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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 (HKD) 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 I2C GP RTCC 64B SRAM MCP7940N-I/SN Microchip Technology 1: HK$6.99 10,207In Stock	Mfr. Part No. MCP7940N-I/SN Mouser Part No 579-MCP7940N-I/SN	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	10,207In Stock	HK$6.99 HK$6.49 HK$6.33	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock I2C GP RTCC 64B SRAM, EXT MCP7940NT-E/MS Microchip Technology 1: HK$8.30 1,997In Stock	Mfr. Part No. MCP7940NT-E/MS Mouser Part No 579-MCP7940NT-E/MS	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM, EXT Learn More about Microchip Technology microchip real time clocks	Datasheet	1,997In Stock	Cut Tape HK$8.30 Reel HK$6.99 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	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	+ 125 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 64B SRAM MCP7940NT-I/MS Microchip Technology 1: HK$8.06 13,482In Stock	Mfr. Part No. MCP7940NT-I/MS Mouser Part No 579-MCP7940NT-I/MS	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	13,482In Stock	Cut Tape HK$8.06 Reel HK$6.75 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	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	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 64B SRAM MCP7940NT-I/ST Microchip Technology 1: HK$8.06 2,163In Stock	Mfr. Part No. MCP7940NT-I/ST Mouser Part No 579-MCP7940NT-I/ST	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	2,163In Stock	Cut Tape HK$8.06 Reel HK$6.75 MouseReel Available	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	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID MCP79410-I/MS Microchip Technology 1: HK$8.88 1,547In Stock	Mfr. Part No. MCP79410-I/MS Mouser Part No 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	1,547In Stock	HK$8.88 HK$8.30 HK$8.12	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/SN Microchip Technology 1: HK$8.55 3,746In Stock	Mfr. Part No. MCP79410-I/SN Mouser Part No 579-MCP79410-I/SN	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	3,746In Stock	HK$8.55 HK$7.89 HK$7.60	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-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 MCP79410T-I/MS Microchip Technology 1: HK$9.70 6,464In Stock	Mfr. Part No. MCP79410T-I/MS Mouser Part No 579-MCP79410T-I/MS	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	6,464In Stock	Cut Tape HK$9.70 Reel HK$8.12 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	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	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 MCP79412-I/SN Microchip Technology 1: HK$9.29 3,227In Stock	Mfr. Part No. MCP79412-I/SN Mouser Part No 579-MCP79412ISN	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	3,227In Stock	HK$9.29 HK$8.63 HK$8.47	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-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 EUI-64 MCP79412T-I/MNY Microchip Technology 1: HK$10.77 4,787In Stock	Mfr. Part No. MCP79412T-I/MNY Mouser Part No 579-MCP79412TIMNY	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	4,787In Stock	Cut Tape HK$10.77 Reel HK$8.96 MouseReel Available	Min.: 1 Mult.: 1 : 3,300	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TDFN-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 MCP79412T-I/SN Microchip Technology 1: HK$10.11 10,025In Stock	Mfr. Part No. MCP79412T-I/SN Mouser Part No 579-MCP79412TISN	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	10,025In Stock	Cut Tape HK$10.11 Reel HK$8.47 MouseReel Available	Min.: 1 Mult.: 1 : 3,300	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM ID MCP79510-I/MS Microchip Technology 1: HK$10.60 1,127In Stock 1,600Expected 2/11/2026	Mfr. Part No. MCP79510-I/MS Mouser Part No 579-MCP79510-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp795xx	Datasheet	1,127In Stock 1,600Expected 2/11/2026	HK$10.60 HK$9.86 HK$9.54	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 SPI GP RTCC 1Kb EE 64B SRAM ID MCP79510T-I/MS Microchip Technology 1: HK$11.34 2,809In Stock	Mfr. Part No. MCP79510T-I/MS Mouser Part No 579-MCP79510T-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp795xx	Datasheet	2,809In Stock	Cut Tape HK$11.34 Reel HK$9.54 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Serial, I2C, SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)		Backup Switching	1.8 V	3.6 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM EUI-48 MCP79511T-I/MS Microchip Technology 1: HK$12.25 1,581In Stock	Mfr. Part No. MCP79511T-I/MS Mouser Part No 579-MCP79511T-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 1Kb EE 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp795xx	Datasheet	1,581In Stock	Cut Tape HK$12.25 Reel HK$10.28	Min.: 1 Mult.: 1 : 2,500	Serial, I2C, SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)		Backup Switching	1.8 V	3.6 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape
Real Time Clock SPI GP RTCC 2Kb EE 64B SRAM ID MCP79520-I/MS Microchip Technology 1: HK$11.43 8,158In Stock	Mfr. Part No. MCP79520-I/MS Mouser Part No 579-MCP79520-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 2Kb EE 64B SRAM ID Learn More about Microchip Technology microchip mcp795xx	Datasheet	8,158In Stock	HK$11.43 HK$10.52 HK$10.28	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 SPI GP RTCC 2Kb EE 64B SRAM EUI-64 MCP79522-I/MS Microchip Technology 1: HK$12.17 1,395In Stock	Mfr. Part No. MCP79522-I/MS Mouser Part No 579-MCP79522-I/MS	Microchip Technology	Real Time Clock SPI GP RTCC 2Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp795xx	Datasheet	1,395In Stock	HK$12.17 HK$11.26 HK$11.01	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 1Kb EE 64B SRAM WD TED ID MCP795W10-I/ST Microchip Technology 1: HK$14.88 3,232In Stock	Mfr. Part No. MCP795W10-I/ST Mouser Part No 579-MCP795W10-I/ST	Microchip Technology	Real Time Clock 1Kb EE 64B SRAM WD TED ID Learn More about Microchip Technology microchip mcp795xx	Datasheet	3,232In Stock	HK$14.88 HK$13.65 HK$13.32	Min.: 1 Mult.: 1	SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-14	Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Tube
Real Time Clock 32.768 KHZ 8 PIN AB-RTCMC-32.768KHZ-AIGZ-S7-T ABRACON 1: HK$38.63 2,812In Stock 2,000Expected 30/10/2026	Mfr. Part No. AB-RTCMC-32.768KHZ-AIGZ-S7-T Mouser Part No 815-ABMC-327AIGZS7T	ABRACON	Real Time Clock 32.768 KHZ 8 PIN Learn More about ABRACON Abracon ABRTC MC	Datasheet	2,812In Stock 2,000Expected 30/10/2026	Cut Tape HK$38.63 HK$29.18 HK$26.88 HK$22.28 Reel HK$20.96 View HK$21.87 HK$20.39 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)		No Backup Switching	1.3 V	4.4 V	- 40 C	+ 85 C	AB-RTCMC	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 32.768 KHZ IC RTC CLK AB-RTCMC-32.768kHz-EOA9-S3-DBT ABRACON 1: HK$69.71 1,641In Stock	Mfr. Part No. AB-RTCMC-32.768kHz-EOA9-S3-DBT Mouser Part No 815-ABMC-327EOA9S3DB	ABRACON	Real Time Clock 32.768 KHZ IC RTC CLK Learn More about ABRACON Abracon ABRTC MC	Datasheet	1,641In Stock	Cut Tape HK$69.71 HK$54.01 HK$48.99 HK$45.37 Reel HK$40.85 View HK$43.40 HK$42.42 HK$39.37 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	SPI	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	1.4 V	5.5 V	- 40 C	+ 125 C	AB-RTCMC	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 32.768 KHZ AB-RTCMC-32.768kHz-EOZ9-S3-DBT ABRACON 1: HK$72.75 1,871In Stock	Mfr. Part No. AB-RTCMC-32.768kHz-EOZ9-S3-DBT Mouser Part No 815-ABMC-327EOZ9S3DB	ABRACON	Real Time Clock 32.768 KHZ Learn More about ABRACON Abracon ABRTC MC	Datasheet	1,871In Stock	Cut Tape HK$72.75 HK$56.39 HK$50.14 HK$46.36 View Reel HK$42.50 HK$44.39 HK$43.16 HK$42.50 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	1.4 V	5.5 V	- 40 C	+ 85 C	AB-RTCMC	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC R2223L-E2 Nisshinbo 1: HK$13.56 5,351In Stock	Mfr. Part No. R2223L-E2 Mouser Part No 848-R2223L-E2	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC		5,351In Stock	Cut Tape HK$13.56 HK$9.95 HK$8.96 HK$7.90 Reel HK$6.59 View HK$7.42 HK$7.13 HK$7.04 HK$6.44 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	Serial 2-Wire, I2C	BCD	BCD	QFN1818-12	No Backup Switching	1.5 V	5.5 V	- 40 C	+ 85 C	R2223L	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC RV5C387A-E2-F Nisshinbo 1: HK$13.48 6,845In Stock	Mfr. Part No. RV5C387A-E2-F Mouser Part No 848-RV5C387A-E2-F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC	Datasheet	6,845In Stock	Cut Tape HK$13.48 HK$9.86 HK$8.96 HK$8.55 Reel HK$7.23 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-10	No Backup Switching	2 V	5.5 V	- 40 C	+ 85 C	RV5C387	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 64k NV SRAM with Phantom Clock DS1243Y-120+ Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1243Y-120+ Mouser Part No 700-DS1243Y-120	Analog Devices / Maxim Integrated	Real Time Clock 64k NV SRAM with Phantom Clock Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	Parallel	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	EDIP-28	Integrated Battery	4.5 V	5.5 V	0 C	+ 70 C	DS1243Y	Through Hole	Tube
Real Time Clock 4096k NV SRAM with Phantom Clock DS1251WP-120IND+ Analog Devices / Maxim Integrated Shipping Restricted	Mfr. Part No. DS1251WP-120IND+ Mouser Part No 700-DS1251WP-120IND	Analog Devices / Maxim Integrated	Real Time Clock 4096k NV SRAM with Phantom Clock Mouser does not sell this product in your region.	Datasheet			Shipping Restricted	Parallel	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	PowerCap Module-34		2.97 V	3.63 V	- 40 C	+ 85 C	DS1251WP	SMD/SMT	Tray
Real Time Clock 4096k NV SRAM with Phantom Clock DS1251Y-70+ Analog Devices / Maxim Integrated Shipping Restricted	Mfr. Part No. DS1251Y-70+ Mouser Part No 700-DS1251Y-70	Analog Devices / Maxim Integrated	Real Time Clock 4096k NV SRAM with Phantom Clock Mouser does not sell this product in your region.	Datasheet			Shipping Restricted	Parallel, Phantom Clock	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	EDIP-32	Integrated Battery	4.5 V	5.5 V	0 C	+ 70 C	DS1251Y	Through Hole	Tube
Real Time Clock Real-Time Clocks DS12885S+T&R Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS12885S+T&R Mouser Part No 700-DS12885ST&R	Analog Devices / Maxim Integrated	Real Time Clock Real-Time Clocks Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	Multiplexed	YY-MM-DD-dd	HH:MM:SS (24 hr)	SO-24		4.5 V	5.5 V	0 C	+ 70 C	DS12885S	SMD/SMT	Reel, Cut Tape, MouseReel