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. 165-3363
Mfr. Part No.MCP1317T-29LE/OT
BrandMicrochip
HK$4.233
Each (On a Reel of 3000)
units
- 1 Yes Yes - - - Active High, Push-Pull 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.97V
RS Stock No. 517-1141
Mfr. Part No.TPS3828-50DBVT
HK$11.722
Each (In a Pack of 5)
units
- 1 Yes Yes - - - Open Drain - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.64V
RS Stock No. 162-4891
Mfr. Part No.TPS3828-50DBVT
HK$7.758
Each (On a Reel of 250)
units
- 1 Yes Yes - - - Open Drain - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 4.64V
RS Stock No. 738-6297
Mfr. Part No.MCP1317T-29LE/OT
BrandMicrochip
HK$5.552
Each (In a Pack of 5)
units
- 1 Yes Yes - - - Active High, Push-Pull 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.97V
RS Stock No. 121-9204
Mfr. Part No.TPS3809K33DBVT
HK$4.928
Each (On a Reel of 250)
units
Supply 1 - - 2.99V - 2.87V - - Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm -
RS Stock No. 662-4227
Mfr. Part No.TPS3809K33DBVT
HK$6.644
Each (In a Pack of 10)
units
Supply 1 - - 2.99V - 2.87V - - Surface Mount SOT-23 3 2.9 x 1.6 x 1.15mm -
RS Stock No. 168-6347
Mfr. Part No.STM6824RWY6F
HK$3.577
Each (On a Reel of 3000)
units
- 1 Yes - - - - Active High, Active Low, Push-Pull 280ms Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 2.69V
RS Stock No. 169-0502
Mfr. Part No.BD4842G-TR
BrandROHM
HK$1.303
Each (On a Reel of 3000)
units
Open Drain Voltage Detector 1 - - 4.263V - 4.137V - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V
RS Stock No. 686-1561
Mfr. Part No.STM6824RWY6F
HK$7.756
Each (In a Pack of 5)
units
- 1 Yes - - - - Active High, Active Low, Push-Pull 280ms Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 2.69V
RS Stock No. 700-3104
Mfr. Part No.BD4842G-TR
BrandROHM
HK$3.265
Each (In a Pack of 20)
units
Open Drain Voltage Detector 1 - - 4.263V - 4.137V - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V
RS Stock No. 662-3387
Mfr. Part No.TPS3813I50DBVT
HK$16.48
Each (In a Pack of 5)
units
- 1 Yes - - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 4.65V
RS Stock No. 189-2136
Mfr. Part No.STM1061N31WX6F
HK$3.79
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. 189-1870
Mfr. Part No.STM1061N31WX6F
HK$1.463
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
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. 168-7321
Mfr. Part No.STM809TWX6F
HK$1.154
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 3.15V
RS Stock No. 789-3925
Mfr. Part No.CAT811STBI-GT3
HK$3.152
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. 121-8484
Mfr. Part No.TL7705ACP
HK$5.469
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. 163-2441
Mfr. Part No.MAX809SN232T1G
HK$1.185
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. 412-860
Mfr. Part No.ADM691ARZ
HK$34.114
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. 624-8315
Mfr. Part No.STM6823TWY6F
HK$12.072
Each (In a Pack of 10)
units
Microprocessor Voltage Monitor 1 Yes Yes 3.11V - 3.04V - - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm -