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. 709-5664
Mfr. Part No.AD5161BRMZ50
TWD58
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 50kΩ 256 - Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 145-6195
Mfr. Part No.AD5161BRMZ50
TWD42
Each (In a Tube of 50)
units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 50kΩ 256 - Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 160-9980
Mfr. Part No.AD8400ARZ10
TWD78
Each (In a Tube of 98)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 230-703
Mfr. Part No.AD8400ARZ10
TWD98
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 724-0362
Mfr. Part No.MCP4011-103E/MS
BrandMicrochip
TWD21
Each (In a Pack of 5)
units
Serial-2 Wire 10kΩ 64 Linear Volatile 1 Surface Mount MSOP 8 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS Stock No. 806-5327
Mfr. Part No.AD5291BRUZ-20
TWD232
Each (In a Pack of 2)
units
Serial-SPI 20kΩ 256 - 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. 812-0240
Mfr. Part No.TPL0501-100DCNR
TWD55
Each (In a Pack of 10)
units
Serial-3 Wire, Serial-SPI 120kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.75 x 1.3mm 1.3mm
RS Stock No. 165-2114
Mfr. Part No.MCP41HV31-503E/ST
BrandMicrochip
TWD47
Each (In a Tube of 96)
units
Serial-SPI 50kΩ 128 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 36 V ±18V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 799-0247
Mfr. Part No.MCP41HV31-503E/ST
BrandMicrochip
TWD43
Each (In a Pack of 4)
units
Serial-SPI 50kΩ 128 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 36 V ±18V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 162-7884
Mfr. Part No.TPL0501-100DCNR
TWD45
Each (On a Reel of 3000)
units
Serial-3 Wire, Serial-SPI 120kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.75 x 1.3mm 1.3mm
RS Stock No. 160-1646
Mfr. Part No.AD5291BRUZ-20
TWD155
Each (In a Tube of 96)
units
Serial-SPI 20kΩ 256 - 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. 799-7667
Mfr. Part No.MAX5387MAUD+
BrandMaxim
TWD61
Each (In a Pack of 2)
units
Serial-I2C 50kΩ 256 Linear Volatile 2 Surface Mount TSSOP 14 Single 2.6 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 738-6109
Mfr. Part No.MCP4011-502E/SN
BrandMicrochip
TWD16
Each (In a Pack of 5)
units
Serial-2 Wire 5kΩ 64 - Volatile - Surface Mount SOIC 8 Single 2.5 V, 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 403-733
Mfr. Part No.MCP42010-E/SL
BrandMicrochip
TWD73
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 256 Linear - 2 Surface Mount SOIC 14 Single 3.3 V, 5 V - 8.65 x 3.9 x 1.25mm 1.25mm
RS Stock No. 819-5626
Mfr. Part No.MCP42010-I/SL
BrandMicrochip
TWD54
Each (In a Tube of 57)
units
SPI 12kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 2.7 → 5.5 V - 8.81 x 3.99 x 1.55mm 1.55mm
RS Stock No. 823-7910
Mfr. Part No.MCP4641T-502E/ML
BrandMicrochip
TWD35
Each (In a Pack of 10)
units
Serial-I2C 5kΩ 129 - Non-Volatile 2 Surface Mount QFN 16 Single 2.7 → 5.5 V - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 146-0293
Mfr. Part No.MCP45HV51-503E/ST
BrandMicrochip
TWD44
Each (In a Tube of 96)
units
Serial-I2C 50kΩ 256 Linear Volatile 1 Surface Mount TSSOP 14 Single 1.8 → 5.5 (Digital) V, 10 → 36 (Analogue) V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 829-0554
Mfr. Part No.MCP45HV51-503E/ST
BrandMicrochip
TWD49
Each (In a Pack of 5)
units
Serial-I2C 50kΩ 256 Linear Volatile 1 Surface Mount TSSOP 14 Single 1.8 → 5.5 (Digital) V, 10 → 36 (Analogue) V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 165-3386
Mfr. Part No.MCP40D18T-503E/LT
BrandMicrochip
TWD16
Each (On a Reel of 3000)
units
Serial-I2C 50kΩ 128 Linear Volatile 1 Surface Mount SC-70 6 Single 1.8 → 5.5 V - 2 x 1.25 x 1mm 1mm
RS Stock No. 669-6379
Mfr. Part No.MCP42050-I/SL
BrandMicrochip
TWD68
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 256 Linear - 2 Surface Mount SOIC 14 Single 3.3 V, 5 V - 8.65 x 3.9 x 1.25mm 1.25mm