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. 159-6634
Mfr. Part No.MCP4561-103E/MS
BrandMicrochip
£0.553
Each (In a Tube of 100)
Units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Non-Volatile 1 Surface Mount MSOP 8 Single 2.5 V, 3.3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 687-8449
Mfr. Part No.MCP4561-103E/MS
BrandMicrochip
£0.73
Each
Units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Non-Volatile 1 Surface Mount MSOP 8 Single 2.5 V, 3.3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 145-5727
Mfr. Part No.AD5241BRZ1M
£1.648
Each (In a Tube of 56)
Units
Serial-2 Wire, Serial-I2C 1000kΩ 256 - Volatile 1 Surface Mount SOIC 14 Dual, Single 3 V, 5 V ±2.5V 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 497-2678
Mfr. Part No.AD5241BRZ1M
£2.146
Each (In a Pack of 5)
Units
Serial-2 Wire, Serial-I2C 1000kΩ 256 - Volatile 1 Surface Mount SOIC 14 Dual, Single 3 V, 5 V ±2.5V 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 106-7042
Mfr. Part No.AD5235BRUZ250
£6.042
Each (In a Tube of 96)
Units
Serial-2 Wire, Serial-I2C 250kΩ 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. 497-0751
Mfr. Part No.AD5235BRUZ250
£7.59
Each
Units
Serial-2 Wire, Serial-I2C 250kΩ 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. 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. 170-8222
Mfr. Part No.X9C102PZ
BrandIntersil
£3.854
Each (In a Tube of 50)
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
£5.37
Each
Units
Serial-SPI 20kΩ 1024 Linear Volatile - Surface Mount TSSOP 14 Dual, Single 9 → 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.2mm 1.2mm
RS Stock No. 106-7041
Mfr. Part No.AD5235BRUZ25
£6.042
Each (In a Tube of 96)
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. 497-0745
Mfr. Part No.AD5235BRUZ25
£7.99
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. 538-7778
Mfr. Part No.AD5242BRUZ1M
£2.52
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. 158-0258
Mfr. Part No.AD5242BRUZ1M
£2.01
Each (In a Tube of 96)
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. 806-5298
Mfr. Part No.AD5175BRMZ-10
£3.125
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 → 5.5 V ±2.5 → ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 160-1639
Mfr. Part No.AD5175BRMZ-10
£2.272
Each (In a Tube of 50)
Units
Serial-3 Wire, Serial-I2C 10kΩ 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. 913-0762
Mfr. Part No.AD5206BRUZ10
£3.493
Each (In a Tube of 62)
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
£2.654
Each (On a Tape of 5)
Units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 709-5718
Mfr. Part No.AD5206BRUZ10
£4.19
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. 145-7199
Mfr. Part No.AD5171BRJZ10-R2
£1.741
Each (On a Reel of 250)
Units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 759-0727
Mfr. Part No.AD5293BRUZ-100
£4.77
Each
Units
Serial-SPI 100kΩ 1024 Linear Volatile - Surface Mount TSSOP 14 Dual, Single 9 → 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.2mm 1.2mm
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