0.28 inch 4-digit seven segment led display

0.28 inch 4-digit seven segment led display

Series No:

BL-Q28I-41

Weight:(g/pcs)

2.2

Dimension:(mm)

32.2 x 10.1 x 5.8

Character Height: (inch)

0.28 inch

Specification:

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Inquiry

Description:

0.28 inch four numeric LED display

Features

  • 0.28-Inch Digit Height (7.00mm): Provides clear visibility for numeric displays, suitable for applications requiring small, easily readable digits.
  • Dimensions (Width x Height): 32.20 x 10.10mm: Its compact size makes it suitable for various applications where space efficiency is crucial.
  • Low Current Operation: Energy-efficient, beneficial for both battery-powered and low-power electronic devices.
  • Common Anode and Cathode Options: Offers flexibility in circuit design, accommodating various electronic configurations.
  • Excellent Character Appearance: Ensures digits are displayed clearly and legibly, enhancing readability.
  • High Light Output: Bright enough for easy reading under different lighting conditions.
  • Easy Mounting on PC Boards or Sockets: Designed for straightforward installation, facilitating efficient integration into electronic systems.
  • IC Compatible: Can be integrated with integrated circuits, suitable for complex electronic designs.
  • Multicolor Availability: Provides options for different colors, adding versatility in design and functional use.
  • Categorized for Luminous Intensity: Ensures consistent brightness levels across units, important for uniform display quality.
  • Technically Rugged: Durable and reliable, capable of withstanding various operational environments.
  • Standard Design: Gray Surface, White Segment: Offers a classic look with high contrast for ease of reading.
  • RoHS Compliance: Meets environmental standards, adhering to regulations that restrict hazardous substances.

Applications

  • Industrial Control Panels: Suitable for use in industrial environments where clear, multi-digit numeric displays are necessary for monitoring and control.
  • Public Information Displays: Ideal for transportation stations, public squares, or event venues where clear, multi-digit displays are needed.
  • Consumer Electronics: Appropriate for household appliances and entertainment systems requiring multiple numeric displays.
  • Telecommunication Equipment: Can be used in networking devices for displaying numerical information like channel numbers or signal strength.
  • Retail and Point of Sale Systems: Effective in displaying prices, quantities, or codes in retail environments.
  • Healthcare Equipment: Useful in medical devices for showing various numerical data such as patient vitals or timer settings.
  • Automotive Displays: Suitable for vehicle dashboards to display information like temperature, speed, or fuel levels.
  • Fitness Equipment: Ideal for gym machines, showing workout data such as time, speed, or calorie count.
  • Educational Tools: Used in educational settings for timers or displaying experiment data.
  • Safety and Emergency Equipment: Suitable for safety systems displaying critical numerical information.
Electrical-optical characteristics:
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Part No. (Cathode)
Part No. (Anode)
Emitting Color
Material
Peak Wavelength (nm)
Voltage typ.(v)
Voltage max. (v)
Luminous min
Luminous typ
BL-Q28I-41B
BL-Q28J-41B
ultra Blue
InGaN/SiC
470
4.2
60
90
BL-Q28I-41D
BL-Q28J-41D
Super Red
GaAlAs/DH
660
2.2
75
110
BL-Q28I-41E
BL-Q28J-41E
Orange
GaAsP/GaP
635
2.5
75
105
BL-Q28I-41G
BL-Q28J-41G
Green
GaP/GaP
570
2.5
80
110
BL-Q28I-41H
BL-Q28J-41H
Red
GaP/GaP
700
2.6
7.5
9.5
BL-Q28I-41PG
BL-Q28J-41PG
Ultra Pure Green
InGaN/SiC
525
4.2
120
190
BL-Q28I-41S
BL-Q28J-41S
Hi Red
GaAlAs/SH
660
2.2
75
95
BL-Q28I-41UB
BL-Q28J-41UB
ultra Blue
InGaN/SiC
470
4.2
75
120
BL-Q28I-41UE
BL-Q28J-41UE
Ultra Orange
AlGaInP
630
2.5
95
110
BL-Q28I-41UG
BL-Q28J-41UG
Ultra Green
AlGaInP
574
2.5
95
130
BL-Q28I-41UR
BL-Q28J-41UR
Ultra Red
GaAlAs/DDH
660
2.2
97
155
BL-Q28I-41UY
BL-Q28J-41UY
Ultra Yellow
AlGaInP
590
2.5
80
120
BL-Q28I-41W
BL-Q28J-41W
Ultra White
InGaN
-
4.2
140
BL-Q28I-41Y
BL-Q28J-41Y
Yellow
GaAsP/GaP
585
2.5
75
105
Package configuration & Internal circuit diagram
0.28 inch 4-digit seven segment led display


All dimensions are in millimeters(inches)
Tolerance is +-0.25(0.01″) unless otherwise note
Specifications are subject to change without notice.

Partno description:

LED seven segment , called also LED numeric display, is widely applied in home appliance panel display and other application.

Part No of Seven segment LED display

More information

Reflector Surface color (1st number)/ Segment Lens color (2nd number):

Number012345
Ref Surface ColorWhiteBlackGrayRedGreen 
Epoxy ColorWater clearWhite diffusedRed DiffusedGreen DiffusedYellow Diffused 

Absolute maximum ratings (Ta= 25°C)

Parameter SDUREYGUnit
Forward Current IF 252525252530mA
Power Dissipation Pd 606060606065mW
Reverse Voltage VR 555555V
Peak Forward Current IPF (Duty 1/10 @1KHZ) 150150150150150150mA
Operation Temperature TOPR-40 to +80°C
Storage Temperature TSTG-40 to +85°C
Lead Soldering Temperature TSOL  Max.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb)°C

Absolute maximum ratings (Ta= 25°C)

ParameterUHRUEYOUYUGPGUBUWUnit
Forward Current IF3030303030303030mA
Power Dissipation Pd7565656575110120120mW
Reverse Voltage VR55555555V
Peak Forward Current IPF (Duty 1/10 @1KHZ)150150150150150150100100mA
Operation Temperature TOPR-40 to +80°C
Storage Temperature TSTG-40 to +85°C
Lead Soldering Temperature TSOLMax.260+ 5°C for 3 sec Max. ( 1.6mm from the base of the epoxy bulb)°C
Related Information

Applied for:
dvd player radio train instrument refrigerator

1. Application
The Seven Segment LED is widely applied for ordinary electronic equipment (such as office equipment,
communication equipment and household applications). Checking with BETLUX’s Sales in
advance for information on applications in which exceptional reliability is required, particularly
when the failure or malfunction of the LEDs may directly jeopardize life or health (such as in
aviation, transportation, traffic control equipment, medical and life support systems and safety
devices).

2. Storage
The storage ambient for the Seven Segment LED should not exceed 30℃ temperature or 70% relative humidity.
For extended storage out of their original packaging, it is recommended that the Seven Segment LEDs be stored
in a sealed container with appropriate desiccant, or in a desiccator with nitrogen ambient.

3. Cleaning
Avoid using any unspecified chemical solvent to clean LED . For example, Trichloroethylene, Chlorosen, Acetone, and Diflon S3MC.
Any cleaning method can only be taken under normal temperature in one minute or less if it is required.
Use water to clean the Seven Segment LED if necessary under room temperature
dry it immediately after that.

4.Forming
Any unsuitable stress applied to the epoxy may break bonding wires in LED
Any forming on lead pin must be done before soldering, not during or after soldering.
Avoid applying any stress to resin in order to prevent the epoxy fracture and break on bonding wire.
While forming, please use a tie bar cut or equivalent to hold or bend the pin.
2mm from the base of resin is the minimum distance for the place bending the lead pin.
Avoid bending the lead pin at the same point twice or more.

seven segment display forming caution

Soldering

When soldering, leave a minimum of 2mm clearance from the base of the base of the lens to the soldering point. Dipping the lens into the solder must be avoided.

Do not apply any external stress to the lead frame during soldering while the LED is at high temperature.

Recommended soldering conditions:

 

IR Reflow Soldering (for SMD display)Wave SolderingSoldering Iron
Pre-Heat150-180°CPre-Heat100°C Max.Temperature300°C Max.
Pre-Heat Time120sec Max.Pre-Heat Time60sec Max.
Peak Temperature260°C Max.SolderWave260°C Max.Soldering Time3sec Max.(one time only)
Soldering Time10 sec Max.Soldering Time5sec Max.

Note: Excessive soldering temperature and/or time might result in deformation of the LED lens or failure of the LED

ESD(Electrostatic Discharge)

Static Electricity or power surge will damage the LED.

Suggestions to prevent ESD (Electrostatic Discharge):

n Use a conductive wrist band or anti-electrostatic glove when handling these LEDs

n All devices, equipment, and machinery must be properly grounded

n Work tables, storage racks, etc. should be properly grounded

n Use ion blower to neutralize the static charge which might have built up on surface of the LED’s

 plastic lens as a result of friction between LEDs during storage and handling

ESD-damaged LEDs will exhibit abnormal characteristics such as high reverse leakage current, 

low forward voltage, or “no light on” at low currents. To verify for ESD damage, check for “light on” 

and Vf of the suspect LEDs at low currents.

The Vf of “good” LEDs should be>2.0V@0.1mA for InGaN product and >1.4V@0.1mA for AlInGaP

 product.

antistatic notice-smd led

LED dirve IC by  Maxim Integrated

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 provide in-depth design and IC selection help for design engineers.  Each solution is dedicated to a popular end-equipment type and features design information, circuits and a block diagram.   Within a block diagram, click on a block to view best-fit integrated circuits recommended by Maxim engineers.

When selecting power for LED systems, it’s essential to understand several key parameters to ensure safe operation, longevity, and optimal performance. Here are some steps and considerations for LED power selection:

  • Determine the Forward Voltage (Vf) of the LED(s):

Each LED has a forward voltage, which is the voltage at which the LED operates when the current is flowing through it. This value can typically be found in the LED’s datasheet.

  • Determine the Forward Current (If) of the LED(s):

The forward current is the current at which the LED is designed to operate. Running an LED at higher than its rated current can reduce its lifespan and increase the heat it produces.

  • Decide on the Configuration:

Series Configuration: When LEDs are connected in series, the forward voltages add up, but the current remains the same.

Parallel Configuration: When LEDs are connected in parallel, the forward voltage remains the same, but the currents add up. This configuration can be risky because if one LED fails or has a slightly lower forward voltage, it can cause the other LEDs to draw more current.

Calculate Total Power Requirements:

Power (W) = Total Forward Voltage (V) x Total Forward Current (A)

For example, if you have three LEDs connected in series, each with a forward voltage of 3V and a forward current of 20mA, the total power requirement would be:

Power = (3V + 3V + 3V) x 20mA = 9V x 0.02A = 0.18W

  • Select an Appropriate Power Supply:
  • Voltage Rating: The power supply voltage should match or slightly exceed the total forward voltage of your LED configuration.
  • Current Rating: The power supply’s current rating should meet or exceed the total forward current of your LED configuration.
  • Safety Margin: It’s a good practice to select a power supply that can provide at least 20% more power than your calculated requirement. This ensures the power supply isn’t operating at its maximum capacity, which can extend its life and ensure safer operation.
  • Consider Additional Features:
  • Dimming Capability: If you want to control the brightness of your LEDs, choose a power supply with dimming capabilities.
  • Overcurrent and Overvoltage Protection: To protect your LEDs, select a power supply with built-in protection mechanisms.
  • Thermal Management: Ensure that the power supply has adequate cooling, especially if it will be enclosed or in a location with limited airflow.
  • Regulation and Efficiency:A power supply with good regulation will maintain a consistent voltage output despite variations in the load. High efficiency ensures minimal power is wasted as heat.
  • Physical Size and Form Factor:Depending on where you plan to place the power supply, its size and shape may be critical factors.

In summary, when selecting power for LED systems, understanding your LED’s requirements and the configuration you plan to use is essential. Then, pick a power supply that meets those needs with some added safety margin, keeping in mind any additional features or constraints relevant to your project.

Here are some well-regarded brands in the industry:

  • Mean Well: One of the most recognized brands in the LED power supply industry, Mean Well offers a wide range of products suitable for both indoor and outdoor applications. Their units often come with features like overcurrent protection, dimming capabilities, and high efficiency.
  • Tridonic: A global leader in lighting technology, Tridonic offers LED drivers and power supplies that cater to various lighting solutions, from simple setups to advanced smart lighting systems.
  • Philips Advance Xitanium: Philips is a well-known brand in the lighting industry, and their Xitanium series of LED drivers are known for reliability and performance. They cater to both indoor and outdoor LED applications.
  • Osram: Another giant in the lighting industry, Osram offers a range of LED drivers and power supplies suitable for various applications, including architectural and street lighting.
  • LIFUD: Specializing in LED drivers, LIFUD is known for its high-quality products that cater to both commercial and residential LED lighting solutions.
  • MOSO: This brand offers a variety of LED drivers, especially for outdoor and industrial applications. Their products are known for durability and performance.
  • TDK-Lambda: With a history in power electronics, TDK-Lambda offers a range of power supplies and LED drivers suitable for various applications, emphasizing reliability and advanced features.
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