Digital Potentiometers

Digital Potentiometers are three-terminal devices, two fixed end terminals and one wiper terminal which are used to vary resistance.

What is a Digital potentiometer?

A digital potentiometer also known as a digipot, is similar to a standard analogue potentiometer, which is a variable type resistor except the digital potentiometer has an IC (integrated circuit) that can take a signal input rather. 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 vulnerable 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. 191-3780
Mfr. Part No.DS3502U+T&R
SGD1.628
Each (In a Pack of 10)
units
I2C 10kΩ 128 Linear Non-Volatile 1 Surface Mount μSOP 10 Single 2.5 to 5.5 V - 3.16 x 3.12 x 0.95mm 0.95mm
RS Stock No. 419-609
Mfr. Part No.DS3501U+
SGD1.716
Each (In a Pack of 5)
units
Serial-I2C - - - - - Surface Mount μSOP 10 - - - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 732-9711
Mfr. Part No.MAX5481EUD+
SGD6.50
Each
units
Serial-SPI 10kΩ 1024 Linear Non-Volatile 1 Surface Mount TSSOP 14 Dual, Single 5.25 V ±2.5V 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 190-4772
Mfr. Part No.MAX5400EKA+T
SGD2.195
Each (On a Reel of 2500)
units
3-Wire SPI 50kΩ 256 Linear Volatile 1 Surface Mount SOT-23 8 Single 2.7 to 5.5 V - 3 x 1.75 x 1.3mm 1.3mm
RS Stock No. 190-6078
Mfr. Part No.MAX5496ETE+
SGD9.31
Each (In a Tube of 60)
units
Serial-3 Wire/ Serial-SPI 50kΩ 1024 Linear Non-Volatile 2 Surface Mount TQFN 16 Dual, Single 2.7 to 5.25 V ±2.5V 5 x 5 x 0.75mm 0.75mm
RS Stock No. 191-5130
Mfr. Part No.DS3903E-020+
SGD2.736
Each (In a Pack of 10)
units
- 110kΩ 128 Linear Non-Volatile 3 Surface Mount TSSOP 20 Single 5.5 V - 6.6 x 0.177 x 0.037mm 0.04mm
RS Stock No. 799-7737
Mfr. Part No.MAX5479EUD+
SGD6.16
Each
units
Serial-2 Wire 100kΩ 256 Linear Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 to 5.25 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 190-5329
Mfr. Part No.MAX5437EUD+
SGD13.39
Each (In a Pack of 2)
units
Microwire, QSPI, 3-Wire SPI 50kΩ 128 Linear - 1 Surface Mount TSSOP 14 Dual, Single 10 to 30 V ±5 to ±15V 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 192-1248
Mfr. Part No.DS1801+
SGD9.844
Each (In a Tube of 25)
units
Serial-3 Wire 45kΩ 64 Log Volatile 2 Through Hole PDIP 14 Single 3 V, 5 V - 19.43 x 7.87 x 4.45mm 4.45mm
RS Stock No. 191-3540
Mfr. Part No.MAX5395LATA+T
SGD1.816
Each (In a Pack of 10)
units
I2C 10kΩ 256 Linear Volatile 1 Surface Mount TDFN-EP 8 Single 1.7 to 5.5 V - 2.1 x 2.1 x 0.75mm 0.75mm
RS Stock No. 190-5304
Mfr. Part No.DS1845E-010+
SGD5.825
Each (In a Pack of 2)
units
- 10kΩ 100 Linear Non-Volatile 2 Surface Mount TSSOP 14 Single 2.7 to 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 191-4776
Mfr. Part No.DS1803E-050+
SGD7.41
Each (In a Pack of 2)
units
Serial-2 Wire 50kΩ 256 Linear Volatile 2 Surface Mount TSSOP 14 Single 2.7 to 5.5 V - 5.1 x 4.5 x 0.95mm 0.95mm
RS Stock No. 189-7154
Mfr. Part No.DS1804Z-010+
SGD3.096
Each (In a Tube of 100)
units
Increment/Decrement 10kΩ 100 Linear Non-Volatile 1 Surface Mount SOIC 8 Single 3 V, 5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 189-7150
Mfr. Part No.DS1803Z-010+
SGD6.636
Each (In a Tube of 50)
units
Serial-2 Wire 10kΩ 256 Linear Volatile 2 Surface Mount SOIC 16 Single 5 V - 10 x 4 x 1.5mm 1.5mm
RS Stock No. 169-8268
Mfr. Part No.DS3501U+
SGD1.32
Each (In a Tube of 50)
units
Serial-I2C - - - - - Surface Mount μSOP 10 - - - 3.05 x 3.05 x 0.95mm 0.95mm
RS Stock No. 189-7167
Mfr. Part No.MAX5494ETE+
SGD10.175
Each (In a Tube of 60)
units
Serial-SPI 10kΩ 1024 Linear Non-Volatile 1 Surface Mount TQFN 16 Dual 2.7 to 5.25 V ±2.5V 5.1 x 5.1 x 0.75mm 0.75mm
RS Stock No. 192-1637
Mfr. Part No.DS1803Z-100+
SGD7.53
Each (In a Pack of 2)
units
Serial-2 Wire 100kΩ 256 Linear Volatile 2 Surface Mount SOIC 16 Single 2.7 to 5.5 V - 10 x 4 x 1.5mm 1.5mm
RS Stock No. 190-5291
Mfr. Part No.DS1267BS-010+
SGD8.85
Each (In a Pack of 2)
units
- 10kΩ 256 Linear - 2 Surface Mount SO 16 Single 4.5 to 5.5 V - 10.5 x 7.6 x 2.35mm 2.35mm
RS Stock No. 190-5249
Mfr. Part No.DS1804Z-100+
SGD4.40
Each (In a Pack of 5)
units
Up/Down 100kΩ 100 Linear Non-Volatile 1 Surface Mount SO 8 Single 2.7 to 5.5 V - 5 x 4 x 1.5mm 1.5mm
RS Stock No. 190-5349
Mfr. Part No.DS3930E+
SGD6.528
Each (In a Pack of 5)
units
- 19.8kΩ 256 Linear Non-Volatile 6 Surface Mount TSSOP 20 Single 2.7 to 5.5 V - 6.6 x 4.5 x 0.95mm 0.95mm