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. 165-1962
Mfr. Part No.MCP4251-103E/ML
BrandMicrochip
HK$6.67
Each (In a Tube of 91)
units
SPI 10kΩ 257 - Volatile 2 Surface Mount QFN 16 Single 1.8 → 5.5 V - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 192-1637
Mfr. Part No.DS1803Z-100+
HK$41.335
Each (In a Pack of 2)
units
Serial-2 Wire 100kΩ 256 Linear Volatile 2 Surface Mount SOIC 16 Single 2.7 → 5.5 V - 10 x 4 x 1.5mm 1.5mm
RS Stock No. 759-0718
Mfr. Part No.AD5245BRJZ100-R2
HK$24.95
Each
units
Serial-3 Wire 100kΩ 256 Linear Volatile - Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 669-6376
Mfr. Part No.MCP42050-I/P
BrandMicrochip
HK$18.775
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 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. 759-0692
Mfr. Part No.AD5200BRMZ10-REEL7
HK$26.09
Each
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount SOIC 10 Dual, Single 2.7 → 5.5 V ±2.7V 3.15 x 3.15 x 0.97mm 0.97mm
RS Stock No. 817-3553
Mfr. Part No.MCP4361T-104E/ML
BrandMicrochip
HK$12.515
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. 819-5709
Mfr. Part No.MCP4341T-104E/ST
BrandMicrochip
HK$9.342
Each (On a Reel of 2500)
units
SPI 120kΩ 129 Linear Non-Volatile 4 Surface Mount TSSOP 20 Single 2.7 → 5.5 V - 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 189-7152
Mfr. Part No.DS1804-050+
HK$27.502
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. 709-4765
Mfr. Part No.AD5282BRUZ50
HK$44.67
Each
units
Serial-3 Wire, Serial-I2C 50kΩ 256 - Volatile 2 Surface Mount TSSOP 16 Dual, Single 15 V ±5V 5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 709-5698
Mfr. Part No.AD5201BRMZ10
HK$16.304
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 33 Linear Volatile 1 Surface Mount MSOP 10 Dual, Single 3 V, 5 V ±2.5V 3 x 3 x 0.85mm 0.85mm
RS Stock No. 178-4879
Mfr. Part No.MCP4261-502E/P
BrandMicrochip
HK$11.769
Each (In a Tube of 30)
units
Serial-SPI 5kΩ 257 Linear Non-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. 761-7872
Mfr. Part No.MAX5422ETA+T
HK$22.60
Each
units
Serial-SPI 50kΩ 256 Linear Non-Volatile 1 Surface Mount TDFN 8 Single 5 V - 3.1 x 3.1 x 0.8mm 0.8mm
RS Stock No. 806-5311
Mfr. Part No.AD5272BRMZ-20
HK$40.635
Each (In a Pack of 2)
units
Serial-3 Wire, Serial-I2C 20kΩ 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. 144-9092
Mfr. Part No.MCP41050-E/P
BrandMicrochip
HK$11.12
Each (In a Tube of 60)
units
Serial-SPI 50kΩ 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. 875-8665
Mfr. Part No.AD5111BCPZ80-500R7
HK$15.026
Each (In a Pack of 5)
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
RS Stock No. 738-6115
Mfr. Part No.MCP41010-E/SN
BrandMicrochip
HK$12.865
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 256 Linear - - Surface Mount SOIC 8 Single 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 412-692
Mfr. Part No.AD8400ARZ1
HK$29.17
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. 799-7740
Mfr. Part No.MAX5495ETE+
HK$58.17
Each
units
Serial-3 Wire, Serial-SPI 50kΩ 1024 Linear Non-Volatile 2 Surface Mount TQFN 16 Dual, Single 2.7 → 5.25 V ±2.5V 3.1 x 3.1 x 0.75mm 0.75mm
RS Stock No. 165-2066
Mfr. Part No.MCP42100-I/ST
BrandMicrochip
HK$20.746
Each (In a Tube of 96)
units
SPI 100kΩ 256 Linear - 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 191-3780
Mfr. Part No.DS3502U+T&R
HK$7.884
Each (In a Pack of 10)
units
I2C 10kΩ 128 Linear Non-Volatile 1 Surface Mount μSOP 10 Single 2.5 → 5.5 V - 3.16 x 3.12 x 0.95mm 0.95mm
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