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. 850-7912
Mfr. Part No.ADM6316CY29ARJZ-R7
£0.56
Each (In a Pack of 5)
Units
- 1 Yes Yes - - - Active Low, Open Drain 280ms Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 3V
RS Stock No. 160-9932
Mfr. Part No.ADM6316CY29ARJZ-R7
£0.557
Each (On a Reel of 3000)
Units
- 1 Yes Yes - - - Active Low, Open Drain 280ms Surface Mount SOT-23 5 3 x 1.7 x 1.3mm 3V
RS Stock No. 462-6511
Mfr. Part No.TPS3820-33DBVT
£1.04
Each (In a Pack of 5)
Units
- 1 Yes Yes - - - Active Low - Surface Mount SOT-23 5 2.9 x 1.6 x 1.15mm 3V
RS Stock No. 732-7270
Mfr. Part No.DS1232LPS-2+
£2.87
Each
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. 767-3507
Mfr. Part No.MCP130T-485I/TT
BrandMicrochip
£0.343
Each (In a Pack of 10)
Units
- 1 - - - Yes - Open Drain 10µs Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 4.85V
RS Stock No. 121-8580
Mfr. Part No.TPS3820-33DBVT
£0.596
Each (On a Reel of 250)
Units
- - - - - - - - - - - - - -
RS Stock No. 165-3520
Mfr. Part No.MCP130T-485I/TT
BrandMicrochip
£0.259
Each (On a Reel of 3000)
Units
- 1 - - - Yes - Open Drain 10µs Surface Mount SOT-23 3 3.04 x 1.4 x 1.02mm 4.85V
RS Stock No. 165-4594
Mfr. Part No.MCP130-475DI/TO
BrandMicrochip
£0.275
Each (In a Bag of 1000)
Units
- 1 - - - - - Active Low, Open Drain 700ms Through Hole TO-92 3 4.71 x 3.62 x 4.62mm 4.75V
RS Stock No. 163-2440
Mfr. Part No.MAX809LTRG
£0.137
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Push-Pull 460ms Surface Mount SOT-23 3 2.9 x 1.3 x 0.94mm 4.75V
RS Stock No. 145-0783
Mfr. Part No.TLV803SDBZT
£0.244
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. 136-0681
Mfr. Part No.DS1232LPS-2+
£1.813
Each (In a Tube of 100)
Units
Microprocessor Power Supply Supervisor - - - - - - - - - - - - -
RS Stock No. 688-8796
Mfr. Part No.MAX809LTRG
£0.44
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 4.75V
RS Stock No. 812-4198
Mfr. Part No.TLV803SDBZT
£0.434
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. 920-9017
Mfr. Part No.STM811LW16F
£0.168
Each (On a Reel of 3000)
Units
- 1 - Yes - - - Active Low, Push-Pull 280ms Surface Mount SOT-143 4 3.04 x 1.4 x 1.02mm 4.75V
RS Stock No. 170-4440
Mfr. Part No.SP705EN-L
BrandMaxLinear
£0.499
Each (In a Tube of 98)
Units
Low Power Microprocessor 1 Yes Yes 4.75V - 4.5V - - Surface Mount SOIC 8 4.9 x 3.9 x 1.65mm -
RS Stock No. 379-2213
Mfr. Part No.MCP130-475DI/TO
BrandMicrochip
£0.384
Each (In a Pack of 5)
Units
- 1 - - - - - Active Low, Open Drain 700ms Through Hole TO-92 3 4.71 x 3.62 x 4.62mm 4.75V
RS Stock No. 738-6499
Mfr. Part No.MCP131T-300E/TT
BrandMicrochip
£0.424
Each (On a Tape of 10)
Units
- 1 - - - - - Active Low, Open Drain 0.13ms Surface Mount SOT-23B 3 3.04 x 1.4 x 1.02mm 3V
RS Stock No. 889-5581
Mfr. Part No.MCP120T-300I/TT
BrandMicrochip
£0.259
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. 667-4199
Mfr. Part No.MCP120T-300I/TT
BrandMicrochip
£0.36
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. 165-3309
Mfr. Part No.MCP131T-300E/TT
BrandMicrochip
£0.305
Each (On a Reel of 3000)
Units
- 1 - - - - - Active Low, Open Drain 0.13ms Surface Mount SOT-23B 3 3.04 x 1.4 x 1.02mm 3V