Digital Potentiometers

What is a Digital potentiometer?
Digital Potentiometers are a three terminal device, two fixed end terminals and one wiper terminal which is used to vary the resistance.
A Digital potentiometer also known as digipot, is similar to a standard analogue potentiometer, which is a variable resistor except the digital potentiometer has an integrated chip (IC) that accepts a signal input rather than the physical movement of a shaft or slide for adjustment. Potentiometers physically change the resistance value whereas digital potentiometers modify the resistance value via digital inputs rather than a rotary wheel or a slider.
Where might I use one?
Digital potentiometers would be beneficial where environmental factors would impact a mechanical potentiometer in areas where there is vibration, dust, moisture or grease as digital potentiometers are encapsulated they offer better protection, they are also less vunerable to vibration Digital potentiometers are used to calibrate system tolerances or control system parameters.

What are the advantages over a mechanical potentiometer?
Digital potentiometers can be operated in a closed control loop and don’t need physical access to be adjusted. . They offer better stability and reliability and as digital will offer additional functionality, some even have on - chip memory
Applications
• System calibration
• Process control
• Sensor calibration
• Smart actuator
• Voltage margining
• Programmable power supplies
• Volume control

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Description Price Control Interface Resistance Value Number of Positions Taper Type Memory Type Number of Pots per Package Mounting Type Package Type Pin Count Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Dimensions Height
RS stock no. 821-3021
Mfr. Part No.CAT5114LI-50-G
R 27.848
Each (In a Pack of 5)
units
Up/Down 50kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 821-3024
Mfr. Part No.CAT5114LI-00-G
R 27.038
Each (In a Pack of 5)
units
Up/Down 100kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 821-3015
Mfr. Part No.CAT5113LI-50-G
R 43.064
Each (In a Pack of 5)
units
Up/Down 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 821-3009
Mfr. Part No.CAT5110SDI-50GT3
R 8.982
Each (In a Pack of 10)
units
Serial-2 Wire 60kΩ 32 Linear - 1 Surface Mount SC-70 6 Single 2.7 → 5.5 V - 2.2 x 1.35 x 1mm 1mm
RS stock no. 145-3237
Mfr. Part No.CAT5113LI-50-G
R 24.397
Each (In a Tube of 50)
units
Up/Down 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 163-0428
Mfr. Part No.CAT5110SDI-50GT3
R 8.905
Each (On a Reel of 3000)
units
Serial-2 Wire 60kΩ 32 Linear - 1 Surface Mount SC-70 6 Single 2.7 → 5.5 V - 2.2 x 1.35 x 1mm 1mm
RS stock no. 163-0431
Mfr. Part No.CAT5114LI-50-G
R 21.061
Each (In a Tube of 50)
units
Up/Down 50kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 821-3011
Mfr. Part No.CAT5113LI-10-G
R 32.68
Each (In a Pack of 5)
units
Up/Down 10kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS stock no. 145-3701
Mfr. Part No.CAT5114LI-00-G
R 20.889
Each (In a Tube of 50)
units
Up/Down 100kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm