Digital Potentiometers

Digital Potentiometers are three-terminal devices, two fixed end terminals and one wiper terminal which are used to vary resistance.

What is a Digital potentiometer?

A digital potentiometer also known as a digipot, is similar to a standard analogue potentiometer, which is a variable type resistor except the digital potentiometer has an IC (integrated circuit) that can take a signal input rather. 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 vulnerable 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. 921-5848
Mfr. Part No.X9C102PZ
£4.87
Each (In a Pack of 2)
Units
Serial-3 Wire 1kΩ 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. 758-9601
Mfr. Part No.AD5293BRUZ-20
£5.14
Each
Units
Serial-SPI 20kΩ 1024 Linear Volatile - Surface Mount TSSOP 14 Dual, Single 9 to 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.2mm 1.2mm
RS Stock No. 497-0745
Mfr. Part No.AD5235BRUZ25
£8.02
Each
Units
Serial-2 Wire, Serial-I2C 25kΩ 1024 Linear, Log Non-Volatile 2 Surface Mount TSSOP 16 Dual, Single 3.3 V, 5 V ±2.5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 806-5298
Mfr. Part No.AD5175BRMZ-10
£3.02
Each (In a Pack of 2)
Units
Serial-3 Wire, Serial-I2C 10kΩ 1024 - Non-Volatile 1 Surface Mount MSOP 10 Dual, Single 2.7 to 5.5 V ±2.5 → ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 538-7778
Mfr. Part No.AD5242BRUZ1M
£2.62
Each
Units
Serial-2 Wire, Serial-I2C 1000kΩ 256 - Volatile 2 Surface Mount TSSOP 16 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 709-5718
Mfr. Part No.AD5206BRUZ10
£4.04
Each
Units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 6 Surface Mount TSSOP 24 Dual, Single 3 V, 5 V ±2.5V 7.8 x 4.4 x 1.05mm 1.05mm
RS Stock No. 809-9301
Mfr. Part No.AD5171BRJZ10-R2
£2.596
Each (On a Tape of 5)
Units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 to 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 759-0727
Mfr. Part No.AD5293BRUZ-100
£4.99
Each
Units
Serial-SPI 100kΩ 1024 Linear Volatile - Surface Mount TSSOP 14 Dual, Single 9 to 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.2mm 1.2mm
RS Stock No. 145-7199
Mfr. Part No.AD5171BRJZ10-R2
£1.627
Each (On a Reel of 250)
Units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 to 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 160-3302
Mfr. Part No.AD5228BUJZ10-RL7
£0.477
Each (On a Reel of 3000)
Units
Up/Down 100kΩ 32 Linear - 1 Surface Mount TSOT 8 Single 2.7 to 5.5 V - 2.9 x 1.6 x 0.9mm 0.9mm
RS Stock No. 759-0724
Mfr. Part No.AD5292BRUZ-20
£5.30
Each
Units
Serial-SPI 20kΩ 1024 Linear Non-Volatile - Surface Mount TSSOP 14 Dual, Single 9 to 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.2mm 1.2mm
RS Stock No. 914-0251
Mfr. Part No.AD5228BUJZ10-RL7
£0.988
Each (In a Pack of 5)
Units
Up/Down 100kΩ 32 Linear - 1 Surface Mount TSOT 8 Single 2.7 to 5.5 V - 2.9 x 1.6 x 0.9mm 0.9mm
RS Stock No. 160-4482
Mfr. Part No.AD5171BRJZ5-R2
£1.741
Each (On a Reel of 250)
Units
I2C, Serial-2 Wire 5kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 to 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 687-8474
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
£0.41
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. 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. 888-4840
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
£0.297
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. 159-6627
Mfr. Part No.MCP41050-I/SN
BrandMicrochip
£0.898
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
£2.59
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. 178-4878
Mfr. Part No.MCP4251-104E/P
BrandMicrochip
£0.595
Each (In a Tube of 30)
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. 669-6363
Mfr. Part No.MCP41050-I/SN
BrandMicrochip
£1.144
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