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. 723-9741
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
£0.915
Each (In a Pack of 2)
Units
Serial-SPI 5kΩ 257 Linear Non-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. 163-0431
Mfr. Part No.CAT5114LI-50-G
£1.663
Each (In a Tube of 50)
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. 145-9002
Mfr. Part No.MCP41010-I/P
BrandMicrochip
£0.914
Each (In a Tube of 60)
Units
Serial-SPI 10kΩ 256 Linear Volatile 1 Through Hole PDIP 8 Single 2.7 → 5.5 V - 9.78 x 6.6 x 3.68mm 3.68mm
RS Stock No. 159-9319
Mfr. Part No.AD5144ABRUZ10
£4.203
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. 158-2559
Mfr. Part No.AD5204BRZ10
£2.97
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. 178-4879
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
£0.766
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
RS Stock No. 412-696
Mfr. Part No.AD5220BRZ10
£2.388
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. 161-0145
Mfr. Part No.AD5220BRZ10
£1.991
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. 161-0607
Mfr. Part No.AD5241BRUZ100
£1.648
Each (In a Tube of 96)
Units
Serial-2 Wire, Serial-I2C 100kΩ 256 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
RS Stock No. 111-2230
Mfr. Part No.AD5263BRUZ200
£4.507
Each (In a Tube of 62)
Units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 200kΩ 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. 823-3567
Mfr. Part No.MCP4241-103E/ST
BrandMicrochip
£0.553
Each (In a Pack of 10)
Units
SPI 10kΩ 129 - Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 159-9322
Mfr. Part No.AD5144ABRUZ100
£4.56
Each (In a Tube of 75)
Units
Serial-I2C 100kΩ 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. 497-2634
Mfr. Part No.AD5241BRUZ100
£2.038
Each (In a Pack of 5)
Units
Serial-2 Wire, Serial-I2C 100kΩ 256 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
RS Stock No. 158-2562
Mfr. Part No.AD5282BRUZ200
£2.299
Each (In a Tube of 96)
Units
Serial-3 Wire, Serial-I2C 200kΩ 256 - Volatile 2 Surface Mount TSSOP 16 Dual, Single 15 V ±5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 709-4756
Mfr. Part No.AD5282BRUZ200
£2.34
Each
Units
Serial-3 Wire, Serial-I2C 200kΩ 256 - Volatile 2 Surface Mount TSSOP 16 Dual, Single 15 V ±5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 709-4715
Mfr. Part No.AD5204BRUZ10
£3.21
Each
Units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 4 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. 158-2558
Mfr. Part No.AD5204BRUZ10
£2.467
Each (In a Tube of 62)
Units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 4 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. 738-6972
Mfr. Part No.MCP4131-503E/P
BrandMicrochip
£0.508
Each (In a Pack of 5)
Units
Serial-SPI 50kΩ 129 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 145-8990
Mfr. Part No.MCP4131-503E/P
BrandMicrochip
£0.425
Each (In a Tube of 60)
Units
Serial-SPI 50kΩ 129 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 538-6012
Mfr. Part No.AD5263BRUZ200
£5.42
Each
Units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 200kΩ 256 Linear Volatile 4 Surface Mount TSSOP 24 Dual, Single 5 V ±5V 7.8 x 4.4 x 1.05mm 1.05mm
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