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
M48T129V-85PM1 IC RTC CLOCK/CALENDAR PAR 32DIP STMicroelectronics	4,981	-	RFQ	Datasheet	Timekeeper®	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year, Watchdog Timer	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	3V ~ 3.6V	-	3mA @ 3V ~ 3.6V	0°C ~ 70°C	Through Hole	-	-	32-PMDIP Module
DS1251YP-70IND IC RTC PHANTOM CHIP PAR 34PCM Analog Devices Inc./Maxim Integrated	3,625	-	RFQ	Datasheet	-	34-PowerCap™ Module	Tube	Obsolete	Not Verified	Phantom Time Chip	Leap Year, NVSRAM	512kb	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	3V	10mA @ 5V	-40°C ~ 85°C	Surface Mount	-	-	34-PowerCap Module
DS1244W-120IND+ IC RTC PHANTOM CHIP PAR 28EDIP Analog Devices Inc./Maxim Integrated	2,183	-	RFQ	Datasheet	-	28-DIP Module (0.600", 15.24mm)	Tube	Active	Not Verified	Phantom Time Chip	Leap Year, NVSRAM	32KB	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	2.97V ~ 3.63V	-	7mA @ 3.3V	-40°C ~ 85°C	Through Hole	-	-	28-EDIP
M48T129Y-70PM1 IC RTC CLK/CALENDAR PAR 32DIP STMicroelectronics	3,040	-	RFQ	Datasheet	Timekeeper®	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm, Leap Year, Watchdog Timer	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	4mA @ 4.5V ~ 5.5V	0°C ~ 70°C	Through Hole	-	-	32-PMDIP
M48T251Y-70PM1 IC RTC PHANTOM CHIP PAR 32DIP STMicroelectronics	3,650	-	RFQ	Datasheet	Timekeeper®	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Phantom Time Chip	Leap Year	-	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	5mA @ 4.5V ~ 5.5V	0°C ~ 70°C	Through Hole	-	-	32-PMDIP
DS1251WP-120IND+ IC RTC PHANTOM CHIP PAR 34PCM Analog Devices Inc./Maxim Integrated	4,132	-	RFQ	Datasheet	-	34-PowerCap™ Module	Tube	Active	Not Verified	Phantom Time Chip	Leap Year, NVSRAM	512KB	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	2.97V ~ 3.63V	3V	7mA @ 3.3V	-40°C ~ 85°C	Surface Mount	-	-	34-PowerCap Module
DS1747WP-120 IC RTC CLK/CALENDAR PAR 34PCM Analog Devices Inc./Maxim Integrated	4,708	-	RFQ	Datasheet	-	34-PowerCap™ Module	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year, NVSRAM, Y2K	512KB	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	2.97V ~ 3.63V	3V	2mA @ 3.3V	0°C ~ 70°C	Surface Mount	-	-	34-PowerCap Module
M48T512V-85PM1 IC RTC CLOCK/CALENDAR PAR 32DIP STMicroelectronics	2,147	-	RFQ	Datasheet	Timekeeper®	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	3V ~ 3.6V	-	3mA @ 3V ~ 3.6V	0°C ~ 70°C	Through Hole	-	-	32-PMDIP Module
M48T512Y-70PM1 IC RTC CLOCK/CALENDAR PAR 32DIP STMicroelectronics	3,609	-	RFQ	Datasheet	Timekeeper®	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	4mA @ 4.5V ~ 5.5V	0°C ~ 70°C	Through Hole	-	-	32-PMDIP Module
DS1647-120 IC RTC CLK/CALENDAR PAR 32EDIP Analog Devices Inc./Maxim Integrated	2,608	-	RFQ	Datasheet	-	32-DIP Module (0.600", 15.24mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year, NVSRAM	512KB	HH:MM:SS (24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	4mA @ 4.5 V ~ 5.5 V	0°C ~ 70°C	Through Hole	-	-	32-EDIP
DS1254WB-C02 IC RTC PHANTOM CHIP PAR 80BGA Analog Devices Inc./Maxim Integrated	1,211	-	RFQ	Datasheet	-	80-BBGA	Tray	Obsolete	Not Verified	Phantom Time Chip	Leap Year, NVSRAM	2MB	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	3V ~ 3.7V	3V	-	-	Surface Mount	-	-	80-BGA (40x40)
M48T254V-10ZA1 IC RTC PHANTOM PAR 168BGA STMicroelectronics	1,233	-	RFQ	Datasheet	Timekeeper®	168-PBGA Module	Tube	Obsolete	Not Verified	Phantom Time Chip	Leap Year	-	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	3V ~ 3.6V	-	3mA @ 3V ~ 3.6V	0°C ~ 70°C	Surface Mount	-	-	168-PBGA Module (42.3x42.3)
DS1254WB-150 IC RTC PHANTOM CHIP PAR 168BGA Analog Devices Inc./Maxim Integrated	1,534	-	RFQ	Datasheet	-	168-BBGA Module	Bag	Obsolete	Not Verified	Phantom Time Chip	Leap Year, NVSRAM	2MB	HH:MM:SS:hh (12/24 hr)	YY-MM-DD-dd	Parallel	3V ~ 3.7V	3V	7mA @ 3.3V	0°C ~ 70°C	Surface Mount	-	-	168-BGA (40x40)
RTC-62421A IC RTC CLK/CALENDAR PAR 18DIP EPSON	2,969	-	RFQ	Datasheet	-	18-DIP (0.300", 7.62mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	1.8µA ~ 3µA @ 2V ~ 5V	-40°C ~ 85°C	Through Hole	-	-	18-DIP
RTC-72421A IC RTC CLK/CALENDAR PAR 18DIP EPSON	1,244	-	RFQ	Datasheet	-	18-DIP (0.300", 7.62mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-10°C ~ 70°C	Through Hole	-	-	18-DIP
RTC-72421B IC RTC CLK/CALENDAR PAR 18DIP EPSON	4,312	-	RFQ	Datasheet	-	18-DIP (0.300", 7.62mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-10°C ~ 70°C	Through Hole	-	-	18-DIP
RTC-72423A IC RTC CLK/CALENDAR PAR 24SOP EPSON	4,830	-	RFQ	Datasheet	-	24-SOIC (0.311", 7.90mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	24-SOP
RTC-72423B IC RTC CLK/CALENDAR PAR 24SOP EPSON	2,212	-	RFQ	Datasheet	-	24-SOIC (0.311", 7.90mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	5µA ~ 10µA @ 2V ~ 5V	-40°C ~ 85°C	Surface Mount	-	-	24-SOP
NJU6355ED IC RTC CLK/CALENDAR SER 8DIP Nisshinbo Micro Devices Inc.	3,573	-	RFQ	Datasheet	-	8-DIP (0.300", 7.62mm)	Tube	Obsolete	Not Verified	Clock/Calendar	Leap Year	-	HH:MM:SS (24 hr)	YY-MM-DD-dd	4-Wire Serial	4.5V ~ 5.5V	-	4µA ~ 15µA @ 2V ~ 5V	-30°C ~ 80°C	Through Hole	-	-	8-DIP
RTC-63423B IC RTC CLK/CALENDAR PAR 24SOP EPSON	2,228	-	RFQ	Datasheet	-	24-SOIC (0.311", 7.90mm Width)	Tube	Obsolete	Not Verified	Clock/Calendar	Alarm	-	HH:MM:SS (12/24 hr)	YY-MM-DD-dd	Parallel	4.5V ~ 5.5V	-	-	-40°C ~ 85°C	Surface Mount	-	-	24-SOP

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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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