The basics of PCB resistor : understanding what they are and how they work

The-basics-of-PCB-resistor

Electronic devices have become a huge part of our lives. It will help us to input or output information. But if you use the wrong lead, then you may cause damage to your device. PCB resistor is a very important element on your PCB board and it should be selected wisely. 

PCB resistor are passive components that are used to control the flow of electric current in a printed circuit board (PCB) by providing resistance to the flow of current. They are typically made of materials such as carbon, metal, or metal-alloy film, and are available in various sizes, shapes, and resistance values. They are used in a wide range of electronic devices, including smartphones, computers, and consumer electronics.

It has three main functions: protect the circuit, reduce excessive heat caused by high-power components, and limit current flow by limiting the voltage.

Table of Contents
    Add a header to begin generating the table of contents

    What is a PCB resistor

    PCB resistor is a device that converts electrical energy into heat. It has two terminals, one of which is connected to the positive side of the circuit, and the other is connected to the ground. When you apply a voltage across it, current flows through it and causes some amount of heat to be produced in proportion to that voltage difference.

    The purpose of using PCB resistor is primarily to limit current flow by dissipating its heat across their resistive value rather than allowing it to go straight into heating your components or causing them damage through overheating.

    The function of PCB resistor

    The main function of a PCB resistor is to control the flow of electric current in a circuit. This means that they help to regulate the voltage and current levels in a circuit, preventing damage to sensitive components.

    Common applications of PCB resistor include: Limiting current flow in a circuit; Dividing voltage levels in a circuit; Setting reference voltages; Protecting sensitive components from over-voltage or over-current; Providing bias voltage to active components; Filtering electronic signals to remove unwanted noise; Balancing circuit impedance.

    PCB resistor come in many different shapes and sizes, depending on what type of application you’re looking for them to perform. They may be flat-wound-like wire or stranded wires made up of many strands twisted together; they may also be cylindrical rods covered with insulation while still being rigid enough not to bend under pressure from another component such as capacitors/diodes/etc.

    Different types of PCB resistor

    There are many different types of PCB resistor. The most common ones are:
    1. Fixed Resistors
    Fixed resistors are the most common type of resistor on a PCB. Fixed resistors are typically made of carbon composition, and may be either metal or ceramic, depending on the purpose of the fixed resistor. 

    2. Carbon Composition Resistors
    Carbon composition resistors are popular because they are easily available and commonly used in projects that require high resistance values.

    3. Wire-wound Resistors

    Wire-wound Resistors
    Wire-wound resistors are similar to carbon-composition ones – they are available at most local electronics stores, but tend to cost more than carbon-composition ones do. Wire-wound resistors are designed to be relatively accurate and reliable. The typical value for the tolerance of the resistance value is 0.1% or better, while the temperature coefficient of resistance is typically about 5 ppm/°C. 

    4. Thin Film Resistor
    Thin film resistors are made from a layer of film that is so thin that it can be seen with the naked eye. It is commonly used in analog circuits. Also, it requires more voltage to drive other types of resistors but it can be more accurate than other types of resistors.

    5. Thick Film Resistor
    Thick film resistors have the same composition as thin film resistors. The only real difference is the thickness of their resistive elements, which are typically a few microns thick. This allows them to handle higher power dissipation and allow for more compact designs than their thinner counterparts.

    6. Fusible Resistors
    Fusible resistors are made from a material that melts at a high enough temperature; this allows them to be welding  together into a single component before they melt completely, making them very reliable in applications where reliability is critical.

    7. Ceramic Resistors
    These are ceramic components that use a small amount of current to control voltage within circuits without any moving parts. They tend to be more expensive than other types but offer better performance over long periods due to their high reliability and stability.

    The application of PCB resistor

    PCB resistor are used in a wide range of electronic devices and applications due to their versatility and reliability. They play an essential role in ensuring the proper functioning and stability of electronic circuits, but they’re also used in a wide range of other applications.

    ● Power Supplies
    ● Consumer Electronics
    ● Automotive Electronics

    Medical Equipment

    ● Medical Equipment
    ● Industrial Controls
    ● Communication Devices
    ● Military and Aerospace

    These are just a few examples of the wide range of applications for PCB resistor. They are an essential component in many electronic devices and play a critical role in ensuring the proper functioning and stability of electronic circuits.

    How to identify the resistor on the PCB board

    The most common method of identifying a PCB resistor is using a multimeter.
    The most common way to identify a resistor on the PCB board is to use a multimeter. When do PCBA testing the jumper wire that connects to the resistor, you may need to adjust the multimeter’s dials so that it displays 0V—the normal operating range of the meter. Some meters have indicators that tell you whether the meter is displaying an accurate reading or not, so be sure to check these if needed as well.

    How to test PCB resistors

    To check a resistor’s value, use a multimeter.The multimeter can be used without any special knowledge or tools, but it’s important to note that the reading may vary depending on your meter and its settings. 

    You can also test resistors by using a PCB breadboard instead of a hands-on approach. First, cut a piece of wire long enough to reach from one end of your resistor to the other. Next, strip the ends of both wires and insert them into the breadboard. 

    Now place a couple of drops of water on each lead and let it run down into the holes in the board. The wires will be connected to the resistor and ground, respectively. Next, place a voltmeter between the two wires to test whether or not electricity is flowing through them and into the water. If it is working correctly, your meter should read 0 volts (or very close to it).

    How to select a proper PCB resistor

    How to select a proper PCB resistor

    The most important parameter to consider when selecting a proper PCB resistor is the power rating (Watts) and tolerance (percentage).

    A lower-power resistor has a lower temperature coefficient of resistance than a higher-power resistor. This means that it will dissipate less heat, and therefore be more stable at high temperatures.

    To select a proper PCB resistor, you need to know the following parameters:
    ● The power rating (Watts) and tolerance (percentage).
    ● The temperature coefficient of resistance.
    ● Operating voltage range.

    How to understand PCB resistor code

    Resistors have three- or four-digit codes that identify the resistance and tolerance of the resistor. This method of marking resistors is called the PCB resistor code.

    Three-digit codes consist of three digits, with the first digit indicating the value of the resistance in ohms, and the second digit indicating the tolerance.

    Four-digit codes consist of four digits—one for each digit in the three-digit code. The first two digits are always zero—they specify that this resistor has no tolerance or specification. The last two digits are always one—they specify that this resistor has a specification between 1% and 10%. 

    The EIA-96 scheme is another common type of PCB resistor code used by manufacturers.
    The first two digits indicate the value of the resistor.
    The third digit indicates tolerance.
    The fourth digit indicates the temperature coefficient of the material.

    Conclusion

    PCB resistor is an electronic component that can be used to limit current or voltage in an electrical circuit

    PCB resistor is an electronic component that can be used to limit current or voltage in an electrical circuit. It is used to control the flow of current in a circuit.

    If you require a new PCB, then it is always recommended to purchase from a reputed manufacturer. This will ensure that your board has the right components and specifications. 

    You can identify your board with the help of a resistor or use a multimeter. The idea behind all this is to provide you with more confidence when it comes down to making purchases for electronic devices like computer CPUs, motherboards, etc.

    FAQ

    PCB resistor is a device that converts electrical energy into heat. It has two terminals, one of which is connected to the positive side of the circuit, and the other is connected to the ground. When you apply a voltage across it, current flows through it and causes some amount of heat to be produced in proportion to that voltage difference.
    The purpose of using PCB resistor is primarily to limit current flow by dissipating its heat across their resistive value rather than allowing it to go straight into heating your components or causing them damage through overheating.

    The most important parameter to consider when selecting a proper PCB resistor is the power rating (Watts) and tolerance (percentage).
    A lower-power resistor has a lower temperature coefficient of resistance than a higher-power resistor. This means that it will dissipate less heat, and therefore be more stable at high temperatures.
    To select a proper PCB resistor, you need to know the following parameters:
    The power rating (Watts) and tolerance (percentage).
    The temperature coefficient of resistance.
    Operating voltage range.

    Resistors have three- or four-digit codes that identify the resistance and tolerance of the resistor. This method of marking resistors is called the PCB resistor code.
    Three-digit codes consist of three digits, with the first digit indicating the value of the resistance in ohms, and the second digit indicating the tolerance.
    Four-digit codes consist of four digits—one for each digit in the three-digit code. The first two digits are always zero—they specify that this resistor has no tolerance or specification. The last two digits are always one—they specify that this resistor has a specification between 1% and 10%.

    Related Posts

    Related Posts

    PCB Impedance Board – Everything You Need to Know

    PCB Impedance Board – Everything You Need to Know

    PCB impedance boards are the backbone of high-performance electronic systems, where signal integrity reigns supreme. These specialized printed circuit boards are meticulously designed and crafted ...
    How to install a resistor on a printed circuit board

    How to install a resistor on a printed circuit board?

    The application of resistors on a Printed Circuit Board (PCB) is an important aspect of circuit design. Resistor is a component used to limit the ...
    Unpacking SMT PCB Assembly – Surface Mount Technology

    Unpacking SMT PCB Assembly – Surface Mount Technology

    This article demystifies what defines SMT PCB assembly processes, machinery, cost structures, advantages over predecessors, and selection strategies for manufacturing partners.
    Conventional PCB Manufacturing vs. Rapid Prototyping PCB – A Detailed Comparison

    Conventional PCB Manufacturing vs. Rapid Prototyping PCB – A Detailed Comparison

    In the ever-evolving landscape of electronics, the creation of printed circuit boards (PCBs) stands as a critical aspect of product development. Whether it's for consumer ...
    IBE Electronics Meet You At CES (Consumer Electronics Show) 2024

    IBE Electronics Meet You At CES (Consumer Electronics Show) 2024

    As one of the global ODM/OEM manufacturers with a mass manufacturing base, IBE invites you to visit our Booth 2012&2014 and Booth 2929 on January ...
    Request a Quote

    Leave a Comment

    Your email address will not be published. Required fields are marked *

    en_USEnglish
    Scroll to Top