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. 165-3378
Mfr. Part No.MCP4014T-103E/OT
BrandMicrochip
$0.596
Each (On a Reel of 3000)
units
Serial-2 Wire 10kΩ 64 Linear Volatile 1 Surface Mount SOT-23 5 Single 1.8 → 5.5 V - 3.1 x 1.75 x 1.3mm 1.3mm
RS Stock No. 163-0431
Mfr. Part No.CAT5114LI-50-G
$3.27
Each (In a Tube of 50)
units
Up/Down 50kΩ 32 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 889-5411
Mfr. Part No.MCP42010-E/SL
BrandMicrochip
$2.95
Each (In a Tube of 57)
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. 796-8818
Mfr. Part No.AD5142BRUZ10
$6.57
Each (In a Pack of 2)
units
Serial-SPI 10kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 16 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 5.1 x 4.5 x 1.05mm 1.05mm
RS Stock No. 191-5130
Mfr. Part No.DS3903E-020+
$2.739
Each (In a Pack of 10)
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. 709-5698
Mfr. Part No.AD5201BRMZ10
$2.69
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. 921-5848
Mfr. Part No.X9C102PZ
$10.06
Each (In a Pack of 2)
units
Serial-3 Wire 1kΩ 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. 158-0466
Mfr. Part No.AD5227BUJZ10-R2
$2.25
Each (On a Reel of 250)
units
Serial-3 Wire 10kΩ 64 - Volatile 1 Surface Mount TSOT 8 Single 3 V, 5 V - 2.9 x 1.6 x 0.87mm 0.87mm
RS Stock No. 190-5375
Mfr. Part No.MAX5482EUD+
$5.92
Each (In a Pack of 5)
units
- 50kΩ 1024 Linear Non-Volatile 1 Surface Mount TSSOP 14 Dual, Single 2.7 → 5.25 V -2.5 → -0.2V 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 160-4561
Mfr. Part No.AD5246BKSZ5-RL7
$1.212
Each (On a Reel of 3000)
units
Serial-3 Wire, Serial-I2C 5kΩ 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. 190-5185
Mfr. Part No.DS1801S+
$9.15
Each (In a Pack of 2)
units
- 45kΩ 65 Log - 2 Surface Mount SOIC 16 Single 2.7 → 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 709-5755
Mfr. Part No.AD5242BRZ100
$5.40
Each
units
Serial-2 Wire, Serial-I2C 100kΩ 256 - Volatile 2 Surface Mount SOIC 16 Dual, Single 3 V, 5 V ±2.5V 10 x 4 x 1.5mm 1.5mm
RS Stock No. 738-6809
Mfr. Part No.MCP4018T-104E/LT
BrandMicrochip
$0.78
Each (On a Tape of 5)
units
Serial-I2C 100kΩ 128 Linear Volatile 1 Surface Mount SC-70 6 Single 1.8 → 5.5 V - 2 x 1.25 x 1mm 1mm
RS Stock No. 403-733
Mfr. Part No.MCP42010-E/SL
BrandMicrochip
$3.53
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. 412-696
Mfr. Part No.AD5220BRZ10
$4.66
Each (In a Pack of 5)
units
Serial-3 Wire 10kΩ 128 - Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 145-3237
Mfr. Part No.CAT5113LI-50-G
$4.71
Each (In a Tube of 50)
units
Up/Down 50kΩ 100 Linear Non-Volatile 1 Through Hole PDIP 8 Single 2.5 → 6 V - 10.16 x 7.11 x 4.95mm 4.95mm
RS Stock No. 161-0608
Mfr. Part No.AD5241BRZ10
$3.30
Each (In a Tube of 56)
units
Serial-2 Wire, Serial-I2C 10kΩ 256 - Volatile 1 Surface Mount SOIC 14 Dual, Single 3 V, 5 V ±2.5V 8.75 x 4 x 1.5mm 1.5mm
RS Stock No. 190-4770
Mfr. Part No.DS3904U-020+
$2.21
Each (In a Tube of 50)
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. 189-8290
Mfr. Part No.MAX5402EUA+
$3.748
Each (In a Pack of 5)
units
Serial-SPI 10kΩ 256 Linear Volatile 1 Surface Mount μMAX 8 Single 5.5 V - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 538-4757
Mfr. Part No.AD5252BRUZ100
$6.56
Each
units
Serial-2 Wire, Serial-I2C 100kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Dual, Single 3 V, 5 V ±2.5V 5 x 4.4 x 1mm 1mm
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