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. 687-8474
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
£0.42
Each
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. 888-4840
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
£0.321
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. 669-6363
Mfr. Part No.MCP41050-I/SN
BrandMicrochip
£1.118
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. 723-9731
Mfr. Part No.MCP4251-104E/P
BrandMicrochip
£0.78
Each (In a Pack of 2)
Units
Serial-SPI 100kΩ 257 Linear 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. 923-5511
Mfr. Part No.DS1804Z-010+
BrandMaxim
£1.735
Each (In a Tube of 100)
Units
Increment/Decrement 10kΩ 100 Linear Non-Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 178-4878
Mfr. Part No.MCP4251-104E/P
BrandMicrochip
£0.639
Each (In a Tube of 30)
Units
Serial-SPI 100kΩ 257 Linear Volatile 2 Through Hole PDIP 14 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 761-7854
Mfr. Part No.DS1804Z-010+T&R
BrandMaxim
£2.58
Each
Units
Increment 10kΩ 100 Linear Non-Volatile 1 Surface Mount SMT 8 Single 5 V - 9.91 x 7.87 x 4.45mm 4.45mm
RS Stock No. 159-6627
Mfr. Part No.MCP41050-I/SN
BrandMicrochip
£0.828
Each (In a Tube of 100)
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. 523-6816
Mfr. Part No.AD5220BNZ10
£2.75
Each
Units
Serial-3 Wire 10kΩ 128 - Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.27 x 7.24 x 3.43mm 3.43mm
RS Stock No. 160-1642
Mfr. Part No.AD5272BRMZ-20
£2.695
Each (In a Tube of 50)
Units
Serial-3 Wire, Serial-I2C 20kΩ 1024 - Non-Volatile 1 Surface Mount MSOP 10 Dual, Single 2.7 → 5.5 V ±2.5 → ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 850-7754
Mfr. Part No.AD5141BCPZ100-RL7
£2.02
Each (In a Pack of 2)
Units
Serial-I2C, Serial-SPI 100kΩ 256 Log 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. 806-5311
Mfr. Part No.AD5272BRMZ-20
£3.52
Each (In a Pack of 2)
Units
Serial-3 Wire, Serial-I2C 20kΩ 1024 - Non-Volatile 1 Surface Mount MSOP 10 Dual, Single 2.7 → 5.5 V ±2.5 → ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 496-8916
Mfr. Part No.AD5263BRUZ20
£5.64
Each
Units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 20kΩ 256 Linear Volatile 4 Surface Mount TSSOP 24 Dual, Single 5 V ±5V 7.8 x 4.4 x 1.05mm 1.05mm
RS Stock No. 106-7037
Mfr. Part No.AD5263BRUZ20
£4.488
Each (In a Tube of 62)
Units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 20kΩ 256 Linear Volatile 4 Surface Mount TSSOP 24 Dual, Single 5 V ±5V 7.8 x 4.4 x 1.05mm 1.05mm
RS Stock No. 160-9911
Mfr. Part No.AD5141BCPZ100-RL7
£1.01
Each (On a Reel of 1500)
Units
Serial-I2C, Serial-SPI 100kΩ 256 Log 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. 165-9567
Mfr. Part No.DS1845E-050+
BrandMaxim
£2.869
Each (In a Tube of 96)
Units
Serial-3 Wire, Serial-I2C 50kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
£1.224
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
£1.00
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. 732-9711
Mfr. Part No.MAX5481EUD+
BrandMaxim
£3.09
Each
Units
Serial-SPI 10kΩ 1024 Linear Non-Volatile 1 Surface Mount TSSOP 14 Dual, Single 5.25 V ±2.5V 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 170-8170
Mfr. Part No.X9C103SZ
£3.205
Each (In a Tube of 100)
Units
Serial-3 Wire 10kΩ 100 Linear Non-Volatile 1 Surface Mount SOIC 8 Single 5 V - 5 x 4 x 1.5mm 1.5mm
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