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. 168-6324
Mfr. Part No.STM811SW16F
£0.149
Each (On a Reel of 3000)
Units
- 1 - Yes - - - Active Low, Push-Pull 280ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.02mm 3V
RS Stock No. 165-2262
Mfr. Part No.TCM810TVNB713
BrandMicrochip
£0.198
Each (On a Reel of 3000)
Units
Microcontroller Reset Monitor 1 - - 3.15V - 3V - - Surface Mount SOT-23B 3 3.04 x 2.64 x 1.12mm 5V
RS Stock No. 624-8371
Mfr. Part No.STM811SW16F
£0.355
Each (In a Pack of 10)
Units
- 1 - Yes - - - Active Low, Push-Pull 280ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.02mm 3V
RS Stock No. 774-7387
Mfr. Part No.TCM810TVNB713
BrandMicrochip
£0.277
Each (In a Bag of 15)
Units
Microcontroller Reset Monitor 1 - - 3.15V - 3V - - Surface Mount SOT-23B 3 3.04 x 2.64 x 1.12mm 5V
RS Stock No. 178-5333
Mfr. Part No.MCP103T-315E/TT
BrandMicrochip
£0.064
Each (On a Reel of 3000)
Units
Micropower 1 - - 0.185V - 0.031V - - Surface Mount SOT-23 3 3.05 x 1.4 x 1.02mm 3.157V
RS Stock No. 121-8854
Mfr. Part No.LM809M3-3.08/NOPB
£0.298
Each (On a Reel of 1000)
Units
- 1 - - - - - Active Low 840ms Surface Mount SOT-23 3 2.92 x 1.3 x 0.93mm 3.15V
RS Stock No. 884-2669
Mfr. Part No.LTC2918IMS-B1#PBF
£2.578
Each (In a Pack of 5)
Units
Voltage Monitor 1 Yes Yes 1.71V - 1.656V - - Surface Mount MSOP 10 3 x 3 x 0.86mm 1.8V
RS Stock No. 825-0925
Mfr. Part No.MCP103T-315E/TT
BrandMicrochip
£0.08
Each (In a Pack of 20)
Units
Micropower 1 - - 0.185V - 0.031V - - Surface Mount SOT-23 3 3.05 x 1.4 x 1.02mm 3.157V
RS Stock No. 536-0054
Mfr. Part No.LM809M3-3.08/NOPB
£0.446
Each (In a Pack of 5)
Units
- 1 - - - - - Active Low 840ms Surface Mount SOT-23 3 2.92 x 1.3 x 0.93mm 3.15V
RS Stock No. 620-1142
Mfr. Part No.TPS3808G01DBVT
£1.244
Each (In a Pack of 5)
Units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm -
RS Stock No. 178-8940
Mfr. Part No.LTC4365ITS8#TRMPBF
£1.94
Each (On a Reel of 2500)
Units
Overvoltage Monitor, Undervoltage Monitor 3 - - - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 667-4219
Mfr. Part No.MCP130T-270I/TT
BrandMicrochip
£0.36
Each (In a Pack of 10)
Units
- 1 - - - - - Active Low, Open Drain 700ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 2.7V
RS Stock No. 165-4887
Mfr. Part No.MCP130T-270I/TT
BrandMicrochip
£0.259
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Open Drain 700ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 2.7V
RS Stock No. 906-3316
Mfr. Part No.LTC4365ITS8#TRMPBF
£3.275
Each (In a Pack of 4)
Units
Overvoltage Monitor, Undervoltage Monitor 3 - - - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 121-8971
Mfr. Part No.TPS3808G01DBVT
£0.744
Each (On a Reel of 250)
Units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm -
RS Stock No. 516-5067
Mfr. Part No.MC34064P-5G
£0.50
Each
Units
- 1 - - - - - - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 4.7V
RS Stock No. 517-1781
Mfr. Part No.TL7705AID
£0.449
Each (In a Pack of 10)
Units
Supply 1 - - 4.6V - 4.5V - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 10V
RS Stock No. 155-7569
Mfr. Part No.LTC2954CTS8-2#TRMPBF
£2.157
Each (On a Reel of 500)
Units
- - - - 1V - 0.6V - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 662-4113
Mfr. Part No.TL7705AIDR
£0.363
Each (In a Pack of 10)
Units
Supply 1 - - 4.6V - 4.5V - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 10V
RS Stock No. 768-1508
Mfr. Part No.TC54VC4302ECB713
BrandMicrochip
£0.404
Each (In a Pack of 15)
Units
- 1 - - - - - Active Low, CMOS - Surface Mount SOT-23A 3 3.1 x 1.8 x 1.3mm 4.39V