Real Time Clocks

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Mfr. Part #	Availability	Price	Quantity	Datasheet	Series	Package/Case	Packaging	Product Status	Programmable	Type	Features	Memory Size	Time Format	Date Format	Interface	Voltage - Supply	Voltage - Supply, Battery	Current - Timekeeping (Max)	Operating Temperature	Mounting Type	Grade	Qualification	Supplier Device Package
PT7C4302ZEE IC RTC CLK/CALENDAR SER 8TDFN Diodes Incorporated	3,697	-	RFQ	Datasheet	-	8-WFDFN Exposed Pad	Bulk	Obsolete	Not Verified	Clock/Calendar	Leap Year, NVSRAM, Square Wave Output, Trickle-Charger	31B	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	3-Wire Serial	1.2V ~ 5.5V	1.5V ~ 5.5V	25.3µA ~ 81µA @ 2V ~ 5V	-40°C ~ 85°C (TA)	Surface Mount	-	-	8-TDFN (2x3)
PT7C4372AZEE IC RTC CLK/CALENDAR I2C 8TDFN Diodes Incorporated	3,763	-	RFQ	Datasheet	-	8-WFDFN Exposed Pad	Bulk	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.8V ~ 6V	-	0.8µA @ 3V	-40°C ~ 85°C (TA)	Surface Mount	-	-	8-TDFN (2x3)
PT7C4563ZEE IC RTC CLK/CALENDAR I2C 8TDFN Diodes Incorporated	2,723	-	RFQ	Datasheet	-	8-WFDFN Exposed Pad	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year, Square Wave Output	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	I2C, 2-Wire Serial	1.3V ~ 5.5V	-	0.65µA ~ 0.85µA @ 3V ~ 5V	-40°C ~ 85°C (TA)	Surface Mount	-	-	8-TDFN (2x3)
RA-4574SA:B PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	1,326	-	RFQ	Datasheet	RA-4574SA	14-SOIC (0.197", 5.00mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RA-4574SA:B0 PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	1,461	-	RFQ	Datasheet	RA-4574SA	14-SOIC (0.197", 5.00mm Width)	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RA-8565SA:B PURE SN IC RTC CLK/CALENDAR I2C 14SOP EPSON	2,328	-	RFQ	Datasheet	RA-8565SA	14-SOIC (0.197", 5.00mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm	-	HH:MM:SS	YY-MM-DD-dd	I2C	1.8V ~ 5.5V	-	1µA ~ 1.8µA @ 3V ~ 5V	-40°C ~ 125°C	Surface Mount	-	-	14-SOP
RA-8565SA:B0 PURE SN IC RTC CLK/CALENDAR I2C 14SOP EPSON	2,258	-	RFQ	Datasheet	RA-8565SA	14-SOIC (0.197", 5.00mm Width)	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Alarm	-	HH:MM:SS	YY-MM-DD-dd	I2C	1.8V ~ 5.5V	-	1µA ~ 1.8µA @ 3V ~ 5V	-40°C ~ 125°C	Surface Mount	-	-	14-SOP
RA-8565SA:B3 PURE SN IC RTC CLK/CALENDAR I2C 14SOP EPSON	3,304	-	RFQ	Datasheet	RA-8565SA	14-SOIC (0.197", 5.00mm Width)	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Alarm	-	HH:MM:SS	YY-MM-DD-dd	I2C	1.8V ~ 5.5V	-	1µA ~ 1.8µA @ 3V ~ 5V	-40°C ~ 125°C	Surface Mount	-	-	14-SOP
RTC-4543SA:A ROHS IC RTC CLK/CALENDAR SER 14SOP EPSON	4,749	-	RFQ	Datasheet	RTC-4543SA	14-SOIC (0.197", 5.00mm Width)	Bulk	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	3-Wire Serial	2.5V ~ 5.5V	-	1µA ~ 3µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4543SA:B:PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	4,835	-	RFQ	Datasheet	RTC-4543SA	14-SOIC (0.197", 5.00mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	3-Wire Serial	2.5V ~ 5.5V	-	1µA ~ 3µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4543SA:B ROHS IC RTC CLK/CALENDAR SER 14SOP EPSON	4,926	-	RFQ	Datasheet	RTC-4543SA	14-SOIC (0.197", 5.00mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	3-Wire Serial	2.5V ~ 5.5V	-	1µA ~ 3µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4543SA:B3:PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	1,124	-	RFQ	Datasheet	RTC-4543SA	14-SOIC (0.197", 5.00mm Width)	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	3-Wire Serial	2.5V ~ 5.5V	-	1µA ~ 3µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4574JE:B ROHS IC RTC CLK/CALENDAR SER 20VSOJ EPSON	1,846	-	RFQ	Datasheet	RTC-4574JE	20-LSSOJ (0.213", 5.40mm Width)	Strip	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	20-VSOJ
RTC-4574NB:B ROHS IC RTC CLK/CALENDAR SER 22SON EPSON	4,858	-	RFQ	Datasheet	-	22-LFDFN	Strip	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	22-SON (6.3x4.8)
RTC-4574SA:B:PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	1,751	-	RFQ	Datasheet	RTC-4574SA	14-SOIC (0.197", 5.00mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4574SA:B3:PURE SN IC RTC CLK/CALENDAR SER 14SOP EPSON	1,182	-	RFQ	Datasheet	RTC-4574SA	14-SOIC (0.197", 5.00mm Width)	Tape & Reel (TR)	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	1µA ~ 2µA @ 3V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	14-SOP
RTC-4701JE:B ROHS IC RTC CLK/CALENDAR SER 20VSOJ EPSON	3,659	-	RFQ	Datasheet	-	20-LSSOJ (0.213", 5.40mm Width)	Strip	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	-	-40°C ~ 85°C	Surface Mount	-	-	20-VSOJ
RTC-4701NB:B ROHS IC RTC CLK/CALENDAR SER 22SON EPSON	1,751	-	RFQ	Datasheet	-	22-LFDFN	Strip	Obsolete	Not Verified	Clock/Calendar	Alarm	-	-	-	3-Wire Serial	1.6V ~ 5.5V	-	-	-40°C ~ 85°C	Surface Mount	-	-	22-SON (6.3x4.8)
RTC-72421A: PURE SN IC RTC CLK/CALENDAR PAR 18DIP EPSON	4,775	-	RFQ	Datasheet	RTC-72421	18-DIP (0.300", 7.62mm)	Bulk	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	-	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-10°C ~ 70°C	Through Hole	-	-	18-DIP
RTC-72421B: PURE SN IC RTC CLK/CALENDAR PAR 18DIP EPSON	1,622	-	RFQ	Datasheet	RTC-72421	18-DIP (0.300", 7.62mm)	Bulk	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	-	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-10°C ~ 70°C	Through Hole	-	-	18-DIP

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Real Time Clocks FAQ

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What should I check when selecting Real Time Clocks components?

Compare the manufacturer part number, electrical specifications, package, operating conditions and application requirements. The product datasheet should be used to confirm technical suitability.

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Yes. Send the exact part number, manufacturer and required quantity. Winsun (HK) Electronics can assist with availability checks, quotation support and sourcing options based on your requirement.

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Yes. Our sourcing team can review shortage and obsolete-part requirements and help check available supply channels or possible alternatives when appropriate.

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