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. 540-2108
Mfr. Part No.DS1801+
$8.65
Each
units
Serial-3 Wire 45kΩ 64 Log Volatile 2 Through Hole PDIP 14 Single 3 V, 5 V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 912-7520
Mfr. Part No.AD5254BRUZ10
$7.29
Each (In a Tube of 75)
units
Serial-2 Wire, Serial-I2C 10kΩ 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. 170-8096
Mfr. Part No.X95840WV20IZ-2.7
BrandIntersil
$9.05
Each (In a Tube of 75)
units
Serial-I2C 10kΩ 256 - Non-Volatile 3 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 6.5 x 4.4 x 0.9mm 0.9mm
RS Stock No. 183-2128
Mfr. Part No.AD5271BRMZ-100
$4.28
Each (In a Pack of 5)
units
SPI 100kΩ 256 Linear Non-Volatile 1 Surface Mount MSOP 10 Dual, Single 2.7 → 5.5 V ±2.5 to ±2.75V 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 523-7386
Mfr. Part No.AD8403ARZ10
$10.84
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. 183-1916
Mfr. Part No.AD5160BRJZ10-RL7
$2.81
Each (In a Pack of 5)
units
SPI 10kΩ 256 Linear - 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.7 x 1.3mm 1.3mm
New
RS Stock No. 196-9016
Mfr. Part No.X9C104SIZ
$11.05
Each (In a Pack of 2)
units
- - 32 - - - - - 8 - - - - -
RS Stock No. 189-7152
Mfr. Part No.DS1804-050+
$3.62
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. 106-7042
Mfr. Part No.AD5235BRUZ250
$13.57
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. 159-9314
Mfr. Part No.AD5122ABRUZ100
$5.072
Each (In a Tube of 96)
units
Serial-I2C 100kΩ 128 Linear Non-Volatile 2 Surface Mount TSSOP 16 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 820-9218
Mfr. Part No.AD5170BRMZ100
$5.006
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-I2C 100kΩ 256 Linear Non-Volatile 1 Surface Mount MSOP 10 Single 2.7 → 5.5 V - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 697-6877
Mfr. Part No.AD5259BRMZ10
$4.10
Each (In a Pack of 5)
units
Serial-I2C 10kΩ 256 - Non-Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 158-0474
Mfr. Part No.AD5162BRMZ100
$3.04
Each (In a Tube of 50)
units
Serial-3 Wire, Serial-SPI 100kΩ 256 Linear Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 759-1317
Mfr. Part No.AD8403ARUZ1
$10.84
Each
units
Serial-3 Wire, Serial-SPI 1kΩ 256 Linear Volatile - Surface Mount TSSOP 24 Single 2.7 → 5.5 V - 7.9 x 4.5 x 1.2mm 1.2mm
RS Stock No. 403-575
Mfr. Part No.MCP42050-E/SL
BrandMicrochip
$3.65
Each (In a Pack of 5)
units
Serial-SPI 50kΩ 256 Linear - 2 Surface Mount SOIC 14 Single 3.3 V, 5 V - 8.65 x 3.9 x 1.25mm 1.25mm
RS Stock No. 165-1924
Mfr. Part No.MCP4132-104E/MS
BrandMicrochip
$0.786
Each (In a Tube of 100)
units
Serial-SPI 100kΩ 129 - Volatile 1 Surface Mount MSOP 8 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS Stock No. 168-4154
Mfr. Part No.AD5220BRMZ100
$4.204
Each (In a Tube of 50)
units
Serial-3 Wire 100kΩ 128 Linear Volatile - Surface Mount MSOP 8 Single 2.7 → 5.5 V - 3.2 x 3.2 x 1.1mm 1.1mm
RS Stock No. 709-7111
Mfr. Part No.AD8400ARZ50
$4.82
Each
units
Serial-3 Wire, Serial-SPI 50kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 139-335
Mfr. Part No.DS1804-050+
$4.41
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
RS Stock No. 159-7471
Mfr. Part No.MCP4141-103E/MS
BrandMicrochip
$0.941
Each (In a Tube of 100)
units
SPI 10kΩ 129 - Non-Volatile 1 Surface Mount MSOP 8 Single 2.7 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
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