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Real Time Clock

Real Time Clocks are in stock with same-day shipping at Mouser from industry leading manufacturers. Mouser is an authorized distributor for many real time clock manufacturers including Analog Devices, Epson, Microchip, Micro Crystal, NXP, Renesas Electronics, STMicroelectronics & more.
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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (USD) 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 2-Wire Real Time Clock IC RS5C372A-E2-F Nisshinbo 1: $1.65 4,000On Order	Mfr. Part No. RS5C372A-E2-F Mouser Part No 848-RS5C372AE2F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC Learn More about Nisshinbo ricoh rtcs	Datasheet	4,000On Order On Order Ship Dates Mfr. No: RS5C372A-E2-F Stock: 0 On Order: 2,000 Expected 20/11/2026 2,000 Expected 05/01/2027 Factory Lead Time: 15 Weeks	Cut Tape $1.65 $1.21 $1.09 $0.961 Reel $0.813 View $0.903 $0.868 $0.857 $0.795 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SSOP-8	Backup Switching	1.7 V	6 V	- 40 C	+ 85 C	RS5C372	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION RV5C338A-E2-F Nisshinbo 1: $1.64 2,000Expected 05/11/2026	Mfr. Part No. RV5C338A-E2-F Mouser Part No 848-RV5C338A-E2-F	Nisshinbo	Real Time Clock 3-WIRE SERIAL INTERFACE REAL-TIME CLOCK ICs WITH VOLTAGE MONITORING FUNCTION	Datasheet	2,000Expected 05/11/2026	Cut Tape $1.64 $1.20 $1.09 $1.03 Reel $0.79 View $0.793 $0.784	Min.: 1 Mult.: 1 : 2,000				SSOP-10						RV5C338A		Reel, Cut Tape
Real Time Clock REAL TIME CLK/CLNDR W/TEMP COMP 8 L ISL12022IBZ-T Renesas / Intersil 1: $5.22 2,467Expected 12/01/2027	Mfr. Part No. ISL12022IBZ-T Mouser Part No 968-ISL12022IBZ-T	Renesas / Intersil	Real Time Clock REAL TIME CLK/CLNDR W/TEMP COMP 8 L	Datasheet	2,467Expected 12/01/2027	Cut Tape $5.22 $3.97 $3.66 $3.32 $3.29 Reel $3.29 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOIC-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL12022	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz 1337AGDCGI8 Renesas Electronics 1: $3.50 2,700Expected 13/03/2028	Mfr. Part No. 1337AGDCGI8 Mouser Part No 972-1337AGDCGI8	Renesas Electronics	Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz	Datasheet	2,700Expected 13/03/2028	Cut Tape $3.50 $2.61 $2.39 $2.14 View Reel $1.88 $2.02 $1.98 $1.89 $1.88 MouseReel Available	Min.: 1 Mult.: 1 : 3,000				SOIC-8						1337AGD	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock .9RTC BASE 1338-31DCGI Renesas Electronics 1: $3.90 1,305Expected 18/02/2028	Mfr. Part No. 1338-31DCGI Mouser Part No 972-1338-31DCGI	Renesas Electronics	Real Time Clock .9RTC BASE	Datasheet	1,305Expected 18/02/2028	$3.90 $2.92 $2.56 $2.36 View $2.25 $2.24	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	Backup Switching	1.3 V	3.7 V	- 40 C	+ 85 C	1338	SMD/SMT	Tube
Real Time Clock Real Time Clock 1339-31DVGI8 Renesas Electronics 1: $3.32 2,500Expected 17/01/2028	Mfr. Part No. 1339-31DVGI8 Mouser Part No 972-1339-31DVGI8	Renesas Electronics	Real Time Clock Real Time Clock	Datasheet	2,500Expected 17/01/2028	Cut Tape $3.32 $2.48 $2.35 Reel $1.84	Min.: 1 Mult.: 1 : 2,500	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	Backup Switching	1.3 V	3.7 V	- 40 C	+ 85 C	1339	SMD/SMT	Reel, Cut Tape
Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM EUI-64 MCP79512-I/MS Microchip Technology 1: $1.39 500Expected 28/10/2026	Mfr. Part No. MCP79512-I/MS Mouser Part No 579-MCP79512-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp795xx	Datasheet	500Expected 28/10/2026	$1.39 $1.28 $1.22	Min.: 1 Mult.: 1	SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	MSOP-10	Backup Switching	1.8 V	3.6 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock 256K (32Kx8) 70ns M48T37Y-70MH1F STMicroelectronics 1: $20.51 28In Stock	Mfr. Part No. M48T37Y-70MH1F Mouser Part No 511-M48T37Y-70MH1F	STMicroelectronics	Real Time Clock 256K (32Kx8) 70ns	Datasheet	28In Stock	Cut Tape $20.51 $17.63 $16.48 $14.59 View Reel $13.48 $14.23 $13.50 $13.48 Quote MouseReel Available	Min.: 1 Mult.: 1 : 936	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOIC-44	Backup Switching	4.5 V	5.5 V	0 C	+ 70 C	M48T37Y	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 32.768kHz, 20PPM, Real-Time Clock Module with SPI-Bus RV-8063-C8 32.768kHz-20PPM-TA-QC Micro Crystal 1: $1.51 1,000Expected 05/02/2027	Mfr. Part No. RV-8063-C8 32.768kHz-20PPM-TA-QC Mouser Part No 428-204233-MC01	Micro Crystal	Real Time Clock 32.768kHz, 20PPM, Real-Time Clock Module with SPI-Bus Learn More about Micro Crystal rv 8063 c8 rtc modules	Datasheet	1,000Expected 05/02/2027	Cut Tape $1.51 $1.11 $0.991 $0.879 Reel $0.794 View $0.826 $0.818 $0.755 $0.739 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SON-8		900 mV	5.5 V	- 40 C	+ 85 C	RV-8063-C8	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz 1337AGDCGI Renesas Electronics 1: $3.50 291Expected 18/02/2028	Mfr. Part No. 1337AGDCGI Mouser Part No 972-1337AGDCGI	Renesas Electronics	Real Time Clock RTC I2c Serial IC 1.8 to 5.5V 32kHz	Datasheet	291Expected 18/02/2028	$3.50 $2.61 $2.39 $2.13 $2.03	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	No Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C	1337AGD	SMD/SMT	Tube
Real Time Clock 1338D-31 REAL TIME CLOCK 1338D-31DVGI Renesas Electronics 1: $2.90 384Expected 18/02/2028	Mfr. Part No. 1338D-31DVGI Mouser Part No 972-1338D-31DVGI	Renesas Electronics	Real Time Clock 1338D-31 REAL TIME CLOCK	Datasheet	384Expected 18/02/2028	$2.90 $2.17 $1.98 $1.77 $1.65	Min.: 1 Mult.: 1										1338		Tube
Real Time Clock 3.0Volt -40 to 85C I2C BUS RX-8035LC:B3 PURE SN Epson Timing 1: $10.00 500Expected 06/11/2026	Mfr. Part No. RX-8035LC:B3 PURE SN Mouser Part No 732-RX-8035LC:B3	Epson Timing	Real Time Clock 3.0Volt -40 to 85C I2C BUS	Datasheet	500Expected 06/11/2026	Cut Tape $10.00 $7.78 $7.23 $6.62 Reel $6.29 View $6.10 $5.98 Quote MouseReel Available	Min.: 1 Mult.: 1 : 250	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	VSOJ-12	Backup Switching	2.4 V	5.5 V	- 40 C	+ 85 C	RX-8035LC	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RX4111CE:B6 REAL TIME CLOCK SPI-BUS 3.0V 23PPM 2K TR RX4111CE B6 Epson Timing 1: $1.93 356In Stock 4,000Expected 16/11/2026	Mfr. Part No. RX4111CE B6 Mouser Part No 732-RX4111CEB6	Epson Timing	Real Time Clock RX4111CE:B6 REAL TIME CLOCK SPI-BUS 3.0V 23PPM 2K TR Learn More about Epson Timing epson rx4111ce rx8111ce rtc modules	Datasheet	356In Stock 4,000Expected 16/11/2026	Cut Tape $1.93 $1.42 $1.29 $1.15 Reel $0.972 View $1.08 $1.04 $1.03 $0.95 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	Serial 4-Wire, SPI				Backup Switching	1.6 V	5.5 V	- 40 C	+ 85 C	RTC	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RX4901CE XB C0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR RX4901CE XB C06 Epson Timing 1: $4.63 1,023Expected 28/12/2026	Mfr. Part No. RX4901CE XB C06 Mouser Part No 732-RX4901CEXBC06	Epson Timing	Real Time Clock RX4901CE XB C0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR Learn More about Epson Timing epson rx8901ce rx4901ce real time clock modules	Datasheet	1,023Expected 28/12/2026	Cut Tape $4.63 $3.50 $3.22 $2.91 View Reel $2.48 $2.76 $2.72 $2.58 $2.48 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	1.6 V	5.5 V	- 40 C	+ 105 C	RX4901CE	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RX8111CE:B3 REAL TIME CLOCK I2C-BUS 3.0V 23PPM 250TR RX8111CE B3 Epson Timing 1: $3.61 1,750On Order	Mfr. Part No. RX8111CE B3 Mouser Part No 732-RX8111CEB3	Epson Timing	Real Time Clock RX8111CE:B3 REAL TIME CLOCK I2C-BUS 3.0V 23PPM 250TR Learn More about Epson Timing epson rx4111ce rx8111ce rtc modules	Datasheet	1,750On Order On Order Ship Dates Mfr. No: RX8111CE B3 Stock: 0 On Order: 750 Expected 04/11/2026 1,000 Expected 26/04/2027 Factory Lead Time: 20 Weeks	Cut Tape $3.61 $2.70 $2.47 $2.22 Reel $1.99 View $1.92 $1.86 MouseReel Available	Min.: 1 Mult.: 1 : 250	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	1.6 V	5.5 V	- 40 C	+ 85 C	RX8111CE	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 32.768kHz-DTCXO 3.4ppm I2C-Bus RX8900CE UA0 Epson Timing 1: $3.97 886On Order	Mfr. Part No. RX8900CE UA0 Mouser Part No 732-RX8900CEUA0	Epson Timing	Real Time Clock 32.768kHz-DTCXO 3.4ppm I2C-Bus Learn More about Epson Timing epson rx8900ce rtc modules	Datasheet	886On Order	Cut Tape $3.97 $3.00 $2.76 $2.49 View Reel $2.25 $2.36 $2.30 $2.25 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	2.5 V	5.5 V	- 40 C	+ 85 C	RX8900CE	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RX8901CE XS A0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR RX8901CE XS A06 Epson Timing 1: $6.03 2,000Expected 07/12/2026	Mfr. Part No. RX8901CE XS A06 Mouser Part No 732-RX8901CEXSA06	Epson Timing	Real Time Clock RX8901CE XS A0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR Learn More about Epson Timing epson rx8901ce rx4901ce real time clock modules	Datasheet	2,000Expected 07/12/2026	Cut Tape $6.03 $4.62 $4.27 $3.88 View Reel $3.42 $3.70 $3.66 $3.42 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)		No Backup Switching	1.6 V	5.5 V	- 40 C	+ 105 C	RX8901CE	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock Real Time Clock TSSOP-8 T&R 2.5K PT7C4563CLEX Diodes Incorporated 2,500: $0.466 17,500Factory Stock Available New Product	Mfr. Part No. PT7C4563CLEX Mouser Part No 621-PT7C4563CLEX New Product	Diodes Incorporated	Real Time Clock Real Time Clock TSSOP-8 T&R 2.5K	Datasheet	17,500Factory Stock Available More Info Available	Reel $0.466	Min.: 2,500 Mult.: 2,500 : 2,500	I2C	BCD	BCD	TSSOP-8		1.3 V	5.5 V	- 40 C	+ 85 C	PT7C4563C	SMD/SMT	Reel
Real Time Clock RX4111CE:B3 REAL TIME CLOCK SPI-BUS 3.0V 23PPM 250TR RX4111CE B3 Epson Timing 1: $3.90 250Expected 03/02/2027	Mfr. Part No. RX4111CE B3 Mouser Part No 732-RX4111CEB3	Epson Timing	Real Time Clock RX4111CE:B3 REAL TIME CLOCK SPI-BUS 3.0V 23PPM 250TR Learn More about Epson Timing epson rx4111ce rx8111ce rtc modules	Datasheet	250Expected 03/02/2027	Cut Tape $3.90 $2.94 $2.70 $2.44 Reel $2.27 View $2.24 $2.14 $2.11 $2.09 MouseReel Available	Min.: 1 Mult.: 1 : 250	Serial 4-Wire, SPI				Backup Switching	1.6 V	5.5 V	- 40 C	+ 85 C	RX4111CE	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 64B SRAM ID MCP79400T-I/MNY Microchip Technology 1: $1.11 Non-Stocked Lead-Time 12 Weeks	Mfr. Part No. MCP79400T-I/MNY Mouser Part No 579-MCP79400TIMNY	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM ID Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 12 Weeks	Cut Tape $1.11 Reel $0.924	Min.: 1 Mult.: 1 : 3,300												Reel, Cut Tape
Real Time Clock I2C GP RTCC 64B SRAM ID MCP79400T-I/ST Microchip Technology 2,500: $0.885 Non-Stocked Lead-Time 10 Weeks	Mfr. Part No. MCP79400T-I/ST Mouser Part No 579-MCP79400TIST	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM ID Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 10 Weeks	Reel $0.885	Min.: 2,500 Mult.: 2,500 : 2,500												Reel
Real Time Clock I2C GP RTCC 64B SRAM EUI-48 MCP79401T-I/MS Microchip Technology 2,500: $0.988 Non-Stocked Lead-Time 9 Weeks	Mfr. Part No. MCP79401T-I/MS Mouser Part No 579-MCP79401TIMS	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 9 Weeks	Reel $0.988	Min.: 2,500 Mult.: 2,500 : 2,500												Reel
Real Time Clock I2C GP RTCC 64B SRAM EUI-48 MCP79401T-I/SN Microchip Technology 3,300: $0.924 Non-Stocked Lead-Time 10 Weeks	Mfr. Part No. MCP79401T-I/SN Mouser Part No 579-MCP79401TISN	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 10 Weeks	Reel $0.924	Min.: 3,300 Mult.: 3,300 : 3,300												Reel
Real Time Clock I2C GP RTCC 64B SRAM EUI-48 MCP79401T-I/ST Microchip Technology 2,500: $0.988 Non-Stocked Lead-Time 10 Weeks	Mfr. Part No. MCP79401T-I/ST Mouser Part No 579-MCP79401TIST	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 10 Weeks	Reel $0.988	Min.: 2,500 Mult.: 2,500 : 2,500												Reel
Real Time Clock I2C GP RTCC 64B SRAM EUI-64 MCP79402-I/ST Microchip Technology 1: $1.08 Non-Stocked Lead-Time 10 Weeks	Mfr. Part No. MCP79402-I/ST Mouser Part No 579-MCP79402IST	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	Non-Stocked Lead-Time 10 Weeks	$1.08 $1.01 $0.988	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