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. 171-7375
Mfr. Part No.BD37A19FVM-TR
BrandROHM
HK$23.814
Each (In a Pack of 5)
units
Supervisory Circuits with Watchdog 1 Yes - - - - - - Surface Mount MSOP 8 2.9 x 2.8 x 0.75mm 1.94V
RS Stock No. 731-4924
Mfr. Part No.BD5247G-TR
BrandROHM
HK$3.213
Each (In a Pack of 10)
units
Open Drain Voltage Detector 1 - - 4.747V - 4.653V - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm -
RS Stock No. 190-5879
Mfr. Part No.MAX6818EAP+T
HK$46.545
Each (In a Pack of 2)
units
- 1 - - - - - Active Low - Surface Mount SSOP 20 7.33 x 5.38 x 1.78mm -
RS Stock No. 179-1799
Mfr. Part No.TL7709ACD
HK$14.836
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. 184-8315
Mfr. Part No.BD4850FVE-TR
BrandROHM
HK$3.591
Each (In a Pack of 50)
units
Open Drain Voltage Detector 1 - - - - - - - Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm 5V
RS Stock No. 624-8371
Mfr. Part No.STM811SW16F
HK$4.389
Each (In a Pack of 10)
units
- 1 - Yes - - - Active Low, Push-Pull 280ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.02mm 3V
RS Stock No. 163-0687
Mfr. Part No.NCP303LSN47T1G
HK$1.869
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 4.841V - 4.559V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 191-3777
Mfr. Part No.MAX6320PUK29CY+T
HK$31.90
Each (In a Pack of 5)
units
Microprocessor Voltage Monitor 1 Yes Yes - - - - - Surface Mount SOT-23 5 3 x 1.75 x 1.3mm -
RS Stock No. 767-3419
Mfr. Part No.MCP102T-270E/TT
BrandMicrochip
HK$5.03
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 2.69V
RS Stock No. 806-0722
Mfr. Part No.NCP305LSQ31T1G
HK$4.515
Each (In a Pack of 25)
units
Voltage Detector 1 - - 3.162V - 3.038V - - Surface Mount SC-82AB 4 2.2 x 1.35 x 1mm 4.9V
RS Stock No. 538-4038
Mfr. Part No.ADM707ANZ
HK$23.99
Each
units
- 1 - Yes - Yes - Active High, Active Low, Push-Pull 280ms Through Hole PDIP 8 9.27 x 7.24 x 3.43mm 4.75V
RS Stock No. 823-0173
Mfr. Part No.LTC1696ES6#TRMPBF
HK$40.255
Each (In a Pack of 2)
units
Overvoltage Protection 1 - - 0.95V - 0.78V - - Surface Mount TSOT-23 6 3.1 x 1.75 x 0.9mm 24V
RS Stock No. 146-1162
Mfr. Part No.MAX8211CPA+
HK$33.516
Each (In a Tube of 50)
units
- 1 - - - Yes - Active Low, Open Drain - Through Hole PDIP 8 9.91 x 7.87 x 4.45mm -
RS Stock No. 168-6390
Mfr. Part No.STM1061N22WX6F
HK$1.682
Each (On a Reel of 3000)
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. 190-1775
Mfr. Part No.MAX8211CPA+
HK$39.355
Each (In a Pack of 2)
units
- 1 - - - Yes - Active Low, Open Drain - Through Hole PDIP 8 9.91 x 7.87 x 4.45mm -
RS Stock No. 667-4250
Mfr. Part No.MCP810T-450I/TT
BrandMicrochip
HK$4.221
Each (In a Pack of 10)
units
- 1 - - - - - Active High, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 4.5V
RS Stock No. 145-2807
Mfr. Part No.MC33064D-5G
HK$6.30
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. 190-1816
Mfr. Part No.MAX8211EPA+
HK$37.915
Each (In a Pack of 2)
units
Microprocessor Voltage Monitor 1 - - 2.5V - 1.8V - - Through Hole PDIP 8 9.91 x 7.87 x 4.45mm -
RS Stock No. 662-4848
Mfr. Part No.TL7705BIP
HK$7.203
Each (In a Pack of 10)
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 18V
RS Stock No. 700-3071
Mfr. Part No.BD4742G-TR
BrandROHM
HK$4.631
Each (In a Pack of 10)
units
Bipolar Voltage Detector 1 - - 4.242V - 4.158V - - Surface Mount SMP 5 2.9 x 1.6 x 1.1mm 4.6V