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. 162-9516
Mfr. Part No.NCP303LSN45T1G
PHP7.35
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 4.59V 4.41V Surface Mount TSOP 5 3 x 1.5 x 1mm - 10 V - +125 °C
RS Stock No. 163-0565
Mfr. Part No.MC34164D-3R2G
PHP12.023
Each (On a Reel of 2500)
units
Micropower Undervoltage Sensing Circuit 1 - Yes 2.8V 2.55V Surface Mount SOIC 8 5 x 4 x 1.5mm 3V 10 V - +70 °C
RS Stock No. 604-9742
Mfr. Part No.NJM2146BD
PHP155.638
Each (In a Pack of 5)
units
- - - - - - Through Hole PDIP 8 8.8 x 6.4 x 3.4mm - - - +85 °C
RS Stock No. 806-2116
Mfr. Part No.MC34164D-3R2G
PHP29.98
Each (On a Tape of 20)
units
Micropower Undervoltage Sensing Circuit 1 - Yes 2.8V 2.55V Surface Mount SOIC 8 5 x 4 x 1.5mm 3V 10 V - +70 °C
RS Stock No. 177-7094
Mfr. Part No.SP706EN-L/TR
BrandEXAR
PHP35.644
Each (On a Reel of 2500)
units
Low Power Microprocessor 1 Yes Yes 4.5V 4.25V Surface Mount SOIC 8 4.9 x 3.9 x 1.65mm - 5.5 V - +85 °C
RS Stock No. 688-8812
Mfr. Part No.MC33064D-5R2G
PHP31.215
Each (In a Pack of 2)
units
Undervoltage Detector 1 - - 4.7V 4.5V Surface Mount SOIC 8 5 x 4 x 1.5mm - 6.5 V - +85 °C
RS Stock No. 103-5061
Mfr. Part No.MC33161DG
PHP49.429
Each (In a Tube of 98)
units
Voltage Monitor 1 - - 1.295V 1.245V Surface Mount SOIC 8 5 x 4 x 1.5mm - 40 V - +105 °C
RS Stock No. 806-2040
Mfr. Part No.MC33164D-3G
PHP30.92
Each (In a Pack of 25)
units
Micropower Undervoltage Sensing Circuit 1 - - 2.8V 2.55V Surface Mount SOIC 8 5 x 4 x 1.5mm 3V 10 V - +125 °C
RS Stock No. 121-7903
Mfr. Part No.MC33064DM-5R2G
PHP13.76
Each (On a Reel of 4000)
units
Undervoltage Detector 1 - - 4.7V 4.5V Surface Mount MSOP 8 3.1 x 3.1 x 0.95mm 5V 10 V - +85 °C
RS Stock No. 145-2807
Mfr. Part No.MC33064D-5G
PHP30.92
Each (In a Tube of 98)
units
Undervoltage Detector 1 N N 4.7V 4.5V Surface Mount SOIC 8 5 x 4 x 1.5mm - 6.5 V - +85 °C
RS Stock No. 822-6815
Mfr. Part No.LTC4365CTS8#TRMPBF
PHP182.115
Each (In a Pack of 2)
units
Overvoltage Protection 1 - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm - 34 V - +70 °C
RS Stock No. 791-6252
Mfr. Part No.NCP303LSN45T1G
PHP18.27
Each (On a Tape of 25)
units
Voltage Detector 1 - - 4.59V 4.41V Surface Mount TSOP 5 3 x 1.5 x 1mm - 10 V - +125 °C
RS Stock No. 686-5803
Mfr. Part No.SP706EN-L/TR
BrandMaxLinear
PHP43.58
Each (In a Pack of 5)
units
Low Power Microprocessor 1 Yes Yes 4.5V 4.25V Surface Mount SOIC 8 4.9 x 3.9 x 1.65mm - 5.5 V - +85 °C
RS Stock No. 858-0901
Mfr. Part No.LTC4365HTS8#TRMPBF
PHP219.675
Each (In a Pack of 2)
units
Overvoltage Protection, Reverse Supply Protection, Undervoltage Protection - - - - - Surface Mount TSOT-23 8 2.9 x 1.75 x 0.9mm - 34 V - +125 °C
RS Stock No. 645-1527
Mfr. Part No.M51953BL
PHP31.128
Each (In a Pack of 5)
units
Voltage Detector 1 - - 4.45V 4.05V Through Hole SIP 5 11.7 x 1.97 x 4mm 4.45V 17 V - +85 °C
RS Stock No. 731-4797
Mfr. Part No.BD5227FVE-TR
BrandROHM
PHP24.15
Each (In a Pack of 10)
units
CMOS Voltage Detector 1 - - 2.727V 2.673V Surface Mount VSOF 5 1.6 x 1.2 x 0.6mm - 6.5 V - +105 °C
RS Stock No. 162-9041
Mfr. Part No.NCP303LSN36T1G
PHP8.19
Each (On a Reel of 3000)
units
Undervoltage Detector 1 N N 3.672V 3.528V Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V 10 V - +125 °C
RS Stock No. 810-0029
Mfr. Part No.ADM6711RAKSZ-REEL7
PHP39.53
Each (On a Tape of 10)
units
Microprocessor Supervisory Circuit 1 - Yes 2.63V 2.55V Surface Mount SC-70 4 2.2 x 1.35 x 1mm 5.5V 5.5 V - +125 °C
RS Stock No. 162-9052
Mfr. Part No.NCP305LSQ45T1G
PHP9.14
Each (On a Reel of 3000)
units
Ultra Low Supply Current 1 - - 4.59V 4.41V Surface Mount SC-82AB 4 2.2 x 1.35 x 1mm 4.9V 10 V - +125 °C
RS Stock No. 877-2918
Mfr. Part No.STM6503SEAADG6F
PHP38.59
Each (In a Pack of 10)
units
Voltage Monitor 1 - - 2.998V 2.85V Surface Mount TDFN 8 2.1 x 2.1 x 0.75mm 4.63V 5.5 V - +85 °C
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