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. 806-2093
Mfr. Part No.MC34064P-5RAG
€0.462
Each (In a Pack of 20)
units
Undervoltage Detector 1 - - 4.7V - 4.5V - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V
RS Stock No. 163-0449
Mfr. Part No.MAX809SN160T1G
€0.13
Each (On a Reel of 3000)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 1.64V
RS Stock No. 163-0445
Mfr. Part No.MAX708TESA-TG
€0.223
Each (On a Reel of 2500)
units
- 1 - Yes - Yes - Active High, Active Low, Push-Pull 200ms Surface Mount SOIC 8 5 x 4 x 1.5mm 3.15V
RS Stock No. 163-0562
Mfr. Part No.MC34064P-5RAG
€0.223
Each (On a Reel of 2000)
units
Undervoltage Detector 1 - - 4.7V - 4.5V - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V
RS Stock No. 806-2481
Mfr. Part No.MAX809SN160T1G
€0.316
Each (In a Pack of 25)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.01mm 1.64V
RS Stock No. 121-6412
Mfr. Part No.CAT811STBI-GT3
€0.088
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. 806-2466
Mfr. Part No.MAX708TESA-TG
€0.228
Each (On a Tape of 20)
units
- 1 - Yes - Yes - Active High, Active Low, Push-Pull 200ms Surface Mount SOIC 8 5 x 4 x 1.5mm 3.15V
RS Stock No. 789-3925
Mfr. Part No.CAT811STBI-GT3
€0.084
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. 802-4029
Mfr. Part No.NCP303LSN36T1G
€0.11
Each (On a Tape of 25)
units
Undervoltage Detector 1 No No 3.672V - 3.528V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 463-224
Mfr. Part No.MC33064P-5G
€0.459
Each (In a Pack of 20)
units
Undervoltage Detector 1 - - 4.7V - 4.5V - - Through Hole TO-92 3 5.2 x 4.19 x 5.33mm -
RS Stock No. 805-1961
Mfr. Part No.NCP301LSN45T1G
€0.328
Each (On a Tape of 25)
units
Ultra Low Supply Current 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 802-4032
Mfr. Part No.NCP301HSN45T1G
€0.355
Each (On a Tape of 25)
units
Ultra Low Supply Current 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 163-0447
Mfr. Part No.MAX803SQ293T1G
€0.19
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - - - Surface Mount SC-70 3 2.2 x 1.35 x 0.9mm -
RS Stock No. 802-4146
Mfr. Part No.NCP302LSN15T1G
€0.402
Each (On a Tape of 25)
units
Undervoltage Detector 1 - - 1.53V - 1.470V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 688-8809
Mfr. Part No.MAX809STRG
€0.39
Each (In a Pack of 2)
units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.94mm 3V
RS Stock No. 163-0442
Mfr. Part No.MAX708ESA-TG
€0.287
Each (On a Reel of 2500)
units
- 1 - Yes - Yes - Active High, Active Low, Push-Pull 200ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.5V
RS Stock No. 805-2028
Mfr. Part No.NCP300LSN44T1G
€0.12
Each (On a Tape of 25)
units
Ultra Low Supply Current 1 - - 4.488V - 4.312V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 805-2034
Mfr. Part No.NCP301LSN30T1G
€0.316
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. 163-0702
Mfr. Part No.NCP305LSQ36T1G
€0.123
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.672V - 3.528V - - Surface Mount SC-82AB 4 2.2 x 1.35 x 1mm 4.9V
RS Stock No. 163-0444
Mfr. Part No.MAX708SESA-TG
€0.194
Each (On a Reel of 2500)
units
- 1 - Yes - Yes - Active High, Active Low, Push-Pull 200ms Surface Mount SOIC 8 5 x 4 x 1.5mm 3V