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
RV-3129-C3-32.768KHZ-OPTION-B-TB-QA Micro Crystal AG

RV-3129-C3-32.768KHZ-OPTION-B-TB-QA

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

19,922
RFQ
RV-3129-C3-32.768KHZ-OPTION-B-TB-QA Datasheet

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 125°C (TA) Surface Mount Automotive AEC-Q200 10-SON (3.7x2.5)
ISL12057IUZ-T Renesas Electronics Corporation

ISL12057IUZ-T

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

1,571
RFQ
ISL12057IUZ-T Datasheet

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 3.6V - 0.65µA @ 1.8V -40°C ~ 85°C Surface Mount - - 8-MSOP
ISL12057IUZ Renesas Electronics Corporation

ISL12057IUZ

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

1,201
RFQ
ISL12057IUZ Datasheet

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tube Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.8V ~ 3.6V - 0.65µA @ 1.8V -40°C ~ 85°C Surface Mount - - 8-MSOP
ISL1208IB8Z-TK Renesas Electronics Corporation

ISL1208IB8Z-TK

IC RTC CLK/CALENDAR I2C 8SOIC

Renesas Electronics Corporation

10,275
RFQ
ISL1208IB8Z-TK Datasheet

Datasheet

- 8-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar 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 - - 8-SOIC
RV-3028-C7 32.768KHZ 1PPM-TA-QC Micro Crystal AG

RV-3028-C7 32.768KHZ 1PPM-TA-QC

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

29,131
RFQ
RV-3028-C7 32.768KHZ 1PPM-TA-QC Datasheet

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger 2B, 43B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.1V ~ 5.5V 1.1V ~ 5.5V 0.06µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 8-SON (3.2x1.5)
R2025S-E2-FE Nisshinbo Micro Devices Inc.

R2025S-E2-FE

IC RTC CLK/CALENDAR I2C 14SOP

Nisshinbo Micro Devices Inc.

6,632
RFQ
R2025S-E2-FE Datasheet

Datasheet

- 14-SOIC (0.197", 5.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.7V ~ 5.5V - 120µA ~ 1.8µA @ 3V ~ 5V -40°C ~ 85°C Surface Mount - - 14-SOP
PCA2131TF/Q900Y NXP USA Inc.

PCA2131TF/Q900Y

IC RTC W/XTAL AUTO HLSON16

NXP USA Inc.

1,246
RFQ
PCA2131TF/Q900Y Datasheet

Datasheet

- - Tape & Reel (TR) Active Not Verified - - - - - - - - - - - - - -
RV-3028-C7 32.768KHZ 1PPM-TA-QA Micro Crystal AG

RV-3028-C7 32.768KHZ 1PPM-TA-QA

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

84,366
RFQ
RV-3028-C7 32.768KHZ 1PPM-TA-QA Datasheet

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, EEPROM, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer, Trickle Charger 2B, 43B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.1V ~ 5.5V 1.1V ~ 5.5V 0.06µA @ 3V -40°C ~ 85°C (TA) Surface Mount Automotive AEC-Q200 8-SON (3.2x1.5)
RV-2123-C2-32.768KHZ-20PPM-TA-QC Micro Crystal AG

RV-2123-C2-32.768KHZ-20PPM-TA-QC

IC RTC CLK/CALENDAR SPI 10SON

Micro Crystal AG

39,417
RFQ
RV-2123-C2-32.768KHZ-20PPM-TA-QC Datasheet

Datasheet

C2 10-TDFN Exposed Pad Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Programmable Clock Output, Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 4-Wire Serial 1.1V ~ 5.5V - 0.18µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (5x3.2)
M41T94MQ6F STMicroelectronics

M41T94MQ6F

IC RTC CLK/CALENDAR SPI 16SO

STMicroelectronics

5,978
RFQ
M41T94MQ6F Datasheet

Datasheet

- 16-SOIC (0.154", 3.90mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, NVRAM, Square Wave Output, Watchdog Timer 44B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 2.5V ~ 3.5V 1.4mA @ 2.7V ~ 5.5V -40°C ~ 85°C Surface Mount - - 16-SO
RV-8803-C7-32.768KHZ-3PPM-TA-QC Micro Crystal AG

RV-8803-C7-32.768KHZ-3PPM-TA-QC

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

9,374
RFQ
RV-8803-C7-32.768KHZ-3PPM-TA-QC Datasheet

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer 1B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.5V ~ 5.5V - 0.35µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 8-SON (3.2x1.5)
ISL1208IU8Z-TK Renesas Electronics Corporation

ISL1208IU8Z-TK

IC RTC CLK/CALENDAR I2C 8MSOP

Renesas Electronics Corporation

4,628
RFQ
ISL1208IU8Z-TK Datasheet

Datasheet

- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar 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 - - 8-MSOP
RV-8803-C7-32.768KHZ-3PPM-TA-QA Micro Crystal AG

RV-8803-C7-32.768KHZ-3PPM-TA-QA

IC RTC CLK/CALENDAR I2C 8SON

Micro Crystal AG

19,258
RFQ
RV-8803-C7-32.768KHZ-3PPM-TA-QA Datasheet

Datasheet

C7 8-WCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, External Event Interrupt, Leap Year, Programmable Clock Output, RAM, Timer 1B HH:MM:SS (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.5V ~ 5.5V - 0.35µA @ 3V -40°C ~ 85°C (TA) Surface Mount Automotive AEC-Q200 8-SON (3.2x1.5)
M41T93RMY6F STMicroelectronics

M41T93RMY6F

IC RTC CLK/CALENDAR SPI 18SOX

STMicroelectronics

8,712
RFQ
M41T93RMY6F Datasheet

Datasheet

- 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd SPI 2.7V ~ 5.5V 1.8V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
M41T83ZMY6F STMicroelectronics

M41T83ZMY6F

IC RTC CLK/CALENDAR I2C 18SOX

STMicroelectronics

885
RFQ
M41T83ZMY6F Datasheet

Datasheet

- 18-SOX, 18-SOIC with Crystal (7.5mm Width) Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Leap Year, Square Wave Output, SRAM, Watchdog Timer 7B HH:MM:SS:hh (24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 2.38V ~ 5.5V 2V ~ 5.5V 10µA @ 5.5V -40°C ~ 85°C Surface Mount - - 18-SOX
PCF2127T/2Y NXP USA Inc.

PCF2127T/2Y

IC RTC CLOCK/CALENDAR I2C 16SO

NXP USA Inc.

1,052
RFQ
PCF2127T/2Y Datasheet

Datasheet

- 16-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active 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 - - 16-SO
RV-3129-C3-32.768KHZ-OPTION-B-TA-QC Micro Crystal AG

RV-3129-C3-32.768KHZ-OPTION-B-TA-QC

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

13,432
RFQ
RV-3129-C3-32.768KHZ-OPTION-B-TA-QC Datasheet

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
PCF2127AT/2Y NXP USA Inc.

PCF2127AT/2Y

IC RTC CLOCK/CALENDAR I2C 20SO

NXP USA Inc.

5,658
RFQ
PCF2127AT/2Y Datasheet

Datasheet

- 20-SOIC (0.295", 7.50mm Width) Tape & Reel (TR) Active 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
RV-3149-C3-32.768KHZ-OPTION-B-TA-QC Micro Crystal AG

RV-3149-C3-32.768KHZ-OPTION-B-TA-QC

IC RTC CLK/CALENDAR SPI 10SON

Micro Crystal AG

4,648
RFQ
RV-3149-C3-32.768KHZ-OPTION-B-TA-QC Datasheet

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, EEPROM, Leap Year, Programmable Clock Output, RAM, Temperature, Timer, Trickle Charger 2B, 8B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI, 4-Wire Serial 1.3V ~ 5.5V - 1µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
RV-8523-C3-32.768KHZ-20PPM-TA-QC Micro Crystal AG

RV-8523-C3-32.768KHZ-20PPM-TA-QC

IC RTC CLK/CALENDAR I2C 10SON

Micro Crystal AG

8,898
RFQ
RV-8523-C3-32.768KHZ-20PPM-TA-QC Datasheet

Datasheet

C3 10-VCDFN Tape & Reel (TR) Active Not Verified Clock/Calendar Alarm, Battery Switch, Leap Year, Programmable Clock Output, Timer, Watchdog Timer - HH:MM:SS (12/24 hr) YY-MM-DD-dd I2C, 2-Wire Serial 1.2V ~ 5.5V - 0.18µA @ 3V -40°C ~ 85°C (TA) Surface Mount - - 10-SON (3.7x2.5)
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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.