Beatrice Lang
Basic electronic components are identified by manufacturer part numbers (MPN) and distributor/vendor part numbers (VPN). Each component also has a datasheet that explains its performance, specifications, and features. While electronic components are mostly industrial products available in singular form, they should not be confused with electrical elements, which are conceptual abstractions of idealized components. Electronic components are physical entities within an electronic system that are designed to affect electron flow or electron control. They are the fundamental units of electronic circuits, each serving a specific purpose in facilitating the flow of electric current.
| Characteristics | Values |
|---|---|
| Number of terminals | 2 or more |
| Function | E.g. Store and release electrical energy, control flow of electricity, affect electron flow or electron control |
| Abbreviation | E.g. C, L |
| Unit | E.g. Farad (F), Henry (H) |
| Typical values | E.g. 1pF to 1000uF, 1 µH to 2000 mH |
| Type | Passive, active, or electromechanical |
| Datasheet | Explains performance, features, and specifications |
| Manufacturer part number | E.g. 100-ohm resistor |
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What You'll Learn
Identify the type of component
Identifying the type of electrical component is a crucial step in the designing, assembling, deployment, troubleshooting, and repairing stages of the PCB production process. There are several methods and tools that can be used to identify the type of electrical component:
Visual Inspection
The first step is to visually examine the component to identify its physical characteristics. This includes observing the shape, size, colour bands, and any markings or codes printed on the component's body. These markings often indicate specifications such as capacitance, voltage rating, tolerance, and polarity. For example, resistors are identified by their colour bands or numerical codes, while capacitors may have alphanumeric codes specifying their capacitance, voltage rating, and tolerance.
Measurement Tools
In some cases, direct measurement of component parameters is necessary for identification. Tools such as a multimeter, LCR meter, or component identifier can provide precise measurements of resistance, capacitance, inductance, and other characteristics. These measurements can help distinguish between similar components with different values.
Manufacturer Part Numbers
Basic electronic components are often identified by their manufacturer part numbers (MPN) or distributor/vendor part numbers (VPN). These part numbers are usually printed on the component's body and can be used to look up additional information about the component, such as its datasheet.
Datasheets
A datasheet is a technical document that provides detailed information about an electronic component's specifications, characteristics, and performance. It includes parameters such as physical dimensions, electrical characteristics, and functional capabilities. By referencing the datasheet, you can confirm the type of component and ensure it meets the requirements of your application.
Electronic Component Identification Charts
These charts are visual reference tools used by engineers, technicians, and hobbyists to identify electronic components based on their physical appearance, markings, and specifications. They typically include illustrations or photographs of common electronic components along with relevant information, making it easier to identify the component by sight.
Experience and Practice
Perfecting the art of identifying electrical components requires time and experience. As you work with various PCBs and components, you will naturally develop the ability to recognize and differentiate between different types of components. Practice and familiarity with different components will enhance your identification skills over time.
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Understand its function
Understanding the function of an electrical component is pivotal for anyone delving into the realm of electronics. Electrical components are the building blocks of every electronic device, from simple calculators to advanced computers. They are the fundamental units of electronic circuits, each serving a specific purpose in facilitating the flow of electric current.
Passive components, such as resistors, capacitors, inductors, transformers, and more, form the backbone of electronic circuitry. They do not require an external power source to operate and primarily work to control, store, or dissipate electric energy. Resistors, for example, are passive two-terminal electrical components that limit the flow of electric current and provide specific resistance values in circuits. Capacitors, on the other hand, store electrical energy and deliver it to the circuit when needed, playing a crucial role in filtering, smoothing, and regulating voltage. Inductors, also known as coils or chokes, store energy in a magnetic field when a current flows through them and are used for energy storage, filtering, and impedance matching.
Active components, such as transistors, integrated circuits (ICs), and diodes, require an external power source for their operation. Transistors, for instance, are semiconductor devices used for amplification, switching, and signal modulation in electronic circuits. They offer high input resistance and low output resistance. ICs are miniature electronic circuits built on semiconductor wafers, usually made of silicon, and containing millions of interconnected transistors, resistors, and capacitors. They perform specific functions such as data processing and signal processing. Diodes, another type of semiconductor device, allow current to flow in one direction while blocking it in the opposite direction, making them useful for rectification, signal demodulation, and voltage regulation.
By understanding the functions of these electrical components, individuals can gain insight into the inner workings of modern technology and explore innovative applications.
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Know the number of terminals
When creating a name for an electrical part, it is important to know the number of terminals it has. A terminal is the point at which a conductor from a component, device, or network comes to an end. It is also referred to as an electrical connector that acts as a reusable interface for a conductor, creating a point where external circuits can be connected. Most electrical components have two or more terminals (leads or pins). These terminals are used to solder the components onto electronic circuit boards or for wire connections.
The number of terminals that a part has is crucial information for naming and using the part correctly. For example, resistors, which are used to divide a voltage into a smaller voltage, have two terminals. Variable resistors have an additional arrow laid diagonally across the middle, but they remain two-terminal devices. On the other hand, potentiometers are three-terminal devices, with the arrow serving as the third terminal.
In addition to resistors, capacitors are another common electrical component. Electrolytic capacitors have a high capacitance and are polarised, meaning they have a positive and negative lead. The negative lead is marked and shorter and must be connected to the negative voltage. Ceramic and Mylar capacitors have lower capacitance values than electrolytic ones and are often much smaller, with a capacitance code instead of a specific value.
Terminals themselves also come in various types, each with unique features and applications. For example, butt connectors are cylindrical terminals that join two wires end-to-end, while pin terminals are pin-shaped and easily inserted into terminal blocks or connectors. Quick-disconnect terminals are used in settings where rapid disassembly of components is necessary, such as in control systems, machinery, and consumer electronics. Wire nuts, small twist-on caps with an internal metal coil, are widely used electrical connectors that can securely connect multiple wires.
In summary, knowing the number of terminals an electrical part has is essential for naming and using the part correctly. Electrical parts with different numbers of terminals serve distinct functions and have unique names. Additionally, the type of terminals the part uses can vary, each with its own advantages and applications.
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Abbreviate where possible
When creating electrical part names, it is important to use abbreviations where possible to keep the name concise and easy to use. Abbreviations are commonly used in schematics, datasheets, and technical documentation related to electronic components.
For example, the following are common electrical components and their abbreviations:
- Resistors (R) are passive two-terminal electrical components that limit the flow of electric current.
- Capacitors (C) store and release electrical energy in the form of an electric field.
- Inductors (L) are also known as coils or chokes, and they store energy in a magnetic field when a current flows through them.
- Diodes are semiconductor devices that allow current to flow in one direction and are commonly denoted as D.
- Transistors (T) are semiconductor devices used for amplification and switching.
Additionally, some specific types of diodes and transistors have their own abbreviations, such as the Zener diode (ZD) and the Silicon-Controlled Rectifier (SCR).
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Include manufacturer and distributor details
When creating a naming system for electrical parts, it is important to consider including manufacturer and distributor details. This can be done in a few ways:
Firstly, you can use a manufacturer or vendor-specific naming convention. This involves using the manufacturer or vendor's naming convention for their electrical parts. For example, a manufacturer may use a code such as "GE" for General Electric, followed by a unique identifier for each part. This method can be helpful if the manufacturer's or vendor's naming convention is well-known and recognised within the industry. It also provides additional information about the part.
Secondly, each basic electronic component is typically identified by a manufacturer part number (MPN). This is a unique part number that the manufacturer assigns to a specific component with particular specifications in its catalogue. For instance, a manufacturer may assign the MPN "CRT0805-DY-1R00ELF" to a specific 1-Ohm resistor they produce. This MPN can then be referenced by distributors and suppliers.
In addition to the MPN, distributors and suppliers usually assign their own distributor or vendor part number (VPN). This number is specific to the distributor or supplier and may include information about the packing of the components, such as part reel or full reel. For example, a distributor may assign the VPN "CRT0805-DY-1R00ELF-ND" to the resistor manufactured by Bourns Inc. with the MPN "CRT0805-DY-1R00ELF".
Furthermore, when creating a bill of materials (BOM), which is a list of specific parts and sub-assemblies required to assemble a product, it is important to include the manufacturer and distributor details for each part. This ensures that the correct parts are sourced and purchased from the appropriate suppliers. The BOM is used to obtain quotations, purchase materials, and assemble the product, so accurate and up-to-date manufacturer and distributor information is crucial.
Finally, when establishing a naming convention for electrical parts, consider using sequential numbering. This involves assigning a unique number to each part in sequential order, such as "E-001", "E-002", "E-003", and so on. This method provides clear and consistent identification for each part, which can improve communication and maintenance processes.
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Frequently asked questions
Some commonly used electronic components include resistors, capacitors, diodes, transistors, and integrated circuits.
Basic electronic components are identified with their respective manufacturer part numbers (MPN) and distributor/vendor part number (VPN).
Passive components include two-terminal components such as resistors, capacitors, inductors, and transformers.
Active components include amplifying components such as transistors, triode vacuum tubes (valves), and tunnel diodes.
