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 Minimum Reset Threshold Voltage Mounting Type Package Type Pin Count Dimensions Maximum Monitored Voltage Maximum Operating Supply Voltage Automotive Standard Maximum Operating Temperature
RS Stock No. 806-2093
Mfr. Part No.MC34064P-5RAG
PHP25.641
Each (In a Pack of 20)
units
Undervoltage Sensing Circuit 1 - - 4.7V 4.5V Through Hole TO-92 3 5.2 x 4.19 x 5.33mm 5V 6.5 V - +70 °C
RS Stock No. 799-7973
Mfr. Part No.MAX693ACPE+
PHP406.35
Each
units
Voltage Monitor 1 Yes - 4.5V 4.25V Through Hole PDIP 16 19.43 x 7.87 x 4.45mm 5.5V 5.5 V - +70 °C
RS Stock No. 162-7205
Mfr. Part No.UC2903DW
PHP309.75
Each (In a Tube of 40)
units
Quad Supply and Line Monitor 4 - - - - Surface Mount SOIC 18 11.62 x 7.52 x 2.35mm - 40 V - +85 °C
RS Stock No. 162-9007
Mfr. Part No.NCP300LSN30T1G
PHP8.19
Each (On a Reel of 3000)
units
Ultra Low Supply Current 1 - - 3.06V 2.94V Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V 10 V - +125 °C
RS Stock No. 190-1764
Mfr. Part No.MAX6820UT+T
PHP267.00
Each (In a Pack of 2)
units
Power Supply Sequencer 2 - - - - Surface Mount SOT-23 6 3 x 1.75 x 1.3mm - 5.5 V - +125 °C
RS Stock No. 191-5301
Mfr. Part No.MAX805LESA+
PHP495.663
Each (In a Tube of 100)
units
Micro Processor 1 - - - - Surface Mount SO 8 5 x 4 x 1.5mm 4.75V 5.5 V - +85 °C
RS Stock No. 731-7248
Mfr. Part No.BU4230G-TR
BrandROHM
PHP21.05
Each (In a Pack of 10)
units
CMOS Voltage Detector 1 - - 3.03V 2.97V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm - 6.5 V - +125 °C
RS Stock No. 170-8216
Mfr. Part No.ICL7665SACPAZ
PHP152.853
Each (In a Tube of 50)
units
Micropower Voltage Detector 2 - - 1.325V 1.275V Through Hole PDIP 8 10.16 x 7.11 x 4.95mm - 16 V - +70 °C
RS Stock No. 158-0330
Mfr. Part No.LTC2918IMS-B1#PBF
PHP126.875
Each (In a Tube of 50)
units
Voltage Single Supply Monitor 1 Yes Yes 1.71V 1.656V Surface Mount MSOP 10 3 x 3 x 0.86mm 1.8V 5.5 V - +85 °C
RS Stock No. 163-0676
Mfr. Part No.NCP302LSN30T1G
PHP7.35
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.06V 2.94V Surface Mount TSOP 5 3 x 1.5 x 1mm - 10 V - +125 °C
RS Stock No. 799-8049
Mfr. Part No.MAX709MCSA+
PHP181.52
Each
units
Power Supply Monitor 1 - - 4.5V 4.25V Surface Mount SOIC 8 5 x 4 x 1.5mm 5.5V 5.5 V - +70 °C
RS Stock No. 159-7582
Mfr. Part No.ADM803SAKSZ-REEL7
PHP22.818
Each (On a Reel of 3000)
units
Microprocessor Supervisory Circuit 1 - - 3.05V 2.81V Surface Mount SC-70 3 2.2 x 1.35 x 1mm 3.3V 5.5 V - +125 °C
RS Stock No. 920-0139
Mfr. Part No.LTC2955CTS8-1#TRMPBF
PHP316.08
Each (On a Reel of 500)
units
Push Button Controller 1 - - 0.84V 0.76V Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm 36V 36 V - +70 °C
RS Stock No. 162-7090
Mfr. Part No.TL7715ACP
PHP70.35
Each (In a Tube of 50)
units
Supply 1 - - 13.8V 13.2V Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 20V 18 V - +70 °C
RS Stock No. 189-7822
Mfr. Part No.MAX6316LUK29CY+T
PHP109.563
Each (On a Reel of 2500)
units
Power Supply Monitor 1 Yes Yes 3V 2.857V Surface Mount SOT-23 5 3 x 1.75 x 1.3mm 5.5V 5.5 V - +125 °C
RS Stock No. 167-7343
Mfr. Part No.BD45295G-TR
BrandROHM
PHP28.67
Each (In a Pack of 20)
units
Open Drain Voltage Detector 1 - Yes - - Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 2.9V 10 V - +105 °C
RS Stock No. 171-7349
Mfr. Part No.BD4837FVE-TR
BrandROHM
PHP21.68
Each (In a Pack of 20)
units
Open Drain Voltage Detector 1 - - - - Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm 3.7V - - +105 °C
RS Stock No. 168-1220
Mfr. Part No.BU4827FVE-TR
BrandROHM
PHP26.174
Each (In a Pack of 25)
units
Open Drain Voltage Detector 1 - - - - Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm 2.7V 7 V - +125 °C
RS Stock No. 923-7850
Mfr. Part No.MAX693ACWE+
PHP316.58
Each (In a Tube of 46)
units
Voltage Monitor 1 Yes - 4.5V 4.25V Surface Mount SOIC 16 10 x 4 x 1.5mm 5.5V 5.5 V - +70 °C
RS Stock No. 169-0503
Mfr. Part No.BD4830G-TR
BrandROHM
PHP7.04
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 3.045V 2.955V Surface Mount SSOP 5 2.9 x 1.6 x 1.1mm 6V 10 V - +105 °C
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