Overview
The LED2121 LED bead is a surface-mount device (SMD) or through-hole LED widely used in electronic circuits for indication and illumination purposes. It is characterized by its small size, typically measuring 2.1mm x 2.1mm, and operates at low voltage and current, making it energy-efficient. These LEDs are available in various colors, including red, green, blue, yellow, and white, with brightness levels suited for different applications. They are commonly found in consumer electronics, automotive dashboards, and industrial control panels due to their reliability and longevity.
Structure and Working Principle
The LED2121 consists of a semiconductor chip encased in a epoxy resin lens, which protects the chip and focuses the emitted light. The chip is made of materials like gallium arsenide (GaAs) or gallium phosphide (GaP), depending on the desired color and efficiency. When a forward voltage is applied, electrons recombine with electron holes within the semiconductor, releasing energy in the form of photons (light). The wavelength (color) of the light depends on the energy bandgap of the semiconductor material used.
Key Features
The LED2121 offers several advantages, including low power consumption (typically 20mA at 2-3.5V), high brightness (ranging from hundreds to thousands of millicandelas), and a lifespan exceeding 50,000 hours. Its compact size allows for high-density PCB layouts. Additionally, it has a fast response time (nanoseconds), making it suitable for dynamic lighting effects and communication devices. The LED is also environmentally friendly, as it contains no mercury or other hazardous materials.
Application Areas
The LED2121 is versatile and used in numerous applications. In consumer electronics, it serves as power indicators, backlights for LCDs, and status lights in appliances. Automotive uses include dashboard lighting, interior mood lighting, and exterior signal lights. Industrial applications include control panel indicators, machinery status lights, and safety signage. Its low heat emission and energy efficiency make it ideal for battery-operated devices like remote controls and portable gadgets.
Maintenance and Precautions
To ensure optimal performance, avoid exceeding the maximum forward current (typically 20-30mA) to prevent overheating and premature failure. Use current-limiting resistors in series with the LED to regulate the current. Store LEDs in anti-static packaging to prevent damage from electrostatic discharge (ESD). When soldering, keep the temperature below 260°C and limit exposure time to avoid damaging the epoxy lens. Avoid mechanical stress during handling and installation.
B2B Procurement Guide
When purchasing LED2121 beads in bulk, verify the supplier's certifications (e.g., RoHS, ISO) to ensure quality and compliance. Request samples to test brightness, color consistency, and soldering performance. Compare datasheets for key parameters like forward voltage, luminous intensity, and viewing angle. Negotiate pricing based on order volume, with discounts typically available for quantities above 10,000 units. Consider lead time and logistics for just-in-time inventory management.
Related Manufacturers
- 主营：强力巨彩LED显示屏、海佳彩亮LED显示屏、P2.5全彩屏、大华丰视led显示屏、蓝普led显示屏、高科led显示屏、直播间led显示屏、会议室led显示屏、宴会厅led显示屏、舞台led显示屏、P3全彩LED显示屏、P4LED电子显示屏、P2全彩LED显示屏、P1.86LED显示屏、酒吧LED显示屏、会议室LED显示屏、直播间LED显示屏
- 主营：2835灯珠、3528灯珠、5050灯珠、4014灯珠、3014灯珠、5730灯珠、rgb灯珠、仿流明灯珠、插件灯珠、草帽灯珠、红外灯珠、3535灯珠
- 主营：2835灯珠、3030灯珠、5630灯珠、3535灯珠、2016灯珠、5054灯珠、5050灯珠、直插灯珠、三星灯珠、欧司朗灯珠、飞利浦灯珠、科锐灯珠、首尔灯珠、COB光源、红外发射管
- 主营：2016灯珠、2525灯珠、2835灯珠、3014灯珠、3020灯珠、3433灯珠、4014灯珠、3535灯珠、3030灯珠、5050灯珠、5630灯珠、5730灯珠、5074灯珠
- 主营：led路灯、led太阳能灯、市电路灯
- 主营：波形护栏、太阳能道盯、隧道反光环、6颗灯珠、水泥桩、滚筒护栏、反光膜、玻璃钢柱帽、轮廓标、光伏螺栓、钢管警示桩、桥梁护栏、防眩板、防撞垫、伸缩护栏
- 主营：tlc274cdr、模块mos、易龙泰、chip1stop、缓冲器、衰减器、放大器、制pcb板、传感器、国内pcb、多层pcb、25svpf47m、逆变器、样板pcb、泰科源、博思达、稳压器、北高智、蓝伯科、机器人、变压器、控制器、smt贴片、阻抗fpc、整流管
- 主营：芯片、集成IC、TI、ST、NXP、ADI、tlc354cpw、b3u-1000p、衰减器、pcb批量、a991-2015、a999-3283、多层板、b140af-13、a999-3530、733910070、放大器、a999-3323、2474r-25l、制pcb板、国内pcb、多层pcb、逆变器
- 主营：防爆pad、防爆照相、防爆红外
- 主营：LED灯珠、贴片灯珠、UVC灯珠、UVB灯珠、UVA灯珠、紫光灯珠、蓝光灯珠、绿光灯珠、红光灯珠、深红光灯珠、红外光灯珠、激光灯珠、VCSEL灯珠、美容灯珠、3014灯珠、3020灯珠、2835灯珠、3528灯珠、3535灯珠、5050灯珠、5054灯珠、植物照明灯珠、RGB灯珠、深紫外LED
- 主营：LED发光二极管、红外发射接收管、4040蓝光LED灯、贴片LED灯珠、led直插灯珠、陶瓷LED灯珠、LED贴片灯珠、红绿双色LED灯珠、3020柠檬黄灯珠、3020全色系灯珠、1206红光灯珠、3528RGB灯珠、白光贴片led灯珠、双色LED灯珠、侧面发白光LED灯珠、3224红光灯珠、七彩黑面灯珠、侧面发光灯珠、3020蓝光灯珠、三色LED灯珠、侧发光LED灯珠、5050白光LED灯、5054白灯、发光二极管、5054RGB球头
- 主营：安防设备光源
- 主营：晶元芯片、日落灯光源、发光二极管、led灯珠、smd灯珠、直插灯珠、无极灯珠、贴片灯珠、冷白灯珠、平头灯珠、大功率led、smd3535灯珠、大功率灯珠、大功率仿流明、氛围灯光源板
- 主营：反光漆、热熔标线、热熔涂料、反光涂料、反光油漆、道路划线漆、马路划线漆、反光标记漆、公路标线施工、安全警示标记漆
- 主营：太阳能路灯、太阳能路灯维修、路灯、庭院灯、太阳能庭院灯、太阳能路灯配件、路灯灯头、太阳能景观灯、市电互补太阳能路灯、路灯杆、高杆灯、一体太阳能路灯、农村太阳能路灯、市政工程路灯、太阳能路灯维修灯头
- 主营：继电器、ir中国授权、频率合成器、ad8532ar放大器、ad828arz放大器、ad829jrz放大器、ad818arz放大器、ad8031arz放大器、ad8058arz放大器、ad8532arz放大器、ad8001arz放大器、ad8307arz放大器、ad8651armz放大器、ad8099ardz放大器、ad8534aruz放大器、ad706jr通用运放、op42gsz精密运放、op90gpz通用运放、ad8417brmz放大器、op07csz精密运放、ad712jrz精密运放、hmc326ms8ge放大器、op490gsz通用运放、op162gsz精密运放、ad848jrz通用运放
- 主营：玻璃吸盘、刮板机、支柱、绞车、传感器、喷浆机、喷涂机、拆缸机、柴油机水泵、乳化液泵站、氢氧化钙、订扣机、液压扳手、真空泵、滑移装载机、电缆夹板、闸瓦、滤液泵、试验台、装载机、气动绞车、变压器、移动变电站
- 主营：减速带、橡胶减速带、瓦斯钉、爆闪灯、仿真警车、可移动红绿灯、警示柱、轮廓标、市政护栏、凸面镜、箭头灯、高水马、黄闪红慢、防撞垫、膨胀螺丝、警示灯、减速带钉、防撞桶、隔离墩、警戒线、标志牌、广角镜、草坪护栏、橡胶护角、防眩板