How to distinguish the positive and negative poles of SMD LED lamp beads


Many packages, like some 0603, 0805 and other SMD LEDs, will have a green "T" symbol on the bottom. One horizontal side of the "T" is the positive pole, and the other side is the negative pole. Some SMD LEDs will be marked with a silk screen similar to a triangle symbol, so the bottom side of the triangle is close to the positive pole, and the top corner is close to the negative pole. The lead of the light-emitting diode is generally longer at the anode and shorter at the cathode. Observe the shape of the two lead wires inside the tube from the side, the smaller one is the positive electrode, and the larger one is the negative electrode. Set the multimeter to the “ohm x1” position. When the diode is emitting light, the red test lead is connected to the positive end of the SMDLED, and the black test lead is connected to the negative end of the SMDLED. Because the LED turn-on threshold is about 1.5-1.8V. It is possible that the voltage provided by the digital multimeter cannot start it. So still look at the mark. SMD LEDs have a green dot as the negative electrode and the opposite one as the positive electrode.

Related News


Illuminate Your Space with 1W SMD LED Technology

# Introduction In today's fast-paced world, finding the perfect lighting solution for your space is essential. Whether you're looking to illuminate your home, office, or outdoor area, 1W SMD LED technology offers a versatile and cost-effective option. In this article, we will explore the benefits of 1W SMD LED technology and how it can enhance your environment. ## What is 1W SMD LED Technology? 1W


All You Need to Know About SMD LED 3V for Lighting Applications

SMD LED 3V, also known as Surface Mount Device Light Emitting Diode with a voltage rating of 3 volts, is a popular type of LED used in various lighting applications. These compact and energy-efficient LEDs have revolutionized the field of lighting, offering a wide range of benefits and applications in LED packaging components, particularly in surface mount technology. One of the key features of SM


Illuminate Your Space with Energy-Efficient SMD 3014 LED Chips

# Introduction In today's fast-paced world, energy efficiency is more important than ever. With the rising costs of electricity and the increasing awareness of environmental issues, finding ways to reduce energy consumption has become a top priority for many individuals and businesses. One way to achieve this goal is by utilizing energy-efficient lighting solutions such as SMD 3014 LED chips. In t


Unleashing the Power of High Power SMD LED in Lighting Industry

High power SMD LED, also known as surface-mount device light-emitting diode, are cutting-edge components that are reshaping the landscape of the lighting industry. These tiny yet powerful devices have opened up a world of possibilities for designers and manufacturers, offering a high level of efficiency and versatility in various lighting applications. One of the key advantages of high power SMD L


Unleashing the Brightness: A Guide to SMD LED PCBs

**Introduction** In the world of lighting technology, SMD LED PCBs have revolutionized the way we illuminate our spaces. These compact and energy-efficient components offer unparalleled brightness and versatility, making them the go-to choice for a wide range of lighting applications. In this guide, we will delve deep into the world of SMD LED PCBs, exploring their construction, benefits, and best