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. 687-8449
Mfr. Part No.MCP4561-103E/MS
BrandMicrochip
£0.80
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. 159-6634
Mfr. Part No.MCP4561-103E/MS
BrandMicrochip
£0.60
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. 497-0751
Mfr. Part No.AD5235BRUZ250
£8.54
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. 145-5727
Mfr. Part No.AD5241BRZ1M
£1.735
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
£6.36
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. 786-0792
Mfr. Part No.DS1809-010+
BrandMaxim
£2.755
Each (In a Pack of 2)
Units
Contact/Closure 10kΩ 64 Linear Non-Volatile 1 Through Hole PDIP 8 Single 4.5 → 5.5 V - 9.91 x 7.87 x 4.45mm 4.45mm
RS Stock No. 170-8222
Mfr. Part No.X9C102PZ
BrandIntersil
£3.567
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. 921-5848
Mfr. Part No.X9C102PZ
£4.195
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. 165-9395
Mfr. Part No.DS1809-010+
BrandMaxim
£2.362
Each (In a Tube of 50)
Units
Contact/Closure 10kΩ 64 Linear Non-Volatile 1 Through Hole PDIP 8 Single 4.5 → 5.5 V - 9.91 x 7.87 x 4.45mm 4.45mm
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
£6.36
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. 165-9184
Mfr. Part No.DS1804-010+
BrandMaxim
£1.793
Each (In a Tube of 50)
Units
Increment 10kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 5 V - 9.91 x 7.87 x 4.45mm 4.45mm
RS Stock No. 732-7456
Mfr. Part No.DS1804-010+
BrandMaxim
£2.15
Each
Units
Increment 10kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 5 V - 9.91 x 7.87 x 4.45mm 4.45mm
RS Stock No. 177-6853
Mfr. Part No.DS18030-010+
BrandMaxim
£3.42
Each (In a Tube of 25)
Units
Serial-2 Wire 10kΩ 256 Linear Volatile 2 Through Hole PDIP 16 Single 3 V, 5 V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 139-284
Mfr. Part No.DS18030-010+
BrandMaxim
£3.79
Each
Units
Serial-2 Wire 10kΩ 256 Linear Volatile 2 Through Hole PDIP 16 Single 3 V, 5 V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 158-0258
Mfr. Part No.AD5242BRUZ1M
£2.029
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. 146-1116
Mfr. Part No.DS1804-050+
BrandMaxim
£1.833
Each (In a Tube of 50)
Units
Increment/Decrement 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.91 x 7.87 x 4.45mm 4.45mm
RS Stock No. 139-335
Mfr. Part No.DS1804-050+
BrandMaxim
£2.15
Each
Units
Increment/Decrement 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.91 x 7.87 x 4.45mm 4.45mm
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