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. 759-0727
Mfr. Part No.AD5293BRUZ-100
HK$58.26
Each
units
Serial-SPI 100kΩ 1024 Linear 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. 192-2707
Mfr. Part No.MAX5487EUD+
HK$33.072
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.25 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 823-7910
Mfr. Part No.MCP4641T-502E/ML
BrandMicrochip
HK$9.342
Each (In a Pack of 10)
units
Serial-I2C 5kΩ 129 - Non-Volatile 2 Surface Mount QFN 16 Single 2.7 → 5.5 V - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 196-9011
Mfr. Part No.X9C102PIZ
HK$56.359
Each (In a Tube of 50)
units
- - 32 - - - - - 8 - - - - -
RS Stock No. 709-4721
Mfr. Part No.AD5204BRZ10
HK$36.02
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 4 Surface Mount SOIC W 24 Dual, Single 3 V, 5 V ±2.5V 15.6 x 7.6 x 2.35mm 2.35mm
RS Stock No. 819-7092
Mfr. Part No.AD5247BKSZ10-RL7
HK$12.41
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. 145-8959
Mfr. Part No.MCP4651-103E/ST
BrandMicrochip
HK$7.901
Each (In a Tube of 96)
units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Volatile 2 Surface Mount TSSOP 14 Single 2.5 V, 3.3 V, 5 V - 5 x 4.4 x 1mm 1mm
RS Stock No. 159-7471
Mfr. Part No.MCP4141-103E/MS
BrandMicrochip
HK$5.377
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
RS Stock No. 703-7927
Mfr. Part No.MCP4362-103E/ST
BrandMicrochip
HK$16.57
Each
units
Serial-SPI 10kΩ 257 Linear Non-Volatile 1 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 709-5718
Mfr. Part No.AD5206BRUZ10
HK$45.95
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 6 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. 146-0243
Mfr. Part No.MCP4241-103E/ST
BrandMicrochip
HK$8.919
Each (In a Tube of 96)
units
SPI 10kΩ 129 - Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 191-3920
Mfr. Part No.DS3903E-020+
HK$15.102
Each (In a Tube of 74)
units
- 110kΩ 128 Linear Non-Volatile 3 Surface Mount TSSOP 20 Single 5.5 (Max.) V - 6.6 x 0.177 x 0.037mm 0.04mm
RS Stock No. 193-1541
Mfr. Part No.ISL90727WIE627Z-T7A
HK$16.398
Each (In a Pack of 5)
units
Serial-I2C 10kΩ 128 - Volatile 1 Surface Mount SC-70 6 Single 2.7 → 5.5 V - 2.15 x 1.35 x 1mm 1mm
RS Stock No. 190-4760
Mfr. Part No.DS1267BS-010+
HK$48.43
Each (In a Tube of 46)
units
- 10kΩ 256 Linear - 2 Surface Mount SO 16 Single 4.5 → 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 888-4840
Mfr. Part No.MCP4018T-103E/LT
BrandMicrochip
HK$3.956
Each (On a Reel of 3000)
units
Serial-2 Wire, Serial-I2C 10kΩ 128 - Volatile 1 Surface Mount SC-70 6 Single 2.5 V, 3.3 V, 5 V - 2 x 1.25 x 0.9mm 0.9mm
RS Stock No. 921-5844
Mfr. Part No.X9241AUSIZ
HK$95.67
Each
units
Serial-2 Wire 50kΩ 64 Linear Non-Volatile 4 Surface Mount SOIC 20 Single 5 V - 12.8 x 7.49 x 2.34mm 2.34mm
RS Stock No. 796-9145
Mfr. Part No.AD5121BCPZ10-RL7
HK$18.158
Each (In a Pack of 5)
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. 190-5335
Mfr. Part No.DS3904U-020+
HK$12.247
Each (In a Pack of 10)
units
- 20kΩ 128 Linear Non-Volatile 3 Surface Mount μSOP 8 Single 2.7 → 5.5 V - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 183-2128
Mfr. Part No.AD5271BRMZ-100
HK$23.50
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. 160-2735
Mfr. Part No.AD5111BCPZ80-500R7
HK$13.077
Each (On a Reel of 500)
units
Up/Down 80kΩ 128 Linear Non-Volatile 1 Surface Mount LFCSP 8 Single 5.5 V - 2 x 2 x 0.6mm 0.6mm