Conductive Plastic Potentiometers

These potentiometers have several advantages and special features compared to other resistance elements

Guide for Conductive Plastic Potentiometers

Conductive Plastic Potentiometers

Conductive plastic potentiometers offer an almost infinite resolution for angles up to max. 355° at max. 400 rpm thanks to the very smooth resistance track. In addition, they achieve top levels of lifetime and quality and provide an absolute, analogue output signal without steps.

In terms of design, the portfolio ranges from miniaturized, extremely compact conductive plastic potentiometers with a minimum installation depth of < 8 mm to completely sealed housings with protection class IP65. And yet there are applications that require additional technical product adaptation.

MEGATRON is your specialist for these matters. Within the scope of our consultation we define with you the optimal product for your "design in". With high delivery reliability and assured quality products, we focus on long-term partnerships and accompany you throughout the entire service life of your application.


Guide for Conductive Plastic Potentiometers
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Resistance element and resolution

Conductive plastic potentiometers have a conductive plastic resistance element, from which the name for these potentiometers is derived. There is a conductive plastic layer on a carrier material. These layers are extremely smooth, mirror-like resistance tracks. In the application, these potentiometers provide a continuous signal without steps, have a quasi-infinite resolution and enable a very long lifespan of ≥50 million revolutions. Furthermore, conductive plastic potentiometers achieve excellent independent linearities of up to 0.02%. Conductive plastic potentiometers, which are manufactured in a "co-molded" production process, have an additional advantage: the adjacent connection transitions to the resistor track are manufactured very precisely, so that the wiper is much less worn when passing over the ends of the resistor track.

Conductive Plastic Element


Circuit type

Conductive plastic potentiometers must never be used as variable resistors (rheostats), but only in voltage divider circuits. Otherwise, the resistor element will be damaged. Potentiometers generally show their strengths in voltage divider circuits. Temperature has hardly any influence on the output signal, because the tapped voltage at the slider or the electrical potential at the output remains largely unaffected here, since the divider ratio does not change.


Load capacity of the resistance element

Example Voltage U Resistance R Power P Application possible?
1 20 V 1 kΩ 0.4 Watt yes
2 30 V 1 kΩ 0.9 Watt yes
3 50 V 1 kΩ 2.5 Watt no
4 100 V 5 kΩ 2 Watt no
5 100 V 10 kΩ 1 Watt yes

Example MPA20/21 series

  • available resistance values (0.5..100 kΩ) 1, 2, 5, 10, 50 kΩ
  • max. load capacity 1 Watt

The following applies to power loss:
P = U² / R (power P = voltage U² / resistance R)

On the basis of this calculation example it is immediately apparent that at an operating voltage of 50 V the potentiometer with 1 kΩ cannot be used. Because otherwise the power with which the resistance element is loaded is too high.  Please also take into account the additional restrictions for the ambient temperature.

Please note that very high-resistance conductive plastic versions have a less favorable slider contact resistance, as the latter also increases if the conductive plastic layer itself has a higher resistance.


Resistance elements in comparison

Resistive elementConductive PlasticWirewoundHybrid
Lifespan++0+
Signal quality / resolution+++++++
Linearity+++++++
Electrical travelmax. 360°10800°max. 3600°
Operational speed++-++
Max. wiper current-+-
Shock / Vibration-----

Legend: +++ best | ++ very good | + good | 0 OK | - low | -- unfavourable | --- not appropriate


Decision support

The choice of the right potentiometer technology depends on various factors. If your application places high demands on lifespan and tight linearity tolerances, conductive plastic technology is a good choice for singleturn applications. Conductive plastic offers the highest lifespan with up to 50 million shaft revolutions and best values in linearity with up to 0.02% tolerance in very compact designs (e.g. MCP22). Thanks to the very smooth resistive track and very low signal noise, almost infinite resolution is achieved. In addition, the design allows adjustment speeds of up to 400 rpm.

Please note, however, that conductive plastic potentiometers are not available as helical multiturn potentiometers. Conductive plastic potentiometers must be connected in voltage divider circuit and the wiper current must be limited to a minimum.

Comparison between conductive plastic and wirewound potentiometers

If you compare conductive plastic with wirewound potentiometers, it is important to mention that the tolerance of the total resistance of conductive plastic potentiometers is generally somewhat larger than that of wirewound potentiometers. Since the application must always be in the voltage divider circuit, this tolerance is not relevant for the useful signal. However, if the power dissipation of an electrical circuit must be known exactly, these tolerance should be taken into account.

On the other hand, wirewound potentiometers "tolerate" slightly higher current values than conductive plastic potentiometers, have excellent resistance tolerance values and very good linearity values. However, the surface of the resistive element is somewhat rougher due to its design and generates noticeable small steps in the output signal. The wiper is also subjected to greater stress due to the resistor design, which has an effect on the lifespan and in many cases is significantly below that of conductive plastic potentiometers.

Hybrid potentiometers are for multiturn tasks

If similar values of conductive plastic potentiometers are required for multiturn tasks ≥360°, they are found in our hybrid potentiometers. In wich a wirewound resistor track is coated with conductive plastic. This protects the wiper and also enables a smooth output signal, almost infinite resolution and higher adjustment speeds.

Conductive plastic potentiometers in tandem designs
Conductive plastic potentiometers can also be equipped like wirewound or hybrid potentiometers in tandem design. What you have to consider, you can find here.


Product customizations

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20 results found
Conductive Plastic Potentiometer-MP20
Conductive Plastic Potentiometer MP20/21
Economical and compact precision potentiometer in Ø22 mm housing with long lifespan and many options
  • Economical and compact sensor with low installation depth of 12 mm
  • Long lifespan and high accuracy
  • With or without mechanical end stop (320° / 360°)
  • Optional tandem version
Conductive Plastic Potentiometer-MP22_23
Conductive Plastic Potentiometer MP22/23
Conductive plastic potentiometer with high durability in Ø22 mm metal housing and low installation depth with axial connections
  • High durability and accuracy
  • Robust metal housing
  • With or without mechanical end stop (320° / 360°)
  • High-end stop torque 90 Ncm (version with end stop)
  • Axially aligned connections
  • Compact sensor with low installation depth 12 mm
Conductive Plastic Potentiometer-MPA20_21
Conductive Plastic Potentiometer MPA20/21
Durable and accurate precision potentiometer in Ø22 mm housing and low installation depth
  • High durability and accuracy
  • Electrical effective angle of rotation up to 340°
  • Housing depth only 10.6 mm
  • Axially aligned ports
  • With or without mechanical end stop (320°/360°)
Conductive Plastic Potentiometer-MPAS20_21
Conductive Plastic Potentiometer MPAS20
Highly durable servo flange precision potentiometer in Ø22 mm housing
  • High durability and accuracy
  • Servo flange for precise mounting
  • Shaft Ø3.17 mm
  • Axially aligned connections
  • 2 precision ball bearings
Conductive Plastic Potentiometer-MPS20_21
Conductive plastic potentiometer MPS20
Compact servo flange potentiometer in Ø22 mm housing with radial connections - durable and accurate
  • High durability and accuracy
  • Compact sensor
  • Servo flange for precise mounting
  • 2 x ball bearings
  • Optional center tap
Conductive Plastic Hollow Shaft Potentiomter-MHP32
Conductive Plastic Potentiometer with hollow shaft MHP32
Conductive plastic hollow-shaft potentiometer with backlash-free coupling for convenient installation
  • High quality conductive plastic element and multi-finger slider    
  • Compact, space-saving housing design (ø32 x 8 mm)
  • Fast and easy installation
  • Easy, back-lash free coupling
Conductive Plastic Hollow Shaft Potentiometer MHP24
Hollow-shaft conductive plastic potentiometer MHP24
Very compact hollow-shaft potentiometer with a precious metal wiper suitable for very confined spaces
  • Space-saving flat housing (Ø24 x 7.1 mm)
  • Simple mounting on flatted hollow shaft hub and anti rotation pin
  • Conductive plastic and high-quality multi finger wiper (precious metals) gives a reliable signal output
Potentiometer-MHP16
Conductive plastic potentiometer MHP16 with hollow shaft
Miniaturized hollow shaft potentiometer suitable for very thin shafts (Ø2) and tight installation conditions
  • Extremely compact housing design (ø16.4 x 6 mm)
  • Stable output signal thanks to high-quality conductive plastic resistance element and multi-finger wiper (precious metal)
  • Flattened hollow shaft and flange allow easy mounting
Conductive Plastic potentiometer-MCP05
Conductive Plastic Potentiometer MCP05
Miniature potentiometer with servo flange, 2 ball bearings and long lifespan in Ø13 mm housing
  • Very durable sensor with over 10 million movements
  • Ideal in confined spaces
  • Servo flange for precise mounting
  • Applicable in a wide range of temperatures
  • Axial pin alignment
  • 2 precision ball bearings
  • Optional rear shaft
Conductive Plastic potentiometer-MCP22
Conductive Plastic Potentiometer MCP22
The most compact high-resolution potentiometer with the highest lifespan - in this combination in our portfolio in Ø22 mm housing
  • The most compact and durable potentiometer in our portfolio
  • Excellent lifetime with over 50 million shaft movements
  • Applicable in a wide range of temperatures
  • Ø22 mm rugged metal housing
  • Very good linearity
  • Tandem with up to 5 gangs possible
  • Servo flange for precise mounting
  • 2 precision ball bearings
Conductive Plastic potentiometer-MCP30
Conductive Plastic Potentiometer MCP30
High-resolution precision potentiometer with servo flange, good linearity and excellent lifespan in Ø27 mm metal housing
  • Highest lifespan
  • Extremely precise sensor
  • Applicable in wide temperature range
  • Servo flange for precise mounting
  • 2 precision ball bearings
  • Shaft with only Ø3 mm
  • Robust metal housing
Conductive Plastic potentiometer MCP40
Conductive Plastic Potentiometer MCP40
High-resolution precision potentiometer with servo flange, excellent linearity and lifespan and high resistance value in Ø36.5 mm metal housing
  • Very long lifespan
  • Very precise sensor
  • High max. resistance value - Power-saving in applications
  • Servo flange for precise mounting
  • 2 precision ball bearings
  • Can be used in a wide temperature range
  • Optional tandem version
Conductive Plastic Potentiometer-MCP50
Conductive Plastic Potentiometer MCP50
High resolution precision potentiometer with excellent linearity and lifespan, very high resistance value and high electrically effective rotation angle in Ø51 mm housing
  • Highest lifetime
  • Extremely precise sensor
  • High electrically effective angle of rotation 350° ±5°
  • Servo flange for precise mounting
  • 2 precision ball bearings in robust metal housing
  • Applicable in wide temperature range
  • Very high max. resistance value - power saving in applications
Conductive Plastic Potentiometer-MFP500
Conductive Plastic Potentiometer MFP500
The potentiometer for the highest IP protection, linearity and lifespan requirements in rugged Ø50.8 mm industrial design
  • Completely sealed housing in IP65 and very long lifespan
  • Achieves the highest linearity requirements with up to ±0.05%
  • Very high electrically effective angle of rotation 355° ±2°
  • Application in a wide range of temperatures
  • 2 servo flange variants for precise mounting
  • Robust metal housing
  • With connector
Conductive Plastic Potentiometer-MP10_11
Conductive Plastic Potentiometer MP10/11
Durable miniature precision potentiometer in Ø13 mm metal housing with optional rear shaft
  • Miniature housing with Ø13 mm
  • Ideal for confined spaces
  • With or without mechanical end stop (310° / 360°)
  • Lifespan 5 million movements
  • Robust metal housing
  • Optional back facing shaft
Conductive Plastic Potentiometer-SFCP22
Conductive plastic potentiometer SFCP22
Robust servo flange potentiometer in Ø22 mm metal housing with very long lifespan
  • Very long lifespan 20 mio. rotations
  • High accuracy
  • Compact sensor
  • 2 x ball bearings
  • Optional rear shaft, center tap
Conductive Plastic potentiometer-oilfilled-OMCP
Oil-filled Conductiv Plastic Potentiometer OMCP
Oil-filled conductive plastic potentiometer in Ø32 mm housing with high durability
  • Oil-filled conductive plastic potentiometer
  • Very high lifespan
  • Optional center tap
Conductive Plastic Potentiometer-SCX22
SIN-COS Potentiometer SCX22
Compact non-linear potentiometer in Ø22 mm metal housing with very long lifespan and opt. rear shaft
  • Effective electrically angle of rotation 360°
  • Very long lifespan
  • 2 x ball bearings
  • Applicable in a wide temperature range
  • Servo flange for precise mounting
  • Oil-filled on request
  • Optional tandem version (up to 3)
Conductive Plastic Potentiometer-SCX30
SIN-COS Potentiometer SCX30
Precise non-linear potentiometer in Ø27 mm metal housing with very long lifespan and opt. rear shaft
  • Effective electrically angle of rotation 360°
  • Very long lifespan
  • 2 x ball bearings
  • Applicable in a wide temperature range
  • Servo flange for precise mounting
  • High resistance versions possible
  • Optional tandem version (up to 3)
Conductive Plastic Potentiometer-SCX50
SIN-COS Potentiometer SCX50
Very precise non-linear potentiometer in Ø51 mm metal housing with very long lifespan and opt. rear shaft
  • Effective electrically angle of rotation 360°
  • Highest durability
  • 2 x ball bearings
  • Applicable in a wide temperature range
  • Servo flange for precise mounting
  • High resistance versions possible
  • Optional tandem version (up to 3)
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