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. 922-2149
Mfr. Part No.LM809M3-2.93/NOPB
$0.72
Each (On a Reel of 1000)
units
- 1 - - - - - Active High, Active Low 840ms Surface Mount SOT-23 3 3.048 x 1.194 x 0.94mm 3V
RS Stock No. 761-6084
Mfr. Part No.LM809M3-2.93/NOPB
$1.72
Each (In a Pack of 10)
units
- 1 - - - - - Active High, Active Low 840ms Surface Mount SOT-23 3 3.048 x 1.194 x 0.94mm 3V
RS Stock No. 822-6815
Mfr. Part No.LTC4365CTS8#TRMPBF
$6.205
Each (In a Pack of 2)
units
Overvoltage Protection 1 - - - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 920-0123
Mfr. Part No.LTC4365CTS8#TRMPBF
$3.916
Each (On a Reel of 500)
units
Overvoltage Protection 1 - - - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 155-7569
Mfr. Part No.LTC2954CTS8-2#TRMPBF
$4.79
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. 773-7706
Mfr. Part No.MAX809SN232T1G
Brandonsemi
$0.643
Each (In a Pack of 10)
units
Microprocessor Voltage Monitor 1 - - 2.45V - 2.21V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.9V
RS Stock No. 781-4180
Mfr. Part No.MAX809SN293D3T1G
Brandonsemi
$0.774
Each (In a Pack of 20)
units
Microprocessor Reset Monitor - - - 3.08V - 2.78V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.9V
RS Stock No. 662-4236
Mfr. Part No.TPS3809L30DBVT
$1.339
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 -
RS Stock No. 162-7171
Mfr. Part No.TPS3809L30DBVT
$0.803
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 -
RS Stock No. 124-6491
Mfr. Part No.BD87A29FVM-TR
BrandROHM
$2.528
Each (In a Pack of 5)
units
- 2 Yes - - - - Active Low 10.1ms Surface Mount MSOP 8 2.9 x 2.8 x 0.75mm 2.97V
RS Stock No. 686-4784
Mfr. Part No.STM1061N34WX6F
$0.916
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. 163-0929
Mfr. Part No.MAX809SN293D3T1G
Brandonsemi
$0.298
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor - - - 3.08V - 2.78V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 4.9V
RS Stock No. 906-3319
Mfr. Part No.LTC4365IDDB#TRMPBF
$6.753
Each (In a Pack of 4)
units
Overvoltage Monitor, Undervoltage Monitor 3 - - - - - - - Surface Mount DFN 8 3 x 2 x 0.7mm -
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
$0.377
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. 163-2441
Mfr. Part No.MAX809SN232T1G
Brandonsemi
$0.265
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
RS Stock No. 158-0419
Mfr. Part No.LTC4365IDDB#TRMPBF
$4.182
Each (On a Reel of 500)
units
Overvoltage Monitor, Undervoltage Monitor 3 - - - - - - - Surface Mount DFN 8 3 x 2 x 0.7mm -
RS Stock No. 822-6821
Mfr. Part No.LTC2954CTS8-2#TRMPBF
$8.64
Each (In a Pack of 2)
units
- - - - 1V - 0.6V - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm -
RS Stock No. 768-1533
Mfr. Part No.TC54VN4502ECB713
BrandMicrochip
$0.947
Each (On a Tape of 15)
units
- 1 - - - - - Active Low, Open Drain - Surface Mount SOT-23A 3 3.1 x 1.8 x 1.3mm 4.6V
RS Stock No. 806-0817
Mfr. Part No.NCP303LSN47T1G
Brandonsemi
$0.874
Each (In a Pack of 25)
units
Voltage Detector 1 - - 4.841V - 4.559V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 169-5631
Mfr. Part No.TL7705ACDR
$0.552
Each (On a Reel of 2500)
units
Supply 1 - - 4.6V - 4.5V - - Surface Mount SOIC 8 4.9 x 3.91 x 1.58mm 10V