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. 789-3929
Mfr. Part No.CAT811TTBI-GT3
HK$3.371
Each (In a Pack of 20)
units
Microprocessor Power Supply Supervisor 1 - Yes 3.15V - 3V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 163-2441
Mfr. Part No.MAX809SN232T1G
HK$1.185
Each (On a Reel of 3000)
units
Microprocessor Voltage Monitor 1 - - 2.45V - 2.21V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.9V
RS Stock No. 773-7706
Mfr. Part No.MAX809SN232T1G
HK$3.024
Each (In a Pack of 10)
units
Microprocessor Voltage Monitor 1 - - 2.45V - 2.21V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.9V
RS Stock No. 121-6412
Mfr. Part No.CAT811STBI-GT3
HK$1.441
Each (On a Reel of 3000)
units
Microprocessor Power Supply Supervisor 1 - Yes 3V - 2.85V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 808-0158
Mfr. Part No.NCP303LSN30T1G
HK$3.297
Each (On a Tape of 100)
units
Voltage Monitor 1 - - 4.4V - 2.59V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 806-0760
Mfr. Part No.NCP302HSN27T1G
HK$4.515
Each (On a Tape of 25)
units
Voltage Detector 1 - - 2.781V - 2.619V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 163-0671
Mfr. Part No.NCP302HSN27T1G
HK$1.869
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 2.781V - 2.619V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 163-0682
Mfr. Part No.NCP303LSN30T1G
HK$1.883
Each (On a Reel of 3000)
units
Voltage Monitor 1 - - 4.4V - 2.59V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 124-9970
Mfr. Part No.CAT811TTBI-GT3
HK$1.397
Each (On a Reel of 3000)
units
Microprocessor Power Supply Supervisor 1 - Yes 3.15V - 3V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 789-3925
Mfr. Part No.CAT811STBI-GT3
HK$3.152
Each (In a Pack of 20)
units
Microprocessor Power Supply Supervisor 1 - Yes 3V - 2.85V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 781-4402
Mfr. Part No.NCP803SN293D3T1G
HK$3.969
Each (On a Tape of 20)
units
Microprocessor Reset Monitor 1 No - 3.08V - 2.78V - - Surface Mount SOT-23 3 2.2 x 1.35 x 0.9mm 4.9V
RS Stock No. 162-9516
Mfr. Part No.NCP303LSN45T1G
HK$1.185
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 163-0679
Mfr. Part No.NCP303LSN24T1G
HK$1.483
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 2.448V - 2.352V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 805-2028
Mfr. Part No.NCP300LSN44T1G
HK$3.296
Each (On a Tape of 25)
units
Ultra Low Supply Current 1 - - 4.488V - 4.312V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 781-4405
Mfr. Part No.NCP803SN308T1G
HK$4.946
Each (In a Pack of 20)
units
Microprocessor Reset Monitor - - - 3.23V - 2.92V - - Surface Mount SOT-23 3 2.2 x 1.35 x 0.9mm 4.9V
RS Stock No. 162-9039
Mfr. Part No.NCP303LSN29T1G
HK$1.185
Each (On a Reel of 3000)
units
Undervoltage Detector 1 - - 2.958V - 2.842V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 463-381
Mfr. Part No.MC33064D-5G
HK$5.181
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. 163-2471
Mfr. Part No.MC34064P-5G
HK$2.173
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. 163-0459
Mfr. Part No.MAX810TTRG
HK$2.016
Each (On a Reel of 3000)
units
- 1 - - - - - Active High, Push-Pull 460ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 3.16V
RS Stock No. 806-2491
Mfr. Part No.MAX809SQ293T1G
HK$4.058
Each (On a Tape of 20)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SC-70 3 2.2 x 1.35 x 0.9mm 3V