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. 538-4858
Mfr. Part No.AD5254BRUZ100
PHP308.70
Each
units
Serial-2 Wire, Serial-I2C 100kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 3 V, 5 V ±2.5V 6.5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 158-0157
Mfr. Part No.AD5254BRUZ100
PHP233.524
Each (In a Tube of 75)
units
Serial-2 Wire, Serial-I2C 100kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 3 V, 5 V ±2.5V 6.5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 523-7386
Mfr. Part No.AD8403ARZ10
PHP363.73
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 4 Surface Mount SOIC W 24 Single 3 V, 5 V - 15.6 x 7.6 x 2.35mm 2.35mm
RS Stock No. 912-7463
Mfr. Part No.AD8403ARZ10
PHP312.993
Each (In a Tube of 31)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 4 Surface Mount SOIC W 24 Single 3 V, 5 V - 15.6 x 7.6 x 2.35mm 2.35mm
RS Stock No. 697-6843
Mfr. Part No.AD5160BRJZ100-R2
PHP128.114
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 100kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 3 V, 5 V - 2.9 x 1.6 x 1.15mm 1.15mm
RS Stock No. 158-5280
Mfr. Part No.AD5201BRMZ10
PHP55.499
Each (In a Tube of 50)
units
Serial-3 Wire, Serial-SPI 10kΩ 33 Linear Volatile 1 Surface Mount MSOP 10 Dual, Single 3 V, 5 V ±2.5V 3 x 3 x 0.85mm 0.85mm
RS Stock No. 160-4479
Mfr. Part No.AD5171BRJZ100-R2
PHP120.23
Each (On a Reel of 250)
units
I2C, Serial-2 Wire 100kΩ 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. 160-9980
Mfr. Part No.AD8400ARZ10
PHP109.934
Each (In a Tube of 98)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 158-0466
Mfr. Part No.AD5227BUJZ10-R2
PHP70.191
Each (On a Reel of 250)
units
Serial-3 Wire 10kΩ 64 - Volatile 1 Surface Mount TSOT 8 Single 3 V, 5 V - 2.9 x 1.6 x 0.87mm 0.87mm
RS Stock No. 629-3286
Mfr. Part No.AD5227BUJZ10-R2
PHP79.304
Each (In a Pack of 5)
units
Serial-3 Wire 10kΩ 64 - Volatile 1 Surface Mount TSOT 8 Single 3 V, 5 V - 2.9 x 1.6 x 0.87mm 0.87mm
RS Stock No. 819-7086
Mfr. Part No.AD5171BRJZ100-R2
PHP163.99
Each (In a Pack of 5)
units
I2C, Serial-2 Wire 100kΩ 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. 111-2252
Mfr. Part No.AD5160BRJZ100-R2
PHP78.205
Each (On a Reel of 250)
units
Serial-3 Wire, Serial-SPI 100kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 3 V, 5 V - 2.9 x 1.6 x 1.15mm 1.15mm
RS Stock No. 230-703
Mfr. Part No.AD8400ARZ10
PHP125.054
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 709-5698
Mfr. Part No.AD5201BRMZ10
PHP62.834
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 33 Linear Volatile 1 Surface Mount MSOP 10 Dual, Single 3 V, 5 V ±2.5V 3 x 3 x 0.85mm 0.85mm
RS Stock No. 169-5480
Mfr. Part No.AD5242BRZ1M
PHP139.65
Each (In a Tube of 48)
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. 538-7762
Mfr. Part No.AD5242BRZ1M
PHP162.89
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. 819-7092
Mfr. Part No.AD5247BKSZ10-RL7
PHP47.51
Each (In a Pack of 5)
units
I2C, Serial-2 Wire 10kΩ 128 - Non-Volatile 1 Surface Mount SC-70 6 Single 2.7 → 5.5 V - 2.2 x 1.35 x 1mm 1mm
RS Stock No. 412-804
Mfr. Part No.AD8402ARZ10
PHP228.73
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 3 V, 5 V - 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 160-4481
Mfr. Part No.AD5247BKSZ10-RL7
PHP40.372
Each (On a Reel of 3000)
units
I2C, Serial-2 Wire 10kΩ 128 - Non-Volatile 1 Surface Mount SC-70 6 Single 2.7 → 5.5 V - 2.2 x 1.35 x 1mm 1mm
RS Stock No. 161-0149
Mfr. Part No.AD8402ARZ10
PHP165.721
Each (In a Tube of 56)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 3 V, 5 V - 8.75 x 4 x 1.5mm 1.5mm