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. 624-8315
Mfr. Part No.STM6823TWY6F
HK$13.839
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 -
RS Stock No. 168-7321
Mfr. Part No.STM809TWX6F
HK$1.428
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. 412-860
Mfr. Part No.ADM691ARZ
HK$42.73
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. 620-1142
Mfr. Part No.TPS3808G01DBVT
HK$15.362
Each (In a Pack of 5)
units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm -
RS Stock No. 667-4262
Mfr. Part No.TC1232CPA
BrandMicrochip
HK$13.924
Each (In a Pack of 5)
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. 686-4784
Mfr. Part No.STM1061N34WX6F
HK$4.582
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. 168-5838
Mfr. Part No.STM6719SFWB6F
HK$4.242
Each (On a Reel of 3000)
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. 165-7703
Mfr. Part No.STM1061N25WX6F
HK$2.069
Each (On a Reel of 3000)
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. 190-1513
Mfr. Part No.MAX690EPA+
HK$75.56
Each
units
- 1 Yes - - Yes - Active Low, Push-Pull 70ms Through Hole PDIP 8 9.91 x 7.87 x 4.45mm 4.75V
RS Stock No. 662-4898
Mfr. Part No.TLC7701QP
HK$17.158
Each (In a Pack of 5)
units
Micropower Supply 1 - - 1.16V - 1.04V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm -
RS Stock No. 742-7705
Mfr. Part No.ADM1085AKSZ-REEL7
HK$9.054
Each (In a Pack of 5)
units
Simple Sequencer 1 - - 0.64V - 0.56V - - Surface Mount SC-70 6 2.2 x 1.35 x 1mm 22V
RS Stock No. 379-2106
Mfr. Part No.MCP100T-475I/TT
BrandMicrochip
HK$3.412
Each (In a Pack of 5)
units
- 1 - - - - - Active Low, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 4.75V
RS Stock No. 163-0452
Mfr. Part No.MAX809SQ293D1T1G
HK$2.048
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Push-Pull 3.3ms Surface Mount SC-70 3 2.2 x 1.35 x 0.9mm 3V
RS Stock No. 168-1269
Mfr. Part No.BU4230FVE-TR
BrandROHM
HK$4.946
Each (In a Pack of 25)
units
Open Drain Voltage Detector 1 - - - - - - - Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm 3.13V
RS Stock No. 165-3506
Mfr. Part No.MCP112T-240E/TT
BrandMicrochip
HK$3.234
Each (On a Reel of 3000)
units
- 1 - - - Yes - Active Low 130ms Surface Mount SOT-23B 3 3.04 x 1.4 x 1.02mm 2.37V
RS Stock No. 761-3767
Mfr. Part No.MAX1232CSA+T
HK$30.01
Each
units
- 1 Yes Yes - - - Active Low, Open Drain 1000ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.49 V, 4.74V
RS Stock No. 714-7878
Mfr. Part No.STM809RWX6F
HK$3.623
Each (In a Pack of 20)
units
- 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 2.7V
RS Stock No. 159-8044
Mfr. Part No.ADM811SARTZ-REEL7
HK$7.482
Each (On a Reel of 3000)
units
- 1 - Yes - - - Active Low 560ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 3V
RS Stock No. 578-893
Mfr. Part No.STM809LWX6F
HK$4.852
Each (In a Pack of 5)
units
- 1 - - - - - Active Low, Push-Pull 280ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 4.75V
RS Stock No. 912-2972
Mfr. Part No.MCP130T-450I/TT
BrandMicrochip
HK$3.234
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Open Drain 700ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 4.5V