Real Time Clocks

Manufacturer 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























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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Photo 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
PCF2127AT/1,518 NXP USA Inc.

PCF2127AT/1,518

IC RTC CLOCK/CALENDAR I2C 20SO

NXP USA Inc.

1,962
RFQ
PCF2127AT/1,518 Datasheet

Datasheet

- 20-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, TCXO/Crystal, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 4.2V 1.8V ~ 4.2V 1.5µA @ 3.3V -40°C ~ 85°C Surface Mount - - 20-SO
PCF8564ACX9/1,005 NXP USA Inc.

PCF8564ACX9/1,005

IC RTC CLOCK/CALENDAR I2C DIE

NXP USA Inc.

3,982
RFQ
PCF8564ACX9/1,005 Datasheet

Datasheet

- Die Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Watchdog Timer - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1V ~ 5.5V - 0.6µA ~ 0.75µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - Die
RX-4801JE:UB EPSON

RX-4801JE:UB

IC RTC CLK/CALENDAR SPI 20VSOJ

EPSON

1,028
RFQ
RX-4801JE:UB Datasheet

Datasheet

- 20-LSSOJ (0.213", 5.40mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year 16B HH:MM:SS (24 hr) YY-MM-DD-dd SPI 1.6V ~ 5.5V - 2.1µA ~ 3.4µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
PCF8523TS/1,112 NXP USA Inc.

PCF8523TS/1,112

IC RTC CLK/CALENDAR I2C 14TSSOP

NXP USA Inc.

4,191
RFQ
PCF8523TS/1,112 Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.6V ~ 5.5V 1.8V ~ 5.5V 0.5µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
ISL12027AIB27Z-T Renesas Electronics Corporation

ISL12027AIB27Z-T

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

4,874
RFQ
ISL12027AIB27Z-T Datasheet

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
ISL12027AIV27Z-T Renesas Electronics Corporation

ISL12027AIV27Z-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

2,795
RFQ
ISL12027AIV27Z-T Datasheet

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
ISL12028AIB27Z-T Renesas Electronics Corporation

ISL12028AIB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

2,355
RFQ
ISL12028AIB27Z-T Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12028AIV27Z-T Renesas Electronics Corporation

ISL12028AIV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

2,390
RFQ
ISL12028AIV27Z-T Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
ISL12029AIB27Z-T Renesas Electronics Corporation

ISL12029AIB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

3,886
RFQ
ISL12029AIB27Z-T Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12029AIV27Z-T Renesas Electronics Corporation

ISL12029AIV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

3,261
RFQ
ISL12029AIV27Z-T Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
ISL12027AIB27Z Renesas Electronics Corporation

ISL12027AIB27Z

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

3,647
RFQ
ISL12027AIB27Z Datasheet

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-SOIC
ISL12027AIV27Z Renesas Electronics Corporation

ISL12027AIV27Z

IC RTC CLK/CALENDAR I2C 8TSSOP

Renesas Electronics Corporation

3,453
RFQ
ISL12027AIV27Z Datasheet

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 8-TSSOP
ISL12028AIB27Z Renesas Electronics Corporation

ISL12028AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

1,326
RFQ
ISL12028AIB27Z Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12028AIV27Z Renesas Electronics Corporation

ISL12028AIV27Z

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

3,268
RFQ
ISL12028AIV27Z Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
ISL12029AIB27Z Renesas Electronics Corporation

ISL12029AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Renesas Electronics Corporation

3,366
RFQ
ISL12029AIB27Z Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-SOIC
ISL12029AIV27Z Renesas Electronics Corporation

ISL12029AIV27Z

IC RTC CLK/CALENDAR I2C 14TSSOP

Renesas Electronics Corporation

2,024
RFQ
ISL12029AIV27Z Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 14-TSSOP
RTC-7301DG:B ROHS EPSON

RTC-7301DG:B ROHS

IC RTC CLK/CALENDAR PAR 18DIP

EPSON

3,022
RFQ
RTC-7301DG:B ROHS Datasheet

Datasheet

- 18-DIP (0.300", 7.62mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.4V ~ 5.5V - 1µA ~ 2µA @ 3V ~ 5V -40°C ~ 85°C Through Hole - - 18-DIP
RX-8581JE:B3 I2C-BUS EPSON

RX-8581JE:B3 I2C-BUS

IC RTC CLK/CALENDAR I2C 20VSOJ

EPSON

4,037
RFQ
RX-8581JE:B3 I2C-BUS Datasheet

Datasheet

RX-8581JE 20-LSSOJ (0.213", 5.40mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 5.5V - 0.8µA ~ 1.2µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 20-VSOJ
DS1343D-18+ Analog Devices Inc./Maxim Integrated

DS1343D-18+

IC RTC CLK/CALENDAR SPI 14TDFN

Analog Devices Inc./Maxim Integrated

2,123
RFQ
DS1343D-18+ Datasheet

Datasheet

- 14-WFDFN Exposed Pad Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Trickle Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 1.71V ~ 5.5V 1.3V ~ 5.5V - -40°C ~ 85°C Surface Mount - - 14-TDFN (3x3)
DS1347T+ Analog Devices Inc./Maxim Integrated

DS1347T+

IC RTC CLK/CALENDAR SPI 8TDFN

Analog Devices Inc./Maxim Integrated

1,504
RFQ
DS1347T+ Datasheet

Datasheet

- 8-WDFN Exposed Pad Tube Active Not Verified Clock/Calendar Alarm, Leap Year, SRAM - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2V ~ 5.5V - 0.7µA ~ 0.8µA @ 2V ~ 5V -40°C ~ 85°C Surface Mount - - 8-TDFN (3x3)
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Real Time Clocks Electronic Components Sourcing and Lifecycle Support

FPGAX is a global sourcing partner specializing in FPGA and programmable logic solutions for engineering and manufacturing organizations worldwide. For customers sourcing Real Time Clocks components, we support both current production requirements and long-term component availability across demanding product lifecycles.

Our sourcing approach combines traceability, supply stability, and technical coordination. FPGAX is certified to AS9120B, ISO 9001:2008, and ISO 14001 standards and supports procurement programs where continuity, documentation, and dependable component supply are important.

How FPGAX Supports Real Time Clocks Requirements

  • Active component sourcing: support for current FPGA, programmable logic, and related semiconductor requirements.
  • End-of-life sourcing: assistance with obsolete and hard-to-find parts when designs must remain in production.
  • Lifecycle management: sourcing support during product transitions, allocation periods, and supply interruptions.
  • Design continuity: long-term supply support intended to reduce redesign pressure and production disruption.
  • Major programmable logic brands: sourcing coverage includes Xilinx, Intel/Altera, Lattice, Microchip, and QuickLogic.

Supply Support at a Glance

Requirement FPGAX Support
Current production Active FPGA, programmable logic, and semiconductor component sourcing
Legacy programs End-of-life and hard-to-find component sourcing
Supply continuity Lifecycle transition and long-term availability support
Quality requirements Traceable sourcing and quality-management processes

Focused on FPGA and Programmable Logic Supply

FPGAX focuses on helping customers maintain access to critical programmable devices throughout the full component lifecycle. Whether the requirement is for a current design, an established production program, or an older platform facing component obsolescence, our goal is to provide a stable sourcing path and help customers maintain design and manufacturing continuity.

Real Time Clocks FAQ

Can FPGAX source both active and end-of-life Real Time Clocks components?

Yes. FPGAX supports sourcing for both active components and end-of-life or hard-to-find parts, with an emphasis on maintaining supply continuity for engineering and manufacturing programs.

Which programmable logic manufacturers does FPGAX support?

Our core sourcing coverage includes major FPGA and programmable logic manufacturers such as Xilinx, Intel/Altera, Lattice, Microchip, and QuickLogic, subject to specific part requirements and availability.

How does FPGAX help with component lifecycle changes?

We support customers through lifecycle transitions by helping locate current or legacy supply, reducing exposure to supply disruptions, and supporting long-term availability for designs that need to remain in production.

What quality and traceability standards does FPGAX follow?

FPGAX states certification to AS9120B, ISO 9001:2008, and ISO 14001 standards. Our sourcing services are structured around traceability, stable supply, and quality-management requirements.

What information should I provide for a Real Time Clocks sourcing request?

Providing the manufacturer part number, required quantity, target delivery schedule, and any lifecycle or traceability requirements helps us evaluate the sourcing request more efficiently.