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 Minimum Reset Threshold Voltage Mounting Type Package Type Pin Count Dimensions Maximum Monitored Voltage Maximum Operating Supply Voltage Automotive Standard Maximum Operating Temperature
RS Stock No. 158-0419
Mfr. Part No.LTC4365IDDB#TRMPBF
€2.228
Each (On a Reel of 500)
units
Overvoltage Protection, Reverse Supply Protection, Undervoltage Protection 3 - - - - Surface Mount DFN 8 3 x 2 x 0.7mm - 34 V - +85 °C
RS Stock No. 906-3319
Mfr. Part No.LTC4365IDDB#TRMPBF
€3.635
Each (In a Pack of 4)
units
Overvoltage Protection, Reverse Supply Protection, Undervoltage Protection 3 - - - - Surface Mount DFN 8 3 x 2 x 0.7mm - 34 V - +85 °C
RS Stock No. 761-8982
Mfr. Part No.LTC1326IS8-2.5#PBF
€4.28
Each
units
Micropower Triple Supply Monitor 3 - Yes 2.381V 2.312V Surface Mount SOIC 8 5 x 3.99 x 1.09mm 2.5V 7 V - +85 °C
RS Stock No. 178-8993
Mfr. Part No.TPS3103K33DBVT
€2.802
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 3.3 V - +85 °C
RS Stock No. 145-7366
Mfr. Part No.TL7709ACP
€0.567
Each (In a Tube of 50)
units
Supply 1 - - 7.7V 7.5V Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 15V 18 V - +70 °C
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
€0.138
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 - 6 V - +85 °C
RS Stock No. 700-3107
Mfr. Part No.BD4830G-TR
BrandROHM
€0.307
Each (In a Pack of 20)
units
Voltage Detector 1 - - 3.045V 2.955V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
RS Stock No. 162-7171
Mfr. Part No.TPS3809L30DBVT
€0.403
Each (On a Reel of 250)
units
Supply 1 - - 2.7V 2.58V Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm - 6 V - +85 °C
RS Stock No. 620-0694
Mfr. Part No.TPS3823-50DBVT
€0.936
Each (In a Pack of 10)
units
Processor 1 Yes Yes 4.64V 4.46V Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V 5.5 V - +85 °C
RS Stock No. 169-0503
Mfr. Part No.BD4830G-TR
BrandROHM
€0.105
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.045V 2.955V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
RS Stock No. 163-0562
Mfr. Part No.MC34064P-5RAG
€0.203
Each (On a Reel of 2000)
units
Undervoltage Sensing Circuit 1 - - 4.7V 4.5V Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V 6.5 V - +70 °C
RS Stock No. 121-6412
Mfr. Part No.CAT811STBI-GT3
€0.084
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 5.5 V - +85 °C
RS Stock No. 662-4854
Mfr. Part No.TL7709ACP
€0.572
Each (In a Pack of 5)
units
Supply 1 - - 7.7V 7.5V Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 15V 18 V - +70 °C
RS Stock No. 709-9048
Mfr. Part No.TPD12S520DBTR
€1.032
Each (In a Pack of 5)
units
- - - - - - Surface Mount TSSOP 38 9.7 x 4.4 x 1.15mm - - - +85 °C
RS Stock No. 662-4236
Mfr. Part No.TPS3809L30DBVT
€0.625
Each (In a Pack of 10)
units
Supply 1 - - 2.7V 2.58V Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm - 6 V - +85 °C
RS Stock No. 662-4157
Mfr. Part No.TPS3103K33DBVT
€2.322
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 3.3 V - +85 °C
RS Stock No. 121-8959
Mfr. Part No.TPS3823-50DBVT
€0.877
Each (On a Reel of 250)
units
Processor 1 Yes Yes 4.64V 4.46V Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 5.8V 5.5 V - +85 °C
RS Stock No. 686-4784
Mfr. Part No.STM1061N34WX6F
€0.356
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 - 6 V - +85 °C
RS Stock No. 789-3925
Mfr. Part No.CAT811STBI-GT3
€0.084
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 5.5 V - +85 °C
RS Stock No. 806-2093
Mfr. Part No.MC34064P-5RAG
€0.443
Each (In a Pack of 20)
units
Undervoltage Sensing Circuit 1 - - 4.7V 4.5V Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V 6.5 V - +70 °C
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