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. 781-4051
Mfr. Part No.CAT803LTBI-GT3
MYR1.191
Each (In a Pack of 20)
units
Microprocessor Power Supply Supervisor - - - 4.75V - 4.5V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.12mm 5V
RS Stock No. 412-664
Mfr. Part No.ADM691ANZ
MYR19.71
Each
units
Microprocessor Supervisory Circuit 1 Yes - - Yes - Active High, Active Low, Push-Pull 70ms Through Hole PDIP 16 21.33 x 7.11 x 4.95mm 4.75V
RS Stock No. 862-4932
Mfr. Part No.MC34164P-5G
MYR2.457
Each (In a Pack of 25)
units
Undervoltage Detector 1 - - 4.45V - 4.15V - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V
RS Stock No. 163-0020
Mfr. Part No.MC34164P-5G
MYR1.135
Each (In a Bag of 2000)
units
Undervoltage Detector 1 - - 4.45V - 4.15V - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V
RS Stock No. 620-0739
Mfr. Part No.TPS3824-50DBVT
MYR6.79
Each (In a Pack of 10)
units
Processor 1 Yes - 4.64V - 4.46V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V
RS Stock No. 162-7178
Mfr. Part No.TPS3824-50DBVR
MYR4.369
Each (On a Reel of 3000)
units
- 1 Yes - - - - Active High, Active Low - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.64V
RS Stock No. 686-4784
Mfr. Part No.STM1061N34WX6F
MYR1.82
Each (In a Pack of 25)
units
Low Power Voltage Detector 1 - - 3.468V - 3.332V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm -
RS Stock No. 121-8484
Mfr. Part No.TL7705ACP
MYR3.066
Each (In a Tube of 50)
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
MYR0.761
Each (On a Reel of 3000)
units
Low Power Voltage Detector 1 - - 3.468V - 3.332V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm -
RS Stock No. 662-3435
Mfr. Part No.TPS3824-50DBVR
MYR6.99
Each (In a Pack of 5)
units
- 1 Yes - - - - Active High, Active Low - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.64V
RS Stock No. 145-7113
Mfr. Part No.TPS3824-50DBVT
MYR5.44
Each (On a Reel of 250)
units
- 1 Yes - - - - - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V
RS Stock No. 159-5032
Mfr. Part No.TL7705ACP
MYR3.69
Each
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V
RS Stock No. 189-2136
Mfr. Part No.STM1061N31WX6F
MYR1.897
Each (In a Pack of 25)
units
Voltage Detector 1 - - 3.162V - 3.038V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 5.5V
RS Stock No. 624-8315
Mfr. Part No.STM6823TWY6F
MYR5.996
Each (In a Pack of 10)
units
Microprocessor Voltage Monitor 1 Yes Yes 3.11V - 3.04V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm -
RS Stock No. 170-4300
Mfr. Part No.MCP100-475DI/TO
BrandMicrochip
MYR1.15
Each (In a Bag of 1000)
units
- - - - - - - - - - - - - -
RS Stock No. 526-779
Mfr. Part No.TPS3823-33DBVR
MYR7.03
Each (In a Pack of 5)
units
Supervisory Circuits with Watchdog 1 Yes Yes 3V - 2.86V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V
RS Stock No. 806-2488
Mfr. Part No.MAX809JTRG
MYR1.743
Each (On a Tape of 25)
units
- 1 No - - No - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.1V
RS Stock No. 620-0723
Mfr. Part No.TPS3823-33DBVT
MYR5.565
Each (In a Pack of 10)
units
Supervisory Circuits with Watchdog 1 Yes Yes 3V - 2.86V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V
RS Stock No. 163-0448
Mfr. Part No.MAX809JTRG
MYR0.708
Each (On a Reel of 3000)
units
- 1 No - - No - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.1V
RS Stock No. 738-6297
Mfr. Part No.MCP1317T-29LE/OT
BrandMicrochip
MYR2.848
Each (In a Pack of 5)
units
- 1 Yes Yes - - - Active High, Push-Pull 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.97V