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. 159-7406
Mfr. Part No.MCP4021-103E/MS
BrandMicrochip
R 10.396
Each (In a Tube of 100)
units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount MSOP 8 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS stock no. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
R 42.408
Each (In a Pack of 5)
units
Serial-SPI 100kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm
RS stock no. 888-4840
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
R 6.531
Each (On a Reel of 3000)
units
Serial-2 Wire, Serial-I2C 10kΩ 128 - Volatile 1 Surface Mount SC-70 6 Single 2.5 V, 3.3 V, 5 V - 2 x 1.25 x 0.9mm 0.9mm
RS stock no. 759-0692
Mfr. Part No.AD5200BRMZ10-REEL7
R 50.80
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 10 Dual, Single 2.7 → 5.5 V ±2.7V 3.15 x 3.15 x 0.97mm 0.97mm
RS stock no. 758-9594
Mfr. Part No.AD5220BRMZ100
R 54.78
Each
units
Serial-3 Wire 100kΩ 128 Linear Volatile - Surface Mount MSOP 8 Single 2.7 → 5.5 V - 3.2 x 3.2 x 1.1mm 1.1mm
RS stock no. 709-7143
Mfr. Part No.AD8403ARZ50
R 126.31
Each
units
Serial-3 Wire, Serial-SPI 50kΩ 256 Linear Volatile 4 Surface Mount SOIC W 24 Single 3 V, 5 V - 15.6 x 7.6 x 2.35mm 2.35mm
RS stock no. 806-5339
Mfr. Part No.AD5292BRUZ-50
R 118.55
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 1024 - Non-Volatile 1 Surface Mount TSSOP 14 Dual, Single 9 → 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.05mm 1.05mm
RS stock no. 796-8880
Mfr. Part No.AD5111BCPZ10-500R7
R 37.90
Each (In a Pack of 5)
units
Up/Down 10kΩ 128 Linear Non-Volatile 1 Surface Mount LFCSP 8 Single 2.3 → 5.5 V - 2 x 2 x 0.55mm 0.55mm
RS stock no. 724-0450
Mfr. Part No.MCP4021-103E/MS
BrandMicrochip
R 14.176
Each (In a Pack of 5)
units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount MSOP 8 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS stock no. 168-4166
Mfr. Part No.AD5200BRMZ10-REEL7
R 28.503
Each (On a Reel of 1000)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 10 Dual, Single 2.7 → 5.5 V ±2.7V 3.15 x 3.15 x 0.97mm 0.97mm
RS stock no. 669-6363
Mfr. Part No.MCP41050-I/SN
BrandMicrochip
R 24.978
Each (In a Pack of 5)
units
Serial-SPI 50kΩ 256 Linear - 1 Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS stock no. 403-676
Mfr. Part No.MCP41010-E/P
BrandMicrochip
R 27.398
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm
RS stock no. 497-2606
Mfr. Part No.AD5200BRMZ10
R 51.34
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-I2C 10kΩ 256 Linear Volatile 1 Surface Mount MSOP 10 Dual, Single 3 V, 5 V ±2.5V 3 x 3 x 0.85mm 0.85mm
RS stock no. 403-660
Mfr. Part No.MCP41050-E/P
BrandMicrochip
R 27.038
Each (In a Pack of 5)
units
Serial-SPI 50kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm
RS stock no. 889-5878
Mfr. Part No.MCP41010-I/SN
BrandMicrochip
R 21.221
Each (In a Tube of 100)
units
Serial-SPI 10kΩ 256 Linear - 1 Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS stock no. 159-9335
Mfr. Part No.AD5111BCPZ10-500R7
R 21.796
Each (On a Reel of 500)
units
Up/Down 10kΩ 128 Linear Non-Volatile 1 Surface Mount LFCSP 8 Single 2.3 → 5.5 V - 2 x 2 x 0.55mm 0.55mm
RS stock no. 144-9093
Mfr. Part No.MCP41010-E/P
BrandMicrochip
R 22.322
Each (In a Tube of 60)
units
Serial-SPI 10kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm
RS stock no. 145-6430
Mfr. Part No.AD5121BCPZ10-RL7
R 17.931
Each (On a Reel of 1500)
units
Serial-3 Wire, Serial-I2C 10kΩ 128 Linear Non-Volatile 1 Surface Mount LFCSP 16 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 3.1 x 3.1 x 0.75mm 0.75mm
RS stock no. 912-7246
Mfr. Part No.AD8400ARZ1
R 42.288
Each (In a Tube of 98)
units
Serial-3 Wire, Serial-SPI 1kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS stock no. 144-9092
Mfr. Part No.MCP41050-E/P
BrandMicrochip
R 21.582
Each (In a Tube of 60)
units
Serial-SPI 50kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm