Ake Nufa

Babban fa'idodin wannan nunin sun haɗa da bin daidaitaccen tsarin ƙafa na masana'antu, yana tabbatar da dacewa da tsararrun PCB da soket ɗin da aka ƙera don wannan girman gama gari. Ƙarancin amfani da wutar lantarki shine babban fa'ida ga na'urori masu amfani da baturi ko masu ingancin makamashi. Resin ɗin farfajiyar launin toka yana haɓaka bambanci sosai ta hanyar rage hasken muhalli da aka nuna, yana sa sassan da aka haskaka su fito fili. An fi nufin na'urar ga aikace-aikacen da ke buƙatar nunin lambobi masu ƙarfi, masu karantawa, da tsada, kamar kayan amfani na gida, allunan kayan aikin masana'antu, da tsarin karatun lambobi daban-daban.

2. Zurfin Bincike na Sigogi na Fasaha

Sassan masu zuwa suna ba da cikakken bincike na haƙiƙa game da ƙayyadaddun lantarki, na gani, da na zafi na na'urar kamar yadda aka ayyana a cikin takardar bayanin.

2.1 Matsakaicin Matsakaicin Ƙimar

Waɗannan ƙimar suna ayyana iyakokin damuwa waɗanda sama da su lalacewa na dindindin na iya faruwa ga na'urar. Ba a ba da garantin aiki a ƙarƙashin ko a waɗannan iyakokin ba kuma ya kamata a guji su a cikin ƙira mai dogaro.

• Ƙarfin Lantarki na Baya (V_R):5V. Wuce gona da iri wannan ƙarfin lantarki a cikin karkatar da baya na iya haifar da rushewar haɗin gwiwa.
• Ci gaba da Ci gaba da Gaba (I_F):25mA. Wannan shine matsakaicin halin yanzu na DC da aka ba da shawarar don ci gaba da aiki.
• Kololuwar Ci gaba da Gaba (I_FP):60mA. Ana yarda da wannan kawai a ƙarƙashin yanayin bugun jini (duty cycle ≤ 10%, mitar ≤ 1kHz) kuma ba dole ba ne a yi amfani da shi don karkatar da DC.
• Rushewar Wutar Lantarki (P_d):60mW. Wannan shine matsakaicin wutar lantarki da fakiti zai iya watsawa a yanayin zafin muhalli (T_a) na 25°C. Dole ne a duba lanƙwan rage wutar lantarki don yanayin zafi mafi girma.
• Yanayin Aiki (T_opr):-40°C zuwa +85°C. An ba da garantin cewa na'urar za ta yi aiki a cikin wannan kewayon yanayin zafi.
• Yanayin Ajiya (T_stg):-40°C zuwa +100°C.
• Yanayin Solder (T_sol):260°C na matsakaicin tsawon lokaci na dakika 5, wanda ya zama ruwan dare don hanyoyin solder na igiyar ruwa ko hannu.

2.2 Halayen Lantarki-Gani

Ana auna waɗannan sigogi a daidaitaccen yanayin zafi na muhalli na 25°C kuma suna ayyana aikin na'urar a ƙarƙashin yanayin aiki na yau da kullun.

• Ƙarfin Hasken (I_v):Matsakaicin ƙimar shine 17.6 mcd a kowane sashe lokacin da aka motsa shi a halin yanzu na gaba (I_F) na 10mA. Matsakaicin ƙimar da aka ƙayyade shine 7.8 mcd. Rashin daidaituwa na ±10% ya shafi ƙarfin haske. Masu ƙira yakamata su yi amfani da mafi ƙarancin ƙima don lissafin haske mafi munin yanayi.
• Matsakaicin Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon 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Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Ts�awon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Tsawon Ts_p): nm (typical). This is the wavelength at which the spectral emission is strongest.
• Dominant Wavelength (λ_d): nm (typical). This wavelength describes the perceived color of the light and is more relevant for human vision than the peak wavelength.
• Spectrum Radiation Bandwidth (Δλ): nm (typical). This indicates the spectral purity; a smaller bandwidth means a more monochromatic color.
• Forward Voltage (V_F):.0V typical, 2.4V maximum at I_F=20mA. The tolerance is ±0.1V. This parameter is crucial for designing the current-limiting circuitry.
• Reverse Current (I_R):Maximum 100 µA at V_R=5V. This is the leakage current when the device is reverse-biased.

. Binning System Explanation

The datasheet indicates that the devices are \"Categorized for luminous intensity.\" This implies a binning or sorting process post-manufacturing.

• Luminous Intensity Binning:The primary binning criterion is luminous intensity (I_v). Devices are tested and grouped into specific intensity ranges or \"CAT\" codes (as referenced in the packing label). This ensures consistency in brightness within a single production batch or order. Designers specifying this part should be aware that brightness may vary between different CAT codes.
• Color/Wavelength:While not explicitly mentioned as a binned parameter, the typical values for peak (621nm) and dominant wavelength (615nm) are provided. For most applications using AlGaInP for reddish-orange, the color variation is typically tight, but critical color-matching applications should verify with the supplier.
• Forward Voltage:The specified tolerance is ±0.1V, which is relatively tight. While not necessarily a formal bin, this tight tolerance simplifies driver design by reducing the variation in voltage drop across the display.

. Performance Curve Analysis

The datasheet provides typical characteristic curves which are essential for understanding device behavior under non-standard conditions.

.1 Spectrum Distribution

The spectral output curve shows a characteristic emission peak around 621 nm, confirming the reddish-orange color. The 18nm bandwidth indicates a reasonably saturated color. The curve shape is typical for AlGaInP materials.

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

This curve illustrates the non-linear relationship between current and voltage. It shows that for a given forward current (e.g., 20mA), the forward voltage will typically be around 2.0V. The curve's slope represents the dynamic resistance of the LED junction. Designers use this to calculate the necessary supply voltage and series resistor value for proper current regulation.

.3 Forward Current Derating Curve

This is one of the most critical graphs for reliable design. It shows how the maximum permissible continuous forward current must be reduced as the ambient temperature increases above 25°C. At the maximum operating temperature of 85°C, the allowable continuous current is significantly lower than the 25mA absolute maximum rating at 25°C. Ignoring this derating can lead to accelerated lumen depreciation, color shift, and catastrophic failure due to overheating.

. Mechanical and Package Information

.1 Package Dimensions

The display has a standard DIP (Dual In-line Package) footprint. Key dimensions from the drawing include:

• Overall Height: 8.0 mm (max)
• Body Width: 13.2 mm (nominal)
• Body Length: 19.0 mm (nominal)
• Digit Height: 7.62 mm (0.3 inches)
• Lead (Pin) Spacing: 2.54 mm (0.1 inch) standard grid.
• Lead Diameter: 0.5 mm (typical)

Tolerances are ±0.25mm unless otherwise specified. These dimensions are vital for PCB layout, ensuring proper fit in the mounting hole and correct spacing for wave soldering.

.2 Pinout and Polarity Identification

The internal circuit diagram shows a common-cathode configuration for the seven segments. This means all segment LEDs share a common negative connection (cathode). The individual anodes for segments a through g are on separate pins. The common cathode pin must be connected to ground (or the lower voltage potential) in the circuit. The pinout diagram must be consulted during PCB design to correctly route signals to each segment. Misconnection will result in segments not illuminating or incorrect numbers/characters being displayed.

. Soldering and Assembly Guidelines

• Soldering:The absolute maximum soldering temperature is 260°C for up to 5 seconds. This is suitable for hand soldering with an iron or wave soldering processes. Care should be taken to avoid prolonged heat exposure to prevent damage to the plastic package and internal wire bonds.
• ESD (Electrostatic Discharge) Precautions:The LED dice are sensitive to ESD. Recommended handling precautions include using grounded wrist straps, ESD-safe workstations with conductive mats, and proper grounding of all equipment. Insulating materials should be treated with ionizers or kept at a controlled humidity to dissipate charge.
• Cleaning:While not specified, standard PCB cleaning processes compatible with epoxy resin packages can be used. Consult the manufacturer for specific chemical compatibility.
• Storage:Devices should be stored within the specified storage temperature range (-40°C to +100°C) in a low-humidity, ESD-safe environment.

. Packaging and Ordering Information

• Packaging Format:The devices are packed in tubes, then boxes, and finally cartons. The specific packing is 26 pieces per tube, 88 tubes per box, and 4 boxes per carton, totaling 9,152 pieces per carton.
• Label Information:The packing label includes critical information for traceability and identification:
  • CPN: Customer's Part Number
  • P/N: Manufacturer's Part Number (e.g., ELS-321USOWA/S530-A4)
  • QTY: Quantity in the package
  • CAT: Luminous Intensity Rank (the bin code)
  • LOT No.: Manufacturing lot number for traceability.

. Application Suggestions

.1 Typical Application Circuits

Being a common-cathode display, it is typically driven by a microcontroller or dedicated display driver IC (e.g., 74HC595 shift register, MAX7219). Each segment anode is connected to the driver output through a current-limiting resistor. The value of this resistor (R_series) is calculated using Ohm's Law: R_series= (V_supply- V_F) / I_F. Using the maximum V_F(2.4V) for a robust design, and a desired I_Fof 10mA with a 5V supply: R = (5V - 2.4V) / 0.01A = 260 Ω. A standard 270 Ω resistor would be appropriate. The common cathode pin(s) are switched to ground by the controller to enable the digit.

.2 Design Considerations

• Current Limiting:Always use a series resistor or constant current driver. Connecting directly to a voltage source will destroy the LED due to excessive current.
• Multiplexing:For multi-digit displays, multiplexing is common to save I/O pins. Ensure the peak current in multiplexed designs does not exceed the I_FPrating (60mA) and that the average current over time respects the I_Fderating for the duty cycle used.
• Viewing Angle:The gray background improves contrast but may slightly affect the viewing angle compared to a black background. Consider the intended viewing position of the end product.
• Heat Management:In high ambient temperature environments or when driving near maximum current, ensure adequate ventilation around the display to prevent the junction temperature from exceeding safe limits.

. Technical Comparison and Differentiation

Compared to older technologies or smaller displays, this device offers specific advantages:

• vs. Incandescent or VFD Displays:Much lower power consumption, longer lifetime, higher shock/vibration resistance, and cooler operation.
• vs. Smaller LED Displays (e.g., 5mm or 3mm digit):The 7.62mm digit height offers superior readability at a distance, making it suitable for panel meters and appliances where the user may not be up close.
• vs. LCD Displays:LEDs are self-illuminating, providing excellent visibility in low-light conditions without a backlight. They also have a much wider operating temperature range and faster response time.
• Key Differentiator:The combination of the industrial-standard 7.62mm size, the contrast-enhancing gray surface, and the reliable AlGaInP technology for reddish-orange emission positions this display as a robust, legible, and energy-efficient choice for industrial and consumer numeric readouts.

. Frequently Asked Questions (Based on Technical Parameters)

.1 Can I drive this display with 20mA continuously?

Yes, but with caution. The absolute maximum continuous current is 25mA at 25°C ambient. Driving at 20mA is within spec, but youmustconsult the forward current derating curve if the ambient temperature is expected to rise. At 85°C, the maximum allowed continuous current is significantly lower. For reliable long-term operation, driving at 10-15mA is often a safer practice that also extends operational life.

.2 Why is the typical forward voltage (2.0V) lower than for some white or blue LEDs?

The forward voltage is primarily determined by the semiconductor material's bandgap energy. AlGaInP, used for reddish-orange/red/amber colors, has a lower bandgap energy than the InGaN materials used for blue, green, and white LEDs. A lower bandgap requires less energy (lower voltage) for electrons to cross and emit photons.

.3 What does \"categorized for luminous intensity\" mean for my design?

It means displays from different production batches or labeled with different \"CAT\" codes may have different brightness levels. If uniform brightness across all units in your product is critical, you should specify and procure devices from a single intensity bin (CAT code). For most applications, the variation within the specified tolerance (±10%) is acceptable.

. Practical Design Case Study

Scenario:Designing a simple 3-digit voltmeter for a benchtop power supply, operating in an environment up to 50°C.

Design Steps:

1. Drive Current Selection:Target 10mA per segment for good brightness and longevity.
2. Current Limiting Resistor:Using a 5V microcontroller supply and the max V_Fof 2.4V: R = (5V - 2.4V) / 0.01A = 260Ω. Use 270Ω (nearest standard value).
3. Multiplexing:To control 3 digits (21 segments + 3 common cathodes) with fewer pins, use multiplexing with a 1/3 duty cycle. The peak current per segment during its active time slot would be 30mA to maintain an average of 10mA (since it's only on 1/3 of the time). This 30mA peak is well below the 60mA I_FP rating.
4. Thermal Check:At 50°C ambient, the derating curve must be checked. The permissible continuous current is lower than 25mA. However, since ouraveragecurrent per segment is only 10mA, and the display is multiplexed (each digit is off 2/3 of the time), the junction temperature rise will be minimal, making this design thermally safe.
5. Microcontroller Interface:Use a shift register like the 74HC595 to control the segment anodes, and three GPIO pins to sink the common cathodes via transistors (e.g., 2N3904 NPN transistors).

. Operating Principle Introduction

A seven-segment LED display is an assembly of seven individual light-emitting diodes (LEDs) arranged in a figure-eight pattern. Each LED forms one segment (labeled a through g). By selectively illuminating specific combinations of these segments, all decimal numerals (0-9) and some letters can be formed. In this common-cathode device, the cathodes (negative terminals) of all seven segment LEDs are connected internally to one or more common pins. To light a segment, a positive voltage must be applied to its individual anode pin (through a current-limiting resistor), while the common cathode pin is connected to ground, completing the circuit. The light emission itself is due to electroluminescence in the AlGaInP semiconductor chip: when forward-biased, electrons and holes recombine at the p-n junction, releasing energy in the form of photons with a wavelength corresponding to the material's bandgap (around 615-621 nm for reddish-orange).

. Technology Trends and Context

Through-hole seven-segment displays like this one represent a mature and highly reliable technology. While surface-mount device (SMD) displays are increasingly common for automated assembly and miniaturization, through-hole displays remain popular for prototyping, educational use, repair markets, and applications where mechanical robustness and ease of hand-soldering are prioritized. The use of AlGaInP is standard for high-efficiency red, orange, and amber LEDs. Trends in the broader display market include the integration of controllers/drivers into the display module, the development of ultra-high-brightness versions for sunlight readability, and a shift towards SMD packages. However, the fundamental design and electrical interface of the standard seven-segment display have remained stable for decades, ensuring long-term availability and design familiarity.