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. 802-4130
Mfr. Part No.NCP301HSN22T1G
£0.362
Each (In a Pack of 25)
Units
Ultra Low Supply Current 1 No - 2.244V - 2.156V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 802-1632
Mfr. Part No.NCP361SNT1G
£0.446
Each (In a Pack of 25)
Units
Overvoltage Protection 1 - - 3.15 V, 5.9V - 2.85V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 170-8183
Mfr. Part No.ICL7673CPAZ
£0.209
Each (In a Tube of 50)
Units
- - - - - - - - - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm -
RS Stock No. 802-4013
Mfr. Part No.NCP303LSN27T1G
£0.109
Each (On a Tape of 25)
Units
Undervoltage Detector 1 - - 2.754V - 2.646V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 921-5466
Mfr. Part No.ICL7673CPAZ
£0.262
Each (In a Pack of 5)
Units
- - - - - - - - - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm -
RS Stock No. 165-3366
Mfr. Part No.MCP1320T-29LE/OT
BrandMicrochip
£0.408
Each (On a Reel of 3000)
Units
- 1 Yes Yes - - - Active Low, Open Drain 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.97V
RS Stock No. 912-9595
Mfr. Part No.ADM1085AKSZ-REEL7
£0.386
Each (On a Reel of 3000)
Units
Simple Sequencer 1 - - 0.64V - 0.56V - - Surface Mount SC-70 6 2.2 x 1.35 x 1mm 22V
RS Stock No. 170-8221
Mfr. Part No.X5043S8Z
£2.269
Each (In a Tube of 100)
Units
- 1 Yes - - - - Active Low 400ms Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 4.5V
RS Stock No. 738-6323
Mfr. Part No.MCP1320T-29LE/OT
BrandMicrochip
£0.512
Each (In a Pack of 5)
Units
- 1 Yes Yes - - - Active Low, Open Drain 2240ms Surface Mount SOT-23 5 3.1 x 1.8 x 1.3mm 2.97V
RS Stock No. 178-5287
Mfr. Part No.MCP100T-315I/TT
BrandMicrochip
£0.213
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 3.15V
RS Stock No. 162-9010
Mfr. Part No.NCP301HSN22T1G
£0.144
Each (On a Reel of 3000)
Units
Ultra Low Supply Current 1 No - 2.244V - 2.156V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 742-7705
Mfr. Part No.ADM1085AKSZ-REEL7
£0.828
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. 667-4133
Mfr. Part No.MCP100T-315I/TT
BrandMicrochip
£0.295
Each (In a Pack of 20)
Units
- 1 - - - - - Active Low, Push-Pull - Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 3.15V
RS Stock No. 496-820
Mfr. Part No.ICL7673CPAZ
£0.734
Each (In a Pack of 5)
Units
- - - - - - - - - Through Hole PDIP 8 10.16 x 7.11 x 4.95mm -
RS Stock No. 921-5822
Mfr. Part No.X5043S8Z
£2.905
Each (In a Pack of 2)
Units
- 1 Yes - - - - Active Low 400ms Surface Mount SOIC 8 4.9 x 3.9 x 1.45mm 4.5V
RS Stock No. 170-3553
Mfr. Part No.NCP303LSN27T1G
£0.107
Each (On a Reel of 3000)
Units
Undervoltage Detector 1 - - 2.754V - 2.646V - - Surface Mount TSOP 5 3 x 1.5 x 1mm 4.9V
RS Stock No. 923-5763
Mfr. Part No.DS1232LPS-2+
£1.823
Each (In a Tube of 400)
Units
Microprocessor Power Supply Supervisor 1 Yes Yes - Yes - Active High, Active Low, Open Drain 1000ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.74V
RS Stock No. 121-6506
Mfr. Part No.NCP300LSN20T1G
£0.159
Each (On a Reel of 3000)
Units
Voltage Detector 1 - - 2.06V - 1.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 806-5244
Mfr. Part No.NCP300LSN20T1G
£0.401
Each (In a Pack of 25)
Units
Voltage Detector 1 - - 2.06V - 1.94V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 686-1615
Mfr. Part No.STM811LW16F
£0.401
Each (In a Pack of 10)
Units
- 1 - Yes - - - Active Low, Push-Pull 280ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.02mm 4.75V