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. 662-4227
Mfr. Part No.TPS3809K33DBVT
HK$6.128
Each (In a Pack of 10)
units
Supply 1 - - 2.99V 2.87V Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm - 6 V - +85 °C
RS Stock No. 121-9204
Mfr. Part No.TPS3809K33DBVT
HK$3.952
Each (On a Reel of 250)
units
Supply 1 - - 2.99V 2.87V Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm - 6 V - +85 °C
RS Stock No. 169-0502
Mfr. Part No.BD4842G-TR
BrandROHM
HK$1.045
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 4.263V 4.137V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
RS Stock No. 700-3104
Mfr. Part No.BD4842G-TR
BrandROHM
HK$3.012
Each (In a Pack of 20)
units
Voltage Detector 1 - - 4.263V 4.137V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
RS Stock No. 121-8959
Mfr. Part No.TPS3823-50DBVT
HK$10.31
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. 620-0694
Mfr. Part No.TPS3823-50DBVT
HK$9.187
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. 189-2136
Mfr. Part No.STM1061N31WX6F
HK$3.79
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 6 V - +85 °C
RS Stock No. 189-1870
Mfr. Part No.STM1061N31WX6F
HK$1.463
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.162V 3.038V Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 5.5V 6 V - +85 °C
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
HK$1.463
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. 121-8484
Mfr. Part No.TL7705ACP
HK$5.045
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 18 V - +70 °C
RS Stock No. 700-3132
Mfr. Part No.BD5230G-TR
BrandROHM
HK$2.907
Each (In a Pack of 20)
units
Voltage Detector 1 - - 3.03V 2.97V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
RS Stock No. 165-7703
Mfr. Part No.STM1061N25WX6F
HK$1.349
Each (On a Reel of 3000)
units
Low Power Voltage Detector 1 - - 2.55V 2.45V Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm - 6 V - +85 °C
RS Stock No. 686-4778
Mfr. Part No.STM1061N25WX6F
HK$3.79
Each (In a Pack of 25)
units
Low Power Voltage Detector 1 - - 2.55V 2.45V Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm - 6 V - +85 °C
RS Stock No. 121-6412
Mfr. Part No.CAT811STBI-GT3
HK$1.253
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. 159-5032
Mfr. Part No.TL7705ACP
HK$6.61
Each
units
Supply 1 - - 4.6V 4.5V Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V 18 V - +70 °C
RS Stock No. 789-3925
Mfr. Part No.CAT811STBI-GT3
HK$3.15
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. 806-7966
Mfr. Part No.AD8280WASTZ
HK$70.65
Each
units
Battery Backup Monitor - - - 4.6V 3.6V Surface Mount LQFP 48 7.2 x 7.2 x 1.45mm - 30 V - +105 °C
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 5.5 V - +105 °C
RS Stock No. 808-0158
Mfr. Part No.NCP303LSN30T1G
HK$2.375
Each (On a Tape of 100)
units
Voltage Monitor 1 - - 4.4V 2.59V Surface Mount TSOP 5 3 x 1.5 x 1mm - 10 V - +125 °C
RS Stock No. 789-3929
Mfr. Part No.CAT811TTBI-GT3
HK$2.956
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 5.5 V - +85 °C
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