M41T81 semiconductor Series

The M41T81 series from STMicroelectronics is a line of I2C real-time clock (RTC) integrated circuits designed for embedded systems that require precise timekeeping and scheduling capabilities. These ICs come equipped with a calendar function, alarm triggers, and a watchdog timer, making them ideal for applications that need to manage timing and ensure system stability. If you're working on any project involving embedded systems, particularly those that require accurate time management, such as network equipment, industrial control systems, or automotive electronics, the M41T81 series could be a valuable addition. The calendar function allows for date and time tracking, while the alarm feature can be used for various timing events, from simple reminders to complex scheduling tasks. The watchdog timer is crucial for maintaining system integrity by resetting the microcontroller if it locks up or malfunctions. One thing worth noting is that these ICs operate over a wide temperature range, typically from -40°C to +85°C, which makes them suitable for harsh environments. Engineers tend to reach for this when they need a reliable RTC solution that can handle diverse operational conditions

Mfr Part #	Quantity Available	Price	Category	RoHS	Interface	Voltage - Supply	Packaging	Package / Case	Time Format	Operating Temperature	Mounting Type	Date Format	Standard Package	Memory	RAM Size	Voltage Rating	Voltage - Supply (Min)	Voltage - Supply, Battery	Number of Positions	Supplier Device Package	Type	Features	Bus Connection	Factory Pack Quantity	Standard Package Name	EU RoHS	Common Mode Transient Immunity (Min)	Width	Mounting Style	Package Quantity	Function	Other Names	Product Category	SVHC	Tariff No	Weight	Lead Style	Number of Pins	Material Finish	Length - Overall	Shell Size - Insert	Printed Circuit Board	Package Cooled	Termination	Mechanical Life	Height	Length	Size / Dimension	Programmable Features	MOQ	Unit Pack	Automotive	Leadfree Defin	Data Rate	Crystal AR	Power - Max	Voltage - Input (Min)	Matchcode	Standard Leadtime	Number of Outputs	Base Unit	Rad Hardened	DELETED	Operating Temperature - Junction	Spg	Number of Units	Product	Series	Manufacturer	Battery Series	Clock Frequency	Part Status	Reset Time	Memory Type	Connector Usage	Main Purpose	Display Units
7 M41T81M6F stmicroelectronics	2500	2500: $11.4634	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	2.5\|3.3\|5 V	Tape and Reel	8SO N	HH:MM:SS:hh	-40 to 85 °C	Surface Mount	DW:DM:M:Y	Cut Tape	20 B	20 byte	2	5.5	2.5 V ~ 3.5 V	8	8-SO	RTC	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	2500	SOIC	Compliant	Industrial	4(Max)	SMD/SMT	SO N	Clock/Calendar/Alarm/Timer/Interrupt	497-4709-2	Real Time Clock	:No SVHC (20-Jun-2013)	85423300	0.003	Gull-wing	:8	:MSL 1 - Unlimited	5(Max)	1.65(Max)	8	-	-40°C	-	-	-	-	-	2500	2500	NO	RoHS-conform	I2C	NO	85°C	2.0V	M41T81M6F	15 weeks	-	-	-	-	-	2500	1	-	-	-	-	-	-	-	-	-	-	-
2 M41T81MX6 STMicroelectronics	12	1: $153.00	-	RoHS Compliant	Serial	5.5 V	Tube	SO-28	HH:MM:SS:hh	+ 85 C	Surface Mount	YY-MM-DD-dd	28	20 B	-	-	-	2.5 V ~ 3.5 V	-	8-SO	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	-	28	-	-	-	-	SMD/SMT	-	Clock, Calendar, Alarm, Timer Interrupt	497-2822-5	-	-	-	-	-	-	-	-	-	-	-	-	Obsolete	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
M41T81MX6TR STMicroelectronics	0		-	No	Serial	5.5 V	Reel	SO-28	HH:MM:SS:hh	+ 85 C	-	-	-	20 B	-	-	-	-	-	-	-	-	-	1000	-	-	-	-	SMD/SMT	-	Clock, Calendar, Alarm, Timer Interrupt	-	Real Time Clock	-	-	-	-	-	-	-	-	-	-	-	Obsolete	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
2 M41T81M6 STMicroelectronics	80	4: $59.84	-	No	Serial	5.5 V	Tube	SO-8	HH:MM:SS:hh	+ 85 C	Surface Mount	DW:DM:M:Y	-	20 B	20B	2 V	5.5 V	-	8	-	-	-	Serial-I2C	100	-	-	-	3.9mm	SMD/SMT	-	Clock, Calendar, Alarm, Timer Interrupt	-	-	-	-	-	-	-	-	-	-	-	SOIC	-	Obsolete	1.25mm	4.9mm	4.9 x 3.9 x 1.25mm	Alarm, Battery Backup, Calendar, Chip Deselect, Clock, Switch Over, Watchdog Timer	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
2 M41T81SMY6F stmicroelectronics	128	1: $79.56	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	3.3\|5 V	Tape and Reel	18SOX	HH:MM:SS:hh	-40 to 85 °C	Surface Mount	DW:DM:M:Y	Tape & Reel	20 B	20 byte	2.7	5.5	2 V ~ 3.5 V	18	18-SOX	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	1000	SOX	Compliant	Industrial	-	SMD/SMT	SOX	Clock/Calendar/Alarm/Timer/Interrupt	497-6157-2	Real Time Clock	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	Real Time Clocks	M41T81S	STMicroelectronics	Backup Switching	-	-	-	-	-	-	-
3 M41T81SM6E STMicroelectronics	10	1: $720.80	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	2.7 V ~ 5.5 V	Tube	8-SOIC (0.154", 3.90mm Width)	HH:MM:SS:hh	-40°C ~ 85°C	Surface Mount	DW:DM:M:Y	100	-	20	2.7	5.5	2 V ~ 3.5 V	8	8-SO	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	-	SOIC	Compliant	Industrial	4(Max)	-	SO N	-	-	-	:No SVHC (20-Jun-2013)	85423245	0.002	Gull-wing	:8	:-	5(Max)	1.65(Max)	8	-	:SMD	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	:1	:41	-	-	-	-	-	-	-	-	-	:32kHz	-	-	-	-	-	-
4 M41T81M6E STMicroelectronics	10	2: $11.288	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	2 V ~ 5.5 V	Tube	8-SOIC (0.154", 3.90mm Width)	HH:MM:SS:hh	-40°C ~ 85°C	Surface Mount	DW:DM:M:Y	100	:20 x 8	20B	2 V	5.5 V	2.5 V ~ 3.5 V	8	8-SO	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	-	SOIC	Compliant	Industrial	3.9mm	-	SO N	-	-	-	:No SVHC (20-Jun-2013)	85423190	0.000001	Gull-wing	:8	:-	5(Max)	1.65(Max)	8	SOIC	-	-	1.25mm	4.9mm	4.9 x 3.9 x 1.25mm	Alarm, Battery Backup, Calendar, Chip Deselect, Clock, Switch Over, Watchdog Timer	-	-	-	-	-	-	-	-	-	-	:1	:41	No	Compliant	85C	-	-	-	-	-	-	-	:41T81	:10Yr	:NVRAM	-	-	-
5 M41T81SM6F stmicroelectronics	2400	1: $19.924	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	3.3\|5 V	Tape and Reel	8SO N	HH:MM:SS:hh	-40 to 85 °C	Surface Mount	DW:DM:M:Y	Tape & Reel	20 B	20 byte	2.7	2.7 V	2 V ~ 3.5 V	8	8-SO	RTC	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	2500	SOIC	Compliant	Industrial	4(Max)	SMD/SMT	SO N	Clock/Calendar/Alarm/Timer/Interrupt	497-4684-2	Real Time Clock	:No SVHC (20-Jun-2013)	85423300	0.003	Gull-wing	:8	:MSL 1 - Unlimited	5(Max)	1.65(Max)	8	SO N	-40°C	-	-	-	-	-	2500	2500	NO	RoHS-conform	I2C	NO	85°C	2.7V	M41T81SM6F	15 weeks	-	-	No	Compliant	85C	-	-	-	-	-	-	-	-	-	-	-	-	-
3 M41T81SMY6E STMicroelectronics	10	1100: $17.7745	-	Lead free / RoHS Compliant	I²C, 2-Wire Serial	2.7 V ~ 5.5 V	Tube	18-SOX, 18-SOIC with Crystal (7.5mm Width)	HH:MM:SS:hh	-40°C ~ 85°C	Surface Mount	DW:DM:M:Y	44	-	20B	2.7 V	5.5 V	2 V ~ 3.5 V	18	18-SOX	Clock/Calendar	Alarm, Leap Year, Square Wave Output, Watchdog Timer	Serial (I2C)	-	SOX	Compliant	Industrial	7.62mm	-	SOX	-	-	-	-	-	-	-	-	-	-	-	-	SOX	-	-	2.34mm	11.61mm	11.61 x 7.62 x 2.34mm	Alarm, Battery Backup, Calendar, Chip Deselect, Clock, Switch Over, Watchdog Timer	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	I²C, 2-Wire Serial	Alarm, Leap Year, Square Wave Output, Watchdog Timer	YY-MM-DD-dd
M41T81SMY6E (EOL) STM	0		-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
M41T81M6E (EOL) STM	0		-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-

cigen-M41T81

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Frequently Asked Questions

M41T81 semiconductor - Part List

Package / Case

Standard Package

Voltage - Supply

Other Names

Factory Pack Quantity

Voltage Rating

RoHS

Tariff No

RAM Size

Voltage - Supply (Min)

Width

Weight

Packaging

Operating Temperature

Package Cooled

Standard Package Name

Memory

Interface

Voltage - Input (Min)

Voltage - Supply, Battery

Termination

Material Finish

Package Quantity

Number of Positions

Supplier Device Package

Type

Function

Matchcode

Date Format

Bus Connection

Height

Length

Size / Dimension