LTS-5601AJG 0.56-Inch Seven-Segment LED Display Datasheet - Character Height 14.22mm - Green AlInGaP - Technical Documentation

1. Product Overview

The LTS-5601AJG is a high-performance, single-digit, seven-segment display module. Its primary function is to provide clear and bright numeric and limited alphabetic character displays in electronic devices. Its core technology is based on Aluminum Indium Gallium Phosphide (AlInGaP) semiconductor material, specifically designed for efficient light emission within the green-yellow spectral range. The device features a common anode configuration, meaning the anodes of all LED segments are internally connected to a common pin, simplifying the current drive circuitry. The display utilizes a gray panel, which enhances contrast and improves readability under various ambient lighting conditions by reducing reflections. The segments themselves emit a distinctive green light, chosen for its high luminous efficiency and excellent visibility to the human eye. This product is specifically designed for digital indication applications requiring reliability, longevity, and energy efficiency.

1.1 Core Advantages and Target Market

This display offers several key advantages that make it suitable for a wide range of industrial and consumer applications. Its low power requirement is a significant benefit, facilitating integration into battery-powered or energy-conscious systems. High brightness and contrast ensure clear readability even in bright ambient conditions. The wide viewing angle provides consistent visual performance from different perspectives, which is crucial for panel meters and instruments. The solid-state reliability of LED technology, with no moving parts and strong resistance to shock and vibration, ensures a long operational life. The device is also binned for luminous intensity, meaning products are sorted and tested to meet specific brightness standards, guaranteeing performance consistency across production batches. The target markets for this component include test and measurement equipment, industrial control panels, medical devices, automotive dashboards (for aftermarket or auxiliary displays), consumer appliances, and any electronic system requiring durable and clear numeric readouts.

2. In-depth Analysis of Technical Parameters

This section provides a detailed and objective analysis of the key electrical, optical, and thermal parameters specified in the datasheet. Understanding these values is crucial for proper circuit design and ensuring the display operates within its safe and optimal performance window.

2.1 Absolute Maximum Ratings

Viwango hivi vinabainisha mipaka ya mkazo ambayo inaweza kusababisha uharibifu wa kudumu wa kifaa. Havitumiki kwa uendeshaji wa kawaida.

• Power consumption per segment:70 mW. This is the maximum electrical power that a single segment can convert into heat (and light) without risk of damage. Exceeding this value, especially continuously, may lead to overheating, accelerated luminous flux degradation, and eventual failure.
• Peak forward current per segment:60 mA (kwa mzunguko wa kazi 1/10, upana wa msukumo 0.1ms). Thamani hii ya kawaida inaruhusu mkondo wa juu zaidi wa msukumo mfupi kufikia kilele cha papo hapo cha mwangaza, inafaa kwa mpango wa kuzidisha njia nyingi au kuonyesha kwa mwangaza mkubwa. Mzunguko maalum wa kazi na upana wa msukumo ni muhimu sana; mkondo wa wastani bado lazima ufuatane na thamani ya kawaida ya kuendelea.
• Mkondo wa mwendelezo wa mbele kwa kila sehemu:25 mA (kwa 25°C). Hii ndiyo mkondo wa juu unaopendekezwa kwa taa ya mwendelezo thabiti ya kila sehemu. Uainishaji unabainisha kiwango cha kupunguza cha 0.33 mA/°C kwa joto la juu ya 25°C. Hii inamaanisha kuwa ikiwa joto la mazingira (Ta) linaongezeka, mkondo wa juu unaoruhusiwa wa mwendelezo lazima upunguzwe kwa mstari ili kuzuia joto kupita kiasi. Kwa mfano, kwa 50°C, mkondo wa juu ni 25 mA - (0.33 mA/°C * 25°C) = 16.75 mA.
• Voltage ya nyuma kwa kila sehemu:5 V. LEDs have a low reverse breakdown voltage. Applying a reverse bias exceeding 5V may cause a sudden increase in reverse current, potentially damaging the PN junction.
• Operating and storage temperature range:-35°C to +85°C. The device is rated for operation and storage within this wide temperature range, making it suitable for harsh environments.
• Joto la kuchomelea:260°C, kwa sekunde 3, mahali pa kipimo iko chini ya ndege ya usakinishaji kwa inchi 1/16 (≈1.6mm). Hii inafafanua mkunjo wa kuchomelea reflow, ili kuepuka uharibifu wa joto kwa chip ya LED wakati wa usakinishaji.

2.2 Electrical and Optical Characteristics

These parameters are measured under specific test conditions (typically Ta=25°C) and define the typical performance of the device.

• Average luminous intensity (I_V):320 μcd (min.), 900 μcd (typ.), at I_FAt I_F = 1mA. This is a measure of the perceived luminous power emitted by the segment. The wide range (minimum to typical) indicates natural variations in manufacturing; designers should use the minimum value for worst-case brightness calculations. The 1mA test current is a standard low-current condition for characterizing luminous efficacy.
• Peak Emission Wavelength (λ_p):571 nm (typical), at I_F_F=20mA. This is the wavelength at which the spectral power distribution of the emitted light reaches its maximum. 571 nm is located in the green-yellow region of the visible spectrum.
• Spectral Line Half-Width (Δλ):15 nm (typical value). This indicates the spectral purity or bandwidth of the emitted light. The value of 15 nm is relatively narrow, characteristic of AlInGaP LEDs, producing a saturated green.
• Dominant wavelength (λ_d):572 nm (typical value). This is the single wavelength that most closely matches the perceived color of the light by the human eye. In this case, it is very close to the peak wavelength.
• Forward voltage per segment (V_F):2.05V (minimum), 2.6V (typical), at I_F=20mA. This is the forward voltage drop when the LED segment is operating. It is crucial for designing the current limiting circuit. The driving supply voltage must be higher than V_F. The typical 2.6V is higher than standard GaAsP red LEDs, but lower than many blue/white LEDs.
• Reverse current per segment (I_R):100 μA (maximum), at V_RWhen =5V. This is the leakage current when the maximum reverse voltage is applied.
• Luminous intensity matching ratio (I_V-m):2:1 (maximum). This specifies the ratio under the same driving conditions (I_FThe maximum allowable ratio between the brightest and darkest segments within a single device under a specified test current (e.g., =1mA). A 2:1 ratio ensures a reasonably uniform appearance.

3. Binning System Explanation

The datasheet states the product is "graded by luminous intensity." This refers to a post-production sorting process called "binning." After manufacturing, each display is tested and sorted into different performance groups (bins) based on key parameters. For the LTS-5601AJG, the primary binning characteristic is its luminous intensity at a standard test current (likely 1mA or 20mA). This ensures customers receive products with consistent brightness levels. While the datasheet provides the full Min/Typ range, production batches are typically offered within a narrower intensity range. Designers should consult specific procurement documents or contact the manufacturer for available bin codes. For applications using multiple displays side-by-side, consistent binning is crucial to prevent noticeable brightness variations between units.

4. Performance Curve Analysis

Mwongozo umerejelea "Mikondo ya Kawaida ya Umeme/Optiki". Ingawa hakuna michoro maalum iliyotolewa katika maandishi, tunaweza kudhani yaliyomo yake ya kawaida na umuhimu wake. Mikondo hii inaonyesha kwa urahisi uhusiano kati ya vigezo muhimu, ikitoa ufahamu wa kina zaidi kuliko data ya nukta moja.

4.1 Mmenyuko wa Sasa wa Mbele dhidi ya Voltage ya Mbele (Mviringo wa I-V)

Mkondo huu wa msingi unaonyesha uhusiano wa kielelezo kati ya mkondo unaopita kwenye LED na voltage kwenye ncha zake mbili. Unaonyesha kwa picha jinsi voltage ya mbele (V_F) Specification. The curve will show a "knee" voltage (approximately 2V), beyond which the current increases rapidly with a small increase in voltage. This highlights why an LED must be driven by a current-limited source, not a voltage source, to prevent thermal runaway.

4.2 Luminous Intensity vs. Forward Current

This curve shows how the light output increases with the drive current. For AlInGaP LEDs, the relationship is typically linear over a wide current range, but becomes sublinear at very high currents due to efficiency droop (increased heating). This curve helps designers select an operating current to achieve the desired brightness while balancing efficiency and lifetime.

4.3 Luminous Intensity vs. Ambient Temperature

This curve describes the thermal dependence of light output. As the LED junction temperature increases, its luminous intensity typically decreases. The slope of this curve quantifies the thermal derating of brightness. This is crucial for designs operating in high-temperature environments, as the display may appear dimmer than expected at room temperature.

4.4 Uwezo wa Jamaa dhidi ya Wavelength (Spectrum)

This graph plots the spectral power distribution, showing the intensity of light emitted at each wavelength. It will center around a peak/dominant wavelength of 571-572 nm, with its shape defined by a 15 nm full width at half maximum. This curve confirms the LED's color characteristics.

5. Mechanical and Packaging Information

The device is accompanied by a detailed package dimension drawing (mentioned but not detailed in the text). Key mechanical features include a character height of 0.56 inches (14.22 mm), a standard size for medium-to-large numeric displays. The package is through-hole type (DIP - Dual In-line Package) with 10 pins at a 0.1-inch (2.54 mm) pitch, a universal standard for easy PCB mounting and hand-built prototyping. The gray panel and green segments are part of the package design. The note "Rt. Hand Decimal" in the description indicates the position of the decimal point relative to the digits. A right-hand decimal point is standard for most numeric displays. The internal schematic shows a common anode connection: pins 3 and 8 are internally connected together as the common anode for all segments, while pins 1, 2, 4, 5, 6, 7, 9, and 10 are the individual cathodes for segments E, D, C, DP, B, A, F, and G, respectively. This configuration is well-suited for multiplexing with a microcontroller, where the common anodes are driven sequentially (supplied with current), and the cathodes are grounded through current-limiting resistors to illuminate specific segments.

6. Soldering and Assembly Guide

Usindikaji sahihi ni muhimu sana kudumisha uaminifu. Viwango vya juu kabisa vya kikomo vinaelezea joto la kuchomelea kuwa 260°C, kwa sekunde 3, na kipimo kinachukuliwa mm 1.6 chini ya ndege ya usakinishaji. Hii inalingana na mkunjo wa kawaida wa kuchomwa tena bila risasi (mfano, IPC/JEDEC J-STD-020). Wakati wa kuchomelea mawimbi au kuchomelea kwa mikono, lazima kuzingatiwa kupunguza wakati wa jumla wa mfiduo wa joto, ili kuzuia uharibifu kwa chip ya LED, waya za kuunganisha, au kifurushi cha plastiki. Inapendekezwa kutumia kizuizi cha joto kwenye pini wakati wa kuchomelea kwa mikono. Epuka kutumia mkazo wowote wa kiufundi kwenye kifurushi au pini. Kifaa kinapaswa kuhifadhiwa katika anga kavu, lisilo na umeme wa tuli, katika safu ya halijoto iliyobainishwa ya -35°C hadi +85°C, ili kuzuia unyevunyevu (ambao unaweza kusababisha "popcorn effect" wakati wa kuchomwa tena) na uharibifu wa nyenzo.

7. Mapendekezo ya Matumizi

7.1 Saketi ya Matumizi ya Kawaida

For common anode displays like the LTS-5601AJG, the most common driving method is multiplexing. In a multiplexing circuit, the common anode pins (3 and 8) are connected to the collector (or drain) of an NPN transistor (or N-channel MOSFET), which acts as a high-side switch. The emitter/source is connected to the positive supply (Vcc). The base/gate is controlled by a microcontroller GPIO pin. Each segment cathode pin is connected to a current-limiting resistor, then to a second transistor or a dedicated LED driver IC (configured as a current sink) controlled by the microcontroller. The microcontroller cycles rapidly, turning on the anode transistor for one digit at a time while setting the corresponding cathode pattern for that digit. Persistence of vision makes all digits appear continuously lit. Each segment typically uses a forward current of 10-20 mA, and the resistor is calculated using the formula R = (Vcc - V_F- V_CE(sat)) / I_F. For a 5V power supply, V_F=2.6V, and V_CE(sat)=0.2V, target I_FIf =15mA, then R = (5 - 2.6 - 0.2) / 0.015 ≈ 147 Ω (use 150 Ω).

7.2 Design Considerations

• Current Limiting:Tumia daima upinzani wa mfululizo au kiendeshi cha mkondo wa mara kwa mara. Usiwahi kuunganisha LED moja kwa moja kwa chanzo cha voltage.
• Mzunguko wa kuzidisha njia:使用足够高的刷新率以避免可见闪烁，通常每个数字>60 Hz。对于4位多路复用，扫描速率应>240 Hz。
• Mkondo wa kilele katika kuzidisha njia:Since each digit is only illuminated for a portion of the time (duty cycle = 1/N, where N is the number of digits), the instantaneous current per segment can be set higher than the continuous DC rating to achieve the desired average brightness, but it must not exceed the peak forward current rating. For example, in 4-digit multiplexing (1/4 duty cycle), to achieve an average brightness equivalent to 10mA DC, you can drive it with 40mA pulses, which is within a 60mA peak rating.
• Viewing Angle:ESD Protection:
• Ingawa haijaainishwa wazi kama kifaa nyeti, kwa vifaa vyote vya semiconductor, inashauriwa kuchukua tahadhari za kawaida za ESD wakati wa usindikaji na usanikishaji.8. Ulinganisho wa Kiufundi na Tofauti

LTS-5601AJG hutofautishwa hasa kupitia teknolojia ya AlInGaP inayotumika. Ikilinganishwa na teknolojia za zamani (kama GaAsP ya kawaida) zilizotumika kwa LED nyekundu na manjano, AlInGaP hutoa ufanisi mkubwa zaidi wa utoaji mwanga, na hivyo kufanya maonyesho kuwa mkubwa zaidi kwa mkondo sawa wa pembejeo, au kufikia mwangaza sawa kwa nguvu ya chini. Pia hutoa uthabiti bora wa joto na usawa bora wa rangi. Ikilinganishwa na LED ya kijani ya GaP, AlInGaP ya kijani kwa kawaida huwa na kijani safi zaidi (wavelength mfupi) na ufanisi wa juu zaidi. Ikilinganishwa na LED za kisasa za InGaN za bluu/kijani/nyeupe, AlInGaP kwa kawaida huwa na ufanisi zaidi katika safu ya wigo nyekundu-kahawia-manjano-kijani, lakini haiwezi kutoa mwanga wa bluu au mweupe. Kwa maonyesho ya nambari yenye kijani safi, AlInGaP inawakilisha chaguo la teknolojia yenye utendaji wa hali ya juu na iliyokomaa. Usanidi wake wa anode ya pamoja pia ni faida ya vitendo kwa mifumo inayotegemea microcontroller, kwani hurahisisha upande wa usambazaji wa umeme wa saketi ya kuendesha.

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

9.1 Why are there two common anode pins (3 and 8)?

Pini hizi mbili zimeunganishwa ndani. Ubunifu huu una madhumuni kadhaa: 1) Kutoa ulinganifu na uthabiti wa mitambo kwa kifurushi. 2) Kuruhusu usambazaji bora wa mkondo, kupunguza msongamano wa mkondo kupitia pini moja, jambo linalofaa kwa matumizi ya mwangaza wa juu. 3) Kutoa urahisi katika mpangilio wa PCB; mbuni anaweza kuchagua kuunganisha pini moja au zote mbili kwenye mzunguko wa kuendesha.

9.2 Can I drive this display with a 3.3V microcontroller system?

Ndiyo, lakini inahitaji usanifu makini. Voltage ya kawaida ya mbele (2.6V) ni chini ya 3.3V, kwa hivyo inawezekana. Hata hivyo, kwa upinzani rahisi wa mfululizo, ukingo wa voltage (3.3V - 2.6V = 0.7V) ni wa chini. Tofauti hii ndogo ya voltage inamaanisha V

au mabadiliko madogo ya voltage ya usambazaji yatasababisha mabadiliko makubwa ya sasa. Kwa utendakazi thabiti, ni bora kutumia IC maalum ya kuendesha LED ya sasa mara kwa mara au chanzo cha sasa kinachotegemea transistor, ambazo zinaweza kufanya kazi chini ya voltage ya ukingo, badala ya upinzani rahisi._F9.3 Je, ninaweza kuhesabu jumla ya matumizi ya nguvu ya skrini vipi?

Kwa onyesho la tuli (lisilo la multiplexing) ambapo sehemu zote na nukta ya desimali zinawaka: Nguvu = Idadi ya sehemu zinazowaka * I

* V_F. For 8 segments (7 segments + DP), with I_F=20mA and V_F=2.6V, P = 8 * 0.02 * 2.6 = 0.416 W. In multiplexed applications, the average power is the sum of the power of each lit segment averaged over time. For 4-digit multiplexing lighting one digit at a time, the average current per segment is I_F/ 4._F10. Uchunguzi wa Kesi Halisi ya Ubunifu

Mazingira:

Tumia microcontroller kubuni onyesho rahisi la voltamita yenye tarakimu 4.Implementation:

Use four LTS-5601AJG displays. The common anode of each digit is connected to four independent GPIO pins via NPN transistors (e.g., 2N3904). The eight segment cathodes (A-G and DP) from all four displays are connected together and then linked to another eight GPIO pins through 150Ω current-limiting resistors. The microcontroller measures the voltage with its ADC, converts it to a decimal number, and extracts the four digits. It then enters a continuous loop: turn off all anode transistors, set the cathode pattern for digit 1's value, turn on digit 1's anode transistor, wait a short time (about 2ms), then repeat this process for digits 2, 3, and 4. This loop repeats at a rate exceeding 100 Hz, making the display appear stable. Brightness is controlled by the value of the current-limiting resistors and/or the duty cycle (on-time) within each digit's cycle.11. Kanuni ya Uendeshaji

The LTS-5601AJG is based on the principle of electroluminescence in a semiconductor PN junction. The active region consists of AlInGaP layers grown on an opaque GaAs substrate. When a forward bias exceeding the junction's built-in potential is applied (anode positive relative to cathode), electrons from the N-type material and holes from the P-type material are injected into the active region. There, they recombine, releasing energy in the form of photons. The specific composition of the AlInGaP alloy determines the bandgap energy, which in turn determines the wavelength (color) of the emitted light—in this case, green (approximately 572 nm). The opaque substrate helps reflect the emitted light outward, improving overall light extraction efficiency. The gray panel filter absorbs ambient light, increasing contrast by reducing reflections from the underlying materials.

12. Mwelekeo wa Teknolojia

Teknolojia ya AlInGaP ni suluhisho lililokomaa na lililoboreshwa sana kwa LED nyekundu, za kahawia na za kijani kibichi zenye ufanisi wa juu. Mielekeo ya sasa katika teknolojia ya maonyesho kwa viashiria kama hivi ni pamoja na kusukumwa kwa uendelevu kwa ufanisi mkubwa zaidi wa mwanga (lumeni zaidi kwa wati) ili kuwezesha matumizi madogo ya nguvu na kupunguza uzalishaji wa joto. Pia kuna maendeleo endelevu katika ufungaji ili kuruhusu mikondo ya juu zaidi ya kuendesha na usimamizi bora wa joto, na hivyo kuwezesha maonyesho yenye mwanga zaidi. Zaidi ya hayo, ushirikiano ni mwelekeo muhimu; ingawa maonyesho ya sehemu saba tofauti yanaendelea kuwa maarufu kwa unyenyekevu na ufanisi wa gharama, kuna soko linalokua la moduli za maonyesho zilizoshirikishwa ambazo ni pamoja na IC ya kiendeshi, kiolesura cha kidhibiti kidogo (kama I2C au SPI), na wakati mwingine hata jenereta ya herufi, na hivyo kurahisisha mchakato wa kubuni kwa wahandisi wa mwisho. Hata hivyo, kwa matumizi yanayohitaji ubinafsishaji, mwanga mkali, au umbo maalum la mitambo, vipengele tofauti kama LTS-5601AJG vinaendelea kuwa chaguo muhimu na la kuaminika.

AlInGaP technology is a mature and highly optimized solution for high-efficiency red, amber, and pure green LEDs. Current trends in display technology for such indicators include a continued push for even higher luminous efficacy (more lumens per watt) to enable lower power consumption and reduced heat generation. There is also ongoing development in packaging to allow for higher maximum drive currents and better thermal management, enabling brighter displays. Furthermore, integration is a key trend; while discrete seven-segment displays remain popular for their simplicity and cost-effectiveness, there is a growing market for integrated display modules that include the driver IC, microcontroller interface (like I2C or SPI), and sometimes even a character generator, simplifying the design process for end engineers. However, for applications requiring customization, high brightness, or specific mechanical form factors, discrete components like the LTS-5601AJG continue to be a vital and reliable choice.