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. 799-7737
Mfr. Part No.MAX5479EUD+
HK$28.41
Each
units
Serial-2 Wire 100kΩ 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. 817-3588
Mfr. Part No.MCP4561T-503E/MS
BrandMicrochip
HK$6.438
Each (On a Reel of 2500)
units
Serial-I2C 50kΩ 257 Linear, Log Non-Volatile 1 Surface Mount MSOP 8 Single 5.5 V - 3 x 3 x 0.95mm 0.95mm
RS Stock No. 697-6868
Mfr. Part No.AD5162BRMZ100
HK$22.25
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 100kΩ 256 Linear Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
RS Stock No. 191-5057
Mfr. Part No.DS18030-100+
HK$41.335
Each (In a Pack of 2)
units
- 10kΩ 256 Linear Volatile 2 Through Hole DIP 16 Single 5.5 (Max.) V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 190-4761
Mfr. Part No.DS1267BS-100+
HK$47.238
Each (In a Tube of 46)
units
- 100kΩ 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. 709-5660
Mfr. Part No.AD5161BRMZ5
HK$17.366
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-3 Wire, Serial-I2C, Serial-SPI 5kΩ 256 - Volatile 1 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm
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. 819-5774
Mfr. Part No.MCP4351T-502E/ST
BrandMicrochip
HK$8.992
Each (On a Reel of 2500)
units
SPI 6kΩ 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. 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. 824-6431
Mfr. Part No.MCP4661T-103E/ML
BrandMicrochip
HK$11.103
Each (In a Pack of 10)
units
Serial-I2C 12kΩ 256 - Non-Volatile 2 Surface Mount QFN 16 Single 2.7 → 5.5 V - 4 x 4 x 0.95mm 0.95mm
RS Stock No. 697-6865
Mfr. Part No.AD5245BRJZ5-R2
HK$24.946
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-I2C 5kΩ 256 - Volatile 1 Surface Mount SOT-23 8 Single 3 V, 5 V - 2.9 x 1.6 x 1.15mm 1.15mm
RS Stock No. 183-2045
Mfr. Part No.AD5243BRMZ100
HK$22.25
Each (In a Pack of 5)
units
I2C, Serial-2 Wire 100kΩ 256 Linear Non-Volatile 2 Surface Mount MSOP 10 Single 2.7 → 5.5 V - 3.1 x 3.1 x 0.95mm 0.95mm
RS Stock No. 190-5279
Mfr. Part No.MAX5400EKA+T
HK$18.334
Each (In a Pack of 5)
units
3-Wire SPI 50kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.75 x 1.3mm 1.3mm
RS Stock No. 189-8313
Mfr. Part No.MAX5403EUB+
HK$37.462
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 Linear Volatile 2 Surface Mount μMAX 10 Single 2.7 → 5.5 V - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 189-7153
Mfr. Part No.DS1804-100+
HK$24.531
Each (In a Tube of 50)
units
Increment/Decrement 100kΩ 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. 921-5535
Mfr. Part No.X9C503PZ
HK$45.01
Each (In a Pack of 2)
units
Serial-3 Wire 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 5 V - 9.56 x 6.35 x 3.3mm 3.3mm
RS Stock No. 709-5777
Mfr. Part No.AD5252BRUZ1
HK$37.84
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
RS Stock No. 709-5695
Mfr. Part No.AD5200BRMZ50
HK$25.786
Each (In a Pack of 5)
units
Serial-3 Wire, Serial-SPI 50kΩ 256 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. 823-4273
Mfr. Part No.MCP4451-103E/ST
BrandMicrochip
HK$11.896
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. 190-5304
Mfr. Part No.DS1845E-010+
HK$31.99
Each (In a Pack of 2)
units
- 10kΩ 100 Linear Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
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