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. 178-4880
Mfr. Part No.MCP4251-503E/P
BrandMicrochip
$1.298
Each (In a Tube of 30)
units
Serial-SPI 50kΩ 257 Linear Volatile 2 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 723-9744
Mfr. Part No.MCP4251-503E/P
BrandMicrochip
$1.56
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 257 Linear Volatile 2 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 912-7246
Mfr. Part No.AD8400ARZ1
$3.615
Each (In a Tube of 98)
units
Serial-3 Wire, Serial-SPI 1kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 412-692
Mfr. Part No.AD8400ARZ1
$5.082
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 1kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 169-8256
Mfr. Part No.DS1804Z-050+
$4.645
Each (In a Tube of 100)
units
Increment/Decrement 50kΩ 100 Linear Non-Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 139-464
Mfr. Part No.DS1804Z-050+
$3.47
Each
units
Increment/Decrement 50kΩ 100 Linear Non-Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 738-6727
Mfr. Part No.MCP4012T-103E/CH
BrandMicrochip
$0.748
Each (In a Pack of 5)
units
Serial-2 Wire 10kΩ 64 Linear Volatile 1 Surface Mount SOT-23 6 Single 1.8 → 5.5 V - 3.1 x 1.75 x 1.3mm 1.3mm
RS Stock No. 723-9930
Mfr. Part No.MCP4151-103E/P
BrandMicrochip
$1.485
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 257 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 to 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 159-7405
Mfr. Part No.MCP4151-103E/P
BrandMicrochip
$1.235
Each (In a Tube of 60)
units
Serial-SPI 10kΩ 257 Linear Volatile 1 Through Hole PDIP 8 Single 1.8 → 5.5 V - 0.4 x 0.28 x 0.195in 4.95mm
RS Stock No. 165-3374
Mfr. Part No.MCP4012T-103E/CH
BrandMicrochip
$0.635
Each (On a Reel of 3000)
units
Serial-2 Wire 10kΩ 64 Linear Volatile 1 Surface Mount SOT-23 6 Single 1.8 → 5.5 V - 3.1 x 1.75 x 1.3mm 1.3mm
RS Stock No. 724-0609
Mfr. Part No.MCP4012T-502E/CH
BrandMicrochip
$0.816
Each (In a Pack of 5)
units
Serial-2 Wire 5kΩ 64 Linear Volatile 1 Surface Mount SOT-23 6 Single 1.8 → 5.5 V - 3.1 x 1.75 x 1.3mm 1.3mm
RS Stock No. 759-0724
Mfr. Part No.AD5292BRUZ-20
$9.36
Each
units
Serial-SPI 20kΩ 1024 Linear Non-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. 732-7456
Mfr. Part No.DS1804-010+
$3.42
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. 165-9184
Mfr. Part No.DS1804-010+
$3.047
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. 170-4313
Mfr. Part No.MCP4012T-502E/CH
BrandMicrochip
$0.661
Each (On a Reel of 3000)
units
- - - - - - - - - - - - - -
RS Stock No. 165-8961
Mfr. Part No.DS1801+
$7.535
Each (In a Tube of 25)
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. 913-0784
Mfr. Part No.AD5254BRUZ1
$8.167
Each (In a Tube of 75)
units
Serial-3 Wire, Serial-I2C 1kΩ 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. 819-7095
Mfr. Part No.AD5171BRJZ5-R2
$4.496
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. 169-8290
Mfr. Part No.X9118TV14IZ
BrandIntersil
$15.235
Each (In a Tube of 95)
units
Serial-2 Wire 100kΩ 1024 Linear Non-Volatile 1 Surface Mount TSSOP 14 Dual - ±5V 5.05 x 4.5 x 1.05mm 1.05mm
RS Stock No. 709-5777
Mfr. Part No.AD5252BRUZ1
$6.47
Each
units
Serial-3 Wire, Serial-I2C 1kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
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