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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	Qualification	Time Keeping Current	Packaging
Real Time Clock Real Time Clock S-35390A-T8T1U ABLIC 1: $1.85 2,585In Stock	Mfr. Part # S-35390A-T8T1U Mouser Part # 628-S-35390A-T8T1U	ABLIC	Real Time Clock Real Time Clock Learn More about ABLIC seiko s 35390a clocks	Datasheet	2,585In Stock	Cut Tape $1.85 $1.36 $1.24 $1.10 View Reel $0.853 $1.04 $0.985 $0.98 $0.946 $0.853 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	No Backup Switching	1.3 V	5.5 V	- 40 C	+ 85 C	S-35390	SMD/SMT		250 nA	Reel, Cut Tape, MouseReel
Real Time Clock Real-time Clock Mod I2C Bus PT7C4337WEX Diodes Incorporated 1: $1.08 3,983In Stock	Mfr. Part # PT7C4337WEX Mouser Part # 729-PT7C4337WEX	Diodes Incorporated	Real Time Clock Real-time Clock Mod I2C Bus Learn More about Diodes Incorporated diodes timing solutions	Datasheet	3,983In Stock	Cut Tape $1.08 $0.774 $0.676 $0.614 View Reel $0.513 $0.592 $0.58 $0.57 $0.513 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)		No Backup Switching	1.2 V	5.5 V	- 40 C	+ 85 C		SMD/SMT		450 nA	Reel, Cut Tape, MouseReel
Real Time Clock Automotive RTC module, featuring I2C or SPI interface in HLSON16 package. PCA2131TF/Q900Y NXP Semiconductors 1: $4.36 3,204In Stock	Mfr. Part # PCA2131TF/Q900Y Mouser Part # 771-PCA2131TF/Q900Y	NXP Semiconductors	Real Time Clock Automotive RTC module, featuring I2C or SPI interface in HLSON16 package. Learn More about NXP Semiconductors nxp pca2131 rtc	Datasheet	3,204In Stock	Cut Tape $4.36 $3.33 $3.08 $2.81 View Reel $2.38 $2.68 $2.65 $2.51 $2.50 $2.38	Min.: 1 Mult.: 1 : 4,000										PCA2131		AEC-Q100		Reel, Cut Tape
Real Time Clock RTC IC with 400 kHz I2C interface in TSSOP8 package. PCF85063ATT/AJ NXP Semiconductors 1: $0.95 6,025In Stock 27,500On Order	Mfr. Part # PCF85063ATT/AJ Mouser Part # 771-PCF85063ATT/AJ	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface in TSSOP8 package. Learn More about NXP Semiconductors nxp pcf85063 clocks	Datasheet	6,025In Stock 27,500On Order On Order Ship Dates Mfr. #: PCF85063ATT/AJ Stock: 6,025 Can Ship Immediately On Order: 15,000 Expected 3/1/2027 12,500 Expected 7/5/2027 Factory Lead-Time: 27 Weeks	Cut Tape $0.95 $0.646 $0.581 $0.541 View Reel $0.455 $0.504 $0.482 $0.474 $0.455 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	No Backup Switching	900 mV	5.5 V	- 40 C	+ 85 C	PCF85063A	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock RTC IC with 400 kHz SPI Interface in HXSON10 package. PCF85063BTL/1,118 NXP Semiconductors 1: $0.80 13,127In Stock	Mfr. Part # PCF85063BTL/1,118 Mouser Part # 771-PCF85063BTL1118	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz SPI Interface in HXSON10 package. Learn More about NXP Semiconductors nxp pcf85063 clocks	Datasheet	13,127In Stock	Cut Tape $0.80 $0.579 $0.525 $0.479 View Reel $0.381 $0.446 $0.426 $0.414 $0.404 $0.381 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	DFN2626-10	No Backup Switching	900 mV	5.5 V	- 40 C	+ 85 C	PCF85063B	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock RTC IC with 400 kHz I2C interface featuring backup battery switch-over function in TSSOP10 package. PCF85263ATT1/AZ NXP Semiconductors 1: $1.45 5,388In Stock 7,500Expected 11/16/2026	Mfr. Part # PCF85263ATT1/AZ Mouser Part # 771-PCF85263ATT1/AZ	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface featuring backup battery switch-over function in TSSOP10 package. Learn More about NXP Semiconductors nxp pcf85263a rtc	Datasheet	5,388In Stock 7,500Expected 11/16/2026	Cut Tape $1.45 $1.06 $0.955 $0.844 Reel $0.714 View $0.791 $0.759 $0.733 $0.69 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-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 TSSOP8 package. PCF85363ATT/AJ NXP Semiconductors 1: $1.70 7,724In Stock 5,000Expected 5/3/2027	Mfr. Part # PCF85363ATT/AJ Mouser Part # 771-PCF85363ATT/AJ	NXP Semiconductors	Real Time Clock RTC IC with 400 kHz I2C interface featuring 64 byte SRAM in TSSOP8 package. Learn More about NXP Semiconductors nxp pcf85063 clocks	Datasheet	7,724In Stock 5,000Expected 5/3/2027	Cut Tape $1.70 $1.25 $1.13 $0.995 Reel $0.83 View $0.935 $0.898 $0.887 $0.825 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-8	Backup Switching	900 mV	5.5 V	- 40 C	+ 85 C	PCF85363A	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: $1.82 15,129In Stock	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	15,129In Stock	Cut Tape $1.82 $1.34 $1.22 $1.10 Reel $0.918 View $1.04 $1.01 $0.99 $0.902 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 Hi Prec I2C-Bus Real Time Clock Mod R2025S-E2-FE Nisshinbo 1: $4.48 2,262In Stock	Mfr. Part # R2025S-E2-FE Mouser Part # 848-R2025S-E2-FE	Nisshinbo	Real Time Clock Hi Prec I2C-Bus Real Time Clock Mod Learn More about Nisshinbo ricoh r2025 i2c bus rtc module	Datasheet	2,262In Stock	Cut Tape $4.48 $3.39 $3.12 $2.82 Reel $2.54 View $2.67 $2.64 $2.42 $2.32 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	Serial 2-Wire, I2C	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	R2025S/D	SMD/SMT		600 nA	Reel, Cut Tape, MouseReel
Real Time Clock 4-Wire Real Time Clock IC R2043T-E2-F Nisshinbo 1: $1.51 2,176In Stock	Mfr. Part # R2043T-E2-F Mouser Part # 848-R2043TE2F	Nisshinbo	Real Time Clock 4-Wire Real Time Clock IC	Datasheet	2,176In Stock	Cut Tape $1.51 $1.10 $0.987 $0.876 Reel $0.741 View $0.822 $0.79 $0.781 $0.725 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	Serial 4-Wire, SPI	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-10	No Backup Switching	1.7 V	5.5 V	- 40 C	+ 85 C	R2043T	SMD/SMT		450 nA	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC R2051S01-E2-F Nisshinbo 1: $1.78 4,120In Stock	Mfr. Part # R2051S01-E2-F Mouser Part # 848-R2051S01E2F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC	Datasheet	4,120In Stock	Cut Tape $1.78 $1.31 $1.19 $1.05 Reel $0.885 View $0.982 $0.944 $0.927 $0.865 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		400 nA	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC R2221T-E2-F Nisshinbo 1: $1.66 2,268In Stock	Mfr. Part # R2221T-E2-F Mouser Part # 848-R2221TE2F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC	Datasheet	2,268In Stock	Cut Tape $1.66 $1.22 $1.10 $0.976 Reel $0.821 View $0.917 $0.881 $0.864 $0.802 MouseReel Available	Min.: 1 Mult.: 1 : 2,000	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	TSSOP-10	No Backup Switching	1.5 V	5.5 V	- 40 C	+ 85 C	R2221T	SMD/SMT		180 nA	Reel, Cut Tape, MouseReel
Real Time Clock 2-Wire Real Time Clock IC RS5C372A-E2-F Nisshinbo 1: $1.65 2,000In Stock 2,000Expected 1/5/2027	Mfr. Part # RS5C372A-E2-F Mouser Part # 848-RS5C372AE2F	Nisshinbo	Real Time Clock 2-Wire Real Time Clock IC Learn More about Nisshinbo ricoh rtcs	Datasheet	2,000In Stock 2,000Expected 1/5/2027	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		800 nA	Reel, Cut Tape, MouseReel
Real Time Clock Real Time Clock A 92 6-DP8573AVX/NOPB A A 926-DP8573AVX/NOPB DP8573AV/NOPB Texas Instruments 1: $35.51 73In Stock	Mfr. Part # DP8573AV/NOPB Mouser Part # 926-DP8573AV/NOPB	Texas Instruments	Real Time Clock Real Time Clock A 92 6-DP8573AVX/NOPB A A 926-DP8573AVX/NOPB	Datasheet	73In Stock	$35.51 $32.44 $30.53 $27.20 View $25.79 Quote	Min.: 1 Mult.: 1	Parallel	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	PLCC-28	Backup Switching	4.5 V	5.5 V	- 40 C	+ 85 C	DP8573A	SMD/SMT		10 uA	Tube
Real Time Clock LW PWR RTC W/RESEAL 8LD ISL12008IB8Z Renesas / Intersil 1: $3.23 3,210In Stock	Mfr. Part # ISL12008IB8Z Mouser Part # 968-ISL12008IB8Z	Renesas / Intersil	Real Time Clock LW PWR RTC W/RESEAL 8LD	Datasheet	3,210In Stock	$3.23 $2.41 $2.21 $1.99 View $1.88 $1.78 $1.72 $1.69 $1.64	Min.: 1 Mult.: 1	Serial 2-Wire, I2C	YY-MM-DD-dd	HH:MM:SS:hh (12 hr, 24 hr)	SOIC-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL12008	SMD/SMT			Tube
Real Time Clock LDAL TIME CLK & TEMP COMPENSATED CR ISL12020MIRZ-T7A Renesas / Intersil 1: $11.66 410In Stock	Mfr. Part # ISL12020MIRZ-T7A Mouser Part # 968-ISL12020MIRZ-T7A	Renesas / Intersil	Real Time Clock LDAL TIME CLK & TEMP COMPENSATED CR	Datasheet	410In Stock	Cut Tape $11.66 $9.11 $8.47 $7.77 Reel $7.40 View $7.06 $6.92 Quote MouseReel Available	Min.: 1 Mult.: 1 : 250	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	DFN-20	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL12020	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock REAL TIME CLK ENHANC CD ESD & MOISTURESIS ISL12022MAIBZ Renesas / Intersil 1: $7.46 433In Stock	Mfr. Part # ISL12022MAIBZ Mouser Part # 968-ISL12022MAIBZ	Renesas / Intersil	Real Time Clock REAL TIME CLK ENHANC CD ESD & MOISTURESIS	Datasheet	433In Stock	$7.46 $5.75 $5.32 $4.85 View $4.49 $4.35 $4.14	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 REAL TIME CLK W/ ALARM DS1337 COMP ISL12057IUZ-T Renesas / Intersil 1: $2.92 4,696In Stock	Mfr. Part # ISL12057IUZ-T Mouser Part # 968-ISL12057IUZ-T	Renesas / Intersil	Real Time Clock REAL TIME CLK W/ ALARM DS1337 COMP	Datasheet	4,696In Stock	Cut Tape $2.92 $2.18 $1.99 $1.79 Reel $1.52 View $1.69 $1.64 $1.59 $1.47 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-8	No Backup Switching	1.8 V	3.6 V	- 40 C	+ 85 C	ISL12057	SMD/SMT		500 nA	Reel, Cut Tape, MouseReel
Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD ISL1208IB8Z Renesas / Intersil 1: $2.96 1,354In Stock	Mfr. Part # ISL1208IB8Z Mouser Part # 968-ISL1208IB8Z	Renesas / Intersil	Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD	Datasheet	1,354In Stock	$2.96 $2.15 $1.97 $1.77 View $1.67 $1.63 $1.55 $1.52 $1.50	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOIC-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1208	SMD/SMT			Tube
Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD ISL1208IB8Z-TK Renesas / Intersil 1: $2.95 7,326In Stock 5,000Expected 3/22/2027	Mfr. Part # ISL1208IB8Z-TK Mouser Part # 968-ISL1208IB8Z-TK	Renesas / Intersil	Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD	Datasheet	7,326In Stock 5,000Expected 3/22/2027	Cut Tape $2.95 $2.20 $2.01 $1.81 Reel $1.58 View $1.71 $1.66 $1.53 $1.50 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	SOIC-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1208	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD ISL1208IU8Z Renesas / Intersil 1: $3.61 2,071In Stock	Mfr. Part # ISL1208IU8Z Mouser Part # 968-ISL1208IU8Z	Renesas / Intersil	Real Time Clock I2C REAL TIME CLOCK/ CALENDAR 8LD	Datasheet	2,071In Stock	$3.61 $2.68 $2.29 $2.18 View $2.10 $2.09 $2.04 $1.90 $1.87	Min.: 1 Mult.: 1	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1208	SMD/SMT			Tube
Real Time Clock I2CAL TIME CLK/CLNDR 8LD ISL1208IU8Z-T7A Renesas / Intersil 1: $5.09 2,869In Stock	Mfr. Part # ISL1208IU8Z-T7A Mouser Part # 968-ISL1208IU8Z-T7A	Renesas / Intersil	Real Time Clock I2CAL TIME CLK/CLNDR 8LD	Datasheet	2,869In Stock	Cut Tape $5.09 $3.88 $3.57 $3.23 Reel $3.12 View $3.02 $2.90 $2.84 Quote MouseReel Available	Min.: 1 Mult.: 1 : 250	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1208	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock I2CAL TIME CLK/CLNDR 8LD ISL1208IU8Z-TK Renesas / Intersil 1: $3.61 3,502In Stock 3,000Expected 7/8/2027	Mfr. Part # ISL1208IU8Z-TK Mouser Part # 968-ISL1208IU8Z-TK	Renesas / Intersil	Real Time Clock I2CAL TIME CLK/CLNDR 8LD	Datasheet	3,502In Stock 3,000Expected 7/8/2027	Cut Tape $3.61 $2.72 $2.50 $2.25 Reel $1.97 View $2.13 $2.07 $1.91 $1.88 MouseReel Available	Min.: 1 Mult.: 1 : 1,000	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-8	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1208	SMD/SMT			Reel, Cut Tape, MouseReel
Real Time Clock REAL TIME CLKRTC IN ISL1219IUZ Renesas / Intersil 1: $4.08 1,682In Stock	Mfr. Part # ISL1219IUZ Mouser Part # 968-ISL1219IUZ	Renesas / Intersil	Real Time Clock REAL TIME CLKRTC IN	Datasheet	1,682In Stock	$4.08 $3.08 $2.83 $2.64 View $2.50 $2.39 $2.23 $2.19	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	ISL1219	SMD/SMT			Tube
Real Time Clock REAL TIME CLKRTC IN ISL1219IUZ-T Renesas / Intersil 1: $4.06 1,830In Stock	Mfr. Part # ISL1219IUZ-T Mouser Part # 968-ISL1219IUZ-T	Renesas / Intersil	Real Time Clock REAL TIME CLKRTC IN	Datasheet	1,830In Stock	Cut Tape $4.06 $3.06 $2.81 $2.54 View Reel $2.24 $2.41 $2.39 $2.25 $2.24 MouseReel Available	Min.: 1 Mult.: 1 : 2,500	I2C	YY-MM-DD-dd	HH:MM:SS (24 hr)	MSOP-10	Backup Switching	2.7 V	5.5 V	- 40 C	+ 85 C	ISL1219	SMD/SMT			Reel, Cut Tape, MouseReel