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. 732-9711
Mfr. Part No.MAX5481EUD+
BrandMaxim
£2.03
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. 165-9720
Mfr. Part No.MAX5481EUD+
BrandMaxim
£3.423
Each (In a Tube of 96)
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. 160-1641
Mfr. Part No.AD5270BRMZ-100
£2.509
Each (In a Tube of 50)
Units
Serial-SPI 100kΩ 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. 170-8170
Mfr. Part No.X9C103SZ
£2.626
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. 146-1245
Mfr. Part No.MAX5402EUA+
BrandMaxim
£1.568
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. 144-5722
Mfr. Part No.MCP41100-E/P
BrandMicrochip
£0.95
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. 732-7961
Mfr. Part No.MAX5402EUA+
BrandMaxim
£1.20
Each
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. 806-5308
Mfr. Part No.AD5270BRMZ-100
£3.40
Each (In a Pack of 2)
Units
Serial-SPI 100kΩ 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. 158-2560
Mfr. Part No.AD5243BRMZ2.5
£1.49
Each (In a Tube of 50)
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. 201-8946
Mfr. Part No.AD8402AN10
£4.67
Each
Units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Through Hole PDIP 14 Single 3 V, 5 V - 19.05 x 6.35 x 3.3mm 3.3mm
RS Stock No. 709-4721
Mfr. Part No.AD5204BRZ10
£3.94
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. 412-696
Mfr. Part No.AD5220BRZ10
£2.362
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
RS Stock No. 821-3021
Mfr. Part No.CAT5114LI-50-G
£1.618
Each (In a Pack of 5)
Units
Up/Down 50kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 159-9319
Mfr. Part No.AD5144ABRUZ10
£3.891
Each (In a Tube of 75)
Units
Serial-I2C 10kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 796-8815
Mfr. Part No.AD5144ABRUZ10
£5.06
Each
Units
Serial-I2C 10kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 161-0145
Mfr. Part No.AD5220BRZ10
£1.701
Each (In a Tube of 98)
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
RS Stock No. 158-2559
Mfr. Part No.AD5204BRZ10
£2.538
Each (In a Tube of 31)
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. 538-7762
Mfr. Part No.AD5242BRZ1M
£3.81
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. 709-5777
Mfr. Part No.AD5252BRUZ1
£3.75
Each
Units
Serial-3 Wire, Serial-I2C 1kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
RS Stock No. 178-4879
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
£0.79
Each (In a Tube of 30)
Units
Serial-SPI 5kΩ 257 Linear Non-Volatile 2 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
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