• Latest
  • Trending
  • All
  • Capacitors
  • Resistors
  • Inductors
  • Filters
  • Fuses
  • Non-linear Passives
  • Applications
  • Integrated Passives
  • Oscillators
  • Passive Sensors
  • New Technologies
  • Aerospace & Defence
  • Automotive
  • Industrial
  • Market & Supply Chain
  • Medical
  • RF & Microwave
  • Telecommunication

Critical Resistance Value The Relationship Between Working Voltage and Power

7.6.2016

Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

26.5.2022
Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

26.5.2022

Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

26.5.2022

Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

25.5.2022
  • Home
  • Privacy Policy
  • EPCI Advertisement & Membership
  • About
No Result
View All Result
NEWSLETTER
Passive Components Blog
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication

    Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

    Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

    Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

    Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

    Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

    A set of printed sample cubes showcasing the effects of laser power and print speed on the magnetic core structures. Image source: Tallinn University of Technology

    Researchers 3D Printed Superior Soft Magnetic Cores with Laser Additive Process

    TDK Introduces Improved Performance PFC Capacitors

    Yageo Venture to Acquire 30% of APEC and Step Into Semiconductor MOSFET Business

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Stackpole Presents High Current Metal Shunt Resistors

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Coverlay – More than a Flexible Soldermask Substitute; WE Webinar

    Soldering THT Components by SMD Reflow Assembly; WE Webinar

    Strain Gage Resistive Sensor Simulation; Vishay Video

    EMC Filters Explained – from Component to Design; WE Webinar

    How to Avoid EMI Noise on Data Cable by Isolated Power Module; WE askLorandt Video

    Introduction to Wireless Power Transfer; WE Webinar

    How to Pass Conducted Emissions Using Line Filters; WE Webinar

    EMI Debugging of a Low Power Buck Converter; WE Webinar

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Preferred Suppliers
  • Who is Who
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • Market & Supply Chain
    • Medical
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors
    • Resistors
    • RF & Microwave
    • Telecommunication

    Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

    Crusher at the Wodgina lithium mine in Western Australia. Image courtesy of Mineral Resources.

    Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

    Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

    Impact of Ripple Current on Aluminum Electrolytic Capacitors Lifetime

    A set of printed sample cubes showcasing the effects of laser power and print speed on the magnetic core structures. Image source: Tallinn University of Technology

    Researchers 3D Printed Superior Soft Magnetic Cores with Laser Additive Process

    TDK Introduces Improved Performance PFC Capacitors

    Yageo Venture to Acquire 30% of APEC and Step Into Semiconductor MOSFET Business

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Stackpole Presents High Current Metal Shunt Resistors

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos
    • Sensors

    Vishay NTC Thermistor LTspice Simulation for PID Optimization; Vishay Webinar

    Coverlay – More than a Flexible Soldermask Substitute; WE Webinar

    Soldering THT Components by SMD Reflow Assembly; WE Webinar

    Strain Gage Resistive Sensor Simulation; Vishay Video

    EMC Filters Explained – from Component to Design; WE Webinar

    How to Avoid EMI Noise on Data Cable by Isolated Power Module; WE askLorandt Video

    Introduction to Wireless Power Transfer; WE Webinar

    How to Pass Conducted Emissions Using Line Filters; WE Webinar

    EMI Debugging of a Low Power Buck Converter; WE Webinar

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Preferred Suppliers
  • Who is Who
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

Critical Resistance Value The Relationship Between Working Voltage and Power

7.6.2016
Reading Time: 4 mins read
0 0
0
SHARES
808
VIEWS

source: ECN article

Mon, 06/06/2016 – 2:39pm by Kory Schroeder, Director of Marketing & Product Engineering, Stackpole Electronics
With improvements in manufacturing and materials technology, resistor manufacturers have been able to increase the rated power for a given chip size. These higher power resistors can be an effective way to downsize or to add functionality to circuit designs, but understanding the relationship between the working voltage rating and power rating is vital.

“Critical resistance value” is defined as the resistance value at which a particular part may operate at both full rated power and full rated voltage.  Most resistor manufacturers specify a maximum working voltage in addition to the power rating. The relationship between working voltages and power ratings significantly impacts a resistor’s function at the low end and high end of the value range.  This relationship applies to all resistors regardless of technology or manufacturer.

The graph above illustrates the relationship among working voltage, power rating, and resistance value for a 0603 size chip resistor. At values below 56.25K ohms, the amount of electrical energy the part can withstand is determined by the maximum power rating of 0.1W. If, for example, a 10 ohm 0603 was subjected to the maximum working voltage of 75 volts, the resulting power through the part would be 562.5 watts, which far exceeds the power rating of the part. Conversely, for high resistance values, the amount of electrical energy that the 0603 resistor can withstand is determined by the working voltage rating of 75 volts. If a 10Meg ohm 0603 was subjected to the maximum power of 0.1W, the voltage implied across the part would be 1000 volts, which surpasses the voltage handling of the part.

From this data, it is clear that only at exactly 56.25K ohms can the 0603 resistor handle both 75 volts and 0.1W simultaneously. While this is of some interest for all resistors, it is most important when dealing with high value and high voltage resistors, or low resistor values such as current sensing and wirewound resistors.

Current Sense Resistors and Wirewounds

Current sensing resistors are focused on the regulating and monitoring of power from a supply to an end device. With rapidly expanding component design technologies, current sensing resistors are used for a wide variety of handheld electronic devices, power supplies of all types, and LED drivers.

When an application requires dissipating more than 5 watts of power for an extended period, wirewound resistors are often the logical choice. These resistors are known for their ability to withstand high amounts of current and remain electrically and environmentally stable. Wirewound resistors feature several parameters that are adjustable. This gives them advantages over film resistors.

Current sense and wirewound resistor data sheets often don’t have a working voltage specified on them at all. This is primarily due to the fact that these series only offer low resistance values where the amount of electrical energy the part can withstand is determined only by the power rating. For example, using the general purpose 0603 chip resistor graph above, if this part were only available in resistance values below 50K ohms, then the voltage rating of 75 volts would be meaningless; you could never actually apply 75 volts to the part continuously because that would exceed the power rating.

For wirewound resistors, some of the most challenging applications are those that require high voltage handling. Because wirewound resistors typically only offer low resistance values, any application using wirewounds that must withstand high voltage transients requires that the element wire be uniquely specified for that purpose.

High Voltage Resistors

Critical resistance value is extremely important to high voltage resistors. High voltage requirements typically correspond to high resistance values and vice versa. The reason for this is Ohm’s law and the power equation for voltage. Put simply, high voltage across a low resistance value would cause an unreasonable amount of power to be generated. This in turn would require a very large resistor to dissipate the energy and would probably exceed the product’s capabilities.

Occasionally customers will assume that since a certain resistor is defined and designed for high voltage applications, the working voltage rating applies to all resistance values for a given size. The above graph shows that although the numbers have changed significantly compared to the general purpose 0603, the relationship is still the same. Since the high voltage 2512 size resistor offers resistance values below 4.5Meg ohm (the critical resistance value), it is important to realize that these resistance values will not handle the full rated working voltage continuously without violating the power rating of the device. Since many high voltage applications require high resistance values, this typically is not an issue.

The resistor market has responded with technological advances and improvements to attempt to meet whatever the power system design requires. Power systems continue to push the technological envelope for higher power ratings, better electrical stability, smaller chip sizes, and of course lower component costs. However, when specifying resistors, one of the most important factors to understand is the critical resistance values and how they relate to power and voltage. In short, the amount of electrical energy the part can withstand is determined by the maximum power rating. Selecting a resistor that can handle the rated power without exceeding the maximum working voltage is vital in every power system. Choosing a resistor without this data can lead to degradation of the resistor and catastrophic failure of the power system and the electronic device.

RelatedPosts

Euroquartz Releases SMD VCXO Low Jitter HF Oscillator

Restart of Wodgina Mine is a Good News for Tantalum and Lithium Supply Chain

Vishay Introduces Highest Energy Density Wet Tantalum Capacitors

source: ECN article

Mon, 06/06/2016 – 2:39pm by Kory Schroeder, Director of Marketing & Product Engineering, Stackpole Electronics
With improvements in manufacturing and materials technology, resistor manufacturers have been able to increase the rated power for a given chip size. These higher power resistors can be an effective way to downsize or to add functionality to circuit designs, but understanding the relationship between the working voltage rating and power rating is vital.

“Critical resistance value” is defined as the resistance value at which a particular part may operate at both full rated power and full rated voltage.  Most resistor manufacturers specify a maximum working voltage in addition to the power rating. The relationship between working voltages and power ratings significantly impacts a resistor’s function at the low end and high end of the value range.  This relationship applies to all resistors regardless of technology or manufacturer.

The graph above illustrates the relationship among working voltage, power rating, and resistance value for a 0603 size chip resistor. At values below 56.25K ohms, the amount of electrical energy the part can withstand is determined by the maximum power rating of 0.1W. If, for example, a 10 ohm 0603 was subjected to the maximum working voltage of 75 volts, the resulting power through the part would be 562.5 watts, which far exceeds the power rating of the part. Conversely, for high resistance values, the amount of electrical energy that the 0603 resistor can withstand is determined by the working voltage rating of 75 volts. If a 10Meg ohm 0603 was subjected to the maximum power of 0.1W, the voltage implied across the part would be 1000 volts, which surpasses the voltage handling of the part.

From this data, it is clear that only at exactly 56.25K ohms can the 0603 resistor handle both 75 volts and 0.1W simultaneously. While this is of some interest for all resistors, it is most important when dealing with high value and high voltage resistors, or low resistor values such as current sensing and wirewound resistors.

Current Sense Resistors and Wirewounds

Current sensing resistors are focused on the regulating and monitoring of power from a supply to an end device. With rapidly expanding component design technologies, current sensing resistors are used for a wide variety of handheld electronic devices, power supplies of all types, and LED drivers.

When an application requires dissipating more than 5 watts of power for an extended period, wirewound resistors are often the logical choice. These resistors are known for their ability to withstand high amounts of current and remain electrically and environmentally stable. Wirewound resistors feature several parameters that are adjustable. This gives them advantages over film resistors.

Current sense and wirewound resistor data sheets often don’t have a working voltage specified on them at all. This is primarily due to the fact that these series only offer low resistance values where the amount of electrical energy the part can withstand is determined only by the power rating. For example, using the general purpose 0603 chip resistor graph above, if this part were only available in resistance values below 50K ohms, then the voltage rating of 75 volts would be meaningless; you could never actually apply 75 volts to the part continuously because that would exceed the power rating.

For wirewound resistors, some of the most challenging applications are those that require high voltage handling. Because wirewound resistors typically only offer low resistance values, any application using wirewounds that must withstand high voltage transients requires that the element wire be uniquely specified for that purpose.

High Voltage Resistors

Critical resistance value is extremely important to high voltage resistors. High voltage requirements typically correspond to high resistance values and vice versa. The reason for this is Ohm’s law and the power equation for voltage. Put simply, high voltage across a low resistance value would cause an unreasonable amount of power to be generated. This in turn would require a very large resistor to dissipate the energy and would probably exceed the product’s capabilities.

Occasionally customers will assume that since a certain resistor is defined and designed for high voltage applications, the working voltage rating applies to all resistance values for a given size. The above graph shows that although the numbers have changed significantly compared to the general purpose 0603, the relationship is still the same. Since the high voltage 2512 size resistor offers resistance values below 4.5Meg ohm (the critical resistance value), it is important to realize that these resistance values will not handle the full rated working voltage continuously without violating the power rating of the device. Since many high voltage applications require high resistance values, this typically is not an issue.

The resistor market has responded with technological advances and improvements to attempt to meet whatever the power system design requires. Power systems continue to push the technological envelope for higher power ratings, better electrical stability, smaller chip sizes, and of course lower component costs. However, when specifying resistors, one of the most important factors to understand is the critical resistance values and how they relate to power and voltage. In short, the amount of electrical energy the part can withstand is determined by the maximum power rating. Selecting a resistor that can handle the rated power without exceeding the maximum working voltage is vital in every power system. Choosing a resistor without this data can lead to degradation of the resistor and catastrophic failure of the power system and the electronic device.

Related Posts

Other

Soldering, PCB Handling and Rework

19.7.2021
3.1k
Other

Murata introduces its largest capacitance 3-terminal capacitor in the 05035 / 0402 inch size for smartphones

12.10.2017
180
Other

Friendly Atmosphere and Networking Pleased the 1st PCNS Participants

6.3.2018
22

Popular Posts

  • Understanding High-Precision Resistor Temperature Coefficient of Resistance

    0 shares
    Share 0 Tweet 0
  • What is a Dielectric Constant of Plastic Materials ?

    4 shares
    Share 4 Tweet 0
  • Ripple Current and its Effects on the Performance of Capacitors

    3 shares
    Share 3 Tweet 0
  • Why Low ESR Matters in Capacitor Design

    0 shares
    Share 0 Tweet 0
  • Capacitor Selection for Coupling and Decoupling Applications

    28 shares
    Share 28 Tweet 0

Newsletter Subscription

 

  • Home
  • Privacy Policy
  • EPCI Advertisement & Membership
  • About

© 2021 EPCI - Premium Passive Components Educational and Information Site

No Result
View All Result
  • Home
  • News
  • Video
  • Knowledge Blog
  • Preferred Suppliers
  • Events

© 2021 EPCI - Premium Passive Components Educational and Information Site

Welcome Back!

Login to your account below

Forgotten Password?

Retrieve your password

Please enter your username or email address to reset your password.

Log In
This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.