RTC I2C bus

  • Temperature compensated accuracy
  • AEC-Q200 compliant option
  • Compliant with I2C-Bus interface (400kHz)
  • Backup battery input (internal switchover)
  • Miniature ceramic package with castellations
Configurable Options
ParameterOption Code
Time accuracy
Operating temperature range
Quantity / Special Request

Please specify the quantity you require below.

The RV-3129-C3 is supplied on tape and reel. 1k or 3k pcs per reel are the standard T&R pack sizes for this product. Partial quantities may be supplied on tape (no reel), or in bulk.

Product Description

The miniature 3.2 x 2.5mm size of the RV-3129-C3 real time clock module allows more design room for the engineer, whilst offering a range of excellent specifications and additional functionality.

Smart temperature compensation means this component is suitable for a wide range of applications, including external metering, with excellent temperature stability options available over operating temperature ranges as wide as -40 to +125ºC. Built-in functions include standard clock, including second, minute, and hour in 24-hour format, and calendar functions with year tracking and leap-year flagging. The I2C bus interface RV-3129-C3 also includes backup battery input with internal switch over function, programmable trickle-charge circuitry, integrated temperature sensor with digital output, and 8 bytes of RAM and 2 bytes of EEPROM.

Frequencies (selectable) 32.768kHz, 1024Hz, 32Hz, 1Hz
Dimensions 3.7 x 2.5 x 0.9mm
Frequency tolerance @ 25°C ±10ppm typ, ±20ppm max
Time accuracy (option A) ±3ppm max (0.26s/day), 25°C
±4ppm max (0.35s/day), -0+50°C
±5ppm max (0.43s/day), -10+60°C
±6ppm max (0.52s/day), -40+85°C
±8ppm max (0.69s/day), -40+125°C
Time accuracy (option B) ±3ppm max (0.26s/day), 25°C
±5ppm max (0.43s/day), -0+50°C
±10ppm max (0.86s/day), -10+60°C
±25ppm max (2.16s/day), -40+85°C
±30ppm max (2.59s/day), -40+125°C
Storage temperature range -55 to +125°C
Ageing ±3.0ppm max first year
Supply voltage (VDD) Ditigally temperature compensated 2.1 ~ 5.5V
I2C bus active 1.8 ~ 5.5V
Time-keeping mode 1.3 ~ 5.5V
Supply current (VDD=3.0V) 0.80µA typ, 1.0µA max
Shock and vibration resistance ±5ppm, 5,000g, 0.3ms, ½ sine
±5ppm, 20g, 10.0 ~ 2,000Hz
Soldering condition Reflow, 260°C, 20 sec max
Package Drawing
Ordering Information

To request a quotation for the RV-3129-C3 please use the configurable options form to choose the options you require and then submit your configured product to our team. Our expert advisers are always happy to help with your requirements and can be contacted on +44 1460 256 100 or at sales@golledge.com.

Following product selection you will be issued with a seven character Golledge part number. Your Golledge part number is the internationally accepted Golledge manufacturing part number (MPN) that should be used for all project documentation, including bills of materials (BoMs) and purchase orders.

If you have any queries regarding any of our documentation our dedicated sales team will be happy to help.

Technical Resources

The RV-3129-C3 real time clock is a versatile component suitable for a wide range of applications and uses including:

  • Automotive including car radio, GPS and other tracking systems, dashboard devices, tachometers, entertainment systems, and engine control 
  • Industrial and consumer electronics
  • Metering including E-meter and heating counters
  • Portable devices
  • White goods
Tape & Reel Specification
Tape and Reel specifications

A:178 / B:12 / C:4 / D:2.7 / E:4 / F:1 / G:61.5 / H:21

Handling & Storage

ESD-HBM-1A Human Body Model (HBM) 1A (250V to <500V)

MSL1 Moisture Sensitivity Level (MSL): 1 (or not applicable)


Ceramic package with metal lid


PbFree Lead-free (< 0.1% by weight )

RoHS compliant with no exemptions RoHS compliant with no exemptions. See our declaration

REACH REACH compliant. See our statement

Conflict Minerals Statement Free of conflict minerals. See our declaration

Halogen Free Statement Free of Halogens. See our declaration

Ozone Depletion Statement Free of Ozone-depleting substances. See our declaration

Supply Partner
Supply Partner

The RV-3129-C3 is manufactured by Micro Crystal and stocked and supplied by Golledge.


Real Time Clock Modules - Quick Comparison Tools

Compare RTC specifications and extra features quickly and easily


Our comparison charts for both I2C and SPI-bus interface RTC modules means you can easily compare product specifications and extra features at a glance.