Voltage Supervisors

Voltage supervisors are integrated circuits (ICs) that monitor or supervise a voltage within an electronic circuit. They are sometimes referred to as voltage monitors or detectors. Voltage supervisors are found in most electronic applications and are used to prevent system failure and ensure correct system power up.


Voltage supervisors have an output signal which is given if the voltage falls outside of the chose parameters. This signal can be used to enable, disable or reset another device. Supervisors are commonly paired with a microprocessor (MPU) or microcontroller (MCU) device, as they often require a specific voltage range. Voltage supervisors can also be used as a fault detector for a sensor.


Types of Voltage Supervisors:


  • CMOS voltage detector

  • Open drain voltage detector

  • Watchdog timer

  • Window detector

  • Back-up battery supervisor

  • Battery monitoring

Things to consider when choosing a voltage supervisor?


  • Reset voltage

  • Supply voltage

  • Number of channels

  • Package type

What are processor supervisors?


Processor Supervisors monitor voltage for microprocessors and microcontrollers (MCUs). It is essential that processor parameters are monitored by supervisors to ensure that these parameter boundaries are not exceeded. Exceeding some parameters can result in failure or even a dangerous result.


One of the primary things that a processor supervisor will monitor is voltage. For example, a supervisory circuit monitor may monitor voltages with a threshold of 1.6V to 5V. If the CPU’s circuit voltage falls outside of these limits, the supervisor would create an output signal, for example, a reset output.


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Description Price Voltage Supervisor Type Number of Supervisors Watchdog Timer Manual Reset Maximum Reset Threshold Voltage Power Fail Detection Minimum Reset Threshold Voltage Output Driver Maximum Reset Active Time Mounting Type Package Type Pin Count Dimensions Maximum Monitored Voltage
RS Stock No. 178-8993
Mfr. Part No.TPS3103K33DBVT
kr 15,611
Each (On a Reel of 3000)
Units
Ultra Low Supply Current 1 Yes Yes 2.963V - 2.919V - - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 3.6V
RS Stock No. 662-4157
Mfr. Part No.TPS3103K33DBVT
kr 26,722
Each (In a Pack of 5)
Units
Ultra Low Supply Current 1 Yes Yes 2.963V - 2.919V - - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 3.6V
RS Stock No. 463-381
Mfr. Part No.MC33064D-5G
Brandonsemi
kr 5,914
Each (In a Pack of 10)
Units
Undervoltage Detector 1 No No 4.7V - 4.5V - - Surface Mount SOIC 8 5 x 4 x 1.5mm -
RS Stock No. 923-5763
Mfr. Part No.DS1232LPS-2+
kr 21,081
Each (In a Tube of 400)
Units
Microprocessor Power Supply Supervisor 1 Yes Yes - Yes - Active High, Active Low, Open Drain 1000ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.74V
RS Stock No. 516-5067
Mfr. Part No.MC34064P-5G
Brandonsemi
kr 7,28
Each
Units
- 1 - - - - - - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 4.7V
RS Stock No. 136-0681
Mfr. Part No.DS1232LPS-2+
kr 28,711
Each (In a Tube of 100)
Units
Microprocessor Power Supply Supervisor - - - - - - - - - - - - -
RS Stock No. 163-2471
Mfr. Part No.MC34064P-5G
Brandonsemi
kr 2,747
Each (In a Bag of 2000)
Units
- 1 - - - - - - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 4.7V
RS Stock No. 732-7270
Mfr. Part No.DS1232LPS-2+
kr 34,68
Each
Units
Microprocessor Power Supply Supervisor 1 Yes Yes - Yes - Active High, Active Low, Open Drain 1000ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.74V
RS Stock No. 145-2807
Mfr. Part No.MC33064D-5G
Brandonsemi
kr 5,917
Each (In a Tube of 98)
Units
Undervoltage Detector 1 No No 4.7V - 4.5V - - Surface Mount SOIC 8 5 x 4 x 1.5mm -
RS Stock No. 767-3447
Mfr. Part No.MCP111T-475E/TT
BrandMicrochip
kr 4,794
Each (In a Pack of 10)
Units
- 1 - - - Yes - Active Low 130ms Surface Mount SOT-23B 3 3.04 x 1.4 x 1.02mm 4.74V
RS Stock No. 686-4793
Mfr. Part No.STM1061N22WX6F
kr 5,27
Each (In a Pack of 25)
Units
Low Power Voltage Detector 1 - - 2.244V - 2.156V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm -
RS Stock No. 179-1799
Mfr. Part No.TL7709ACD
kr 12,746
Each (In a Tube of 75)
Units
Supply 1 - - 7.7V - 7.5V - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 15V
RS Stock No. 171-7401
Mfr. Part No.BD4823FVE-TR
BrandROHM
kr 2,122
Each (In a Pack of 20)
Units
Open Drain Voltage Detector 1 - - - - - - - Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm 2.3V
RS Stock No. 187-9411
Mfr. Part No.MCP1317T-31RE/OT
BrandMicrochip
kr 4,51
Each (On a Reel of 3000)
Units
- 1 Yes Yes - - - Push-Pull 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm -
RS Stock No. 767-3469
Mfr. Part No.MCP112T-300E/TT
BrandMicrochip
kr 1,573
Each (In a Pack of 10)
Units
- 1 - - - Yes - Active Low 130ms Surface Mount SOT-23B 3 3.04 x 1.4 x 1.02mm 3V
RS Stock No. 379-2213
Mfr. Part No.MCP130-475DI/TO
BrandMicrochip
kr 5,154
Each (In a Pack of 5)
Units
- 1 - - - - - Active Low, Open Drain 700ms Through Hole TO-92 3 4.71 x 3.62 x 4.62mm 4.75V
RS Stock No. 163-0908
Mfr. Part No.CAT853TTBI-GT3
Brandonsemi
kr 2,481
Each (On a Reel of 3000)
Units
Microprocessor Power Supply Supervisor - - - 3.15V - 3V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.12mm 5V
RS Stock No. 578-853
Mfr. Part No.STM6719SFWB6F
kr 9,48
Each (In a Pack of 5)
Units
Dual/Triple Ultra Low 3 - Yes 3V - 1.02V - - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 5.5V
RS Stock No. 162-6419
Mfr. Part No.TL7757CLPRE3
kr 3,53
Each (On a Reel of 2000)
Units
Voltage Detector 1 - - 4.67V - 4.43V - - Through Hole TO-92 3 4.83 x 3.43 x 3.68mm -
RS Stock No. 923-1503
Mfr. Part No.ICL7665SIBAZ
kr 31,446
Each (In a Tube of 98)
Units
Micropower Voltage Detector 2 - - 1.4V - 1.2V - - Surface Mount SOIC 8 5 x 4 x 1.5mm -