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. 159-7405
Mfr. Part No.MCP4151-103E/P
BrandMicrochip
R 13.279
Each (In a Tube of 60)
units
Serial-SPI 10kΩ 257 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS stock no. 723-9930
Mfr. Part No.MCP4151-103E/P
BrandMicrochip
R 22.56
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 257 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS stock no. 921-5535
Mfr. Part No.X9C503PZ
R 88.82
Each (In a Pack of 2)
units
Serial-3 Wire 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 5 V - 9.56 x 6.35 x 3.3mm 3.3mm
RS stock no. 146-2404
Mfr. Part No.X9C503PZ
R 78.883
Each (In a Tube of 50)
units
Serial-3 Wire 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 5 V - 9.56 x 6.35 x 3.3mm 3.3mm
RS stock no. 165-1986
Mfr. Part No.MCP4451-103E/ST
BrandMicrochip
R 19.472
Each (In a Tube of 74)
units
Serial-SPI 10kΩ 256 Linear - 2 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS stock no. 823-4273
Mfr. Part No.MCP4451-103E/ST
BrandMicrochip
R 23.292
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 256 Linear - 2 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS stock no. 669-6430
Mfr. Part No.MCP4641-103E/ST
BrandMicrochip
R 18.872
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-I2C 10kΩ 128 - Non-Volatile 2 Surface Mount TSSOP 14 Single 2.5 V, 3.3 V, 5 V - 5 x 4.4 x 1mm 1mm
RS stock no. 159-6629
Mfr. Part No.MCP4641-103E/ST
BrandMicrochip
R 15.217
Each (In a Tube of 96)
units
Serial-2 Wire, Serial-I2C 10kΩ 128 - Non-Volatile 2 Surface Mount TSSOP 14 Single 2.5 V, 3.3 V, 5 V - 5 x 4.4 x 1mm 1mm
RS stock no. 738-6972
Mfr. Part No.MCP4131-503E/P
BrandMicrochip
R 12.06
Each (In a Pack of 5)
units
Serial-SPI 50kΩ 129 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS stock no. 145-8990
Mfr. Part No.MCP4131-503E/P
BrandMicrochip
R 9.741
Each (In a Tube of 60)
units
Serial-SPI 50kΩ 129 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS stock no. 158-5281
Mfr. Part No.AD5206BRZ10
R 74.868
Each (In a Tube of 31)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 6 Surface Mount SOIC W 24 Dual, Single 3 V, 5 V ±2.5V 15.6 x 7.6 x 2.35mm 2.35mm
RS stock no. 759-0711
Mfr. Part No.AD5248BRMZ10
R 44.62
Each
units
Serial-3 Wire 10kΩ 256 Linear Volatile - Surface Mount MSOP 10 Single 2.7 → 5.5 V - 3.1 x 3.1 x 1.1mm 1.1mm
RS stock no. 145-7593
Mfr. Part No.AD5248BRMZ10
R 34.409
Each (In a Tube of 50)
units
Serial-3 Wire 10kΩ 256 Linear Volatile - Surface Mount MSOP 10 Single 2.7 → 5.5 V - 3.1 x 3.1 x 1.1mm 1.1mm
RS stock no. 738-6137
Mfr. Part No.MCP4251-103E/SL
BrandMicrochip
R 16.86
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 257 Linear Volatile 2 Surface Mount SOIC 14 Single 1.8 → 5.5 V - 8.65 x 3.9 x 1.25mm 1.25mm
RS stock no. 709-5724
Mfr. Part No.AD5206BRZ10
R 92.53
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 6 Surface Mount SOIC W 24 Dual, Single 3 V, 5 V ±2.5V 15.6 x 7.6 x 2.35mm 2.35mm
RS stock no. 160-3302
Mfr. Part No.AD5228BUJZ10-RL7
R 10.823
Each (On a Reel of 3000)
units
Up/Down 100kΩ 32 Linear - 1 Surface Mount TSOT 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 0.9mm 0.9mm
RS stock no. 819-7086
Mfr. Part No.AD5171BRJZ100-R2
R 29.376
Each (In a Pack of 5)
units
I2C, Serial-2 Wire 100kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS stock no. 709-4743
Mfr. Part No.AD5243BRMZ50
R 25.67
Each
units
Serial-3 Wire, Serial-I2C 50kΩ 256 - Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS stock no. 912-6564
Mfr. Part No.AD5243BRMZ50
R 25.453
Each (In a Tube of 50)
units
Serial-3 Wire, Serial-I2C 50kΩ 256 - Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS stock no. 914-0251
Mfr. Part No.AD5228BUJZ10-RL7
R 22.498
Each (In a Pack of 5)
units
Up/Down 100kΩ 32 Linear - 1 Surface Mount TSOT 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 0.9mm 0.9mm