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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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

BD4933G-TR

Supervisory Circuits CMOS DETEC VOLT 3.3V

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 : 14809
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.1485

Multiples of: 1

Voltage Monitors

Smd/Smt

SSOP - 5

3.3 V

1 Input

Cmos

No Manual Reset

No Watchdog

no watchdog

No Backup

10 V

- 40 C

+ 105 C

1 %

Bd49

Reel

NCP300HSN47T1G

Supervisory Circuits 4.7V Detector w/Reset High

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 : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2336

Multiples of: 1

Voltage Monitors

Smd/Smt

SOT - 23 - 5 TH in (TSOP - 5)

4.7 V

1 Input

Active High, Cmos

No Manual Reset

No Watchdog

no watchdog

Backup

10 V

- 40 C

+ 125 C

2 %

Ncp300

Reel

NCP304LSQ40T1G

Supervisory Circuits 4.0V Detector w/Reset Low

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 : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2336

Multiples of: 1

Voltage Monitors

Smd/Smt

4 V

1 Input

Active Low, Cmos

No Manual Reset

no watchdog

Backup

- 40 C

+ 85 C

2 %

Ncp304

Reel

STM1001RWX6F

Supervisory Circuits RESET CIRCUIT

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 : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2276

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

3 V , 3.3 V , 5 V

1 Input

Open Collector / Drain

Manual Reset

No Watchdog

No Backup

280 ms

7 V

- 40 C

+ 85 C

Stm1001

Reel

STM1818TWX7F

Supervisory Circuits 3.06VRST Active Low Open Drain 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.

STMicroelectronics

Availability : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.4146

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

3 v , 3.3 v , 5 V

1 Input

Active Low, Open Drain

Manual Reset

No Watchdog

No Backup

5.5 V

- 40 C

+ 105 C

Stm1818

Reel

STM1818SWX7F

Supervisory Circuits 2.88VRST Active Low Open Drain 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.

STMicroelectronics

Availability : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.4146

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

3 v , 3.3 v , 5 V

3 Input

Active Low, Open Drain

Manual Reset

No Watchdog

no watchdog

No Backup

2 us

5.5 V

- 40 C

+ 105 C

Stm1818

Reel

NCP348MTTBG

Supervisory Circuits OVER VLTG PROTECTION

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 : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.4888

Multiples of: 1

Voltage Supervisory

Smd/Smt

WDFN - 10

1 Input

No Manual Reset

no watchdog

28 V

- 40 C

+ 85 C

Ncp348

Reel

STM6315RBW13F

Supervisory Circuits Open Drain Microprocessor 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.

STMicroelectronics

Availability : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.5298

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 143 - 4

1 v to 5.5 V

1 Input

Active Low, Open Drain

Manual Reset

No Watchdog

no watchdog

No Backup

30 ms

5.5 V

- 40 C

+ 125 C

1.8 %

Stm6315

Reel

STWD100YNWWY3F

Supervisory Circuits CONDITIONING & INTERFACES

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 : 14550
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.575

Multiples of: 3000

Voltage Supervisory

Smd/Smt

SOT - 23 - 5

1 Input

Open Drain

No Manual Reset

Watchdog

watchdog

No Backup

5.5 V

- 40 C

+ 125 C

Stwd100

Aec - Q100

Cut Tape

NCP300HSN09T1G

Supervisory Circuits 0.9V Detector w/Reset High

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 : 14540
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2336

Multiples of: 1

Voltage Monitors

Smd/Smt

SOT - 23 - 5 TH in (TSOP - 5)

0.9 V

1 Input

Active High, Cmos

No Manual Reset

No Watchdog

no watchdog

Backup

10 V

- 40 C

+ 85 C

2 %

Ncp300

Reel

NCP305LSQ35T1G

Supervisory Circuits 3.5V Detector w/Reset Low

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 : 14174
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2336

Multiples of: 1

Voltage Monitors

Smd/Smt

SC - 82AB - 4

3.5 V

1 Input

Active Low, Open Drain

No Manual Reset

No Watchdog

no watchdog

Backup

10 V

- 40 C

+ 85 C

2 %

Ncp305

Reel

TL7705AID

Supervisory Circuits 4.55V Monitor

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.

Texas Instruments

Availability : 13766
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 2.035

Multiples of: 1

Voltage Supervisory

Smd/Smt

SOIC - 8

4.55 V

1 Input

Active - High,Active - Low,Open - Drain

Manual Reset

no watchdog

No Backup

programmable

18 V

- 40 C

+ 85 C

Tl7705a

Tube

BU4235G-TR

Volt Supervisor Detect W/Delay Circuit 0.9V to 4.8V 5-Pin SSOP T/R

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 : 13678
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2036

Multiples of: 1

Voltage Monitors

Smd/Smt

SSOP - 5

3.5 V

Bu42

Cut Tape

APX809S-31SA-7

Supervisory Circuits Reset Generator

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.

Diodes Incorporated

Availability : 13646
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.0935

Multiples of: 1

Voltage Monitors

Smd/Smt

SOT - 23 - 3

3.08 V

1 Input

Active Low, Push - Pull

No Manual Reset

no watchdog

No Backup

240 ms

5.5 V

- 40 C

+ 125 C

Apx809s/810S

Cut Tape

MAX810S

Active High 1 SOT-23-3 Monitors & Reset Circuits ROHS

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.

MSKSEMI

Availability : 13613
Ship by Fri. 18 Jul to Wed. 23 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.0403

Multiples of: 10

2.93 V

Push Pull

NCP304LSQ42T1G

Supervisory Circuits 4.2V Detector w/Reset Low

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 : 13593
Ship by Fri. 04 Jul to Thu. 10 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2335

Multiples of: 1

Voltage Monitors

Smd/Smt

SC - 82AB - 4

4.2 V

1 Input

Active Low, Cmos

No Manual Reset

No Watchdog

no watchdog

Backup

10 V

- 40 C

+ 85 C

2 %

Ncp304

Reel

TPS3809K33DBVRG4

Supervisory Circuits 3-Pin Supply Voltage Supervisor

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.

Texas Instruments

Availability : 13558
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.4196

Multiples of: 1

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

2.93 V

1 Input

Active Low, Push - Pull

No Manual Reset

No Watchdog

no watchdog

No Backup

200 ms

6 V

- 40 C

+ 85 C

Tps3809k33

Reel

NCP803SN293T3G

ON Semiconductor Supervisory Circuits 2.93V 20mA 3-Pin wuP Reset N-Channel

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 : 13556
Ship by Wed. 02 Jul to Fri. 04 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.2017

Multiples of: 1

Voltage Supervisory

Smd/Smt

SOT - 23 - 3

1.2 v to 4.9 V

1 Input

Open Collector / Drain

No Manual Reset

no watchdog

No Backup

460 ms

5.5 V

- 40 C

+ 105 C

Ncp803

Reel

STWD100NYWY3F

Peripheral circuit; timer; open drain; Active logical level: low

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 : 10216
Ship by Fri. 18 Jul to Wed. 23 Jul

July 2025

July 2025
	S	M	T	W	T	F	S
27	29	30	1	2	3	4	5
28	6	7	8	9	10	11	12
29	13	14	15	16	17	18	19
30	20	21	22	23	24	25	26
31	27	28	29	30	31	1	2
32	3	4	5	6	7	8	9

USD 0.257

Multiples of: 1

LM3880MFX-1AF/NOPB

Supervisory Circuits 3 Rail Simple Power Sequencer with Fixed Time Delay 6-SOT-23 -40 to 125

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.

Texas Instruments

Availability : 0
Request Quote

USD 0.5137

Multiples of: 1

Voltage Sequencers

Smd/Smt

SOT - 23 - 6

5.5 V

- 40 C

+ 125 C

Lm3880

Reel