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. 686-4784
Mfr. Part No.STM1061N34WX6F
R 6.92
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. 165-7649
Mfr. Part No.STM1061N34WX6F
R 2.688
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. 165-2159
Mfr. Part No.MCP1316MT-29ME/OT
BrandMicrochip
R 8.563
Each (On a Reel of 3000)
units
Micropower 1 Yes Yes 0.174V - 0.029V - - Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.9V
RS stock no. 823-3469
Mfr. Part No.MCP1316MT-29ME/OT
BrandMicrochip
R 10.369
Each (In a Pack of 20)
units
Micropower 1 Yes Yes 0.174V - 0.029V - - Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.9V
RS stock no. 738-6382
Mfr. Part No.MCP100T-300I/TT
BrandMicrochip
R 6.002
Each (In a Pack of 10)
units
- 1 - - - - - Active Low, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 3V
RS stock no. 686-1542
Mfr. Part No.STM6821LWY6F
R 3.99
Each (In a Pack of 5)
units
- 1 Yes Yes - - - Active High, Push-Pull 280ms Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.74V
RS stock no. 178-5293
Mfr. Part No.MCP100T-300I/TT
BrandMicrochip
R 4.586
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 3V
RS stock no. 168-6342
Mfr. Part No.STM6821LWY6F
R 3.735
Each (On a Reel of 3000)
units
- 1 Yes Yes - - - Active High, Push-Pull 280ms Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.74V
RS stock no. 189-1870
Mfr. Part No.STM1061N31WX6F
R 2.795
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. 189-2136
Mfr. Part No.STM1061N31WX6F
R 7.211
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. 700-3113
Mfr. Part No.BD4845G-TR
BrandROHM
R 6.153
Each (In a Pack of 20)
units
Open Drain Voltage Detector 1 - - 4.568V - 4.433V - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V
RS stock no. 805-2034
Mfr. Part No.NCP301LSN30T1G
R 6.088
Each (In a Pack of 25)
units
Ultra Low Supply Current 1 - - 2.94V - 3.06V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS stock no. 823-0123
Mfr. Part No.LTC1153CS8#PBF
R 47.585
Each (In a Pack of 2)
units
- - - - 3.2V - 2V - - Surface Mount SOIC 8 5 x 3.99 x 1.5mm -
RS stock no. 162-9020
Mfr. Part No.NCP301LSN30T1G
R 2.469
Each (On a Reel of 3000)
units
Ultra Low Supply Current 1 - - 2.94V - 3.06V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS stock no. 124-6491
Mfr. Part No.BD87A29FVM-TR
BrandROHM
R 25.406
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. 162-9013
Mfr. Part No.NCP301HSN30T1G
R 2.738
Each (On a Reel of 3000)
units
Ultra Low Supply Current 1 No No 3.06V - 2.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS stock no. 162-7171
Mfr. Part No.TPS3809L30DBVT
R 8.072
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. 802-4243
Mfr. Part No.NCP301HSN30T1G
R 6.923
Each (On a Tape of 25)
units
Ultra Low Supply Current 1 No No 3.06V - 2.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS stock no. 165-3586
Mfr. Part No.TC54VN2702ECB713
BrandMicrochip
R 5.972
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 2.75V
RS stock no. 768-1518
Mfr. Part No.TC54VN2702ECB713
BrandMicrochip
R 7.141
Each (In a Pack of 15)
units
- 1 - - - - - Active Low, Open Drain - Surface Mount SOT-23A 3 3.1 x 1.8 x 1.3mm 2.75V