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. 791-6252
Mfr. Part No.NCP303LSN45T1G
TWD11.40
Each (On a Tape of 25)
units
Voltage Detector 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 162-9516
Mfr. Part No.NCP303LSN45T1G
TWD4.50
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. 789-3929
Mfr. Part No.CAT811TTBI-GT3
TWD11.40
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. 124-9970
Mfr. Part No.CAT811TTBI-GT3
TWD4.50
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. 163-2440
Mfr. Part No.MAX809LTRG
TWD6.20
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.94mm 4.75V
RS Stock No. 802-4013
Mfr. Part No.NCP303LSN27T1G
TWD16.70
Each (On a Tape of 25)
units
Undervoltage Detector 1 - - 2.754V - 2.646V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 806-5244
Mfr. Part No.NCP300LSN20T1G
TWD15.50
Each (In a Pack of 25)
units
Voltage Detector 1 - - 2.06V - 1.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 121-6506
Mfr. Part No.NCP300LSN20T1G
TWD6.20
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 2.06V - 1.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 170-3553
Mfr. Part No.NCP303LSN27T1G
TWD6.20
Each (On a Reel of 3000)
units
Undervoltage Detector 1 - - 2.754V - 2.646V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 688-8796
Mfr. Part No.MAX809LTRG
TWD19.50
Each (In a Pack of 2)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.94mm 4.75V
RS Stock No. 163-0676
Mfr. Part No.NCP302LSN30T1G
TWD4.50
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.06V - 2.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 808-0045
Mfr. Part No.MAX803SQ293T1G
TWD16.20
Each (On a Tape of 50)
units
Microprocessor Reset Monitor 1 - - - - - - - Surface Mount SC-70 3 2.2 x 1.35 x 0.9mm -
RS Stock No. 781-4411
Mfr. Part No.NCP803SN463T1G
TWD14.70
Each (In a Pack of 20)
units
Microprocessor Reset Monitor - - - 4.88V - 4.4V - - Surface Mount SOT-23 3 2.2 x 1.35 x 0.9mm 4.9V
RS Stock No. 163-0678
Mfr. Part No.NCP303LSN18T1G
TWD5.10
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 1.854V - 1.746V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 103-5058
Mfr. Part No.MAX809RTRG
TWD4.50
Each (On a Reel of 3000)
units
- 1 No - - No - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.94mm 2.7V
RS Stock No. 162-9035
Mfr. Part No.NCP303LSN20T1G
TWD4.50
Each (On a Reel of 3000)
units
Undervoltage Detector 1 - - 2.04V - 1.96V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 163-0679
Mfr. Part No.NCP303LSN24T1G
TWD5.60
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. 163-0446
Mfr. Part No.MAX803SQ293D3T1G
TWD5.60
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Open Drain 300ms Surface Mount SC-70 3 2.2 x 1.35 x 0.9mm 3V
RS Stock No. 805-2034
Mfr. Part No.NCP301LSN30T1G
TWD12.40
Each (In a Pack of 25)
units
Ultra Low Supply Current 1 - - 2.94V - 3.06V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 145-2959
Mfr. Part No.MC33164D-3G
TWD19.60
Each (In a Tube of 98)
units
Undervoltage Detector 1 - - 2.8V - 2.55V - - Surface Mount SOIC 8 5 x 4 x 1.5mm 3V