7.62mm White Seven Segment Display Datasheet - 0.3 Inch

1. Product Overview

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 using 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

These ratings define the limiting conditions beyond which permanent damage to the device may occur; they are not normal operating conditions.

• Reverse Voltage (V_R):5V. Exceeding this reverse voltage may cause junction breakdown.
• Continuous Forward Current (I_F):25mA. This is the maximum DC current that can be continuously passed through an LED segment.
• Peak Forward Current (I_FP):60mA. Wannan babban ƙarfin yana ba da izini ne kawai a cikin yanayin bugun jini, musamman ma a cikin rabon aiki 1/10, mitar 1kHz. Yana ba da damar samun haske mafi girma a cikin ɗan gajeren lokaci, misali a cikin nunin turawa mai yawa.
• Amfani da wutar lantarki (P_d):60mW. Wannan shine matsakaicin ƙarfin da na'urar za ta iya ɓata a matsayin zafi, wanda aka lissafta shi da ƙarfin lantarki na gaba (V_F) wanda aka ninka da ƙarfin lantarki na gaba (I_F).
• Yanayin aiki (T_opr):-40°C zuwa +85°C. Tabbatar da cewa na'urar tana aiki da kyau a cikin wannan kewayon zafin yanayi.
• Yanayin ajiya (T_stg):-40°C to +100°C. The device can be stored in this wider range under non-operating conditions.
• Soldering temperature (T_sol):Maximum 260°C, duration not exceeding 5 seconds. This parameter defines the temperature profile limit for wave soldering or reflow soldering to prevent damage to the plastic package and internal bonding.

2.2 Electro-Optical Characteristics

These parameters are measured at a standard ambient temperature of 25°C, defining the typical performance of the device under normal operating conditions.

• Luminous intensity (I_v):When forward current (I_FWhen the current is 10mA, the typical value 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 current-limiting circuits (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. Grading System Description

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 end users, 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 numeric assembly have uniform brightness, which is crucial for aesthetics and readability. Specific binning codes or categories may be detailed in separate ordering information.

4. Performance Curve Analysis

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

4.1 Spectral Distribution

The spectral distribution curve (at Ta=25°C) will show the relative luminous intensity versus wavelength (λ_p, unit is nm). For this white LED display, the curve will not be a single narrow peak but a broader spectrum, with a peak around 632 nm due to the underlying AlGaInP chip. The phosphor in the white diffusing resin provides additional emission at other wavelengths, resulting in a white appearance. The 20 nm bandwidth indicates the width of the main emission peak.

4.2 Forward Current vs. Forward Voltage (IV Curve)

This curve plots forward current (I_F, unit is mA) versus forward voltage (V_F, unit is V) at 25°C. It demonstrates the exponential relationship characteristic of a diode. This curve is crucial for understanding the dynamic resistance of the LED and for designing precise constant current drivers, especially for applications requiring dimming or precise brightness control. The typical V_Fvalue of 2.0V at 20mA is a point on this curve.

4.3 Forward Current Derating Curve

This is a key chart for thermal management. It plots the maximum allowable continuous forward current (I_FThe relationship between current (unit: mA) and ambient temperature (°C). As the ambient temperature increases, the internal junction temperature of the LED also rises. To prevent overheating, accelerated light degradation, or failure, the maximum allowable current must be reduced. This curve provides the derating factor, showing how much the 25mA rated value must be reduced for reliable operation at high temperatures (up to 85°C operating temperature).

5. Mechanical and Packaging Information

5.1 Package Dimensions and Drawings

The device uses a standard through-hole DIP package style. The package dimension drawing provides all key mechanical dimensions: overall height, width, and length; digit window size and position; pin pitch, diameter, and length; and mounting plane. The drawing specifies a general tolerance of ±0.25mm (unless otherwise noted), with all dimensions in millimeters. Accurate interpretation of this drawing is necessary for designing the PCB footprint, panel cutouts, and ensuring proper alignment and installation.

5.2 Internal Circuit Diagram and Polarity

The datasheet contains an internal circuit diagram. For the common-cathode seven-segment display (implied by the application), this diagram shows all eight LEDs (segments a through g, plus the decimal point DP), with their anodes connected to individual pins and their cathodes internally connected to a common pin (or two internally connected pins). This diagram is crucial for correctly connecting the display. The pinout defining which pin controls which segment and the common connection is provided in this section or the dimension drawing. Incorrect connection may cause the display not to light or result in permanent damage.

6. Soldering and Assembly Guide

Madaidaicin sigogin haɗin da aka bayar shine matsakaicin zafin haɗi na 260°C, tsawon lokacin da bai wuce dakika 5 ba. Wannan ya dace da tsarin haɗin igiyar igiyar ruwa. Don haɗin hannu ta amfani da ƙarfe mai zafi, ya kamata a kula don rage tsawon lokacin bayyanar zafi ga kowane ƙugiya, don hana narkewar kayan rufi na filastik ko lalata igiyar haɗin ciki. Kafin amfani, ya kamata a adana na'urar a cikin yanayin bushewa a cikin ƙayyadaddun kewayon -40°C zuwa +100°C. Muhimmin abin lura a cikin iyakokin aikace-aikace ya jaddada hankali ga rashin ƙarfi na fitar da tashin hankali. LED chip yana da sauƙin lalacewa ta hanyar tashin hankali. Sharuɗɗan kulawa da aka ba da shawarar sun haɗa da amfani da bel ɗin wuyan hannu, tashar aiki mai hana tashin hankali da bene, kafet ɗin wutar lantarki, da kuma ingantaccen ƙasa na duk kayan aiki. Ana iya amfani da na'urar ion don daidaita caji akan kayan da ba su da wutar lantarki.

7. Packaging and Ordering Information

7.1 Packaging Specifications

Na'urar tana bin takamaiman tsarin marufi: Ana sanya na'urori 32 akan tire (mai yiwuwa tire mai hana tashin hankali ko kuma na'urar nadi). Sannan ana sanya irin waɗannan tire 64 a cikin akwati. A ƙarshe, ana haɗa akwatuna 4 su zama babban akwatin jigilar kaya. Saboda haka, cikakken akwatin ya ƙunshi 32 x 64 x 4 = 8,192 na'ura. Wannan bayanin yana da mahimmanci ga kayan aiki, sarrafa kaya, da tsara samarwa.

7.2 Label Description

Tambarin akan kayan marufi ya ƙunshi takamaiman lambobi: CPN (Lambar Samfurin Abokin Ciniki), P/N (Lambar Samfurin Masana'anta, misali ELD-306SURWA/S530-A3), QTY (Adadin Marufi), CAT (Matsakaicin Ƙarfin Haskakawa ko Rukunin Rarrabuwa), HUE (Maganin Launi), REF (Maganin Gabaɗaya), LOT No (Lambar Rukunin Samarwa da za a iya gano asali) da kuma lambar tambarin REFERENCE. Fahimtar waɗannan tambari yana da mahimmanci don ingantaccen gano sassa, gano inganci, da kuma tabbatar da cewa abubuwan da aka karɓa sun dace da ƙayyadaddun oda (musamman rarrabuwar ƙarfin haskakawa CAT).

8. Shawarwarin Zane na Aikace-aikace

8.1 Da'irar Aikace-aikace ta Al'ada

In a typical application, the anode pin of each segment is connected to a microcontroller I/O pin or a driver IC (such as a 74HC595 shift register or a dedicated LED driver) through a current-limiting resistor. The value of this resistor is calculated using Ohm's Law: R = (V_{Power Supply}- V_F) / I_F. For a 5V power supply, V_Fis 2.0V, and the desired I_FIf the current is 10mA, then the resistance is (5 - 2.0) / 0.01 = 300 ohms. The common cathode pin is connected to ground. For multiplexing multiple digits, the common cathode is switched by transistors, and the segment data is presented in a high-frequency sequence.

8.2 Tunani da Abubuwan Lura na Zane

• Current Limiting:Always use a series resistor or constant current driver. Connecting an LED directly to a voltage source will cause excessive current and immediate damage.
• Heat Dissipation:Follow the derating curve in high-temperature environments. In enclosed spaces, sufficient ventilation around the display may be required.
• Viewing Angle:Although not specified in this datasheet, the gray background and diffusing resin typically provide a wide viewing angle. Please confirm if the application requires specific viewing angle data.
• 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. Kwatancen Fasaha da Bambanci

Compared to ungraded generic displays, the key differentiation of this product lies in its luminous intensity grading, which ensures 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. Frequently Asked Questions (Based on Technical Parameters)

Q: Can I drive all segments continuously at 20mA simultaneously?
A: Yes, but total power dissipation must be considered. At V_FThe forward voltage is 2.0V, I_FWhen the current is 20mA, one segment dissipates 40mW. If all 8 segments (7 segments + DP) are lit, the total power consumption may 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 appearance 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 create white light perceived by 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 the diode test function of a multimeter, 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 dimension drawing will mark this pin (usually as "CC" or "Com. Cath.").

11. Practical Application Examples

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 including 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:The ambient temperature inside the oven may reach 70°C. Please refer to the forward current derating curve. At 70°C, the maximum allowable continuous current may be derated to, for example, 18mA. Since we use 9.1mA and employ multiplexed driving (with a duty cycle of 1/4 per digit), the actual average current per segment is even lower, ensuring reliable operation.
4. PCB Layout:Strictly design the pads according to the package dimension drawing. Ensure the panel cutout matches the bezel dimensions of the display. Place the current-limiting resistors and driver transistors close to the display connector to minimize noise.

12. Introduction to Working Principles

A seven-segment display is a component composed of seven (or eight, including the decimal point) light-emitting diodes arranged in a figure "8" pattern. Each LED constitutes a segment (labeled a through g). By selectively illuminating specific combinations of these segments, all decimal digits (0-9) and some letters (e.g., A, C, E, F) can be formed. In a common-cathode configuration, the cathodes (negative terminals) of all LEDs are internally connected to one or more common pins. To illuminate a segment, a positive voltage (through a current-limiting resistor) is applied to its individual anode pin, while the common cathode pin is connected to ground (0V). This allows independent control of each segment. The principle of white light emission involves electroluminescence in the semiconductor chip (AlGaInP), where electrons and holes recombine at the bandgap, releasing energy in the form of photons. The color of these photons is subsequently altered by a phosphor layer to produce white light.

13. Technical Trends and Background

Although through-hole displays like this remain crucial for reliability, maintainability, and high-power/industrial applications, the overall trend in electronics is miniaturization and automated assembly, favoring surface-mount technology. SMD seven-segment displays have a smaller footprint, lower profile, and are better suited for high-speed pick-and-place manufacturing. Furthermore, the adoption of dot-matrix displays and OLEDs is growing, offering greater flexibility in displaying graphics and alphanumeric characters compared to the limited character set of 7-segment devices. However, for simple, bright, low-cost numeric readouts, especially in harsh environments or where through-hole mounting is preferred for mechanical reasons, such displays maintain a strong and enduring market position. Integrating the driver IC directly into the display module (intelligent display) is another trend, simplifying the interface with the main microcontroller.