Current Sensing / Low Resistance

Current Sensing / Low Resistance

Current sensing resistors are resistors used for measuring current in the circuit which can be converted using Ohm’s Law into a voltage reading. They usually come in very low resistance values, often measured in micro Ohms. At Rhopoint Components we offer a wide range of current sensing resistors by leading manufacturers including Isabellenhutte, Alpha, Caddock, Riedon and Susumu. Our current sensing resistors come in various shapes and sizes, surface-mount and through-hole, and we can cater for virtually any resistance value.

Can't find what you're looking for? Contact us, we can often offer customised solution to meet all your needs.

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Alpha FNP Series

The FNP high power precision shunt resistor series from Alpha Electronics offers a range of very high precision current sensing shunts with a maximum power rating of 500W on a suitable heat sink at +25°C. By utilising a Ni-Cr Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients. The FNP shunt resistor series has a built in Pt100 sensor for monitoring the temperature of the resistive element.

  • High power precision shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω (higher values may be available upon request)
  • Tight tolerance options as low as ±0.05% available
  • Tight TCR options available of ±1 ppm/°C and ±2.5 ppm/°C (+25°C to +60°C) or ±5 ppm/°C (-25°C to +125°C)
  • Maximum rated power of 500W
  • Maximum working current of 320A
  • Maximum rated operating temperature +75°C (resistance values greater than 0.01Ω, +25°C for resistances of 0.01Ω or below)
  • Working temperature from -55°C up to +125°C
  • Single pulse power load of 50J (<10ms)

The Alpha Electronics FNP precision shunt resistor series are constructed out of the following materials:

  • Base plate - Nickel-plated Copper
  • Current terminals - Nickel-plated Copper (T = 1.0mm)
  • Voltage and Pt terminals - Nickel-plated Copper (T = 0.5mm)
  • Package - PPS injection-moulded case

Alpha's Ni-Cr Bulk Metal® foil resistor technology means these high power precision shunt resistors resistors are ideal in applications like:

  • Output reference of precision power supply
  • Reference of charge-discharge test for high capacity batteries

The below table gives a summary of the specifications and options available for the Alpha FNP series:

Alpha FNP Specifications

* Keep temperature of the resistive element surface less than +125°C
** Please contact us for higher resistance values

£0.00 Ex Tax: £0.00

Alpha PSB Series

The PSB ultra-precision power shunt resistor series from Alpha Electronics offers 4-terminal (Kelvin) connections for current sensing and a power rating of up to 40W on a heat sink or 12W in free air (at +25°C) all with a low ohmic resistance range from 0.001Ω to 1Ω. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer excellent temperature characteristics with low temperature coefficients down to ±5 ppm/°C between the resistance range 0.005Ω and 1Ω.

  • Ultra-precision power shunt resistor
  • Available in any resistance between 0.001Ω and 1Ω
  • 4-terminal (Kelvin) connection high power shunt
  • High heat dissipation due to aluminium-clad construction with fins
  • Power rating of 40W on a heat sink or 12W in free air at +25°C
  • Tolerances as low as ±0.1% over the whole resistance range
  • Tight TCR available of ±5 ppm/°C between 0.005Ω and 1Ω
  • Maximum working current of 100A
  • Maximum rated operating temperature +25°C
  • Working temperature from -55°C up to +85°C

The PSB ultra-precision shunt resistor series exhibits excellent temperature characteristics thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision and high power applications.

The 4-terminal connections of this high power shunt series offers accurate current sensing capabilities even in low extremity of resistance.

The PSB series has been designed for easy mounting to heat sink or water-cooled radiator as well as with threaded holes to fix cables with screws (Caution: please screw current terminals >5N·m and voltage terminals >1N·m)

Their 4-terminal design and high precision make them ideal for current sensing in precise power supply or motor driver applications.

The below table gives a summary of the specifications and options available for the Alpha PSB series:

Alpha PSB Specifications

* Thermal resistance of the heat sink 1°C/W
Available to use higher rated power with elevation of cooling effect
Please keep temperature of element surface less than +60°C

£0.00 Ex Tax: £0.00

Alpha RBD Series

The RBD ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 2-terminal current sense resistor in a flip-chip surface-mount package
  • Power rating of 0.5W at +70°C
  • Tolerances as low as ±0.5% over the resistance range of 0.1Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.1Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBD ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBD series:

Alpha RBD Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RBF Series

The RBF ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 2-terminal flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C (between -25°C and +125°C) both within the resistance range of 0.1Ω to 1Ω.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 2-terminal current sense resistor in a flip-chip surface-mount package
  • Power rating of 1W at +70°C
  • Tolerances as low as ±0.5% over the resistance range of 0.1Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.1Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBF ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBF series:

Alpha RBF Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RBH Series

The RBH ultra-precision current sense resistor series from Alpha Electronics offers low resistances of between 0.01Ω and 1Ω all in a small 4-terminal (Kelvin connection) flip-chip package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.5% as well as a low TCR of ±10 ppm/°C between -25°C and +125°C.

  • Ultra-precision current sense flip-chip resistor
  • Available in any resistance between 0.01Ω and 1Ω
  • 4-terminal (Kelvin connection) current sense resistor in a flip-chip surface-mount package
  • Power rating of 1.5W at +70°C
  • Tolerances as low as ±0.5% over the whole resistance range of 0.01Ω to 1Ω
  • Tight TCR available of ±10 ppm/°C over the resistance range of 0.01Ω to 1Ω
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RBH ultra-precision current sense resistor series offer ultra-precision thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

Temperature rise of resistor surface can be optimised by using a board made of metal. This keeps the temperature rise very low allowing increased power rating of the parts i.e. 2W at +70°C. Please keep the temperature of board less than +90°C when using glazed epoxy board.

The below table gives the full specifications for each resistor model available including the Alpha RBH series:

Alpha RBH Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha RWA Series

The RWA precision wraparound SMD resistor series from Alpha Electronics offers resistances from 100Ω up to 5kΩ, all with a small 0603 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.05% (between 1kΩ and 5kΩ) as well as a low TCR of ±5 ppm/°C (between -25°C and +125°C) over the whole resistance range. The Alpha RWA series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 100Ω and 5kΩ
  • 2-terminal resistor in a 0603 surface-mount package
  • Power rating of 0.1W at +70°C
  • Tolerances as low as ±0.05% over the resistance range of 1kΩ to 5kΩ
  • Tight TCR available of ±5 ppm/°C over the resistance range of 100Ω to 5kΩ
  • Maximum working voltage of 22V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWA high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWA series:

Alpha RWA Specifications

£0.00 Ex Tax: £0.00

Alpha RWB Series

The RWB precision wraparound SMD resistor series from Alpha Electronics offers resistances from 10Ω up to 10kΩ, all with a small 0805 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.02% (between 1kΩ and 10kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 10kΩ. The Alpha RWB series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 10Ω and 10kΩ
  • 2-terminal resistor in a 0805 surface-mount package
  • Power rating of 0.2W at +70°C
  • Tolerances as low as ±0.02% over the resistance range of 1kΩ to 10kΩ
  • Tight TCR available as low as ±2 ppm/°C over the resistance range of 100Ω to 10kΩ
  • Maximum working voltage of 45V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWB high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWB series:

Alpha RWB Specifications

£0.00 Ex Tax: £0.00

Alpha RWC Series

The RWC precision wraparound SMD resistor series from Alpha Electronics offers resistances from 5Ω up to 30kΩ, all with a small 1206 chip size. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to offer low tolerances down to ±0.01% (between 1kΩ and 30kΩ) as well as a low TCR of ±2 ppm/°C (between -25°C and +125°C) from 100Ω up to 30kΩ. The Alpha RWC series also offers excellent load-life stability of ±0.005% typical (+70°C, 2000 hours at rated power).

  • High precision wraparound SMD resistor
  • Available in any resistance between 5Ω and 30kΩ
  • 2-terminal resistor in a 1206 surface-mount package
  • Power rating of 0.3W at +70°C
  • Tolerances as low as ±0.01% over the resistance range of 1kΩ to 30kΩ
  • Tight TCR available as low as ±2 ppm/°C over the resistance range of 100Ω to 30kΩ
  • Maximum working voltage of 95V
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +155°C

The RWC high precision wraparound surface-mount resistor series offers high precision and excellent stability thanks to Alpha's Bulk Metal® foil resistor technology, making them suitable for the most demanding precision applications.

The below table gives the full specifications for each resistor model available including the Alpha RWC series:

Alpha RWC Specifications

£0.00 Ex Tax: £0.00

Caddock CC1512FC Series

The CC1512FC low resistance precision flip-chip surface-mount resistor series from Caddock offer resistance values from as low as 0.01Ω up to 10Ω making them ideal for current sensing applications. The CC1512FC series features low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. For general applications, the CC1512FC series has a power rating of 0.75W (at +70°C).

  • Low resistance precision flip-chip resistor
  • Flip-chip version for surface-mount applications (FC)
  • 1512 chip size
  • Resistance values from 0.01Ω to 10Ω
  • Bare ceramic back surface
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerances from as low as ±1.0% up to ±5.0% (resistance value dependent)
  • TCR from as low as -20 to +80 ppm/°C (resistance values of 0.5Ω and above)
  • Operating temperature range from -55°C up to +150°C

The CC1512FC series from Caddock are the best choice for switching power supplies, motor speed controls and high current sensing applications.

Thermal resistance is provided for the CC1512FC series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

The recommended solders for flip-chip solder attachment are Sn (62) / Pb (36) / Ag (2), Sn (96.5) / Ag (3.5), or standard Sn / Ag / Cu solder alloys.

The below table gives the available specifications for the complete CC FC series including the CC1512FC:

Caddock CC FC Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CC2015FC Series

The CC2015FC low resistance precision flip-chip surface-mount resistor series from Caddock offers resistance values from as low as 0.02Ω up to 10Ω making it ideal for current sensing applications. The CC2015FC series features low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. For general applications, the CC2015FC series has a power rating of 1W (at +70°C).

  • Low resistance precision flip-chip resistor
  • Flip-chip version for surface-mount applications (FC)
  • 2015 chip size
  • Resistance values from 0.02Ω to 10Ω
  • Bare ceramic back surface
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerances from as low as ±1.0% up to ±5.0% (resistance value dependent)
  • TCR from as low as -20 to +80 ppm/°C (resistance values of 0.5Ω and above)
  • Operating temperature range from -55°C up to +150°C

The CC2015FC series from Caddock is the best choice for switching power supplies, motor speed controls and high current sensing applications.

Thermal resistance is provided for the CC2015FC series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

The recommended solders for flip-chip solder attachment are Sn (62) / Pb (36) / Ag (2), Sn (96.5) / Ag (3.5), or standard Sn / Ag / Cu solder alloys.

The below table gives the available specifications for the complete CC FC series including the CC2015FC:

Caddock CC FC Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CC2015WB Series

The CC2015WB low resistance precision wire-bondable surface-mount resistor series from Caddock offers resistance values from as low as 0.02Ω up to 10Ω making it ideal for current sensing applications. The CC2015WB series features low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. The WB variant of the CC series from Caddock is a hybrid mountable version with metallised pads for wire-bonding utilising aluminium wire and a metallised back surface for solder attachment of the back surface to a heat sinking substrate.

  • Low resistance precision wire-bondable resistor
  • Wire-bondable version for hybrid applications (WB)
  • 2015 chip size
  • Resistance values from 0.02Ω to 10Ω
  • Metallised back surface for soldering to substrate or a heat sink
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerances from as low as ±1.0% up to ±5.0% (resistance value dependent)
  • TCR from as low as -20 to +80 ppm/°C (resistance values of 0.5Ω and above)
  • Operating temperature range from -55°C up to +150°C

The CC2015WB series from Caddock is the best choice for switching power supplies, motor speed controls and high current sensing applications.

Thermal resistance is provided for the CC2015WB series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

The recommended solders are Sn (62) / Pb (36) / Ag (2), Sn (96.5) / Ag (3.5), or standard Sn / Ag / Cu solder alloys.

The below table gives the available specifications for the complete CC WB series including the CC2015WB:

Caddock CC WB Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CC2520FC Series

The CC2520FC low resistance precision flip-chip surface-mount resistor series from Caddock offers resistance values from as low as 0.01Ω up to 10Ω making it ideal for current sensing applications. The CC2520FC series features low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. For general applications, the CC2520FC series has a power rating of 1.5W (at +70°C).

  • Low resistance precision flip-chip resistor
  • Flip-chip version for surface-mount applications (FC)
  • 2520 chip size
  • Resistance values from 0.01Ω to 10Ω
  • Bare ceramic back surface
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerances from as low as ±1.0% up to ±5.0% (resistance value dependent)
  • TCR from as low as -20 to +80 ppm/°C (resistance values of 0.5Ω and above)
  • Operating temperature range from -55°C up to +150°C

The CC2520FC series from Caddock is the best choice for switching power supplies, motor speed controls and high current sensing applications.

Thermal resistance is provided for the CC2520FC series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

The recommended solders for flip-chip solder attachment are Sn (62) / Pb (36) / Ag (2), Sn (96.5) / Ag (3.5), or standard Sn / Ag / Cu solder alloys.

The below table gives the available specifications for the complete CC FC series including the CC2520FC:

Caddock CC FC Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CC2520WB Series

The CC2520WB low resistance precision wire-bondable surface-mount resistor series from Caddock offers resistance values from as low as 0.025Ω up to 10Ω making it ideal for current sensing applications. The CC2520WB series features low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. The WB variant of the CC series from Caddock is a hybrid mountable version with metallised pads for wire-bonding utilising aluminium wire and a metallised back surface for solder attachment of the back surface to a heat sinking substrate.

  • Low resistance precision wire-bondable resistor
  • Wire-bondable version for hybrid applications (WB)
  • 2520 chip size
  • Resistance values from 0.025Ω to 10Ω
  • Metallised back surface for soldering to substrate or a heat sink
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerances from as low as ±1.0% up to ±5.0% (resistance value dependent)
  • TCR from as low as -20 to +80 ppm/°C (resistance values of 0.5Ω and above)
  • Operating temperature range from -55°C up to +150°C

The CC2520WB series from Caddock is the best choice for switching power supplies, motor speed controls and high current sensing applications.

Thermal resistance is provided for the CC2520WB series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

The recommended solders are Sn (62) / Pb (36) / Ag (2), Sn (96.5) / Ag (3.5), or standard Sn / Ag / Cu solder alloys.

The below table gives the available specifications for the complete CC WB series including the CC2520WB:

Caddock CC WB Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CD2015FC Series

The CD2015FC low resistance precision flip-chip surface-mount resistor series from Caddock offers resistance values from as low as 0.01Ω up to 0.2Ω making it ideal for current sensing applications. The CD2015FC series features a unique pedestal terminal design for surface-mount applications as well as low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. For general applications, the CD2015FC series has a power rating of 1W (at +70°C).

  • Flip-chip version for surface-mount applications (FC)
  • 2015 chip size
  • Resistance values from 0.01Ω to 0.2Ω
  • Pedestal terminal design helps maintain precision and its copper core provides heat spreading which enhances the high power handling capabilities
  • Bare ceramic back surface
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerance of ±1.0%
  • TCR from as low as 0 to +100 ppm/°C (resistance values of 0.05Ω up to 0.2Ω)
  • Operating temperature range from -55°C up to +150°C

Thermal resistance is provided for the CD2015FC series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

Please note that during soldering of all CD resistors from Caddock, the soldering temperature profile must not cause the pedestal terminals of this device to exceed +220°C.

The recommended solders for flip-chip solder attachment are Sn (62) / Pb (36) / Ag (2).

The below table gives the available specifications for the complete CD FC series including the CD2015FC:

Caddock CD FC Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00

Caddock CD2015WBA Series

The CD2015WBA low resistance precision wire-bondable surface-mount resistor series from Caddock offers resistance values from as low as 0.01Ω up to 0.2Ω making it ideal for current sensing applications. The CD2015WBA series features a unique pedestal terminal design for surface-mount applications as well as low inductance of 5nH (typical) which provides excellent high frequency and pulse response, with high pulse handling and overload capabilities. The WBA variant of the CD series from Caddock is a hybrid mountable version with copper pedestal terminals and an aluminium surface layer for wire-bonding utilising aluminium wire and a metallised back surface for solder attachment of the back surface to a heat sinking substrate.

  • Low resistance precision wire-bondable resistor
  • Wire-bondable version for hybrid applications (WB)
  • 2015 chip size
  • Resistance values from 0.01Ω to 0.2Ω
  • Pedestal terminal design helps maintain precision and its copper core provides heat spreading which enhances the high power handling capabilities
  • Bare ceramic back surface
  • High pulse handling and overload capabilities
  • Low inductance of 5nH (typical) provides excellent high frequency and pulse response
  • Tolerance of ±1.0%
  • TCR from as low as 0 to +100 ppm/°C (resistance values of 0.05Ω up to 0.2Ω)
  • Operating temperature range from -55°C up to +150°C

Thermal resistance is provided for the CD2015WBA series to optimise high power designs when utilising higher thermal conductivity circuit board substrates such as IMS or Alumina. Please see datasheet for further details.

Please note that during soldering of all CD resistors from Caddock, the soldering temperature profile must not cause the pedestal terminals of this device to exceed +220°C.

The recommended solders for flip-chip solder attachment are Sn (62) / Pb (36) / Ag (2).

The below table gives the available specifications for the complete CD WBA series including the CD2015WBA:

Caddock CD WBA Specifications

Please see datasheet for notes relating to the power capabilities.

£0.00 Ex Tax: £0.00