Bayanin Fasaha na LED LTST-108KGKT SMD - 3.2x2.8x1.9mm - 2.4V Matsakaici - 72mW - AlInGaP Kore Mai Tsabta - Takardun Fasaha na Hausa

1. Bayanin Samfur

Wannan takarda tana ba da cikakken bayanin fasaha na LTST-108KGKT, na'urar haske (LED) mai hawa a saman (SMD). Wannan kayan yana cikin dangin LED da aka tsara don haɗa allon da'ira (PCB) ta atomatik da aikace-aikacen da sarari ya zama matsala. Girman sa na ƙanƙanta da kuma daidaitaccen kunshin sun sa ya dace da haɗawa cikin kayan lantarki na zamani.

1.1 Fa'idodi na Asali da Kasuwar Da Ake Nufi

Babban fa'idodin wannan LED sun haɗa da bin ka'idojin RoHS (Ƙuntata Abubuwa Masu Illa), kunshin a cikin tef na 8mm akan reels na inci 7 don injunan ɗauka da sanyawa ta atomatik, da dacewa da hanyoyin gyarawa na infrared (IR) reflow. An tsara shi don ya dace da I.C. (Da'irar Haɗaka). Waɗannan fasalulluka sun sa ya zama zaɓi mai kyau don samarwa mai yawa. Aikace-aikacen da ake nufi sun haɗa da sadarwa, sarrafa ofis, kayan aikin gida, da kayan aikin masana'antu. Ana amfani da shi a matsayin mai nuna matsayi, don fitilun sigina da alamomi, da kuma hasken baya na panel na gaba.

2. Ma'auni na Fasaha: Cikakken Bayani na Haƙiƙa

Wannan sashe yana cikakken bayyana iyakoki da halayen aiki na LED a ƙarƙashin daidaitattun yanayin gwaji (Ta=25°C). Fahimtar waɗannan ma'auni yana da mahimmanci don ƙirar da'irar da za a iya dogaro da ita.

2.1 Matsakaicin Matsakaicin Matsakaici

Ba za a iya aiki da na'urar fiye da waɗannan iyakokin ba, saboda yin hakan na iya haifar da lalacewa ta dindindin. Matsakaicin ci gaba na DC na gaba (IF) shine 30 mA. Matsakaicin watsawar wutar shine 72 mW. Matsakaicin igiyar gaba na 80 mA yana yiwuwa ne kawai a ƙarƙashin yanayin bugun jini (1/10 aikin aiki, faɗin bugun 0.1ms). Kewayon zafin aiki daga -40°C zuwa +85°C, kewayon zafin ajiya yana daga -40°C zuwa +100°C.

2.2 Halayen Lantarki da Hasken Gani

Waɗannan ma'auni suna ayyana aikin na'urar a ƙarƙashin yanayin aiki na yau da kullun (IF=20mA, Ta=25°C). Ƙarfin haske (Iv) yana da ƙima ta yau da kullun, tare da mafi ƙarancin 71 mcd da matsakaicin 224 mcd dangane da matsayin kwandon. Kusurwar kallo (2θ1/2) shine digiri 110, yana nuna tsarin haske mai faɗi. Tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon tsawon 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 tsaw

. Bin Ranking System Explanation

To ensure consistency in production, LEDs are sorted into bins based on key parameters. This allows designers to select parts that meet specific requirements for color and brightness uniformity.

.1 Forward Voltage (VF) Rank

LEDs are categorized into three voltage bins: D2 (1.8V - 2.0V), D3 (2.0V - 2.2V), and D4 (2.2V - 2.4V). The tolerance on each bin is ±0.10V. Selecting from the same bin helps maintain consistent voltage drops across multiple LEDs in a series circuit.

.2 Luminous Intensity (IV) Rank

The brightness is sorted into five bins: Q1 (71.0-90.0 mcd), Q2 (90.0-112.0 mcd), R1 (112.0-140.0 mcd), R2 (140.0-180.0 mcd), and S1 (180.0-224.0 mcd). The tolerance on each intensity bin is ±11%. This ranking is critical for applications requiring uniform brightness across an array of indicators.

.3 Dominant Wavelength (WD) Rank

The color (wavelength) is sorted into four bins: B (564.5-567.5 nm), C (567.5-570.5 nm), D (570.5-573.5 nm), and E (573.5-576.5 nm). The tolerance for each wavelength bin is ±1 nm. This precise sorting ensures minimal color variation in applications where specific hue matching is important.

. Performance Curve Analysis

Graphical representations of device characteristics provide deeper insight into performance under varying conditions, which is essential for robust design.

.1 Typical Characteristics Curves

The datasheet includes typical curves showing the relationship between forward current and luminous intensity, forward voltage versus forward current, and the spectral distribution of the emitted light. These curves help designers predict behavior outside the standard test point (20mA). For instance, the luminous intensity typically increases with current but may saturate at higher levels. The forward voltage has a positive temperature coefficient, meaning it decreases slightly as the junction temperature rises.

. Mechanical and Package Information

.1 Package Dimensions

The LED is housed in a standard SMD package. Key dimensions include a body size of approximately 3.2mm x 2.8mm, with a height of 1.9mm. All dimensions have a tolerance of ±0.2mm unless otherwise noted. The lens color is water clear, and the light source color is AlInGaP green.

.2 Recommended PCB Attachment Pad Layout

A diagram is provided showing the recommended copper pad pattern on the PCB for infrared or vapor phase reflow soldering. Adhering to this layout ensures proper solder joint formation, good thermal management, and mechanical stability.

.3 Polarity Identification

The cathode is typically indicated by a marking on the package or a notch in the body. Correct polarity orientation is essential for the device to function.

. Soldering and Assembly Guidelines

Proper handling and soldering are critical to maintaining device reliability and performance.

.1 IR Reflow Soldering Profile

A suggested reflow profile for lead-free processes is provided, compliant with J-STD-020B. Key parameters include a pre-heat temperature of 150-200°C for up to 120 seconds maximum, a peak temperature not exceeding 260°C, and a time above liquidus (TAL) of 10 seconds maximum. The profile should be characterized for the specific PCB assembly.

.2 Storage Conditions

Unopened packages should be stored at ≤30°C and ≤70% Relative Humidity (RH) and used within one year. Once the moisture-proof bag is opened, the LEDs should be stored at ≤30°C and ≤60% RH. It is recommended to complete the IR reflow process within 168 hours (7 days) of exposure to ambient air. For longer storage outside the original bag, use a sealed container with desiccant. If exposed for more than 168 hours, a bake at 60°C for at least 48 hours is required before soldering.

.3 Cleaning

If cleaning is necessary after soldering, only use specified solvents such as ethyl alcohol or isopropyl alcohol at normal temperature for less than one minute. Unspecified chemicals may damage the package.

. Packaging and Ordering Information

.1 Tape and Reel Specifications

The LEDs are supplied on 8mm wide embossed carrier tape wound onto 7-inch (178mm) diameter reels. Each reel contains 4000 pieces. The tape pockets are sealed with a top cover tape. Packaging follows ANSI/EIA 481 specifications.

.2 Minimum Order Quantity

The standard packing quantity is 4000 pieces per reel. A minimum packing quantity of 500 pieces is available for remainder stock.

. Application Suggestions

.1 Typical Application Scenarios

This LED is well-suited for status indication in consumer electronics (phones, laptops, appliances), network equipment, and indoor signage. Its wide viewing angle makes it effective for front panel illumination where visibility from multiple angles is needed.

.2 Design Considerations

Current Limiting:Always use a series current-limiting resistor or a constant-current driver. The value can be calculated using Ohm's Law: R = (Vsupply - VF) / IF. Ensure the resistor power rating is adequate.
Thermal Management:While the power dissipation is low, ensure adequate PCB copper area or thermal vias if operating at high ambient temperatures or near the maximum current to prevent excessive junction temperature rise.
ESD Protection:Although not explicitly stated as sensitive, standard ESD (Electrostatic Discharge) handling precautions should be observed during assembly.

. Technical Comparison and Differentiation

Compared to older technology like GaP (Gallium Phosphide) green LEDs, the AlInGaP (Aluminum Indium Gallium Phosphide) material system used in this device typically offers higher luminous efficiency and better color purity (more saturated green). The wide 110-degree viewing angle is a key differentiator from narrower-beam LEDs used for focused illumination, making it ideal for indicator purposes. The compatibility with standard IR reflow processes differentiates it from LEDs that require manual or wave soldering.

. Frequently Asked Questions (Based on Technical Parameters)

Q: What resistor should I use with a 5V supply?
A: Using the maximum VF of 2.4V and a desired IF of 20mA: R = (5V - 2.4V) / 0.02A = 130 Ohms. A standard 130Ω or 150Ω resistor would be suitable. Always calculate based on the actual VF bin if known.
Q: Can I drive this LED with a 3.3V microcontroller pin?
A: Possibly, but it depends on the VF bin. For a D4 bin LED (VF up to 2.4V), there is sufficient headroom (3.3V - 2.4V = 0.9V). A current-limiting resistor is still mandatory. For a microcontroller pin, ensure the pin can source/sink the required 20mA.
Q: Why is there a reverse current specification if the device is not for reverse operation?
A: The IR test (VR=5V) is a quality and reliability test performed during manufacturing. It verifies the integrity of the LED chip's PN junction. In application, reverse voltage should be avoided as it is not a designed operating condition.

. Practical Design and Usage Case

Scenario: Designing a multi-LED status bar for a router.Ten LTST-108KGKT LEDs are used to indicate network activity levels. To ensure uniform brightness, LEDs from the same IV bin (e.g., R2) should be selected. They can be connected in parallel, each with its own current-limiting resistor (e.g., 150Ω for a 5V rail). Alternatively, for better current matching, a single constant-current driver IC with multiple channels could be used. The wide 110° viewing angle ensures the lights are visible from across a room. The design must follow the recommended reflow profile and ensure the PCB layout uses the suggested pad geometry for reliable soldering.

. Operating Principle Introduction

An LED is a semiconductor diode. When a forward voltage is applied across its terminals (anode positive relative to cathode), electrons and holes are injected into the active region of the device. When these charge carriers recombine, energy is released in the form of photons (light). The color of the light is determined by the bandgap energy of the semiconductor material. In this case, the AlInGaP material system has a bandgap that corresponds to green light with a dominant wavelength in the 565-577 nm range. The water-clear lens helps in extracting and shaping the emitted light.

. Technology Trends (Objective Perspective)

The general trend in indicator LEDs is toward higher efficiency (more light output per unit of electrical power), smaller package sizes for denser integration, and improved color consistency through tighter binning. There is also a move toward broader adoption of lead-free and halogen-free materials to meet environmental regulations. While this specific part uses AlInGaP technology, other green LEDs may use InGaN (Indium Gallium Nitride) materials, which can offer different performance characteristics. The choice of technology involves trade-offs between efficiency, color point, cost, and viewing angle.