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. 177-0549
Mfr. Part No.MCP4261-502E/ST
HK$10.65
Each (In a Pack of 10)
units
SPI 100kΩ 129 - Non-Volatile 2 Surface Mount TSSOP 14 Single Maximum of 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 177-0568
Mfr. Part No.MCP4451-503E/ST
HK$11.85
Each (In a Pack of 5)
units
Serial-I2C 50kΩ 257 Linear Volatile 4 Surface Mount TSSOP 20 Single Maximum of 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 177-2861
Mfr. Part No.MCP4661T-502E/ML
HK$8.341
Each (On a Reel of 3300)
units
I2C 5kΩ 257 Log Non-Volatile 2 Surface Mount QFN 16 Single - - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 177-0295
Mfr. Part No.MCP4261-502E/ST
HK$8.328
Each (In a Tube of 96)
units
SPI 100kΩ 129 - Non-Volatile 2 Surface Mount TSSOP 14 Single Maximum of 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 177-0296
Mfr. Part No.MCP4451-503E/ST
HK$9.173
Each (In a Tube of 74)
units
Serial-I2C 100kΩ 257 Linear Volatile 4 Surface Mount TSSOP 20 Single Maximum of 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 177-0588
Mfr. Part No.MCP45HV51-103E/MQ
HK$13.30
Each (In a Pack of 5)
units
Serial-I2C 100kΩ 256 Linear Volatile 1 Surface Mount QFN 20 Dual 1.5 V 3.5V 5 x 5 x 0.95mm 0.95mm
RS Stock No. 177-0297
Mfr. Part No.MCP45HV51-103E/MQ
HK$10.259
Each (In a Tube of 73)
units
Serial-I2C 100kΩ 256 Linear Volatile 1 Surface Mount QFN 20 Dual 1.5 V 3.5V 5 x 5 x 0.95mm 0.95mm
RS Stock No. 177-3388
Mfr. Part No.MCP4661T-502E/ML
HK$11.08
Each (In a Pack of 10)
units
I2C 5kΩ 257 Log Non-Volatile 2 Surface Mount QFN 16 Single - - 4 x 4 x 0.95mm 0.95mm