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. 145-0783
Mfr. Part No.TLV803SDBZT
TWD12.90
Each (On a Reel of 250)
units
Open Drain Voltage Detector 1 - - 2.99V - 2.87V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 2.5 V, 3 V, 3.3 V, 5V
RS Stock No. 812-4198
Mfr. Part No.TLV803SDBZT
TWD20.90
Each (On a Tape of 25)
units
Open Drain Voltage Detector 1 - - 2.99V - 2.87V - - Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 2.5 V, 3 V, 3.3 V, 5V
RS Stock No. 162-7164
Mfr. Part No.TPS3808G30DBVT
TWD35.00
Each (On a Reel of 250)
units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 2.83V
RS Stock No. 662-3375
Mfr. Part No.TPS3808G30DBVT
TWD58.00
Each (In a Pack of 5)
units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 2.83V
RS Stock No. 791-6252
Mfr. Part No.NCP303LSN45T1G
TWD15.50
Each (On a Tape of 25)
units
Voltage Detector 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 923-5775
Mfr. Part No.DS1233AZ-10+
TWD72.90
Each (In a Tube of 75)
units
Microprocessor Power Supply Supervisor 1 - Yes - Yes - Active Low, Open Drain 450ms Surface Mount SOT-223 3 + Tab 6.5 x 3.5 x 1.8mm 2.97V
RS Stock No. 162-9516
Mfr. Part No.NCP303LSN45T1G
TWD5.40
Each (On a Reel of 3000)
units
Voltage Detector 1 - - 4.59V - 4.41V - - Surface Mount TSOP 5 3 x 1.5 x 1mm -
RS Stock No. 732-7286
Mfr. Part No.DS1233AZ-10+
TWD86.00
Each
units
Microprocessor Power Supply Supervisor 1 - Yes - Yes - Active Low, Open Drain 450ms Surface Mount SOT-223 3 + Tab 6.5 x 3.5 x 1.8mm 2.97V
RS Stock No. 189-1932
Mfr. Part No.STM1818SWX7F
TWD21.60
Each (In a Pack of 25)
units
- 1 - Yes - - - Active Low, Open Drain 200ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 3 V, 3.3V
RS Stock No. 789-3929
Mfr. Part No.CAT811TTBI-GT3
TWD13.30
Each (In a Pack of 20)
units
Microprocessor Power Supply Supervisor 1 - Yes 3.15V - 3V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 124-9970
Mfr. Part No.CAT811TTBI-GT3
TWD5.60
Each (On a Reel of 3000)
units
Microprocessor Power Supply Supervisor 1 - Yes 3.15V - 3V - - Surface Mount SOT-143 4 3.04 x 1.4 x 1.07mm 5V
RS Stock No. 412-412
Mfr. Part No.ADM690AARNZ
TWD170.00
Each
units
- 1 Yes - - Yes - Active Low, Push-Pull 280ms Surface Mount SOIC 8 5 x 4 x 1.5mm 4.75V
RS Stock No. 189-1871
Mfr. Part No.STM1818SWX7F
TWD8.30
Each (On a Reel of 3000)
units
- 1 - Yes - - - Active Low, Open Drain 200ms Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 3 V, 3.3V
RS Stock No. 121-8484
Mfr. Part No.TL7705ACP
TWD23.70
Each (In a Tube of 50)
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V
RS Stock No. 159-5032
Mfr. Part No.TL7705ACP
TWD28.00
Each
units
Supply 1 - - 4.6V - 4.5V - - Through Hole PDIP 8 9.81 x 6.35 x 4.57mm 10V
RS Stock No. 165-3308
Mfr. Part No.MCP130T-300I/TT
BrandMicrochip
TWD12.20
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 3V
RS Stock No. 738-6465
Mfr. Part No.MCP130T-300I/TT
BrandMicrochip
TWD15.90
Each (In a Pack of 10)
units
- 1 - - - - - Active Low, Open Drain 700ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.95mm 3V
RS Stock No. 169-7376
Mfr. Part No.APX803-26SAG-7
TWD3.30
Each (On a Reel of 3000)
units
Microprocessor Reset Monitor 1 - - - - - Active Low 280ms Surface Mount SOT-23 3 3 x 1.4 x 1mm 2.66V
RS Stock No. 662-3359
Mfr. Part No.TPS3808G09DBVT
TWD58.00
Each (In a Pack of 5)
units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 0.85V
RS Stock No. 162-7165
Mfr. Part No.TPS3808G09DBVT
TWD31.80
Each (On a Reel of 250)
units
- 1 - Yes - - - Open Drain - Surface Mount SOT-23 6 2.9 x 1.6 x 1.15mm 0.85V