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. 189-7160
Mfr. Part No.MAX5402EUA+
£1.55
Each (In a Tube of 50)
Units
Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount μMAX 8 Single 5.5 V - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 179-5066
Mfr. Part No.AUIR3315STRL
BrandInfineon
£1.57
Each (On a Reel of 800)
Units
Serial-2 Wire - 256 - - - Surface Mount D2-Pak 5 Single 32 (Maximum) V - 10.67 x 9.65 x 4.57mm 4.57mm
RS Stock No. 817-3550
Mfr. Part No.MCP4361T-103E/ST
BrandMicrochip
£1.10
Each (On a Reel of 2500)
Units
Serial-SPI 10kΩ 257 - Non-Volatile 4 Surface Mount TSSOP 20 Single 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 190-4763
Mfr. Part No.DS18030-050+
£3.058
Each (In a Tube of 25)
Units
Serial-2 Wire 50kΩ 256 Linear Volatile 2 Through Hole DIP 16 Single 2.7 → 5.5 V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 165-9599
Mfr. Part No.MAX5495ETE+
£4.302
Each (In a Tube of 60)
Units
Serial-3 Wire, Serial-SPI 50kΩ 1024 Linear Non-Volatile 2 Surface Mount TQFN 16 Dual, Single 2.7 → 5.25 V ±2.5V 3.1 x 3.1 x 0.75mm 0.75mm
RS Stock No. 190-4762
Mfr. Part No.DS1801S+
£3.773
Each (In a Tube of 46)
Units
- 45kΩ 65 Log - 2 Surface Mount SOIC 16 Single 2.7 → 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 190-4761
Mfr. Part No.DS1267BS-100+
£3.528
Each (In a Tube of 46)
Units
- 100kΩ 256 Linear - 2 Surface Mount SO 16 Single 4.5 → 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 165-3381
Mfr. Part No.MCP4017T-503E/LT
BrandMicrochip
£0.302
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. 190-4760
Mfr. Part No.DS1267BS-010+
£3.577
Each (In a Tube of 46)
Units
- 10kΩ 256 Linear - 2 Surface Mount SO 16 Single 4.5 → 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 191-3324
Mfr. Part No.MAX5395LATA+T
£0.614
Each (On a Reel of 2500)
Units
I2C 10kΩ 256 Linear Volatile 1 Surface Mount TDFN-EP 8 Single 1.7 → 5.5 V - 2.1 x 2.1 x 0.75mm 0.75mm
RS Stock No. 168-4107
Mfr. Part No.AD8402ARZ50
£3.37
Each (In a Tube of 56)
Units
Serial-3 Wire, Serial-SPI 50kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 3 V, 5 V - 8.75 x 4 x 1.5mm 1.5mm
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