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
ISL12027IB27AZ Intersil

ISL12027IB27AZ

IC RTC CLK/CALENDAR I2C 8SOIC

Intersil

2,965
RFQ
ISL12027IB27AZ 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
ISL12029IB27Z-T Intersil

ISL12029IB27Z-T

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

2,290
RFQ
ISL12029IB27Z-T Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Bulk 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
ISL12028IB27Z Intersil

ISL12028IB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Intersil

1,956
RFQ
ISL12028IB27Z 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
ISL12027IB30AZ Intersil

ISL12027IB30AZ

IC RTC CLK/CALENDAR I2C 8SOIC

Intersil

1,585
RFQ
ISL12027IB30AZ 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
ISL12028IV27Z-T Intersil

ISL12028IV27Z-T

IC RTC CLK/CALENDAR I2C 14TSSOP

Intersil

1,427
RFQ
ISL12028IV27Z-T Datasheet

Datasheet

- 14-TSSOP (0.173", 4.40mm Width) Bulk 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
ISL12027IVZ-T Intersil

ISL12027IVZ-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Intersil

1,265
RFQ
ISL12027IVZ-T Datasheet

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Bulk 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
ISL12029IB27Z Elantec

ISL12029IB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Elantec

1,000
RFQ
ISL12029IB27Z 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
ISL12029AIB27Z Elantec

ISL12029AIB27Z

IC RTC CLK/CALENDAR I2C 14SOIC

Elantec

1,000
RFQ
ISL12029AIB27Z Datasheet

Datasheet

- 14-SOIC (0.154", 3.90mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Supervisor, Watchdog Timer 512B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA ~ 20µA @ 2.7V ~ 5.5V -40°C ~ 85°C (TA) Surface Mount - - 14-SOIC
ISL12027IV27AZ-T Intersil

ISL12027IV27AZ-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Intersil

892
RFQ
ISL12027IV27AZ-T Datasheet

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Bulk 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
DS1339C-2 Analog Devices Inc./Maxim Integrated

DS1339C-2

DS1339 I2C SERIAL RTC

Analog Devices Inc./Maxim Integrated

1,479
RFQ
DS1339C-2 Datasheet

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, Trickle-Charger - HH:MM:SS (12/24 hr) YY-MM-DD I2C 1.8V ~ 5.5V 1.3V ~ 3.7V 100µA @ 2.2V -40°C ~ 85°C (TA) Surface Mount - - 16-SOIC
BQ4845S-A4NTR Texas Instruments

BQ4845S-A4NTR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

3,509
RFQ
BQ4845S-A4NTR Datasheet

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.75V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V -40°C ~ 85°C Surface Mount - - 28-SOIC
BQ4845YS-A4NTR Texas Instruments

BQ4845YS-A4NTR

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

4,375
RFQ
BQ4845YS-A4NTR Datasheet

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V -40°C ~ 85°C Surface Mount - - 28-SOIC
DS1685E-3/TR Analog Devices Inc./Maxim Integrated

DS1685E-3/TR

DS1685 5V REAL-TIME CLOCK

Analog Devices Inc./Maxim Integrated

1,246
RFQ
DS1685E-3/TR Datasheet

Datasheet

- 24-TSSOP (0.173", 4.40mm Width) Bulk Active Not Verified Clock/Calendar Alarm, Daylight Savings, NVRAM, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V 0°C ~ 70°C (TA) Surface Mount - - 24-TSSOP
SLR32CN-32.768K Suntsu Electronics, Inc

SLR32CN-32.768K

IC RTC CLK/CALENDAR I2C 10SMD

Suntsu Electronics, Inc

314
RFQ
SLR32CN-32.768K Datasheet

Datasheet

- 10-SMD, No Lead Bulk Active Not Verified Clock/Calendar Alarm, Leap Year, RAM - HH:MM:SS YY-MM-DD I2C 2.5V ~ 5V 1.6V ~ 5V 500nA @ 3V -40°C ~ 85°C Surface Mount - - 10-SMD
DS1302SN-16/TR Analog Devices Inc./Maxim Integrated

DS1302SN-16/TR

TRICKLE-CHARGE TIMEKEEPING CHIP

Analog Devices Inc./Maxim Integrated

2,750
RFQ
DS1302SN-16/TR Datasheet

Datasheet

- 8-SOIC (0.209", 5.30mm Width) Bulk Active Not Verified Clock/Calendar Leap Year, NVSRAM, RAM, Trickle-Charger 31B HH:MM:SS (12/24 hr) YY-MM-DD-dd 3-Wire Serial 2V ~ 5.5V 2V ~ 5.5V 0.3µA ~ 1µA @ 2V ~ 5V -40°C ~ 85°C (TA) Surface Mount - - 8-SOIC
BQ4845S-A4 Texas Instruments

BQ4845S-A4

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

2,350
RFQ
BQ4845S-A4 Datasheet

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.75V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
BQ4845YS-A4 Texas Instruments

BQ4845YS-A4

IC RTC CLK/CALENDAR PAR 28SOIC

Texas Instruments

1,627
RFQ
BQ4845YS-A4 Datasheet

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.3V ~ 4V 1.5mA (Typ) @ 4.5 V ~ 5.5 V 0°C ~ 70°C Surface Mount - - 28-SOIC
DS1685Q-3 Analog Devices Inc./Maxim Integrated

DS1685Q-3

IC RTC CLK/CALENDAR PAR 28PLCC

Analog Devices Inc./Maxim Integrated

4,083
RFQ
DS1685Q-3 Datasheet

Datasheet

- 28-LCC (J-Lead) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V 0°C ~ 70°C Surface Mount - - 28-PLCC (11.51x11.51)
ISL1209IU10Z-TK Renesas Electronics Corporation

ISL1209IU10Z-TK

IC RTC EVENT REC I2C 10MSOP

Renesas Electronics Corporation

998
RFQ
ISL1209IU10Z-TK Datasheet

Datasheet

- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Time Event Recorder Alarm, Leap Year, SRAM 2B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.7V ~ 5.5V 1.8V ~ 5.5V 4µA ~ 6µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 10-MSOP
ISL12025IVZ-T Intersil

ISL12025IVZ-T

IC RTC CLK/CALENDAR I2C 8TSSOP

Intersil

11,777
RFQ
ISL12025IVZ-T Datasheet

Datasheet

- 8-TSSOP (0.173", 4.40mm Width) Bulk Obsolete Not Verified Clock/Calendar Alarm, Leap Year, Supervisor, Unique ID, 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
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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.