LTP-3362JS 0.3-inch Dual-Digit Alphanumeric LED Display Datasheet - Digit Height 7.62mm - Yellow Color - English Technical Document

1. Product Overview

LTP-3362JS is a dual-digit, 17-segment alphanumeric LED display module designed for applications requiring clear character and symbol presentation. Its primary function is to provide a highly legible visual output for numeric digits, alphabetic characters, and specific symbols. The core advantage of this device lies in its use of advanced AS-AlInGaP (Aluminum Indium Gallium Phosphide) Yellow LED chips, which are epitaxially grown on a GaAs substrate. This technology delivers high brightness and excellent color purity. The display features a black face with white segments, creating a high-contrast appearance that enhances readability under various lighting conditions. Its 0.3-inch (7.62 mm) digit height makes it suitable for medium-distance viewing in instrumentation, industrial control panels, point-of-sale terminals, and test equipment where space is at a premium but clarity is paramount.

1.1 Key Features and Target Market

Ana'urar tana rarrabe ta hanyar ƙarfinta na haske, yana tabbatar da daidaitattun matakan haske a cikin batutuwan samarwa. Faɗin kusurwar kallo tana tabbatar da cewa nuni ya kasance mai iya karantawa daga matsayi daban-daban, wani muhimmin al'amari a cikin aikace-aikacen da aka ɗora a kan panel. Ingantaccen ingancin fasahar LED yana ba da dogon rayuwar aiki tare da ƙaramin kulawa. Wannan nuni yana nufi ga injiniyoyi da masu zane waɗanda ke aiki akan tsarin da aka haɗa, hanyoyin sadarwa na mutum-mutumi na masana'antu (HMI), na'urorin likita, da na'urorin lantarki na mabukaci waɗanda ke buƙatar ƙarfi, ƙarancin wutar lantarki, da karatun haruffa da lambobi masu haske sosai.

2. Nazarin Cikakken Sigogi na Fasaha

Cikakkiyar fahimtar sigogin lantarki da na gani yana da mahimmanci don ƙirar da'ira mai kyau da kuma tabbatar da ingantaccen aikin nuni.

2.1 Photometric and Optical Characteristics

The optical performance is central to the display's functionality. The average luminous intensity per segment is specified with a minimum of 320 µcd, a typical value of 800 µcd, and no stated maximum when driven at a forward current (I_F) of 1mA. This high brightness level, measured using a sensor filtered to match the CIE photopic eye-response curve, ensures excellent visibility. The device emits yellow light with a peak wavelength (λ_p) of 588 nm and a dominant wavelength (λ_d) of 587 nm at I_F=20mA, placing it firmly in the yellow region of the visible spectrum. The spectral line half-width (Δλ) is 15 nm, indicating a relatively pure color emission. The luminous intensity matching ratio between segments is 2:1 maximum, which helps maintain a uniform appearance across the display.

2.2 Electrical and Thermal Parameters

The electrical characteristics define the drive requirements and operational limits. The absolute maximum ratings are critical for preventing device failure. The power dissipation per segment must not exceed 70 mW. The peak forward current per segment is 60 mA, but this is only permissible under pulsed conditions (1 kHz, 10% duty cycle). The continuous forward current per segment is derated from 25 mA at 25°C at a rate of 0.33 mA/°C, meaning the allowable continuous current decreases as ambient temperature rises. The reverse voltage per segment must not exceed 5 V. The forward voltage (V_F) per segment typically ranges from 2.0V to 2.6V at I_F=20mA. The reverse current (I_R) is a maximum of 100 µA at V_R=5V. The device is rated for an operating and storage temperature range of -35°C to +85°C.

3. Binning System Explanation

The datasheet indicates that the devices are "categorized for luminous intensity." This implies a binning process where displays are sorted based on their measured light output at a standard test current (likely 1mA or 20mA). This ensures that end-users receive products with consistent brightness levels. While not explicitly detailed for wavelength/color or forward voltage in this document, such categorization is common practice in LED manufacturing to guarantee color uniformity and electrical performance matching, which is especially important in multi-digit or multi-segment applications to avoid visible differences between segments.

4. Performance Curve Analysis

The datasheet references "Typical Electrical / Optical Characteristic Curves," which are essential for detailed design work. Although the specific graphs are not provided in the text, typical curves for such a device would include:

• Relative Luminous Intensity vs. Forward Current (I-V Curve): Wannan jadawali yana nuna yadda fitowar haske ke ƙaruwa tare da ƙarfin tuƙi, yawanci a cikin yanayin ƙaramin layi, yana taimaka wa masu ƙira su zaɓi mafi kyawun halin yanzu don haske da inganci da ake so.
• Forward Voltage vs. Forward Current: This curve is crucial for designing the current-limiting circuitry and calculating power dissipation.
• Relative Luminous Intensity vs. Ambient Temperature: This shows the derating of light output as temperature increases, which is vital for applications in high-temperature environments.
• Spectral Distribution: A plot of relative intensity versus wavelength, confirming the peak and dominant wavelengths and the spectral width.

Designers should consult the full datasheet from the manufacturer for these precise graphical data.

5. Mechanical and Package Information

5.1 Physical Dimensions and Pinout

LTP-3362JS yana cikin daidaitaccen fakitin nuni na LED. Ana ba da ma'auni a cikin milimita tare da juzu'in gabaɗaya na ±0.25 mm. Zanen haɗin fil yana da mahimmanci don shimfidar PCB. Na'urar tana da fil 20 a cikin fakitin biyu-a-layin (DIP). Tana da tsarin haɗin gwiwar cathode na gama gari, tare da Fil 4 yana aiki azaman cathode na gama gari don Lamba 1 kuma Fil 10 a matsayin cathode na gama gari don Lamba 2. Sauran filayen sune anodes don sassan mutum ɗaya (A har zuwa U, tare da DP don maki goma) da sassa na musamman (misali, S, T don slash). An lura Fil 14 a matsayin \"Babu Haɗin\" (N/C). Zanen da'irar ciki yana nuna tsarin haɗakarwa, inda sassan da ke da alamar harafi iri ɗaya akan lambobi daban-daban a ciki aka haɗa su zuwa fil anode guda ɗaya, kuma ana zaɓar lambobi ta hanyar ƙarfafa nasu cathode na gama gari.

5.2 Polarity Identification and Mounting

The device uses a common cathode configuration. Proper polarity must be observed during installation. The package likely includes a notch, dot, or other marking to indicate Pin 1. The black face and white segments provide a clear visual indicator of the viewing side.

6. Soldering and Assembly Guidelines

The absolute maximum ratings specify soldering conditions: the leads can be subjected to 260°C for 3 seconds, measured 1/16 inch (approximately 1.59 mm) below the seating plane. This is a typical specification for wave soldering. For reflow soldering, a standard lead-free profile with a peak temperature around 260°C is suitable, but the specific time above liquidus should be minimized. Care must be taken to avoid excessive thermal stress. During handling, standard ESD (electrostatic discharge) precautions should be observed to protect the LED chips. For storage, the recommended range is -35°C to +85°C in a dry environment.

7. Packaging and Ordering Information

The part number is LTP-3362JS. The "JS" suffix likely denotes specific characteristics such as color (Yellow) and package style. Standard packaging for such components is often in anti-static tubes or trays, and then placed in reels or boxes for automated assembly. The exact packaging quantity (e.g., 50 pieces per tube) would be specified in separate packaging documentation. The datasheet revision is A, and the effective date is 09/11/2003.

8. Mapendekezo ya Matumizi

8.1 Mazingira ya Kawaida ya Matumizi

LTP-3362JS inafaa kabisa kwa matumizi yoyote yanayohitaji usomaji wa herufi na nambari zenye wahusika wawili wadogo. Matumizi ya kawaida ni pamoja na: mita za dijiti na mita za kubana, vihesabu vya mzunguko, vihesabu vya mchakato, maonyesho ya hali ya chaja za betri, virekebishaji vya vifaa vya sauti na mita za kiwango, na maonyesho ya hali/makosa ya vidhibiti vya viwanda.

8.2 Abubuwan Ɗauka na Ƙira da Aiwarta na Lantarki

Ƙirar da wannan nuni yana buƙatar da'irar turawa mai yawa saboda tsarinsa na gama gari, tsarin anode mai yawa. Microcontroller tare da isassun fil ɗin I/O ko ƙwararrun IC na turawa LED (kamar MAX7219 ko HT16K33) ya zama dole. Dole ne direban ya samo wutar lantarki zuwa filayen anode na sashe kuma ya nutsar da wutar lantarki daga filayen cathode na lambobi. Resistors masu iyakancewar halin yanzu sun zama wajibi ga kowane layin anode na sashe don saita halin yanzu da ake so (misali, 20 mA don mafi girman haske). Ƙimar resistor za a iya ƙididdige ta ta amfani da R = (V_CC - V_F) / I_F. With a V_CC of 5V and a typical V_F Of 2.3V at 20mA, the resistor would be approximately 135 Ohms. The multiplexing frequency should be high enough to avoid visible flicker, typically above 100 Hz. Designers must also consider the total power dissipation, especially when driving multiple segments simultaneously at high current.

9. Technical Comparison and Differentiation

Compared to older technologies like vacuum fluorescent displays (VFDs) or simpler red GaAsP LEDs, the AlInGaP yellow LED used in the LTP-3362JS offers superior efficiency, higher brightness, better color stability over temperature, and longer lifetime. Compared to contemporary white or blue GaN-based LEDs with filters, the direct yellow emission of AlInGaP is more efficient and provides better color saturation. Its key differentiators are the specific yellow color point, high contrast due to the black face, and the 17-segment format which allows for a more comprehensive alphanumeric set than a standard 7-segment display, while remaining more cost-effective and simpler to drive than a full dot-matrix display.

10. Frequently Asked Questions (FAQ)

Q: Wane ne bambanci tsakanin kololuwar tsayin raƙuman ruwa da rinjayen tsayin raƙuman ruwa?
A: Kololuwar tsayin raƙuman ruwa (λ_p) shine tsayin raƙuman ruwa inda bakan fitarwa ke da mafi girman ƙarfinsa. Rinjayen tsayin raƙuman ruwa (λ_d) shine tsayin raƙuman ruwa guda ɗaya na hasken monochromatic wanda ya yi daidai da launin da ake gani na hasken da aka fitar. Ga ƙaramin bakan kamar wannan LED, suna kusa sosai (587nm da 588nm).

Q: Ina iya tuka wannan nuni da tsayayyen DC na yanzu ba tare da haɗaɗɗun aiki ba?
A: A fasaha, i, amma ba shi da inganci sosai kuma ba shine amfani da aka yi niyya ba. Za ka buƙaci haɗa kowane ɓangaren anode zuwa tushen ƙarfin lantarki mai iyakacin ƙarfi da kowane lambobi cathode zuwa ƙasa. Wannan zai buƙaci masu tuki 18 don sassan da kuma 2 don lambobi, jimlar masu tuki 20 don nuni mai lamba 2, wanda ba shi da amfani. Haɗaɗɗun aiki yana rage yawan masu tuki da ake buƙata sosai.

Q: Ta yaya zan iya ƙididdige ɓarnawar wutar lantarki don dukan nuni?
A: In a multiplexed setup, power is calculated based on the average current. If driving at I_F per segment with a duty cycle (D) for each digit (D=1/Number of digits for equal brightness), the average power per segment is V_F * I_F * D. Sum this for all illuminated segments.

Q: What does "Luminous Intensity Matching Ratio" mean?
A: It specifies the maximum allowable ratio between the brightest and dimmest segment in a device (e.g., 2:1). A ratio of 2:1 means the dimmest segment must be at least half as bright as the brightest segment, ensuring uniformity.

11. Practical Design and Usage Examples

Case Study 1: Digital Timer Interface. A designer uses the LTP-3362JS to show minutes and seconds (MM:SS) on a custom timer circuit. They use a low-power microcontroller to manage the multiplexing. To conserve power, they drive the LEDs at 10mA instead of 20mA, accepting a lower but still sufficient brightness. The black face ensures readability even under bright workshop lighting.

Case Study 2: Sensor Readout Unit. In a temperature and humidity data logger, the display shows codes like "tH" for temperature high alarm or numeric values. The 17-segment capability allows displaying letters "C" or "F" for temperature units. The wide operating temperature range matches the environmental requirements of the logger itself.

12. Technical Principle Introduction

LTP-3362JS e fa'avae i luga o le semiconductor electroluminescence. O le AS-AlInGaP (Aluminum Indium Gallium Phosphide) material system o se semiconductor tuusa'o bandgap. Pe a fa'aogaina se voluma i luma i luga o le p-n junction, e tuiina electrons ma pu i totonu o le vaega galue. Latou te toe tu'ufa'atasia fa'avevela, fa'asa'oloto le malosi i foliga o photons. O le tu'ufa'atasiga fa'apitoa o le AlInGaP alloy e fuafua ai le malosi o le bandgap, lea e fetaui tonu ma le umi galu (lanu) o le malamalama e fa'aolaina—i lenei tulaga, samasama (~587-588 nm). O laulau epitaxial e tupu i luga o se GaAs substrate. O le tino afifi epoxy uliuli e mitiia le malamalama si'osi'omaga e fa'aleleia ai le eseesega, a'o le foliga tioata ua mamanuina e fa'amalieina le tulimanu va'ai.

13. Technology Trends and Evolution

AlInGaP technology represents a mature and highly efficient solution for red, orange, amber, and yellow LEDs. Current trends in display technology are moving towards higher density, full-color capability, and integration. While discrete segment displays like the LTP-3362JS remain vital for specific applications, there is a broader shift towards organic LED (OLED) and micro-LED displays for high-resolution graphical interfaces. However, for simple, low-cost, high-reliability, and high-brightness alphanumeric readouts, LED segment displays continue to be widely used. Future developments may include even higher efficiency materials, integrated driver circuits within the display package (reducing external component count), and a wider range of package sizes and colors to meet diverse design needs. The principle of multiplexing to reduce pin count remains a fundamental and enduring technique in display driver electronics.