Electronic Components

Rhopoint Components was established over 40 years ago as a distributor of precision resistors and passive electronic components have formed a core of the company ever since, although our portfolio has grown considerably. Apart from vast range of resistors in virtually any resistance rating, we also offer a selection of thermistors and inrush current limiters, capacitors, digital isolators, high quality reed relays including the high voltage options, reed switches and products based on the reed switch technology such as flow and float switches for liquid level management, and much more.

We have long standing relationships with most of our carefully selected manufacturing partners, to ensure that our customers only receive quality components suitable for long term designing-in. Our sales engineers all have background in electronics and working knowledge of the electronic components, reinforced by regular training from the manufacturers themselves, so our in-house knowledge is always up to date. That is why we can speak to the design engineers and help them find, price and design-in a solution for their application.

We understand that reading through endless datasheets and looking for an off-the-shelf component that will tick all the boxes is a tedious task. Our team can help whatever your application - they can not only propose a suitable existing model where available, but also offer customised solutions. Majority of our manufacturing partners are able to customise their standard products at no, or very little, extra cost - whether a custom resistance rating, TCR, VCR or tolerance values, lead length or terminations.

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Alpha ADR 1-Dial Series

The ADR 1-dial resistance box series from Alpha Electronics offers a range of standard resistors which are ideally suited for repetitive daily work. The single dial system means the resistance is easily switched from one value to another. This greatly improves work efficiency and helps to avoid mistakes, which may happen when using a 6-dial decade standard resistor. They are ideally suited for RTD simulation for platinum (Pt) related products and conductive meters.

  • Fully customisable 1-dial resistance box (up to 24 resistance values)
  • Up to 5-digit resistance values on switching contacts may be specified
  • Resistance values available from 1Ω up to 1MΩ
  • Improved work efficiency and elimination of careless mistakes
  • Lightweight, compact size
  • High precision
  • High stability

The resistance elements utilise Bulk Metal® Foil technology and the connections to the rotary switch are made by using 4-terminal junctions. This ensures that high precision, high stability and low temperature coefficients are achieved.

The ADR-1xxx 1-Dial resistance box is fully customisable. Up to 24 different resistance values can be set into the box.

The ADR-1xxx series has a weight of approximately 1kg and dimensions of 100mm x 150mm x 80mm.

The below table gives the full specifications available for the Alpha ADR 1-dial resistance box series:

Alpha ADR 1-Dial Specifications

Tolerance and temperature coefficient varies with resistance values.

£0.00 Ex Tax: £0.00

Alpha ADR 6-Dial Series

The ADR 6-dial decade resistance box series from Alpha Electronics, with 6½ digit readings, features ultra precision resistors, low contact resistance rotary switches, low thermal EMF output terminals and the double shielded construction. There are 5 models of the ADR 6-dial decade resistance box available, each offering different resistance ranges starting from 0.1Ω minimum to 1.111210KΩ maximum up to 10Ω minimum to 11.11110MΩ maximum.

  • 6-Dial decade resistance box
  • Accuracy down to ≤0.005% +2mΩ for some models
  • Temperature coefficient of resistance ≤5ppm /°C
  • Long-term stability in resistance ≤50ppm/year (storage life)
  • Low contact resistance switch and three clip-typed contacts in parallel
  • Low thermal EMF terminal
  • Double electrical shielding protective against noise
  • Maximum power rating of 0.5W

All resistors used in this Decade Resistance Box are from the ultra precision Bulk Metal® Foil resistors manufactured by Alpha Electronics, assuring high stability over time and environment change.

The rotary switches have very low contact resistance which is achieved by connecting three clip-type contacts in parallel. This method also ensures a higher mechanical reliability. Low thermal EMF output terminals use a low thermal resistance rectangular wire circuit configuration. A double shielded construction inhibits interference of environmental noise.

The ADR 6-dial resistance box series has a weight of approximately 4.5kg and dimensions of 430mm x 140mm x 99mm.

The below table gives the full specifications for each model available of the Alpha ADR 6-dial decade resistance box series:

Alpha ADR 6-Dial Specifications

£0.00 Ex Tax: £0.00

Alpha ASR Series

The ASR series from Alpha Electronics is an extremely stable standard resistor. It utilises their Ni/Cr alloy Bulk Metal® Foil technology for the resistive elements, which helps provide high stability and a low temperature coefficient. With the extreme stability of this resistor relative to temperature change, the ASR can be used in air without the need of an oil bath or critical environmental temperature control, eliminating added operation and maintenance costs.

  • Standard Resistor
  • Excellent long-term stability of resistance, less than 3 ppm/year
  • Low temperature coefficient, less than 0.2 ppm/°C
  • Resistance options between 1Ω to 10MΩ available
  • Excellent AC characteristics due to Bulk Metal® Foil technology
  • Compact construction designed for simple operation and storage
  • Power rating of 0.1W (0.5W for the ADR-1R0 model)
  • Maximum working temperature of +50°C
  • Operating temperature range of 0 to +50°C
  • Storage temperature range from -10°C to +60°C

Due to Alpha Electronics long-term experience in developing and enhancing ultra-stable Bulk Metal® Foil technology, they are able to provide products with consistency of performance under strict quality control. The ASR is designed to be used in a wide range of environments; from making precise measurements on the production floor, to providing corporate traceability as a calibration and reference standard.

The resistors are mounted within a compact and sturdy box. A cover is provided to protect the resistors and connection terminals from damage during transport and storage.

The ASR series has a weight of approximately 2.5kg and dimensions of 155mm x 97mm x 112mm.

The below table gives the full specifications for each model available of the Alpha ASR series:

Alpha ASR Specifications

* Power = Power rating.

£0.00 Ex Tax: £0.00

Alpha ATS Series

The ATS series from Alpha Electronics is a resistance transfer standard used to calibrate working standard resistors by using a primary resistor. The ATS series consists of 10 high precision resistors of the same nominal value (R) which are connected in series known as Haymon bridge construction. The ATS unit can be used as a standard resistor due to the low temperature coefficient and high stability features of Alpha Electronics Bulk Metal® foil technology, ensuring very tight matching accuracy.

  • Resistance transfer standard for calibrating standard resistors
  • Uses Bulk Metal® Foil as a resistive element
  • Usable in air without the need of an oil bath due to its superior temperature coefficient
  • Very tight matching accuracy
  • Excellent long-term stability
  • Power rating of 0.01W per resistor element, 0.1W per unit
  • Working temperature range of +23°C ±10°C
An extremely high precision resistance ratio of 1:100 maximum is obtained by using either the ATS-LC lead compensator or the ATS-SC shorting bar. These configurations consist of:
  • connecting the 10 resistors in parallel (1/10*R)
  • connecting the 10 resistors in series (10*R)

The ATS-LC lead compensator and the ATS-SC shorting bar are available as additional options.

The ATS series has a weight of approximately 3kg and dimensions of 180mm x 70mm x 332mm.

The below table gives the full specifications for each model available of the Alpha ATS series:

Alpha ATS Specifications

£0.00 Ex Tax: £0.00

Alpha ATV Series

The ATV series from Alpha Electronics is a current / voltage (I/V) conversion adaptor used to accurately measure current using a voltage meter. Its small, lightweight construction enables it to be easily attached directly to a voltage meter for ease of operation.

  • Current / voltage conversion adaptor
  • Compact size
  • Lightweight
  • Full resistance range available from 1Ω to 100kΩ
  • Temperature coefficient of ±2.5 ppm/°C
  • ±0.1% accuracy
  • Maximum working current of up to 0.5A (ATV-1R0 1Ω model)
  • Power rating of 0.1W (0.25W for the ATV-1R0 model)

Each model corresponds to a set resistance value and maximum working current.

The below table gives the full specifications for each model available of the Alpha ATV series:

Alpha ATV Specifications

£0.00 Ex Tax: £0.00

Alpha CLA Series

The CLA ultra-precision thermosensitive resistor series from Alpha Electronics offers a highly accurate device that has a resistivity which varies linearly with temperature change in a through-hole package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce these resistors that are ideally designed for temperature detection, providing a small size and rapid response.

  • Ultra-precision thermosensitive through-hole resistor
  • Stocked in both 10Ω and 100Ω resistance values with a tolerance of ±0.5%
  • Available in any resistance between 5Ω and 100Ω
  • Tolerance options from ±5.0% down to ±0.5% available
  • Linear +4250 ±1% ppm/°C TCR characteristic (from 0 to +100°C)
  • Response time of 0.9 seconds
  • Maximum working voltage of 250V
  • Power rating of 0.125W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +125°C

These Alpha CLA ultra-precision thermosensitive resistors are made of material only a few µm thick and respond rapidly to temperature changes. Strict control of foil composition maintains uniform quality without fluctuation of temperature characteristics of resistance. They are produced by the same fine photo-etching technology used in other metal foil precision resistors from Alpha.

The CLA series has a pin pitch of 2.54 ±0.25mm.

Typical applications for the CLA ultra-precision thermosensitive resistor series include:

  • Cold junction reference for thermocouples
  • Temperature compensation in load cells
  • Temperature compensation device in semiconductor circuits
  • Temperature sensing devices

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

Alpha CLA Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha CLB Series

The CLB ultra-precision thermosensitive resistor series from Alpha Electronics offers a highly accurate device that has a resistivity which varies linearly with temperature change in a through-hole package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce these resistors that are ideally designed for temperature detection, providing a small size and rapid response.

  • Ultra-precision thermosensitive through-hole resistor
  • Stocked in a 175Ω resistance value with a tolerance of ±0.5%
  • Available in any resistance between 5Ω and 200Ω
  • Tolerance options from ±5.0% down to ±0.5% available
  • Linear +4250 ±1% ppm/°C TCR characteristic (from 0 to +100°C)
  • Response time of 1.3 seconds
  • Maximum working voltage of 300V
  • Power rating of 0.25W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +125°C

These Alpha CLB ultra-precision thermosensitive resistors are made of material only a few µm thick and respond rapidly to temperature changes. Strict control of foil composition maintains uniform quality without fluctuation of temperature characteristics of resistance. They are produced by the same fine photo-etching technology used in other metal foil precision resistors from Alpha.

The CLB series has a pin pitch of 2.54 ±0.25mm.

Typical applications for the CLB ultra-precision thermosensitive resistor series include:

  • Cold junction reference for thermocouples
  • Temperature compensation in load cells
  • Temperature compensation device in semiconductor circuits
  • Temperature sensing devices

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

Alpha CLB Specifications

* Symbols parenthesized are for part number composition

£0.00 Ex Tax: £0.00

Alpha CSR Series

The CSR working standard resistor series from Alpha electronics uses Bulk Metal® foil resistance elements, which have the same excellent stability and low temperature coefficient of resistance as the ASR series. Alpha's Bulk Metal® foil offers a precision that cannot be matched by any other resistance material. The CSR series can be customised to any resistance value from 0.001Ω up to 100MΩ.

  • Standard Resistor
  • Wide resistance range available from 0.001Ω to 100MΩ
  • Custom resistance values are available on request
  • Compact construction designed for simple operation and storage
  • Terminals aligned in a single row for easier wiring and placement
  • Low cost, high performance
  • Power rating of up to 0.5W (CSR-1N0, CSR-10N and CSR-R10 models)
  • Working temperature range of +18°C to +28°C
  • Storage temperature range of 0 to +50°C

The CSR is designed for equal ease of use either in laboratory conditions or on the production floor. The construction of the CSR series is designed to give ease of transport and storage, and can be used in normal air environments without the need for oil bath submersion.

The CSR series has a weight of approximately 300g and dimensions of 100mm x 65mm x 66.5mm.

The below table gives the full specifications for each model available of the Alpha CSR series:

Alpha CSR Specifications

£0.00 Ex Tax: £0.00

Alpha EP Series

The EP ultra-precision resistor series from Alpha Electronics offers highly stable wire-bondable resistors with a maximum resistance up to 30kΩ. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Wire-bondable ultra-precision resistor
  • Available in any resistance between 30Ω and 30kΩ
  • Tight tolerance of ±0.05% for resistances between 100Ω and 30kΩ (±0.1% for resistances between 30Ω and 100Ω)
  • Tight TCR of ±5 ppm/°C (from -55°C up to +125°C)
  • Maximum working voltage of 40V
  • Maximum working current of 0.35A
  • Power rating of 0.1W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +125°C

The Alpha EP resistors offer similar specifications to the Alpha MP and MQ resistor series in terms of power ratings, tolerances and resistance values available but are wire-bondable variants.

These ultra-precision, highly stable resistors are ideal for precision hybrid applications such as A/D hybrids.

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

Alpha EP Specifications

£0.00 Ex Tax: £0.00

Alpha EQ Series

The EQ ultra-precision resistor series from Alpha Electronics offers highly stable wire-bondable resistors with a maximum resistance up to 60kΩ. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Wire-bondable ultra-precision resistor
  • Available in any resistance between 30Ω and 60kΩ
  • Tight tolerance of ±0.05% for resistances between 100Ω and 60kΩ (±0.1% for resistances between 30Ω and 100Ω)
  • Tight TCR of ±5 ppm/°C (from -55°C up to +125°C)
  • Maximum working voltage of 40V
  • Maximum working current of 0.35A
  • Power rating of 0.125W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -65°C up to +125°C

The Alpha EQ resistors offer similar specifications to the Alpha MP and MQ resistor series in terms of power ratings, tolerances and resistance values available but are wire-bondable variants.

These ultra-precision, highly stable resistors are ideal for precision hybrid applications such as A/D hybrids.

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

Alpha EQ Specifications

£0.00 Ex Tax: £0.00

Alpha FLA Series

The FLA conformally coated resistor series from Alpha Electronics offers a very precise resistor with a resistance range from 10Ω up to 100kΩ all in a small through-hole package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Conformally coated through-hole resistor
  • Available in any resistance between 10Ω and 100kΩ
  • Tight tolerance options as low as ±0.05% available for resistances between 100Ω and 100kΩ
  • Tight TCR options available of ±2.5 ppm/°C or ±5 ppm/°C (from -25°C up to +125°C)
  • Maximum working voltage of 250V
  • Power rating of 0.125W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -25°C up to +155°C

The Alpha Electronics FLA precision resistor series have been designed with terminals that are easy for insertion into the PCB.

The FLB series has a pin pitch of 2.54 ±0.25mm.

Alpha's Bulk Metal® foil resistor technology means that these conformally coated, through-hole, precision resistors are ideal for precision measurements, also their low inductance makes them ideal for use at higher frequencies.

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

Alpha FLA Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring at the point 2.5 ±1.0mm below the shoulder of the leads

£0.00 Ex Tax: £0.00

Alpha FLB Series

The FLB conformally coated resistor series from Alpha Electronics offers a very precise resistor with a resistance range from 10Ω up to 150kΩ all in a small through-hole package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Conformally coated through-hole resistor
  • Available in any resistance between 10Ω and 150kΩ
  • Tight tolerance options as low as ±0.05% available for resistances between 100Ω and 150kΩ
  • Tight TCR options available of ±2.5 ppm/°C or ±5 ppm/°C (from -25°C up to +125°C)
  • Maximum working voltage of 300V
  • Power rating of 0.25W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -25°C up to +155°C

The Alpha Electronics FLB precision resistor series have been designed with terminals that are easy for insertion into the PCB.

The FLB series has a pin pitch of 2.54 ±0.25mm.

Alpha's Bulk Metal® foil resistor technology means that these conformally coated, through-hole, precision resistors are ideal for precision measurements, also their low inductance makes them ideal for use at higher frequencies.

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

Alpha FLB Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring at the point 2.5 ±1.0mm below the shoulder of the leads

£0.00 Ex Tax: £0.00

Alpha FLC Series

The FLC conformally coated resistor series from Alpha Electronics offers a very precise resistor with a resistance range from 10Ω up to 200kΩ all in a small through-hole package. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Conformally coated through-hole resistor
  • Available in any resistance between 10Ω and 200kΩ
  • Tight tolerance options as low as ±0.05% available for resistances between 100Ω and 200kΩ
  • Tight TCR options available of ±2.5 ppm/°C or ±5 ppm/°C (from -25°C up to +125°C)
  • Maximum working voltage of 300V
  • Power rating of 0.25W (at +70°C)
  • Maximum rated operating temperature +70°C
  • Working temperature from -25°C up to +155°C

The Alpha Electronics FLC precision resistor series have been designed with terminals that are easy for insertion into the PCB.

The FLC series has a pin pitch of 5.08 ±0.25mm.

Alpha's Bulk Metal® foil resistor technology means that these conformally coated, through-hole, precision resistors are ideal for precision measurements, also their low inductance makes them ideal for use at higher frequencies.

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

Alpha FLC Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring at the point 2.5 ±1.0mm below the shoulder of the leads

£0.00 Ex Tax: £0.00

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 HC Series

The HC resistor series from Alpha Electronics offers their ultra-precision resistor capabilities in a hermetically sealed package. With a resistance range from 1Ω up to 120kΩ all in a small through-hole package with a pin pitch of 3.81 ±0.25mm. By utilising Alpha's Bulk Metal® foil resistor technology, they are able to produce resistors with low temperature coefficients and excellent long-term stability.

  • Ultra-precision hermetically sealed resistor
  • Available in any resistance between 1Ω and 120kΩ
  • Through-hole package with a pin pitch of 3.81 ±0.25mm
  • Tight tolerance options as low as ±0.005% available for resistances between 30Ω and 120kΩ
  • Tight TCR options available of ±1 ppm/°C (from 0°C up to +65°C, between 30Ω and 120kΩ) or ±2.5 ppm/°C (from -55°C up to +125°C, between 30Ω and 120kΩ)
  • Maximum working voltage of 300V
  • Power rating of 0.3W (at +125°C)
  • Maximum rated operating temperature +125°C
  • Working temperature from -65°C up to +150°C

The Alpha Electronics HC hermetically sealed ultra-precision resistor series have been designed with longer leads to ensure the correct clearance from the PCB is achieved when soldering. It is advised that the resistors are kept over 10mm away from the board surface by using an insulating tube.


The below table gives a summary of the specifications available for each resistor model including the Alpha HC series:

Alpha HC Specifications

* Symbols parenthesized are for part number composition
✝ Resistance figures are the values obtained by measuring the leads at point 12.7 ±3.2mm away from the base for type HC and HD, but, in case of resistance below 10Ω, the value at 1.6 ±0.6mm away from the base for all types
** Temperature characteristic Z is applicable for temperature range between 0°C and +60°C

£0.00 Ex Tax: £0.00