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. 850-7754
Mfr. Part No.AD5141BCPZ100-RL7
£1.90
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 to 5.5 V ±2.25 → ±2.75V 3.1 x 3.1 x 0.75mm 0.75mm
RS Stock No. 496-8916
Mfr. Part No.AD5263BRUZ20
£5.50
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. 165-9567
Mfr. Part No.DS1845E-050+
£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 to 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 160-9911
Mfr. Part No.AD5141BCPZ100-RL7
£1.036
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 to 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
£3.30
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 to 5.5 V ±2.5 → ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 144-5722
Mfr. Part No.MCP41100-E/P
BrandMicrochip
£0.99
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. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
£1.298
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. 170-8170
Mfr. Part No.X9C103SZ
£2.89
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
RS Stock No. 921-5349
Mfr. Part No.X9C103SZ
£4.61
Each (In a Pack of 2)
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
RS Stock No. 806-5308
Mfr. Part No.AD5270BRMZ-100
£3.30
Each (In a Pack of 2)
Units
Serial-SPI 100kΩ 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. 709-4734
Mfr. Part No.AD5243BRMZ2.5
£1.96
Each
Units
Serial-3 Wire, Serial-I2C 2.5kΩ 256 - Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 538-7762
Mfr. Part No.AD5242BRZ1M
£2.49
Each
Units
Serial-2 Wire, Serial-I2C 1000kΩ 256 - Volatile 2 Surface Mount SOIC 16 Dual, Single 3 V, 5 V ±2.5V 10 x 4 x 1.5mm 1.5mm
RS Stock No. 178-4879
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
£0.77
Each (In a Tube of 30)
Units
Serial-SPI 5kΩ 257 Linear Non-Volatile 2 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 523-6838
Mfr. Part No.AD5220BNZ100
£2.72
Each
Units
Serial-3 Wire 100kΩ 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. 145-9002
Mfr. Part No.MCP41010-I/P
BrandMicrochip
£0.909
Each (In a Tube of 60)
Units
Serial-SPI 10kΩ 256 Linear Volatile 1 Through Hole PDIP 8 Single 2.7 to 5.5 V - 9.78 x 6.6 x 3.68mm 3.68mm
RS Stock No. 709-4721
Mfr. Part No.AD5204BRZ10
£3.34
Each
Units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 4 Surface Mount SOIC W 24 Dual, Single 3 V, 5 V ±2.5V 15.6 x 7.6 x 2.35mm 2.35mm
RS Stock No. 796-8815
Mfr. Part No.AD5144ABRUZ10
£4.95
Each
Units
Serial-I2C 10kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 2.3 to 5.5 V ±2.25 → ±2.75V 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 163-0431
Mfr. Part No.CAT5114LI-50-G
£1.63
Each (In a Tube of 50)
Units
Up/Down 50kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 to 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 770-7761
Mfr. Part No.MCP41010-I/P
BrandMicrochip
£1.198
Each (In a Pack of 6)
Units
Serial-SPI 10kΩ 256 Linear Volatile 1 Through Hole PDIP 8 Single 2.7 to 5.5 V - 9.78 x 6.6 x 3.68mm 3.68mm
RS Stock No. 412-696
Mfr. Part No.AD5220BRZ10
£2.294
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