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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 16K (2Kx8) 70ns M48T12-70PC1 STMicroelectronics 1: HK$339.16 844In Stock	Mfr. Part No. M48T12-70PC1 Mouser Part No 511-M48T1270PC1	STMicroelectronics	Real Time Clock 16K (2Kx8) 70ns	Datasheet	844In Stock	HK$339.16 HK$240.44 HK$232.63 HK$221.78 HK$217.01	Min.: 1 Mult.: 1	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	PCDIP-24	Integrated Battery	4.5 V	5.5 V	0 C	+ 70 C	M48T12	Through Hole	Tube
Real Time Clock RTC IC with 400 kHz I2C interface featuring backup battery switch-over function in HXSON10 package. PCF85263ATL/AX NXP Semiconductors 1: HK$10.19 75,855In Stock	Mfr. Part No. PCF85263ATL/AX Mouser Part No 771-PCF85263ATL/AX	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface featuring backup battery switch-over function in HXSON10 package. Learn More about NXP Semiconductors nxp pcf85263a rtc	Datasheet	75,855In Stock	Cut Tape HK$10.19 HK$7.30 HK$6.59 HK$5.99 View Reel HK$4.88 HK$5.63 HK$5.41 HK$5.27 HK$5.24 HK$4.88 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	DFN2626-10	Backup Switching	900 mV	5.5 V	- 40 C	+ 85 C	PCF85263A	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock RTC IC with 400 kHz I2C interface featuring 64 byte SRAM in HXSON10 package. PCF85363ATL/AX NXP Semiconductors 1: HK$11.67 81,184In Stock	Mfr. Part No. PCF85363ATL/AX Mouser Part No 771-PCF85363ATL/AX	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface featuring 64 byte SRAM in HXSON10 package.	Datasheet	81,184In Stock	Cut Tape HK$11.67 HK$9.12 HK$8.55 HK$7.81 View Reel HK$6.63 HK$7.48 HK$7.28 HK$7.22 HK$7.04 HK$6.63 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	DFN2626-10	Backup Switching	900 mV	5.5 V	- 40 C	+ 85 C	PCF85363A	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 64K (8Kx8) 100ns M48T08Y-10MH1F STMicroelectronics 1: HK$338.09 937In Stock	Mfr. Part No. M48T08Y-10MH1F Mouser Part No 511-M48T08Y-10MH1F	STMicroelectronics	Real Time Clock 64K (8Kx8) 100ns	Datasheet	937In Stock	Cut Tape HK$338.09 HK$273.73 HK$257.61 HK$246.93 View Reel HK$217.17 HK$231.48 HK$223.17 HK$217.17 Quote MouseReel Available	Min.: 1 Mult.: 1 : 936	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOX-28	Backup Switching	4.5 V	5.5 V	0 C	+ 70 C	M48T08Y	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 32.768kHz SPI Time Acc. 25ppm AEC RV-3149-C3 32.768kHz OPTION B TB QA Micro Crystal 1: HK$29.59 1,381In Stock	Mfr. Part No. RV-3149-C3 32.768kHz OPTION B TB QA Mouser Part No 428-203684-MG01	Micro Crystal	Real Time Clock 32.768kHz SPI Time Acc. 25ppm AEC Learn More about Micro Crystal real time clock modules	Datasheet	1,381In Stock	Cut Tape HK$29.59 HK$22.28 HK$20.47 HK$18.41 Reel HK$16.85 View HK$17.43 HK$17.18 HK$16.52 HK$16.28 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	SPI	YY-MM-DD-dd	HH:MM:SS (24 hr)		Backup Switching	1.3 V	5.5 V	- 40 C	+ 125 C	RV-3149	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 2Kb EE 64B SRAM WD TED EUI-64 MCP795W22-I/ST Microchip Technology 1: HK$16.28 4,775In Stock	Mfr. Part No. MCP795W22-I/ST Mouser Part No 579-MCP795W22-I/ST	Microchip Technology	Real Time Clock 2Kb EE 64B SRAM WD TED EUI-64 Learn More about Microchip Technology microchip mcp795xx	Datasheet	4,775In Stock	HK$16.28 HK$15.12 HK$14.71	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 4-wire Real Time Clock Module R2045S-E2-FE Nisshinbo 1: HK$38.80 3,632In Stock	Mfr. Part No. R2045S-E2-FE Mouser Part No 848-R2045S-E2-FE	Nisshinbo	Real Time Clock 4-wire Real Time Clock Module	Datasheet	3,632In Stock	Cut Tape HK$38.80 HK$29.35 HK$26.96 HK$24.33 Reel HK$20.80 View HK$23.10 HK$21.54 HK$20.55 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	Serial 4-Wire	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)		No Backup Switching	1.7 V	5.5 V	- 40 C	+ 85 C	R2045S/D	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC R2051S02-E2-F Nisshinbo 1: HK$14.22 2,000In Stock	Mfr. Part No. R2051S02-E2-F Mouser Part No 848-R2051S02E2F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC	Datasheet	2,000In Stock	Cut Tape HK$14.22 HK$10.36 HK$9.45 HK$8.71 HK$6.59 Reel HK$6.58 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-16	Backup Switching	750 mV	5.5 V	- 40 C	+ 85 C	R2051S	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 MCP79412-I/MS Microchip Technology 1: HK$9.70 3,702In Stock	Mfr. Part No. MCP79412-I/MS Mouser Part No 579-MCP79412IMS	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	3,702In Stock	HK$9.70 HK$8.88 HK$8.71	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 64B SRAM EUI-48 MCP79401-I/SN Microchip Technology 1: HK$8.55 12,489In Stock	Mfr. Part No. MCP79401-I/SN Mouser Part No 579-MCP79401ISN	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	12,489In Stock	HK$8.55 HK$7.89 HK$7.60	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 1Kb EE 64B SRAM EUI-64 MCP79412-I/ST Microchip Technology 1: HK$9.70 4,615In Stock	Mfr. Part No. MCP79412-I/ST Mouser Part No 579-MCP79412IST	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-64 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	4,615In Stock	HK$9.70 HK$8.88 HK$8.71	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 I2C GP RTCC 64B SRAM ID MCP79400-I/MS Microchip Technology 1: HK$8.22 5,399In Stock	Mfr. Part No. MCP79400-I/MS Mouser Part No 579-MCP79400IMS	Microchip Technology	Real Time Clock I2C GP RTCC 64B SRAM ID Learn More about Microchip Technology microchip mcp7940n calendar	Datasheet	5,399In Stock	HK$8.22 HK$7.56 HK$7.27	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 RTCC 64B SRAM No VBAT MCP7940MT-I/MS Microchip Technology 1: HK$6.17 6,834In Stock	Mfr. Part No. MCP7940MT-I/MS Mouser Part No 579-MCP7940MT-I/MS	Microchip Technology	Real Time Clock I2C RTCC 64B SRAM No VBAT Learn More about Microchip Technology microchip real time clocks	Datasheet	6,834In Stock	Cut Tape HK$6.17 Reel HK$5.17 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	MSOP-8	No Backup Switching	1.8 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock I C RTC with Trickle Charger DS1340C-3# Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1340C-3# Mouser Part No 700-DS1340C-3#-	Analog Devices / Maxim Integrated	Real Time Clock I C RTC with Trickle Charger Learn More about Analog Devices / Maxim Integrated maximds1343 Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SO-16	Backup Switching	2.7 V	3.3 V	- 40 C	+ 85 C	DS1340C	SMD/SMT	Tube
Real Time Clock I C RTC with 56-Byte NV RAM DS1338Z-33+ Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1338Z-33+ Mouser Part No 700-DS1338Z-33	Analog Devices / Maxim Integrated	Real Time Clock I C RTC with 56-Byte NV RAM Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	Backup Switching	3 V	5.5 V	- 40 C	+ 85 C	DS1338Z	SMD/SMT	Tube
Real Time Clock Y2K-Compliant, Nonvolatile Timekeeping R DS1744WP-120IND+ Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1744WP-120IND+ Mouser Part No 700-DS1744WP-120IND	Analog Devices / Maxim Integrated	Real Time Clock Y2K-Compliant, Nonvolatile Timekeeping R Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	PowerCap Module-34	Backup Switching	2.97 V	3.63 V	- 40 C	+ 85 C	DS1744WP	SMD/SMT	Tray
Real Time Clock I C RTC with Trickle Charger DS1340Z-18+ Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1340Z-18+ Mouser Part No 700-DS1340Z-18	Analog Devices / Maxim Integrated	Real Time Clock I C RTC with Trickle Charger Learn More about Analog Devices / Maxim Integrated maximds1343 Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SO-8	Backup Switching	1.71 V	1.89 V	- 40 C	+ 85 C	DS1340Z	SMD/SMT	Tube
Real Time Clock Extremely Accurate SPI Bus RTC with Inte DS3234SN# Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS3234SN# Mouser Part No 700-DS3234SN#	Analog Devices / Maxim Integrated	Real Time Clock Extremely Accurate SPI Bus RTC with Inte Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SO-20	Backup Switching	2 V	5.5 V	- 40 C	+ 85 C	DS3234SN	SMD/SMT	Tube
Real Time Clock Y2K-Compliant, Nonvolatile Timekeeping R DS1744P-70IND+ Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. DS1744P-70IND+ Mouser Part No 700-DS1744P-70IND	Analog Devices / Maxim Integrated	Real Time Clock Y2K-Compliant, Nonvolatile Timekeeping R Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	PowerCap Module-34	Backup Switching	4.5 V	5.5 V	- 40 C	+ 85 C	DS1744P	SMD/SMT	Tray
Real Time Clock Ultra-Low power 12C Real Time clock w/ p MAX31331EWC+T Analog Devices / Maxim Integrated Restricted Availability	Mfr. Part No. MAX31331EWC+T Mouser Part No 700-MAX31331EWC+T	Analog Devices / Maxim Integrated	Real Time Clock Ultra-Low power 12C Real Time clock w/ p Learn More about Analog Devices / Maxim Integrated maxim max31331 real time clock Mouser does not presently sell this product in your region.	Datasheet			Restricted Availability	I2C	BCD	BCD	WLP-12	Backup Switching	1.1 V	5.5 V	- 40 C	+ 85 C		SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock 64K (8Kx8) 150ns M48T18-150PC1 STMicroelectronics 1: HK$414.86 395In Stock	Mfr. Part No. M48T18-150PC1 Mouser Part No 511-M48T1815PC1	STMicroelectronics	Real Time Clock 64K (8Kx8) 150ns	Datasheet	395In Stock	HK$414.86 HK$304.14 HK$294.03 HK$293.95 Quote Quote	Min.: 1 Mult.: 1	Parallel	YY-MM-DD-dd	HH:MM:SS (24 hr)	PCDIP-28	Integrated Battery	4.5 V	5.5 V	0 C	+ 70 C	M48T18	Through Hole	Tube
Real Time Clock Real Time Clock S-35190A-J8T1U ABLIC 1: HK$11.34 4,632In Stock	Mfr. Part No. S-35190A-J8T1U Mouser Part No 628-35190A-G	ABLIC	Real Time Clock Real Time Clock	Datasheet	4,632In Stock	Cut Tape HK$11.34 HK$9.29 HK$8.80 HK$8.15 View Reel HK$6.58 HK$7.86 HK$7.69 HK$7.62 HK$6.75 HK$6.58 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	Serial 3-Wire	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOP-8	Backup Switching	1.3 V	5.5 V	- 40 C	+ 85 C	S-35190	SMD/SMT	Reel, Cut Tape, MouseReel
Real Time Clock REAL TIME CLK & TEMP COMPENSATED CRYSTAL ISL12022MIBZ Renesas / Intersil 1: HK$61.81 333In Stock	Mfr. Part No. ISL12022MIBZ Mouser Part No 968-ISL12022MIBZ	Renesas / Intersil	Real Time Clock REAL TIME CLK & TEMP COMPENSATED CRYSTAL	Datasheet	333In Stock	HK$61.81 HK$47.68 HK$39.05 HK$36.74 View HK$36.00 HK$35.76 HK$34.85 Quote	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOIC-20	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL12022	SMD/SMT	Tube
Real Time Clock I2CAL TIME CLK/CLNDR W/EVENT DETCT 10LD ISL1209IU10Z Renesas / Intersil 1: HK$33.87 1,062In Stock	Mfr. Part No. ISL1209IU10Z Mouser Part No 968-ISL1209IU10Z	Renesas / Intersil	Real Time Clock I2CAL TIME CLK/CLNDR W/EVENT DETCT 10LD	Datasheet	1,062In Stock	HK$33.87 HK$25.56 HK$22.85 HK$20.55 View HK$19.81 HK$19.32 HK$18.82 HK$17.92	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-10	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1209	SMD/SMT	Tube
Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-48 MCP79411T-I/MS Microchip Technology 1: HK$10.36 4,734In Stock	Mfr. Part No. MCP79411T-I/MS Mouser Part No 579-MCP79411TIMS	Microchip Technology	Real Time Clock I2C GP RTCC 1Kb EE 64B SRAM EUI-48 Learn More about Microchip Technology microchip mcp794xx calendars	Datasheet	4,734In Stock	Cut Tape HK$10.36 Reel HK$8.71 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