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. 912-2770
Mfr. Part No.MCP41100-E/SN
BrandMicrochip
$2.10
Each (In a Tube of 100)
units
Serial-SPI 100kΩ 256 Linear - 1 Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 146-2404
Mfr. Part No.X9C503PZ
$6.83
Each (In a Tube of 50)
units
Serial-3 Wire 50kΩ 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. 738-6115
Mfr. Part No.MCP41010-E/SN
BrandMicrochip
$2.45
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 256 Linear - - Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 403-579
Mfr. Part No.MCP42100-E/P
BrandMicrochip
$3.65
Each (In a Pack of 5)
units
Serial-SPI 100kΩ 256 Linear - 2 Through Hole PDIP 14 Single 3.3 V, 5 V - 19.05 x 6.35 x 3.3mm 3.3mm
RS Stock No. 145-8987
Mfr. Part No.MCP41010-E/SN
BrandMicrochip
$2.10
Each (In a Tube of 100)
units
Serial-SPI 10kΩ 256 Linear - - Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 159-7605
Mfr. Part No.AD5245BRJZ100-R2
$2.71
Each (On a Reel of 250)
units
Serial-3 Wire 100kΩ 256 Linear Volatile - Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 738-6102
Mfr. Part No.MCP4021-103E/SN
BrandMicrochip
$1.19
Each (In a Pack of 5)
units
Serial-2 Wire 10kΩ 64 - Non-Volatile - Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 709-5673
Mfr. Part No.AD5162BRMZ10
$3.97
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 230-703
Mfr. Part No.AD8400ARZ10
$4.98
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. 759-0718
Mfr. Part No.AD5245BRJZ100-R2
$4.22
Each
units
Serial-3 Wire 100kΩ 256 Linear Volatile - Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 145-8983
Mfr. Part No.MCP4551-503E/MS
BrandMicrochip
$1.049
Each (In a Tube of 100)
units
Serial-I2C 50kΩ 257 Linear Non-Volatile 1 Surface Mount MSOP 8 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS Stock No. 160-1641
Mfr. Part No.AD5270BRMZ-100
$6.086
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. 145-6430
Mfr. Part No.AD5121BCPZ10-RL7
$1.846
Each (On a Reel of 1500)
units
Serial-3 Wire, Serial-I2C 10kΩ 128 Linear Non-Volatile 1 Surface Mount LFCSP 16 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 3.1 x 3.1 x 0.75mm 0.75mm
RS Stock No. 819-7095
Mfr. Part No.AD5171BRJZ5-R2
$5.29
Each (In a Pack of 5)
units
I2C, Serial-2 Wire 5kΩ 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. 709-4715
Mfr. Part No.AD5204BRUZ10
$6.44
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. 497-2123
Mfr. Part No.AD5207BRUZ50
$4.548
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-I2C 50kΩ 256 Linear Volatile 2 Surface Mount TSSOP 14 Dual, Single 5 V ±2.5V 5 x 4.4 x 1mm 1mm
RS Stock No. 538-7144
Mfr. Part No.AD5262BRUZ200
$7.98
Each
units
Serial-2 Wire, Serial-I2C 200kΩ 256 Linear Volatile 2 Surface Mount TSSOP 16 Dual, Single 15 V ±5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 158-5277
Mfr. Part No.AD5161BRMZ5
$2.31
Each (In a Tube of 50)
units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 5kΩ 256 - Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 158-0469
Mfr. Part No.AD5160BRJZ10-R2
$2.71
Each (On a Reel of 250)
units
Serial-3 Wire, Serial-SPI 10kΩ 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. 687-8446
Mfr. Part No.MCP4551-103E/MS
BrandMicrochip
$1.42
Each
units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Volatile 1 Surface Mount MSOP 8 Single 2.5 V, 3.3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
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