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. 700-3132
Mfr. Part No.BD5230G-TR
BrandROHM
HK$3.213
Each (In a Pack of 20)
units
Open Drain Voltage Detector 1 - - 3.03V - 2.97V - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V
RS Stock No. 523-7392
Mfr. Part No.ADM705ANZ
HK$23.99
Each
units
- 1 Yes Yes - Yes - Active Low, Push-Pull 280ms Through Hole PDIP 8 9.27 x 7.24 x 3.43mm 4.75V
RS Stock No. 156-5701
Mfr. Part No.LTC2912ITS8-2#TRMPBF
HK$27.522
Each (On a Reel of 500)
units
Overvoltage Monitor, Undervoltage Monitor 1 - - - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm 3.3V
RS Stock No. 412-860
Mfr. Part No.ADM691ARZ
HK$36.362
Each (In a Pack of 5)
units
Microprocessor Supervisory Circuit 1 Yes - - Yes - Active High, Active Low, Push-Pull 70ms Surface Mount SOIC 16 - 4.75V
RS Stock No. 163-2441
Mfr. Part No.MAX809SN232T1G
HK$1.418
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. 578-853
Mfr. Part No.STM6719SFWB6F
HK$8.264
Each (In a Pack of 5)
units
Dual/Triple Ultra Low 3 - Yes 3V - 1.02V - - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 5.5V
RS Stock No. 162-9884
Mfr. Part No.TPS3701DDCT
HK$15.005
Each (On a Reel of 250)
units
- - - - - - - - - Surface Mount SOT-23 6 3.05 x 1.75 x 1mm -
RS Stock No. 168-6322
Mfr. Part No.STM6823TWY6F
HK$5.849
Each (On a Reel of 3000)
units
Microprocessor Voltage Monitor 1 Yes Yes 3.11V - 3.04V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm -
RS Stock No. 808-0158
Mfr. Part No.NCP303LSN30T1G
HK$3.297
Each (On a Tape of 100)
units
Voltage Monitor 1 - - 4.4V - 2.59V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 163-0682
Mfr. Part No.NCP303LSN30T1G
HK$1.883
Each (On a Reel of 3000)
units
Voltage Monitor 1 - - 4.4V - 2.59V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
HK$1.596
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. 806-0760
Mfr. Part No.NCP302HSN27T1G
HK$4.515
Each (On a Tape of 25)
units
Voltage Detector 1 - - 2.781V - 2.619V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 144-9251
Mfr. Part No.TC1232CPA
BrandMicrochip
HK$11.592
Each (In a Tube of 60)
units
- 1 Yes Yes - Yes - Active High, Active Low, Open Drain, Push-Pull 1000ms Through Hole PDIP 8 10.16 x 6.6 x 4.06mm 4.49 V, 4.74V
RS Stock No. 900-9813
Mfr. Part No.TPS3701DDCT
HK$25.158
Each (In a Pack of 5)
units
- - - - - - - - - Surface Mount SOT-23 6 3.05 x 1.75 x 1mm -
RS Stock No. 773-7706
Mfr. Part No.MAX809SN232T1G
HK$3.948
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. 121-6412
Mfr. Part No.CAT811STBI-GT3
HK$1.441
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
RS Stock No. 121-8971
Mfr. Part No.TPS3808G01DBVT
HK$9.689
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. 789-3925
Mfr. Part No.CAT811STBI-GT3
HK$3.602
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
RS Stock No. 686-4778
Mfr. Part No.STM1061N25WX6F
HK$4.074
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 -
RS Stock No. 159-5032
Mfr. Part No.TL7705ACP
HK$7.10
Each
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V