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. 912-7246
Mfr. Part No.AD8400ARZ1
$3.254
Each (In a Tube of 98)
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. 412-692
Mfr. Part No.AD8400ARZ1
$5.54
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. 709-5783
Mfr. Part No.AD5254BRUZ1
$8.93
Each
units
Serial-3 Wire, Serial-I2C 1kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 3 V, 5 V ±2.5V 6.5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 913-0784
Mfr. Part No.AD5254BRUZ1
$6.806
Each (In a Tube of 75)
units
Serial-3 Wire, Serial-I2C 1kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 3 V, 5 V ±2.5V 6.5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 111-1163
Mfr. Part No.AD5220BNZ10
$3.433
Each (In a Tube of 50)
units
Serial-3 Wire 10kΩ 128 - Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.27 x 7.24 x 3.43mm 3.43mm
RS Stock No. 809-9301
Mfr. Part No.AD5171BRJZ10-R2
$4.098
Each (On a Tape of 5)
units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 145-7199
Mfr. Part No.AD5171BRJZ10-R2
$3.611
Each (On a Reel of 250)
units
Serial-2 Wire 10kΩ 64 Linear Non-Volatile 1 Surface Mount SOT-23 8 Single 2.7 → 5.5 V - 2.9 x 1.6 x 1.3mm 1.3mm
RS Stock No. 523-6816
Mfr. Part No.AD5220BNZ10
$4.84
Each
units
Serial-3 Wire 10kΩ 128 - Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.27 x 7.24 x 3.43mm 3.43mm
RS Stock No. 523-6838
Mfr. Part No.AD5220BNZ100
$3.60
Each
units
Serial-3 Wire 100kΩ 128 - Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.27 x 7.24 x 3.43mm 3.43mm
RS Stock No. 912-7435
Mfr. Part No.AD5220BNZ100
$3.433
Each (In a Tube of 50)
units
Serial-3 Wire 100kΩ 128 - Volatile 1 Through Hole PDIP 8 Single 3 V, 5 V - 9.27 x 7.24 x 3.43mm 3.43mm
RS Stock No. 145-5727
Mfr. Part No.AD5241BRZ1M
$2.53
Each (In a Tube of 56)
units
Serial-2 Wire, Serial-I2C 1000kΩ 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. 497-2678
Mfr. Part No.AD5241BRZ1M
$3.046
Each (In a Pack of 5)
units
Serial-2 Wire, Serial-I2C 1000kΩ 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. 709-4765
Mfr. Part No.AD5282BRUZ50
$7.65
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. 158-2564
Mfr. Part No.AD5282BRUZ50
$5.456
Each (In a Tube of 96)
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. 709-5777
Mfr. Part No.AD5252BRUZ1
$7.96
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. 913-0775
Mfr. Part No.AD5252BRUZ1
$4.166
Each (In a Tube of 96)
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. 796-8827
Mfr. Part No.AD5144BRUZ10
$8.35
Each
units
Serial-SPI 10kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 2.3 → 5.5 V ±2.25 → ±2.75V 6.6 x 4.5 x 1.05mm 1.05mm
RS Stock No. 629-3264
Mfr. Part No.AD5254BRUZ50
$8.35
Each
units
Serial-2 Wire, Serial-I2C 50kΩ 256 Linear Non-Volatile 4 Surface Mount TSSOP 20 Dual, Single 3 V, 5 V ±2.5V 6.5 x 4.4 x 1.05mm 1.05mm
RS Stock No. 709-5733
Mfr. Part No.AD5220BRZ100
$3.168
Each (In a Pack of 5)
units
Serial-3 Wire 100kΩ 128 - Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 168-4103
Mfr. Part No.AD5248BRMZ100
$3.48
Each (In a Tube of 50)
units
Serial-3 Wire, Serial-I2C 100kΩ 256 - Volatile 2 Surface Mount MSOP 10 Single 3 V, 5 V - 3 x 3 x 0.85mm 0.85mm