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This section provides an overview for small signal diodes as well as their applications and principles. Also, please take a look at the list of 13 small signal diode manufacturers and their company rankings. Here are the top-ranked small signal diode companies as of June, 2025: 1.Won-Top Electronics Co., Ltd., 2.Sensitron Semiconductor, 3.Microsemi Corporation.
Table of Contents
A small signal diode is a diode that operates with a relatively small current of a few hundred mA or less.
They are used in rectification and switching to convert alternating current to direct current, and in the generation of constant voltage. The most well-known application is demodulation.
Demodulation is the process of combining a high-frequency carrier signal with a low-frequency audio signal and using the diode's ability to detect only the low-frequency signal to output the radio signal as an audio signal to an audio output device.
Small signal diodes are used in electronic products that handle small signals and perform electrical operations, especially in high-frequency applications such as electrical equipment, precision instruments, and radio receivers, as well as in switching operations.
When selecting a diode, the maximum rating and the bias that can be applied to the diode should be taken into consideration due to its small signal operation. If there is a possibility of excessive current flow, a protection circuit must be installed to prevent excessive current flow to the diode.
The principle of small signal diodes is based on a unique circuit operation that utilizes the rectifying effect that occurs in the forward and reverse directions of the I-V characteristics, using physical phenomena that occur at the PN junction interface of a semiconductor diode or at the junction interface between a metal and a semiconductor.
The operation of small electrical circuits is divided into their typical functions: switching operation, rectifier circuit, and constant voltage generation.
When voltage is applied to a diode, it is serves as a switch using its ability to allow current to flow in only one direction. When a voltage is applied in the forward direction, current flows, which is called the on-state operation, and in the reverse direction, current does not flow even if a voltage is applied, which is the off-state operation.
Schottky barrier diodes and PIN diodes are capable of high-speed switching at small currents, so they are used as diodes for the function of switches with relatively high operating frequencies.
Rectification is a circuit operation that converts alternating current to direct current by utilizing the diode's property of current flow in only one direction. Normally, the current is a half-frequency current that does not pass in the negative direction, but when diodes are connected in a bridge circuit, the negative portion of the AC current is converted to positive and energized, making it possible to convert the current into a full-frequency DC current.
This is a circuit operation in which a zener diode is often used. A zener diode is a diode that can generate a constant voltage over a certain range regardless of the reverse current. These diodes are used in circuits that generate constant voltages and are also used as protection circuits.
Small signal diode structures can be broadly classified into planar and mesa types.
Planar Type
The planar type is the most commonly used semiconductor structure, in which an impurity diffusion layer is formed near the oxide film on the silicon semiconductor surface to create a PN junction for the diode. This structure can be widely used as a circuit block inside an IC in addition to discrete small signal diodes.
Mesa Type
The mesa type has the feature of forming the PN junction in a vertical mountain-like shape, and in particular, the area of the N-type part can be made large due to its structure, enabling a relatively large reverse withstand voltage. This structure is often used in small signal diodes for rectification.
When small signal diodes are used in various circuits, multiple diodes may be used. Array-type small signal diodes are suitable in such cases.
Products that integrate multiple small signal diodes in a single package or, for example, a composite array of Zener diodes and Schottky barrier diodes, are also available. These products are useful when you want to use different Vf voltages for different diodes in a circuit.
*Including some distributors, etc.
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Diodes Incorporated is a supplier for the consumer electronics, computing, communications, industrial, and automotive markets. Diodes Incorporated designs, manufactures, and supplies application-specific standard products in the discrete, logic, analog, and mixed-signal semiconductor markets worldwide. It focuses on low pin count semiconductor devices. Diodes specializes in semiconductor products, such as MOSFET, TVS, and performance Schottky rectifiers, transient voltage suppressors and other devices. It also provides analog products, such as power management devices comprising AC-DC and DC-DC converters, signaling devices, CMOS devices, and analog switches. Diodes Incorporated was incorporated in 1959 and is headquartered in Plano, Texas.
Microsemi Corporation was founded in 1959 and is headquartered in Aliso Viejo, California. Microsemi is a subsidiary of Microchip Technology Incorporated. Microsemi is a provider of semiconductor and system solutions for aerospace, communications, data center, and industrial markets. A few of Microsemi’s product lines include high-performance and radiation-hardened analog mixed-signal integrated circuits, FPGAs, power management products, timing and synchronization devices, and RF solutions. Microsemi’s technological strengths are in connectivity, energy efficiency, miniaturization, power management, and security.
Vishay Intertechnology, Inc. (Vishay) was incorporated in 1962 and is headquartered in Malvern, Pennsylvania. The company serves the industrial, automotive, telecommunications, consumer products, and medical end markets and sells its products under numerous brand names inlcuding Siliconix, Draloric, Beyschlag, UltraSource, and Applied Thin-Film Products. The company manufactures and sells discrete semiconductors and passive electronic components in globally while operating in six market segments: MOSFETs, diodes, optoelectronic components, resistors, inductors, and capacitors.
Sensitron Semiconductor, founded in 1969 with corporate headquarters located in the USA, is a manufacturer of power electronic components and systems for the defense, aerospace, space, and medical markets. The company's products include high-power rectifier bridges, motion control modules, TVS modules, solid-state power controllers, and high voltage diode assemblies, as well as various services including, engineering, electrical and mechanical design, material science expertise, and testing of a finished power system. The company's facility includes a wafer fabrication clean room and a microelectronics manufacturing clean room.
Wuxi Xuyang Electronics Co., Ltd., founded in 2001 and based in Jiangsu, China, is a manufacturer of thermistor diodes, Zener diodes, transient voltage suppressor diodes, and DIAC trigger diodes. These electronic components are used for precision and stability, making them essential in various applications. Thermistor diodes are needed for their temperature-sensing capabilities, helping maintain optimal operating conditions in electronic devices. DIAC trigger diodes are essential for triggering and controlling the firing angle in electronic circuits. These components find applications across industries such as telecommunications, automotive, consumer electronics, and industrial automation.
Won-Top Electronics Co., Ltd., established in 1992 and based in Kaohsiung, Taiwan, is a manufacturer of diodes, bridge rectifiers, and protection devices. The company produces other products, such as power rectifiers, small signal-switching diodes, and protection devices. All these products are used in different applications, including automotive, lighting, communication, energy harvesting, and smart grip. The manufacturing facilities of the company are located in Shanghai and Shandong. There are around 9 billion devices produced and supplied to customers in America, Asia, Europe, and the Middle East regions.
Topdiode Manufacturing Company Limited is a manufacturer and supplier of multilayer ceramic chip capacitors (MLCCs) and diodes. Established in 1995, the company is headquartered in Changping, Dongguan, Guangdong, China. Its main activities encompass the design, production, and distribution of MLCCs and diodes such as Ceramic capacitors, Tantalum capacitors, Varistors, Aluminum Electrolytic capacitors, and Film capacitors. Topdiode specializes in electronic components that are essential in various industries, including telecommunications, automotive, and consumer electronics. Topdiode Manufacturing Company Limited offers comprehensive services such as technical support and custom solutions.
Jinan Jingheng Electronics Co., Ltd. is a manufacturer and supplier of electronic components. Established in 1958, the company is based in Jinan, Shandong, China. The company's main activities involve designing, manufacturing, and supplying a diverse range of electronic components, including resistors, capacitors, and inductors. Its diodes products such as Low Vf Schottky, Schottky Barrier Rectifier, SIC Schottky, General Purpose Rectifier and Fast Recovery Rectifier cater to industries such as electronics manufacturing and telecommunications. Jinan Jingheng Electronics offers services like technical support and customized component solutions to customers, such as Ge, Philips, Osram, Panasonic, Samsung, Foxconn, Bosh.
Diotec Semiconductor AG is a German-based semiconductor manufacturer and supplier of diodes and rectifiers which was founded in 1973 and is headquartered in Heitersheim, Germany. They specialize in producing discrete semiconductors, both standard and customized, readily available for worldwide delivery. Their product portfolio includes diodes, rectifiers, protection devices (TVS/ESD), transistors, and regulators. These products are used in various applications such as in industrial, energy, mobility, lighting, and consumer electronics, contributing to power management, signal conditioning, and circuit protection in different electronic systems and devices.
Changzhou Trustec Co. Ltd., established in 2011, is a Chinese manufacturer and supplier of semiconductor discrete devices based in Changzhou, Jiangsu. The company's product range includes axial and surface-mounted diodes, rectifier diodes, as well as featured products such as fast recovery diodes, transient voltage suppressor diodes, and bridge rectifier diodes. These products have applications in automotive, green lighting, household appliances, power supplies, and chargers. The company follows ISO/TS 16949:2009 for its quality management standards.
HVP High Voltage Products GmbH, established in 2005, is a German supplier headquartered in Martinsried, Munich, specializing in high voltage, low voltage, high power, high frequency, as well as test and measurement components. Among its notable offerings, the company provides various high voltage products, including high voltage amplifiers, capacitor stacks, power supplies, probes, and quick connectors. It also features other products such as axial lead diodes, daytime corona discharge cameras, Klystron modulators, low voltage power supplies, and Marx generators. These products find applications in various sectors and industries, including data centers, electrical utilities, heavy industries, high voltage laboratories, and high-speed electrical trains.
Ranking as of June 2025
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | Sensitron Semiconductor |
23.1%
|
| 2 | Won-Top Electronics Co., Ltd. |
15.4%
|
| 3 | HVP High Voltage Products GmbH. |
15.4%
|
| 4 | Microsemi Corporation |
15.4%
|
| 5 | Diodes Incorporated |
15.4%
|
| 6 | Wuxi Xuyang Electronics Co., Ltd. |
7.7%
|
| 7 | Vishay Intertechnology, Inc., |
7.7%
|
Derivation Method
The ranking is calculated based on the click share within the small signal diode page as of June 2025. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
4 | 33.3% |
|
China
|
4 | 33.3% |
|
Germany
|
2 | 16.7% |
|
Taiwan
|
1 | 8.3% |
Switzerland
|
1 | 8.3% |
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