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. 165-3391
Mfr. Part No.MCP4023T-502E/CH
BrandMicrochip
SGD0.925
Each (On a Reel of 3000)
units
Serial-2 Wire 5kΩ 64 Linear Non-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. 540-2108
Mfr. Part No.DS1801+
SGD8.54
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. 819-7095
Mfr. Part No.AD5171BRJZ5-R2
SGD5.21
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. 819-5771
Mfr. Part No.MCP4351T-503E/ST
BrandMicrochip
SGD1.54
Each (On a Reel of 2500)
units
SPI 60kΩ 257 Linear Volatile 4 Surface Mount TSSOP 20 Single 1.8 → 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 145-6430
Mfr. Part No.AD5121BCPZ10-RL7
SGD1.854
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. 190-4775
Mfr. Part No.MAX5437EUD+
SGD12.195
Each (In a Tube of 96)
units
3-Wire SPI, Microwire, QSPI 50kΩ 128 Linear - 1 Surface Mount TSSOP 14 Dual, Single 10 → 30 V ±5 to ±15V 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 165-3383
Mfr. Part No.MCP4018T-104E/LT
BrandMicrochip
SGD0.592
Each (On a Reel of 3000)
units
Serial-I2C 100kΩ 128 Linear Volatile 1 Surface Mount SC-70 6 Single 1.8 → 5.5 V - 2 x 1.25 x 1mm 1mm
RS Stock No. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
SGD2.294
Each (In a Pack of 5)
units
Serial-SPI 100kΩ 256 Linear - 1 Through Hole PDIP 8 Single 3.3 V, 5 V - 9.27 x 6.35 x 3.3mm 3.3mm
RS Stock No. 820-9016
Mfr. Part No.AD5174BRMZ-10
SGD5.86
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 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. 160-9912
Mfr. Part No.AD5160BRJZ50-RL7
SGD1.747
Each (On a Reel of 3000)
units
Serial-SPI 50kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.7 x 1.3mm 1.3mm
RS Stock No. 538-4842
Mfr. Part No.AD5254BRUZ10
SGD9.03
Each
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. 191-3324
Mfr. Part No.MAX5395LATA+T
SGD1.328
Each (On a Reel of 2500)
units
I2C 10kΩ 256 Linear Volatile 1 Surface Mount TDFN-EP 8 Single 1.7 → 5.5 V - 2.1 x 2.1 x 0.75mm 0.75mm
RS Stock No. 724-0047
Mfr. Part No.MCP4362-503E/ST
BrandMicrochip
SGD2.83
Each
units
Serial-SPI 50kΩ 257 Linear Non-Volatile 4 Surface Mount TSSOP 14 Single 1.8 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 189-7154
Mfr. Part No.DS1804Z-010+
SGD3.096
Each (In a Tube of 100)
units
Increment/Decrement 10kΩ 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. 168-4103
Mfr. Part No.AD5248BRMZ100
SGD3.00
Each (In a Tube of 50)
units
Serial-3 Wire, Serial-I2C 100kΩ 256 - Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 169-8268
Mfr. Part No.DS3501U+
SGD1.46
Each (In a Tube of 50)
units
Serial-I2C - - - - - Surface Mount μSOP 10 - - - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 183-1686
Mfr. Part No.AD5170BRMZ2.5
SGD3.68
Each (In a Tube of 50)
units
I2C, Serial-2 Wire 2.5kΩ 256 Linear 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. 759-0715
Mfr. Part No.AD5262BRUZ20-RL7
SGD7.87
Each
units
Serial-3 Wire, Serial-SPI 20kΩ 256 Linear Volatile - Surface Mount TSSOP 16 Dual, Single 4.5 → 16.5 V ±4.5 → ±5.5V 5.1 x 4.5 x 1.2mm 1.2mm
RS Stock No. 190-4766
Mfr. Part No.DS1807E+
SGD6.937
Each (In a Tube of 96)
units
- 45kΩ 65 Log - 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 159-9323
Mfr. Part No.AD5144BRUZ10
SGD7.84
Each (In a Tube of 75)
units
Serial-SPI 10kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 6.6 x 4.5 x 1.05mm 1.05mm
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