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. 169-7365
Mfr. Part No.APX809-40SAG-7
€0.061
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - Active Low 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 4.08V
New
RS Stock No. 213-9132
Mfr. Part No.APX803L-33W5-7
€0.157
Each (On a Reel of 3000)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
RS Stock No. 169-0665
Mfr. Part No.APX823-29W5G-7
€0.124
Each (On a Reel of 3000)
units
Power On Reset Circuit 1 Yes Yes 3V - 2.86V - - Surface Mount SOT-25 5 3.1 x 1.7 x 1.3mm 5V
RS Stock No. 822-8925
Mfr. Part No.APX823-26W5G-7
€0.072
Each (In a Pack of 25)
units
Microprocessor Reset Monitor 1 Yes Yes - - - Active Low 280ms Surface Mount SOT-25 5 3.1 x 1.7 x 1.3mm 2.69V
New
RS Stock No. 213-9137
Mfr. Part No.APX803L-50W5-7
€0.249
Each (In a Pack of 50)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
RS Stock No. 828-7652
Mfr. Part No.APX803-46SAG-7
€0.289
Each (In a Pack of 50)
units
Microcontroller Reset Monitor 1 - Yes 4.7V - 4.56V - - Surface Mount SOT-23 3 3 x 1.4 x 1mm 5V
New
RS Stock No. 213-9126
Mfr. Part No.APX803L-12W5-7
€0.157
Each (On a Reel of 3000)
units
Microprocessor Supervisory Circuit 1 No Yes 5V - - - - - SOT25 5 - -
RS Stock No. 712-2778
Mfr. Part No.APX809-29SAG-7
€0.24
Each (In a Pack of 25)
units
Microprocessor Reset Monitor 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 3V
New
RS Stock No. 213-9129
Mfr. Part No.APX803L-18W5-7
€0.249
Each (In a Pack of 50)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
New
RS Stock No. 213-9136
Mfr. Part No.APX803L-50W5-7
€0.157
Each (On a Reel of 3000)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
New
RS Stock No. 213-9133
Mfr. Part No.APX803L-33W5-7
€0.249
Each (In a Pack of 50)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
RS Stock No. 169-7376
Mfr. Part No.APX803-26SAG-7
€0.089
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - Active Low 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 2.66V
RS Stock No. 122-0668
Mfr. Part No.APX809-31SAG-7
€0.059
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 3.15V
RS Stock No. 169-7379
Mfr. Part No.APX823-26W5G-7
€0.08
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 Yes Yes - - - Active Low 280ms Surface Mount SOT-25 5 3.1 x 1.7 x 1.3mm 2.69V
RS Stock No. 165-8316
Mfr. Part No.APX823-46W5G-7
€0.075
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 Yes Yes - - - Active Low 280ms Surface Mount SOT-25 5 3.1 x 1.7 x 1.3mm 4.72V
New
RS Stock No. 213-9131
Mfr. Part No.APX803L-30W5-7
€0.249
Each (In a Pack of 50)
units
Microprocessor Supervisory Circuit 1 - Yes 5V - - - - - SOT25 5 - -
RS Stock No. 165-8314
Mfr. Part No.APX809-29SRG-7
€0.056
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - Yes - - - Active Low 280ms Surface Mount SOT-23R 3 3 x 1.4 x 1mm 3V
RS Stock No. 822-8928
Mfr. Part No.APX823-31W5G-7
€0.309
Each (In a Pack of 25)
units
Microprocessor Reset Monitor 1 Yes Yes - - - Active Low 280ms Surface Mount SOT-25 5 3.1 x 1.7 x 1.3mm 3.15V
RS Stock No. 169-0625
Mfr. Part No.APX809-46SAG-7
€0.085
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 4.72V
RS Stock No. 712-2781
Mfr. Part No.APX809-31SAG-7
€0.055
Each (In a Pack of 25)
units
Microprocessor Reset Monitor 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 3.15V