7.62mm White Seven-Segment Display Datasheet - 0.3 Inch

1. Muhtasari wa Bidhaa

This document details the technical specifications of a 7.62 mm (0.3 inch) character height seven-segment display. The device features a through-hole mounting design, with white luminous segments and a grey background surface. This combination provides high contrast and excellent readability, making it ideally suited for applications requiring clear display of numeric or limited alphanumeric information under various lighting conditions.

1.1 Core Advantages and Target Market

The core advantages of this display include its industry-standard dimensions, ensuring compatibility with existing panel cutouts and designs. It features low power consumption, contributing to energy-efficient end products. The devices are binned for luminous intensity, ensuring consistent brightness across multiple units in an assembly. Furthermore, it is manufactured with lead-free materials and complies with the RoHS directive, meeting modern environmental and regulatory standards.

Its target applications are broad, including household appliances, various instrument panels, and general-purpose digital readout displays. Its reliability under bright ambient light makes it a robust choice for both consumer and industrial interfaces.

2. In-depth Analysis of Technical Parameters

This section provides a detailed and objective analysis of the device's electrical, optical, and thermal characteristics based on its absolute maximum ratings and typical operating parameters.

2.1 Absolute Maximum Ratings

Viwango hivi vinaelezea hali ya kikomo ambayo inaweza kusababisha uharibifu wa kudumu wa kifaa, na sio hali ya kawaida ya uendeshaji.

• Voltage ya Kinyume (V_R):5V. Voltage ya kinyume inayozidi thamani hii inaweza kusababisha kuvunjika kwa kiungo.
• Mwendo wa Mbele unaoendelea (I_F):25mA. Hii ndiyo thamani ya juu zaidi ya mkondo wa moja kwa moja unaoweza kupita kwa kudumu kupitia sehemu ya LED.
• Mwendo wa Mwenendo wa Kilele (I_FP):60mA. This higher current is only permitted under pulse conditions, specifically at a duty cycle of 1/10 and a frequency of 1kHz. It allows for higher brightness in a short time, for example in multiplex-driven displays.
• Power Dissipation (P_d):60mW. This is the maximum power the device can dissipate as heat, calculated as the forward voltage (V_F) multiplied by the forward current (I_F).
• Operating Temperature (T_opr):-40°C to +85°C. The device is guaranteed to operate normally within this ambient temperature range.
• Storage Temperature (T_stg):-40°C hadi +100°C. Kifaa kinaweza kuhifadhiwa katika anuwai hii pana zaidi wakati haiko katika hali ya kufanya kazi.
• Joto la kuchomelea (T_sol):Kiwango cha juu cha 260°C, kwa muda usiozidi sekunde 5. Kigezo hiki kinafafanua kikomo cha mkunjo wa joto wa kuchomelea wimbi au kuchomelea tena, ili kuzuia uharibifu wa kifuniko cha plastiki na muunganisho wa ndani.

2.2 Electro-Optical Characteristics

Vigezo hivi hupimwa kwenye joto la kawaida la mazingira la 25°C, na vinafafanua utendaji wa kawaida wa kifaa chini ya hali za kawaida za uendeshaji.

• Nguvu ya mwanga (I_v):Wakati mkondo wa mbele (I_FAt a forward current of 10mA, the typical luminous intensity per segment is 6.4 millicandelas. The specified minimum value is 4.0 mcd. The datasheet notes a tolerance of ±10% for this parameter. This value is the average measured from a representative 7-segment character.
• Peak Wavelength (λ_p):At I_F=20mA, the typical value is 632 nanometers. This is the wavelength at which the emitted white light spectral power distribution reaches its maximum. The white color is achieved by using an AlGaInP chip material (for red/orange emission) combined with a white diffusing resin, which may contain phosphors to broaden the spectrum.
• Dominant Wavelength (λ_d):At I_F=20mA, the typical value is 624 nm. This is the wavelength of monochromatic light that most closely matches the perceived color of the light source. The difference between the peak wavelength and the dominant wavelength indicates that the spectral shape is not perfectly symmetrical.
• Spectral Radiant Bandwidth (Δλ):Typical value 20 nm. This parameter quantifies the width of the emission spectrum at half of its maximum power (Full Width at Half Maximum - FWHM).
• Forward Voltage (V_F):Typical value 2.0V, with a maximum of 2.4V at I_F=20mA. A tolerance of ±0.1V is noted. This parameter is crucial for designing the current-limiting circuit (typically a series resistor).
• Reverse Current (I_R):at a Reverse Bias Voltage (V_R) of 5V, maximum 100 µA. This is the small leakage current that flows when the device is reverse-biased within its maximum ratings.

3. Maelezo ya Mfumo wa Kugawa Daraja

The datasheet indicates the device is "binned by luminous intensity." This refers to a post-manufacturing sorting or classification process. Due to natural variations in semiconductor fabrication and assembly, the performance of individual LEDs will differ slightly. To ensure consistency for the end user, the manufacturer measures the light output of each unit and classifies them into groups with tight tolerances around a target value (e.g., 6.4 mcd ±10%). This allows designers to procure displays where all digits in a multi-digit assembly have uniform brightness, which is critical for aesthetics and readability. Specific binning codes or categories may be detailed in separate ordering information.

4. Uchambuzi wa Mviringo wa Utendaji

The datasheet references typical performance curves, which graphically illustrate how key parameters vary with operating conditions.

4.1 Usambazaji wa Wigo

Mkunjo wa Usambazaji wa Wigo (chini ya Ta=25°C) utaonyesha nguvu ya mwanga inayohusiana dhidi ya mabadiliko ya urefu wa wimbi (λ_p, katika vitengo vya nm). Kwa onyesho hili la LED nyeupe, mkunjo hautakuwa kilele kimoja nyembamba, bali wigo mpana zaidi, na kilele kikikaribia 632 nm kutokana na chipu ya msingi ya AlGaInP. Fosforasi katika resini nyeupe ya kusambaza hutoa mionzi ya ziada kwenye urefu tofauti wa wimbi, na hivyo kuunda muonekano mweupe. Upana wa wigo wa 20 nm unaonyesha upana wa kilele kikuu cha mionzi.

4.2 Mkondo wa Mbele dhidi ya Voltage ya Mbele (Mviringo wa IV)

Mkunjo huu, kwa 25°C, unachora mkondo wa mbele (I_F, katika vitengo vya mA) dhidi ya voltage ya mbele (V_F, katika vitengo vya V). Unaonyesha tabia ya uhusiano wa kielelezo ya diode. Mkunjo huu ni muhimu kwa kuelewa upinzani wa nguvu wa LED na kubuni madereva sahihi ya mkondo wa kudumu, hasa kwa matumizi yanayohitaji kudimisha au udhibiti sahihi wa mwangaza. Thamani ya kawaida ya V_Fya 2.0V kwenye 20mA ni hatua moja kwenye mkunjo huu.

4.3 Forward Current Derating Curve

Huu ni chati muhimu ya usimamizi wa joto. Inachora mkondo wa juu unaoruhusiwa unaoendelea wa mbele (I_FUhusiano wa kitengo cha mA) na joto la mazingira (°C). Kadiri joto la mazingira linavyoongezeka, joto la ndani la kiungio cha LED pia huongezeka. Ili kuzuia joto kupita kiasi, kuharibika kwa mwanga kwa kasi, au kushindwa kufanya kazi, ni lazima kupunguza upeo wa sasa unaoruhusiwa. Mkunjo huu unatoa kipengele cha kupunguza mzigo, ukionyesha ni kiasi gani thamani ya kawaida ya 25mA inahitaji kupunguzwa ili kufanya kazi kwa uaminifu katika hali ya joto la juu (hadi joto la uendeshaji la 85°C).

5. Mechanical and Packaging Information

5.1 Package Dimensions and Drawing

Kifaa hiki kinatumia mtindo wa kawaida wa ufungaji wa moja kwa moja wa DIP. Mchoro wa vipimo vya ufungaji hutoa vipimo vyote muhimu vya mitambo: urefu, upana na urefu wa jumla; vipimo na eneo la dirisha la nambari; umbali kati ya pini, kipenyo na urefu wa pini; na ndege ya usakinishaji. Mchoro huelezea uvumilivu wa jumla kuwa ±0.25mm (isipokuwa imeelezwa vinginevyo), na vipimo vyote viko katika milimita. Ufafanuzi sahihi wa mchoro huu ni muhimu kwa kubuni ufungaji wa PCB, kutoboa paneli, na kuhakikisha usawa na usakinishaji sahihi.

5.2 Internal Circuit Diagram and Polarity

Mwongozo wa maelezo una mchoro wa saketi ya ndani. Kwa onyesho la nambari saba za sehemu za pamoja za cathode (zinazoashiriwa na matumizi), mchoro unaonyesha LED zote nane (sehemu a hadi g, pamoja na nukta ya desimali DP), ambazo anode zake zimeunganishwa kwa pini tofauti, wakati cathode zake zimeunganishwa ndani kwa pini ya kawaida (au pini mbili zilizounganishwa ndani). Mchoro huu ni muhimu sana kwa kuunganisha onyesho kwa usahihi. Mpangilio wa pini unaofafanua ni pini gani inadhibiti sehemu gani na muunganisho wa kawaida umewekwa katika sehemu hii au katika mchoro wa vipimo. Kuunganisha vibaya kunaweza kusababisha onyesho kukosa mwanga au kuharibu kifaa kwa kudumu.

6. Soldering and Assembly Guide

Vigezo muhimu vya uchimbaji vinavyotolewa ni joto la juu la uchimbaji la 260°C, kwa muda usiozidi sekunde 5. Hii inatumika kwa mchakato wa uchimbaji wa wimbi. Kwa uchimbaji wa mikono kwa kutumia chuma cha kuchomelea, tahadhari inapaswa kuchukuliwa kupunguza wakati wa mfiduo wa joto kwa kila pini, ili kuzuia kuyeyusha kifurushi cha plastiki au kuharibu waya wa ndani wa kuunganisha. Kabla ya matumizi, kifaa kinapaswa kuhifadhiwa katika mazingira kavu katika anuwai maalum ya -40°C hadi +100°C. Uangalizi muhimu katika vizuizi vya matumizi unasisitiza usumbufu wa kutokwa na umeme tuli. Chip ya LED ni nyeti kwa uharibifu wa umeme tuli. Hatua za kuzuia zinazopendekezwa za usindikaji zinajumuisha matumizi ya mkanda wa mkono uliowekwa ardhini, kituo cha kuzuia umeme tuli na sakafu, pedi za kufanya umeme, na uwekaji ardhini sahihi wa vifaa vyote. Kionyeshaji cha ioni kinaweza kutumika kutuliza malipo kwenye vifaa visivyofanya umeme.

7. Packaging and Ordering Information

7.1 Packaging Specifications

Kifaa hiki hufuata mchakato maalum wa ufungaji: vifaa 32 hupachikwa kwenye tray (labda tray ya kuzuia umeme tuli au reel ya mkanda wa kubeba). Tray 64 kama hizo kisha huingizwa kwenye sanduku moja. Hatimaye, sanduku 4 huchanganywa kuunda kisanduku kikuu cha usafirishaji. Kwa hivyo, kisanduku kamili kina vifaa 32 x 64 x 4 = 8,192. Taarifa hii ni muhimu kwa uratibu, usimamizi wa hisa, na upangaji wa uzalishaji.

7.2 Label Description

Lebo kwenye vifaa vya ufungaji ina msimbo maalum: CPN (Nambari ya Bidhaa ya Mteja), P/N (Nambari ya Bidhaa ya Mtengenezaji, k.m. ELD-306SURWA/S530-A3), QTY (Idadi ya Ufungaji), CAT (Kiwango cha Nguvu ya Mwanga au Kategoria ya Kugawanya), HUE (Kumbukumbu ya Rangi), REF (Kumbukumbu ya Jumla), LOT No (Nambari ya Kundi la Uzalishaji Inayoweza Kufuatilia) na msimbo wa lebo ya REFERENCE. Kuelewa lebo hizi ni muhimu kwa utambuzi sahihi wa sehemu, ufuatiliaji wa ubora, na kuhakikisha vipengee vilivyopokelewa vinalingana na vipimo vilivyoagizwa (hasa kugawanya kwa nguvu ya mwanga CAT).

8. Mapendekezo ya Ubunifu wa Matumizi

8.1 Saketi ya Kawaida ya Matumizi

Katika matumizi ya kawaida, pini ya anode ya kila sehemu inaunganishwa kupitia kipingamizi cha kikomo cha mkondo hadi pini ya I/O ya kidhibiti kidogo au IC ya kuendesha (kama vile kirekebishi cha mabadiliko cha 74HC595 au kiendesha maalum cha LED). Thamani ya kipingamizi hiki huhesabiwa kwa kutumia sheria ya Ohm: R = (V_{Chanzo cha Nguvu}- V_F) / I_F. Kwa chanzo cha nguvu cha 5V, V_Fni 2.0V, I inayotarajiwa_FIkiwa ni 10mA, basi upinzani ni (5 - 2.0) / 0.01 = 300 ohms. Pini ya cathode ya kawaida imeunganishwa kwenye ardhi. Kwa kuzidisha tarakimu nyingi, cathode ya kawaida hubadilishwa na transistor, na data ya sehemu inawasilishwa kwa mpangilio wa mzunguko wa juu.

8.2 Mazingatio ya Ubunifu na Tahadhari

• Kizuizi cha Mkondo:Hakikisha unatumia upinzani wa mfululizo au kiendeshi cha mkondo wa kudumu. Kuunganisha LED moja kwa moja kwenye chanzo cha voltage kutasababisha mkondo mwingi na kuharibu mara moja.
• Upunguzaji wa Joto:Katika mazingira ya joto la juu, fuata mkunjo wa kupunguza nguvu. Katika nafasi zilizofungwa, uingizaji hewa wa kutosha unaweza kuhitajika karibu na kionyeshi.
• Pembe ya Mtazamo:Ingawa maelezo haya hayajaainisha, rangi ya nyuma ya kijivu na resini ya kusambaza kwa kawaida hutoa pembe pana ya mtazamo. Thibitisha ikiwa matumizi yanahitaji data maalum ya pembe ya mtazamo.
• ESD Protection:If the display is located in a user-accessible area, implement ESD protection diodes on the input lines and follow ESD handling guidelines during assembly.

9. Ulinganishi wa Kiufundi na Tofauti

Compared to unbinned general-purpose displays, the key differentiation of this product lies in its luminous intensity binning, ensuring brightness uniformity. Compared to surface-mount device alternatives, this through-hole version offers superior mechanical strength for applications subject to vibration or physical stress and facilitates manual assembly or prototyping. Compared to older technologies, the use of AlGaInP chip material combined with white diffused resin typically provides good color stability and lifespan. The specified operating temperature range of -40°C to +85°C is very robust, suitable for industrial and automotive environments, unlike many consumer-grade displays with narrower ranges (e.g., 0°C to 70°C).

10. Maswali Yanayoulizwa Mara kwa Mara (Kulingana na Vigezo vya Kiufundi)

Q: Can I drive all segments continuously at 20mA simultaneously?
A: Yes, but total power dissipation must be considered. At V_FFor 2.0V, I_FAt 20mA, one segment dissipates 40mW. If all 8 segments (7 segments + DP) are lit, the total power consumption could reach 320mW, which exceeds the device's absolute maximum power dissipation rating of 60mW. Therefore, you cannot continuously light all segments at 20mA. You must reduce the current per segment or use multiplexed driving, i.e., quickly lighting only one segment at a time, keeping the instantaneous power within the limits.

Q: What is the difference between the peak wavelength (632nm) and the white appearance?
A: The peak wavelength refers to the dominant color emitted by the LED chip itself (AlGaInP, red/orange). The white color is achieved by coating the chip with a white diffusing resin containing phosphor. The phosphor absorbs some of the blue/green light from the chip and re-emits light across a broader spectrum, which mixes with the chip's emission to produce white light to the human eye. The 632nm peak is a residual from the emission of the underlying chip.

Q: How to identify the common cathode pin?
A: The internal circuit diagram in the datasheet is the authoritative reference. Typically, for a common cathode display, using a multimeter's diode test mode, place the red probe on a segment pin and the black probe on different pins; the segment will light when the black probe is on the common cathode. The pinout in the dimensional drawing will mark this pin (usually as "CC" or "Com. Cath.").

11. Mfano wa Matumizi Halisi

Scenario: Designing a 4-digit temperature readout display for an industrial oven.
1. Circuit Design:Use a microcontroller or shift register with sufficient I/O pins to control the 7-segment lines (8 segments with DP). Use four NPN transistors (e.g., 2N3904) to switch the common cathode of each digit to ground. The microcontroller will multiplex the display: turn on the transistor for digit 1, send the segment pattern for the first digit, wait a short time (1-5ms), turn off digit 1, turn on digit 2, send the pattern for the second digit, and so on, cycling rapidly.
2. Component Calculation:For a 5V system, targeting a segment current of 10mA for good brightness, calculate the series resistor: R = (5V - 2.0V) / 0.01A = 300Ω. Using a standard 330Ω value yields I_F≈ 9.1mA.
3. Thermal Considerations:Joto la mazingira la tanuri linaweza kufikia 70°C. Tafadhali rejea kwenye mkunjo wa kupunguza mkondo wa mbele. Kwa 70°C, mkondo unaoruhusiwa wa juu zaidi unaoendelea unaweza kupunguzwa kwa mfano hadi 18mA. Kwa kuwa tunatumia 9.1mA na kuendesha kwa kuzidisha (duty cycle ya kila tarakimu ni 1/4), mkondo wa wastani halisi wa kila sehemu ni wa chini zaidi, na kuhakikisha uendeshaji unaotegemewa.
4. Mpangilio wa PCB:Unda padhi kwa kufuata kwa usahihi mchoro wa vipimo vya kifurushi. Hakikisha mashimo ya paneli yanalingana na vipimo vya mipaka ya kionyeshi. Weka vipingamizi vya kudhibiti mkondo na transistor za kuendesha karibu na kiunganishi cha kionyeshi ili kupunguza upepo wa sauti kwa kiwango cha juu.

12. Utangulizi wa Kanuni ya Kazi

Kionyeshi cha sehemu saba ni kifaa kilichoundwa na diodi saba (au nane, ikijumuisha nukta ya desimali) zinazotoa mwanga zilizopangwa katika umbo la "8". Kila LED hufanya sehemu moja (inayoonyeshwa kama a hadi g). Kwa kuwasha mchanganyiko maalum wa sehemu hizi kwa kuchagua, nambari zote za desimali (0-9) na baadhi ya herufi (kama A, C, E, F) zinaweza kuundwa. Katika usanidi wa cathode ya pamoja, cathode (terminali hasi) za LED zote zimeunganishwa ndani kwa pini moja au zaidi za pamoja. Ili kuwasha sehemu, voltage chanya inatumika kwenye pini yake ya anode ya pekee (kupitia kipingamizi cha kudhibiti mkondo), wakati pini ya pamoja ya cathode imeunganishwa kwenye ardhi (0V). Hii inaruhusu udhibiti wa kujitegemea wa kila sehemu. Kanuni ya utoaji wa mwanga mweupe inahusisha umeme-utoaji-mwanga kwenye chip ya semiconducta (AlGaInP), ambapo elektroni na mashimo hujiunga kwenye pengo la bendi na kutolea nishati kwa njia ya fotoni. Rangi ya fotoni hizi hubadilishwa na safu ya fosforesheni ili kutoa mwanga mweupe.

13. Mwelekeo na Mazingira ya Kiufundi

Ingawa vionyeshi vya kuingizwa moja kwa moja kama hivi bado ni muhimu kwa kutegemewa, ukarabati, na matumizi ya nguvu ya juu/viwanda, mwelekeo wa jumla wa bidhaa za elektroniki ni upungufu wa ukubwa na usanikishaji wa otomatiki, ukipendelea teknolojia ya kushikanwa kwa uso. Vionyeshi vya sehemu saba vya SMD vinachukua nafasi ndogo, urefu wa chini, na vinafaa zaidi kwa usanikishaji wa kasi wa chip. Zaidi ya hayo, upitishaji wa vionyeshi vya gridi ya dots na OLED unaongezeka, ambazo hutoa urahisi zaidi katika kuonyesha picha na herufi-nambari kuliko seti ndogo ya herufi za kifaa cha sehemu 7. Hata hivyo, kwa kuonyesha kusoma tarakimu rahisi, nyangavu, na ya bei nafuu, hasa katika mazingira magumu au ambapo usakinishaji wa kuingizwa moja kwa moja unapendelewa kwa sababu za mitambo, vionyeshi kama hivi bado vina nafasi thabiti na ya kudumu katika soko. Ujumuishaji wa IC ya kuendesha moja kwa moja kwenye moduli ya kionyeshi (kionyeshi chenye akili) ni mwelekeo mwingine, unaorahisisha interface na microcontroller kuu.