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. 403-676
Mfr. Part No.MCP41010-E/P
BrandMicrochip
HK$13.26
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 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. 144-9093
Mfr. Part No.MCP41010-E/P
BrandMicrochip
HK$11.12
Each (In a Tube of 60)
units
Serial-SPI 10kΩ 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. 146-0134
Mfr. Part No.MCP42010-I/P
BrandMicrochip
HK$15.23
Each (In a Tube of 30)
units
Serial-SPI 10kΩ 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. 669-6367
Mfr. Part No.MCP42010-I/P
BrandMicrochip
HK$18.23
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 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. 889-5878
Mfr. Part No.MCP41010-I/SN
BrandMicrochip
HK$10.357
Each (In a Tube of 100)
units
Serial-SPI 10kΩ 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. 628-3762
Mfr. Part No.MCP41010-I/SN
BrandMicrochip
HK$12.608
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 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. 912-2770
Mfr. Part No.MCP41100-E/SN
BrandMicrochip
HK$11.243
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. 403-654
Mfr. Part No.MCP41100-E/P
BrandMicrochip
HK$13.26
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. 144-5722
Mfr. Part No.MCP41100-E/P
BrandMicrochip
HK$11.247
Each (In a Tube of 60)
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. 403-743
Mfr. Part No.MCP41100-E/SN
BrandMicrochip
HK$13.26
Each (In a Pack of 5)
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. 703-7936
Mfr. Part No.MCP4361-103E/ST
BrandMicrochip
HK$16.09
Each
units
Serial-SPI 10kΩ 257 Linear Non-Volatile 1 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 819-5673
Mfr. Part No.MCP4331T-502E/ML
BrandMicrochip
HK$8.73
Each (On a Reel of 3300)
units
SPI 6kΩ 129 Linear Volatile 4 Surface Mount QFN 20 Single 1.8 → 5.5 V - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 823-4273
Mfr. Part No.MCP4451-103E/ST
BrandMicrochip
HK$11.55
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 256 Linear - 2 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 738-6736
Mfr. Part No.MCP4012T-503E/CH
BrandMicrochip
HK$4.36
Each (On a Tape of 5)
units
Serial-2 Wire 50kΩ 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. 403-733
Mfr. Part No.MCP42010-E/SL
BrandMicrochip
HK$19.77
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 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. 178-4935
Mfr. Part No.MCP42100-I/SL
BrandMicrochip
HK$15.23
Each (In a Tube of 57)
units
Serial-SPI 100kΩ 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. 724-0208
Mfr. Part No.MCP4252-503E/UN
BrandMicrochip
HK$8.53
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 257 Linear Volatile 2 Surface Mount MSOP 10 Single 1.8 → 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS Stock No. 889-5156
Mfr. Part No.MCP4551-103E/MS
BrandMicrochip
HK$5.90
Each (In a Tube of 100)
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
RS Stock No. 817-3553
Mfr. Part No.MCP4361T-104E/ML
BrandMicrochip
HK$12.15
Each (On a Reel of 3300)
units
Serial-SPI 100kΩ 257 - Non-Volatile 4 Surface Mount QFN 20 Single 5.5 V - 4 x 4 x 1mm 1mm
RS Stock No. 145-8958
Mfr. Part No.MCP4661-103E/ST
BrandMicrochip
HK$8.98
Each (In a Tube of 96)
units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Non-Volatile 2 Surface Mount TSSOP 14 Single 2.5 V, 3.3 V, 5 V - 5 x 4.4 x 1mm 1mm