Real Time Clock – Mouser Peru

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Real Time Clocks for Thermostats

Real Time Clocks (RTCs) are IC devices that keep track of time. A typical RTC can provide the time of day as well as the date via a serial bus such as I2C or SPI

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	Interface Type	Date Format	Time Format	Package / Case	Battery Backup Switching	Supply Voltage - Min	Supply Voltage - Max	Minimum Operating Temperature	Maximum Operating Temperature	Series	Mounting Style	Packaging
Real Time Clock I C Serial Real-Time Clock DS1339U-3+ Analog Devices / Maxim Integrated 1: S/ 15.06 1,309In Stock	Mfr. Part # DS1339U-3+ Mouser Part # 700-DS1339U-3	Analog Devices / Maxim Integrated	Real Time Clock I C Serial Real-Time Clock Learn More about Analog Devices / Maxim Integrated maxim hvac solutions	Datasheet	1,309In Stock	S/ 15.06 S/ 14.75 S/ 14.40 S/ 14.13 View S/ 13.90 S/ 13.70 S/ 13.51	Min.: 1 Mult.: 1 Max.: 1,047	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	uSOP-8	Backup Switching	2.7 V	3.3 V	- 40 C	+ 85 C	DS1339U	SMD/SMT	Tube
Real Time Clock I2C GP RTCC 64B SRAM MCP7940N-I/MS Microchip Technology 1: S/ 3.50 2,005In Stock	Mfr. Part # MCP7940N-I/MS Mouser Part # 579-MCP7940N-I/MS	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	2,005In Stock	S/ 3.50 S/ 3.23 S/ 3.20	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	MSOP-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock I2C GP RTCC 64B SRAM MCP7940N-I/ST Microchip Technology 1: S/ 3.50 67In Stock 500Expected 10/27/2026	Mfr. Part # MCP7940N-I/ST Mouser Part # 579-MCP7940N-I/ST	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	67In Stock 500Expected 10/27/2026	S/ 3.50 S/ 3.23 S/ 3.11	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID MCP79410-I/MS Microchip Technology 1: S/ 4.20 247In Stock 1,400Expected 11/2/2026	Mfr. Part # MCP79410-I/MS Mouser Part # 579-MCP79410-I/MS	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	247In Stock 1,400Expected 11/2/2026	S/ 4.20 S/ 3.93 S/ 3.85	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	MSOP-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID MCP79410-I/ST Microchip Technology 1: S/ 4.20 767In Stock	Mfr. Part # MCP79410-I/ST Mouser Part # 579-MCP79410-I/ST	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	767In Stock	S/ 4.20 S/ 3.93 S/ 3.85	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock I C RTC with 56-Byte NV RAM DS1338U-33+ Analog Devices / Maxim Integrated 1: S/ 24.25 410In Stock	Mfr. Part # DS1338U-33+ Mouser Part # 700-DS1338U-33	Analog Devices / Maxim Integrated	Real Time Clock I C RTC with 56-Byte NV RAM	Datasheet	410In Stock	S/ 24.25 S/ 19.81 S/ 16.82 S/ 16.62 S/ 15.80	Min.: 1 Mult.: 1 Max.: 328	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	uSOP-8	Backup Switching	3 V	5.5 V	- 40 C	+ 85 C	DS1338U	SMD/SMT	Tube
Real Time Clock I C Serial Real-Time Clock DS1339U-33+ Analog Devices / Maxim Integrated 1: S/ 27.40 818In Stock	Mfr. Part # DS1339U-33+ Mouser Part # 700-DS1339U-33	Analog Devices / Maxim Integrated	Real Time Clock I C Serial Real-Time Clock Learn More about Analog Devices / Maxim Integrated maxim hvac solutions	Datasheet	818In Stock	S/ 27.40 S/ 21.02 S/ 17.83 S/ 17.63 View S/ 16.78 S/ 16.27	Min.: 1 Mult.: 1 Max.: 654	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	uSOP-8	Backup Switching	2.97 V	5.5 V	- 40 C	+ 85 C	DS1339U	SMD/SMT	Tube
Real Time Clock 128 NVRAM Serial RTC 3.0 to 3.6 Vcc M41ST87WSS6F STMicroelectronics 1: S/ 30.24 23In Stock 1,350On Order	Mfr. Part # M41ST87WSS6F Mouser Part # 511-M41ST87WSS6F	STMicroelectronics	Real Time Clock 128 NVRAM Serial RTC 3.0 to 3.6 Vcc	Datasheet	23In Stock 1,350On Order	Cut Tape S/ 30.24 S/ 23.36 S/ 21.60 S/ 19.73 Reel S/ 16.93 View S/ 18.53 S/ 18.49 S/ 16.08 MouseReel Available	Min.: 1 Mult.: 1 : 1,350	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SSOP-20	Backup Switching	2.7 V	3.6 V	- 40 C	+ 85 C	M41ST87W	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RTC IC with 400 kHz I2C interface in TSSOP8 package. PCF8563TS/5,118 NXP Semiconductors 1: S/ 7.40 394In Stock 15,000On Order	Mfr. Part # PCF8563TS/5,118 Mouser Part # 771-PCF8563TS/5118	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface in TSSOP8 package.	Datasheet	394In Stock 15,000On Order On Order Ship Dates Mfr. #: PCF8563TS/5,118 Stock: 394 Can Ship Immediately On Order: 7,500 Expected 10/23/2026 7,500 Expected 10/28/2026 Factory Lead-Time: 27 Weeks	Cut Tape S/ 7.40 S/ 5.45 S/ 4.98 S/ 4.44 View Reel S/ 3.65 S/ 4.16 S/ 4.05 S/ 4.01 S/ 3.65 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	TSSOP-8	No Backup Switching	1 V	5.5 V	- 40 C	+ 85 C	PCF8563	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock Parallel RTC A 595-B Q4802LYPWR A 595-BQ A 595-BQ4802LYPWR BQ4802LYPW Texas Instruments 1: S/ 39.28 40In Stock End of Life	Mfr. Part # BQ4802LYPW Mouser Part # 595-BQ4802LYPW End of Life	Texas Instruments	Real Time Clock Parallel RTC A 595-B Q4802LYPWR A 595-BQ A 595-BQ4802LYPWR	Datasheet	40In Stock	S/ 39.28 S/ 31.72 S/ 26.94 S/ 24.41 View S/ 24.21 S/ 23.78 S/ 23.36 Quote	Min.: 1 Mult.: 1	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	TSSOP-28	Backup Switching	2.7 V	3.6 V	0 C	+ 70 C	BQ4802LY	SMD/SMT	Tube
Real Time Clock I C Serial Real-Time Clock DS1337U+ Analog Devices / Maxim Integrated 1: S/ 19.54 324In Stock	Mfr. Part # DS1337U+ Mouser Part # 700-DS1337U	Analog Devices / Maxim Integrated	Real Time Clock I C Serial Real-Time Clock Learn More about Analog Devices / Maxim Integrated maxim ds1337 rtc	Datasheet	324In Stock	S/ 19.54 S/ 14.75 S/ 13.51 S/ 12.18 S/ 11.56	Min.: 1 Mult.: 1 Max.: 259	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	uSOP-8	No Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C	DS1337U	SMD/SMT	Tube
Real Time Clock I C RTC with Trickle Charger DS1340U-33+ Analog Devices / Maxim Integrated 1: S/ 25.85 119In Stock	Mfr. Part # DS1340U-33+ Mouser Part # 700-DS1340U-33	Analog Devices / Maxim Integrated	Real Time Clock I C RTC with Trickle Charger Learn More about Analog Devices / Maxim Integrated maximds1343	Datasheet	119In Stock	S/ 25.85 S/ 19.81 S/ 18.14	Min.: 1 Mult.: 1 Max.: 95	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	uSOP-8	Backup Switching	2.97 V	5.5 V	- 40 C	+ 85 C	DS1340U	SMD/SMT	Tube

Real Time Clocks for Thermostats

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