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. 165-3384
Mfr. Part No.MCP4019T-104E/LT
BrandMicrochip
$0.596
Each (On a Reel of 3000)
units
Serial-I2C 100kΩ 128 Linear Volatile 1 Surface Mount SC-70 5 Single 1.8 → 5.5 V - 2.25 x 1.35 x 1mm 1mm
RS Stock No. 159-7878
Mfr. Part No.AD8402ARZ1
$5.58
Each (In a Tube of 56)
units
Serial-3 Wire, Serial-SPI 1kΩ 256 Linear Volatile 2 Surface Mount SOIC 14 Single 3 V, 5 V - 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 165-2112
Mfr. Part No.MCP41HV51-103E/ST
BrandMicrochip
$1.93
Each (In a Tube of 96)
units
Serial-SPI 10kΩ 256 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 36 V ±18V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 160-1648
Mfr. Part No.AD5292BRUZ-100
$7.86
Each (In a Tube of 96)
units
Serial-SPI 100kΩ 1024 - Non-Volatile 1 Surface Mount TSSOP 14 Dual, Single 9 → 33 V ±9 → ±16.5V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 160-1638
Mfr. Part No.AD5110BCPZ10-500R7
$2.004
Each (On a Reel of 500)
units
Serial-3 Wire, Serial-I2C 80kΩ 128 - Non-Volatile 1 Surface Mount LFCSP UD 8 Single 2.3 → 5.5 V - 2 x 2 x 0.6mm 0.6mm
RS Stock No. 190-4778
Mfr. Part No.MAX5477ETE+
$3.993
Each (In a Tube of 100)
units
I2C 10kΩ 256 Linear Non-Volatile 2 Surface Mount TQFN-EP 16 Single 2.7 → 5.25 V - 3 x 3 x 0.75mm 0.75mm
RS Stock No. 145-8986
Mfr. Part No.MCP4011-502E/SN
BrandMicrochip
$0.616
Each (In a Tube of 100)
units
Serial-2 Wire 5kΩ 64 - Volatile - Surface Mount SOIC 8 Single 2.5 V, 3.3 V, 5 V - 4.9 x 3.9 x 1.25mm 1.25mm
RS Stock No. 709-7111
Mfr. Part No.AD8400ARZ50
$4.82
Each
units
Serial-3 Wire, Serial-SPI 50kΩ 256 Linear Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 191-3289
Mfr. Part No.DS1845E-010+T&R
$4.54
Each (On a Reel of 1000)
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
RS Stock No. 159-7531
Mfr. Part No.MCP4442-502E/ST
BrandMicrochip
$1.73
Each (In a Tube of 96)
units
Serial-I2C (2 Wire) 5kΩ 129 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. 806-5320
Mfr. Part No.AD5272BRMZ-50
$6.71
Each (In a Pack of 2)
units
Serial-3 Wire, Serial-I2C 50kΩ 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. 709-7143
Mfr. Part No.AD8403ARZ50
$12.16
Each
units
Serial-3 Wire, Serial-SPI 50kΩ 256 Linear Volatile 4 Surface Mount SOIC W 24 Single 3 V, 5 V - 15.6 x 7.6 x 2.35mm 2.35mm
RS Stock No. 824-6431
Mfr. Part No.MCP4661T-103E/ML
BrandMicrochip
$1.93
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. 912-6568
Mfr. Part No.AD5280BRUZ20
$5.58
Each (In a Tube of 96)
units
Serial-3 Wire, Serial-I2C 20kΩ 256 - Volatile 1 Surface Mount TSSOP 14 Dual, Single 15 V ±5V 5 x 4.4 x 1mm 1mm
New
RS Stock No. 193-1540
Mfr. Part No.ISL90727WIE627Z-T7A
$1.841
Each (On a Reel of 250)
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. 806-5301
Mfr. Part No.AD5270BRMZ-50
$6.71
Each (In a Pack of 2)
units
Serial-SPI 50kΩ 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. 823-4273
Mfr. Part No.MCP4451-103E/ST
BrandMicrochip
$2.06
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. 191-4241
Mfr. Part No.DS1803E-050+
$6.388
Each (In a Tube of 96)
units
Serial-2 Wire 50kΩ 256 Linear Volatile 2 Surface Mount TSSOP 14 Single 2.7 → 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 158-5281
Mfr. Part No.AD5206BRZ10
$6.60
Each (In a Tube of 31)
units
Serial-3 Wire, Serial-SPI 10kΩ 256 - Volatile 6 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. 183-1685
Mfr. Part No.AD5160BRJZ10-RL7
$1.733
Each (On a Reel of 3000)
units
SPI 10kΩ 256 Linear - 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 3 x 1.7 x 1.3mm 1.3mm
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