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. 168-4105
Mfr. Part No.AD5259BRMZ50
MYR8.59
Each (In a Tube of 50)
units
Serial-I2C 50kΩ 256 - Non-Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 709-5800
Mfr. Part No.AD5259BRMZ50
MYR10.59
Each
units
Serial-I2C 50kΩ 256 - Non-Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 144-9093
Mfr. Part No.MCP41010-E/P
BrandMicrochip
MYR5.528
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. 403-676
Mfr. Part No.MCP41010-E/P
BrandMicrochip
MYR6.34
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. 523-7386
Mfr. Part No.AD8403ARZ10
MYR29.00
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 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. 912-7463
Mfr. Part No.AD8403ARZ10
MYR28.068
Each (In a Tube of 31)
units
Serial-3 Wire, Serial-SPI 10kΩ 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. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
MYR6.466
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. 144-5722
Mfr. Part No.MCP41100-E/P
BrandMicrochip
MYR5.528
Each (In a Tube of 60)
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. 146-0167
Mfr. Part No.MCP4462-503E/ST
BrandMicrochip
MYR6.42
Each (In a Tube of 96)
units
Serial-I2C 50kΩ 257 Linear Non-Volatile 4 Surface Mount TSSOP 14 Single 1.8 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 412-804
Mfr. Part No.AD8402ARZ10
MYR19.51
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 3 V, 5 V - 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 770-7761
Mfr. Part No.MCP41010-I/P
BrandMicrochip
MYR5.85
Each (In a Pack of 6)
units
Serial-SPI 10kΩ 256 Linear Volatile 1 Through Hole PDIP 8 Single 2.7 → 5.5 V - 9.78 x 6.6 x 3.68mm 3.68mm
RS Stock No. 913-0775
Mfr. Part No.AD5252BRUZ1
MYR12.56
Each (In a Tube of 96)
units
Serial-3 Wire, Serial-I2C 1kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
RS Stock No. 412-696
Mfr. Part No.AD5220BRZ10
MYR12.47
Each (In a Pack of 5)
units
Serial-3 Wire 10kΩ 128 - Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 160-1649
Mfr. Part No.AD5292BRUZ-50
MYR21.02
Each (In a Tube of 96)
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. 806-5339
Mfr. Part No.AD5292BRUZ-50
MYR26.42
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. 161-0145
Mfr. Part No.AD5220BRZ10
MYR9.57
Each (In a Tube of 98)
units
Serial-3 Wire 10kΩ 128 - Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 669-6367
Mfr. Part No.MCP42010-I/P
BrandMicrochip
MYR8.71
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 256 Linear - 2 Through Hole PDIP 14 Single 3.3 V, 5 V - 19.05 x 6.35 x 3.3mm 3.3mm
RS Stock No. 726-3980
Mfr. Part No.MCP4462-503E/ST
BrandMicrochip
MYR7.69
Each (In a Pack of 2)
units
Serial-I2C 50kΩ 257 Linear Non-Volatile 4 Surface Mount TSSOP 14 Single 1.8 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 723-9741
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
MYR5.07
Each (In a Pack of 2)
units
Serial-SPI 5kΩ 257 Linear Non-Volatile 2 Through Hole PDIP 14 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 703-7936
Mfr. Part No.MCP4361-103E/ST
BrandMicrochip
MYR7.89
Each
units
Serial-SPI 10kΩ 257 Linear Non-Volatile 1 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm