Utmel Blog Author

UTMEL

We are the professional distributor of electronic components, providing a large variety of products to save you a lot of time, effort, and cost with our efficient self-customized service. careful order preparation fast delivery service

Sort by

What are Laser Diodes?
20 October 2025
Laser diodes include single heterojunction (SH), double heterojunction (DH), and quantum well (QW) laser diodes. The quantum well laser diode has the advantages of low threshold current and high output power, which is the mainstream product in the market. Compared with optical maser, laser diodes have the advantages of high efficiency, small size, and long life, but their output power is small (generally less than 2mW), linearity and monochromaticity are poor, limiting their applications in cable television systems for not able to transmit multi-channel, high-performance analog signals. In the feedback module of the bidirectional optical receiver, the uplink transmission generally uses a quantum well laser diode as a light source.
An Overview of Top Semiconductor Companies
17 October 2025
The widespread use of semiconductors has changed our way of life. With the proliferation of electronic equipment, companies manufacturing semiconductors are booming.
Characteristics, Types, and Functions of Electrolytic Capacitors
17 October 2025
Inside the electrolytic capacitor is an electrolyte material that stores electric charge. It has positive and negative polarity, which is similar to a battery, and it cannot be reversed. The positive electrode is a metal substrate with an oxide film. The negative electrode is connected to the electrolyte (solid and non-solid) through the metal electrode plate.
Introduction to Semiconductor Devices
17 October 2025
Semiconductor devices are electronic devices with conductivity between a good conductor and an insulator. It uses the special electrical characteristics of semiconductor materials to accomplish specific functions such as generate, control, receive, transform, and amplify signals, and convert energy.
Understanding of Carbon Film Resistors
17 October 2025
A carbon film resistor is a type of film resistor, which is also called thermal decomposition carbon film resistor. It’s a thin-film resistor in which the carbon that is thermally decomposed from a hydrocarbon at high temperatures is deposited on a substrate. It adopts high-temperature vacuum coating technology to tightly attach carbon to the surface of a porcelain rod to form a carbon film, and coats the surface with an epoxy resin to protect the film. Its surface is often coated with green protective paint. The thickness of the carbon film determines the resistance value. And usually, the thickness of the film and the groove are used to control the resistor. Besides, it has a low price, stable performance, a wide range of resistance and power.
Basic Introduction to the Types of Capacitors
16 October 2025
A variety of capacitors are used in the manufacture of electronic devices, and they play different roles in the circuit. There are many types of capacitors, such as fixed capacitors, variable capacitors, and trimmer capacitors, and fixed capacitors can be divided into ceramics, mica, paper, film, and electrolytic capacitors according to the different dielectric.
How to read Resistors Color Code?
16 October 2025
We can read the resistance value according to the resistors color code because of the use of four color bands or five color bands or six color bands on the resistors to indicate the resistance value. The color information representing the resistance value can be read at once from any angle.
Photoresistor Basics: Types, Principles and Applications
16 October 2025
The article introduces the photoresistor’s main characteristics and principles including the working principle and structural principle. There are three types of photoresistor: ultraviolet photoresistors, infrared photoresistors, visible light photoresistors. Dimming circuit and light switch are the two applications of the photoresistor.
A Guide to AVR Microcontroller [PDF]
15 October 2025
AVR microcontroller is an enhanced RISC (Reduced Instruction Set CPU) high-speed 8-bit microcontroller with built-in Flash developed by ATMEL in 1997.
The Introduction to QFN Package
15 October 2025
Hello everyone, I am Rose. Today I will introduce QFN Package to you. QFN (Quad Flat No-leads Package), one of the surface-mount packages.QFN package does not have any extension pins at all.
Neural Processing Unit (NPU) Explained
15 October 2025
Neural Network Processing Unit (NPU) adopts a “data-driven parallel computing” architecture, which is particularly good at processing large-scale multimedia data such as video and images. This paper analyzes the working principle, architectural features, differences with CPU/GPU, and application scenarios of NPU in modern smart devices.
What is Inertial Measurement Unit (IMU)?
15 October 2025
An inertial measurement unit (IMU) is a device that measures three-dimensional linear and angular motion without an external reference, i.e., a device that measures the three-axis attitude angle (or angular rate) and acceleration of an object.