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. 159-5032
Mfr. Part No.TL7705ACP
£0.56
Each
Units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V
RS Stock No. 121-8484
Mfr. Part No.TL7705ACP
£0.473
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
RS Stock No. 165-7649
Mfr. Part No.STM1061N34WX6F
£0.124
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. 686-4784
Mfr. Part No.STM1061N34WX6F
£0.321
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. 822-6815
Mfr. Part No.LTC4365CTS8#TRMPBF
£2.98
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
£1.767
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. 189-1870
Mfr. Part No.STM1061N31WX6F
£0.13
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
RS Stock No. 163-0682
Mfr. Part No.NCP303LSN30T1G
£0.142
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. 189-2136
Mfr. Part No.STM1061N31WX6F
£0.334
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
RS Stock No. 808-0158
Mfr. Part No.NCP303LSN30T1G
£0.222
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. 189-1871
Mfr. Part No.STM1818SWX7F
£0.192
Each (On a Reel of 3000)
Units
- 1 - Yes - - - Active Low, Open Drain 200ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 3 V, 3.3V
RS Stock No. 768-1520
Mfr. Part No.TC54VN3002ECB713
BrandMicrochip
£0.366
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 3.06V
RS Stock No. 189-1932
Mfr. Part No.STM1818SWX7F
£0.458
Each (In a Pack of 25)
Units
- 1 - Yes - - - Active Low, Open Drain 200ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 3 V, 3.3V
RS Stock No. 165-3587
Mfr. Part No.TC54VN3002ECB713
BrandMicrochip
£0.275
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Open Drain - Surface Mount SOT-23A 3 3.1 x 1.8 x 1.3mm 3.06V
RS Stock No. 168-6391
Mfr. Part No.STM1061N28WX6F
£0.127
Each (On a Reel of 3000)
Units
Low Power Voltage Detector 1 - - 2.856V - 2.744V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm -
RS Stock No. 686-4796
Mfr. Part No.STM1061N28WX6F
£0.328
Each (In a Pack of 25)
Units
Low Power Voltage Detector 1 - - 2.856V - 2.744V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm -
RS Stock No. 168-7276
Mfr. Part No.TL7705BCP
£0.65
Each
Units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 18V
RS Stock No. 162-4342
Mfr. Part No.TL7705BCP
£0.531
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 18V
RS Stock No. 624-8264
Mfr. Part No.STM1816SWX7F
£0.384
Each (In a Pack of 10)
Units
- 1 - - - - - Active Low, Open Drain - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 2.97V
RS Stock No. 168-6320
Mfr. Part No.STM1816SWX7F
£0.152
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Open Drain - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 2.97V
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