About Supervisory Circuits

Supervisory Circuits

Supervisory circuits are electronic circuits used to monitor and control the operation of other circuits or systems. They are commonly found in appliances, industrial equipment and other electronic systems where reliable operation is required. Supervisory circuits monitor and control the behavior of other circuits and systems, providing feedback and making adjustments as necessary to keep them within acceptable parameters. They are generally composed of several parts, including sensors, comparators, alarms, timers, and relays. The sensors monitor the voltage, current, and temperature of the circuits and systems, while the comparators compare these values to normal operating parameters. Alarms are triggered when parameters are out of range, while the relays are used to activate corrective actions, such as turning off equipment or engaging a fail-safe mode. Timers are typically used to monitor the length of time a certain condition has been present, allowing the supervisor circuit to shut down the system before it is damaged by an enduring failure.

Supervisory Circuits

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	Type
	Mounting Style
	Output Voltage
	Package / Case
	Threshold Voltage
	Number of Inputs Monitored
	Output Type
	Manual Reset
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Image	Stock Code(▲▼)	Description	Manufacturer	Global Stock ⓘ (▲▼)	Price(USD) (Ex. GST)(▲▼)	Enter Qty	Type	Mounting Style	Output Voltage	Package / Case	Threshold Voltage	Number of Inputs Monitored	Output Type	Manual Reset	Watchdog	Watchdog Timers	Battery Backup Switching	Reset Delay Time	Supply Voltage - Max	Minimum Operating Temperature	Maximum Operating Temperature	Accuracy	Series	Qualification	Packaging

MCP100T-270I/TT

Supervisor Integrated Circuit; power on reset monitor (PoR)

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Microchip

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.236

Multiples of: 3000

R3111Q301C-TR-FE

Supervisory Circuits Low Voltage Detector

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2387

Multiples of: 1

Smd/Smt

SC - 82AB - 4

3 V

1 Input

Active Low, Cmos

No Manual Reset

no watchdog

No Backup

+ 85 C

R3111q

Cut Tape

MCP111T-475E/LB

Microchip Technology Supervisory Circuits Open Drain

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Microchip

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2412

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SC - 70 - 3

4.63 V

1 Input

No Manual Reset

no watchdog

5.5 V

- 40 C

+ 125 C

Mcp111

Reel

BD5243FVE-TR

ROHM Semiconductor Supervisory Circuits CMOS DETEC VOLT 4.3V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ROHM

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2412

Multiples of: 1

Voltage Monitors

Smd/Smt

VSOF - 5

4.3 V

1 Input

Open Drain

No Manual Reset

no watchdog

No Backup

10 V

- 40 C

+ 105 C

1 %

Bd52

Reel

TCM810TENB713

Microchip Technology Supervisory Circuits Microprocessor 38V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Microchip

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.25

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23B - 3

2.5 v , 3 v , 3.3 v , 5 v

1 Input

Active High, Push - Pull

No Manual Reset

No Watchdog

No Backup

560 ms

5.5 V

- 40 C

+ 85 C

Reel

Hot

TCM809LENB713

Supervisory Circuits Microprocessor 4.63V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Microchip

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.25

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23B - 3

2.5 v , 3 v , 3.3 v , 5 v

1 Input

Active Low, Push - Pull

No Manual Reset

no watchdog

No Backup

560 ms

5.5 V

- 40 C

+ 85 C

Tcm809

Cut Tape

MAX810SQ293D2T1G

Supervisory Circuits ANA 2.93V MC RESET

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ON Semiconductor

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2512

Multiples of: 1

Voltage Supervisory

Smd/Smt

SC - 70 - 3

1.2 v to 4.9 V

1 Input

Push - Pull

No Manual Reset

No Watchdog

no watchdog

No Backup

66 ms

5.5 V

- 40 C

+ 105 C

Max810

Reel

R3112Q421A-TR-FE

Supervisory Circuits Low Voltage Detector w/output delay

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.252

Multiples of: 1

Voltage Detectors

Smd/Smt

SC - 82AB - 4

4.2 V

1 Input

Cmos, Open Drain

No Manual Reset

no watchdog

Backup

6 V

- 40 C

+ 85 C

2 %

R3112q

Cut Tape

STM810MWX6F

Supervisor Push-Pull, Totem Pole 1 Channel SOT-23-3

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

STMicroelectronics

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2459

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

3 V , 3.3 V , 5 V

1 Input

Active High, Push - Pull

No Manual Reset

No Watchdog

no watchdog

No Backup

280 ms

5.5 V

- 40 C

+ 85 C

Stm810

Reel

R3111N351C-TR-FE

Supervisory Circuits Low Voltage Detector

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2652

Multiples of: 1

Voltage Supervisory

Smd/Smt

SOT - 23 - 5

3.5 V

1 Input

Cmos

No Manual Reset

no watchdog

Backup

10 V

- 40 C

+ 85 C

2 %

R3111n

Cut Tape

BU45K254G-TL

Supervisory Circuits Volt Det IC 2.5V Open Drain

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ROHM

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2675

Multiples of: 1

Voltage Detectors

Smd/Smt

SSOP - 3

2.5 V

1 Input

Open Drain

No Manual Reset

no watchdog

No Backup

400 ms

6 V

- 40 C

+ 105 C

1 %

Bu45/Bu46

Cut Tape

R3111N391A-TR-FE

Supervisory Circuits Low Voltage Detector

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2714

Multiples of: 1

Voltage Supervisory

Smd/Smt

SOT - 23 - 5

3.9 V

1 Input

Cmos, Open Drain

No Manual Reset

no watchdog

Backup

10 V

- 40 C

+ 85 C

2 %

R3111n

Reel

R3112N371A-TR-FE

Supervisory Circuits Low Voltage Detector with output delay (output capacitor type)

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2714

Multiples of: 1

Voltage Detectors

Smd/Smt

SOT - 23 - 5

3.7 V

1 Input

Cmos, Open Drain

No Manual Reset

no watchdog

Backup

100 ms

6 V

- 40 C

+ 85 C

2 %

R3112n

Reel

R3112N181A-TR-FE

Supervisory Circuits Low Voltage Detector w/output delay

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2714

Multiples of: 1

Voltage Detectors

Smd/Smt

SOT - 23 - 5

1.8 V

1 Input

Cmos, Open Drain

No Manual Reset

no watchdog

Backup

6 V

- 40 C

+ 85 C

2 %

R3112n

Cut Tape

STM810SWX6F

Supervisor Push-Pull, Totem Pole 1 Channel SOT-23-3

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

STMicroelectronics

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2721

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

3 V , 3.3 V , 5 V

1 Input

Active High, Push - Pull

No Manual Reset

No Watchdog

no watchdog

No Backup

280 ms

5.5 V

- 40 C

+ 85 C

Stm810

Reel

BU4921FVE-TR

ROHM Semiconductor Supervisory Circuits 2.1V, CMOS Standard Low Voltage Detector

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ROHM

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2756

Multiples of: 1

Voltage Monitors

Smd/Smt

VSOF - 5

2.1 V

1 Input

Cmos

No Manual Reset

no watchdog

No Backup

7 V

- 40 C

+ 125 C

1 %

Bu4921fve

Reel

BD4734G-TR

ROHM Semiconductor Supervisory Circuits RESET DETEC VOLT 3.4V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ROHM

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2758

Multiples of: 3000

Voltage Monitors

Smd/Smt

SOT - 23 - 5

3.4 V

1 Input

Open Collectors

No Manual Reset

no watchdog

No Backup

- 40 C

+ 75 C

1 %

Bd47

Reel

BD4735G-TR

Supervisory Circuits RESET DETEC VOLT 3.5V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

ROHM

Availability : 2910
Ship by Fri. 14 Nov to Thu. 20 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2758

Multiples of: 3000

Voltage Monitors

Smd/Smt

SOT - 23 - 5

3.5 V

1 Input

Open Collectors

No Manual Reset

no watchdog

No Backup

- 40 C

+ 75 C

1 %

Bd47

Reel

R3111N301A-TR-FE

Supervisory Circuits Low Voltage Detector

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Nisshinbo

Availability : 2910
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025

November 2025
	S	M	T	W	T	F	S
44	26	27	28	29	30	31	1
45	2	3	4	5	6	7	8
46	9	10	11	12	13	14	15
47	16	17	18	19	20	21	22
48	23	24	25	26	27	28	29
49	30	1	2	3	4	5	6

USD 0.2764

Multiples of: 1

Smd/Smt

SOT - 23 - 5

3 V

1 Input

Active Low, Open Drain

No Manual Reset

no watchdog

No Backup

+ 85 C

R3111n

Cut Tape

TCM809LVNB713

Supervisory Circuits Microprocessor 4.63V

This product is classified as Large/Heavy, additional shipping charges may apply. A customer service representative may contact you after ordering to confirm exact shipping charges.

Microchip

Availability : 1471
Ship by Wed. 12 Nov to Fri. 14 Nov

November 2025