RX8901CE/4901CE Real-Time Clock Modules

Epson Timing RX8901CE/4901CE Real-Time Clock Modules (RTCs) feature an I2C or 3- or 4-wire SPI interface and are high-precision components with low power consumption and an integrated event system with up to 3 event inputs. This event system can detect events and record the timestamp while the microcontroller remains in sleep mode, reducing system power consumption for longer battery life. Epson RX8901CE modules can record timestamps for 32 events in either FIFO or direct mode. These RTCs consume 240nA from a 3V supply and feature a built-in power supply switching circuit. The modules offer time resolution down to 1/512th of a second and are highly stable across the devices' entire operating temperature range.

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Qty. RoHS ECAD Model RTC Bus Interface
Date Format
Time Format
RTC Memory Size
Battery Backup Switching
Supply Voltage - Min
Supply Voltage - Max
Minimum Operating Temperature
Maximum Operating Temperature
Series
Mounting Style
Packaging
Epson Timing Real Time Clock RX8901CE XB B0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-5ppm 2k TR
Datasheet
1,086In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) No Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX8901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XS C0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR
Datasheet
1,516In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XB D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR
Datasheet
972In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XB B0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR
Datasheet
2,000In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XS B0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR
Datasheet
1,860In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CEXS A0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR
Datasheet
1,988In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX8901CE XS A0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR
Datasheet
700In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) No Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX8901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XS D0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-3ppm 2k TR
Datasheet
1,922In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX8901CE XS B0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-3ppm 2k TR
Datasheet
373In Stock
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) No Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX8901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XB C0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR
Datasheet
1,867Expected 11/08/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX8901CE:XB A0 REAL TIME CLOCK MODULE I2C-Bus 3.0V +/-5ppm 2k TR
Datasheet
3,995Expected 12/05/2026
MouseReel Available
Min.: 1
Mult.: 1
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX8901CE SMD/SMT Reel, Cut Tape, MouseReel
Epson Timing Real Time Clock RX4901CE XB A0 REAL TIME CLOCK MODULE SPI-Bus 3.0V +/-5ppm 2k TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 2,000
Mult.: 2,000
: 2,000

I2C YY-MM-DD-dd HH:MM:SS (24 hr) 256 B Backup Switching 1.6 V 5.5 V - 40 C + 105 C RX4901CE SMD/SMT Reel
Epson Timing RX4901CE XB A00
Epson Timing Real Time Clock RX4901CE XB A00 REAL TIME CLOCK 3 WIRE SPI-BUS +/-5PPM -40 85C PIN 4FOUT 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XB A03
Epson Timing Real Time Clock RX4901CE XB A03 REAL TIME CLOCK 3 WIRE SPI-BUS +/-5PPM -40 85C PIN 4FOUT 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel
Epson Timing RX4901CE XB B00
Epson Timing Real Time Clock RX4901CE XB B00 REAL TIME CLOCK 3 WIRE SPI-BUS +/-5PPM -40 85C PIN 4EVIN3 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XB B03
Epson Timing Real Time Clock RX4901CE XB B03 REAL TIME CLOCK 3 WIRE SPI-BUS +/-5PPM -40 85C PIN 4EVIN3 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel
Epson Timing RX4901CE XB C00
Epson Timing Real Time Clock RX4901CE XB C00 REAL TIME CLOCK 4 WIRE SPI-BUS +/-5PPM -40 85C PIN 4FOUT 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XB C03
Epson Timing Real Time Clock RX4901CE XB C03 REAL TIME CLOCK 4 WIRE SPI-BUS +/-5PPM -40 85C PIN 4FOUT 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel
Epson Timing RX4901CE XB D00
Epson Timing Real Time Clock RX4901CE XB D00 REAL TIME CLOCK 4 WIRE SPI-BUS +/-5PPM -40 85C PIN 4EVIN3 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XB D03
Epson Timing Real Time Clock RX4901CE XB D03 REAL TIME CLOCK 4 WIRE SPI-BUS +/-5PPM -40 85C PIN 4EVIN3 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel
Epson Timing RX4901CE XS A00
Epson Timing Real Time Clock RX4901CE XS A00 REAL TIME CLOCK 3 WIRE SPI-BUS +/-3PPM -40 85C PIN 4FOUT 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XS A03
Epson Timing Real Time Clock RX4901CE XS A03 REAL TIME CLOCK 3 WIRE SPI-BUS +/-3PPM -40 85C PIN 4FOUT 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel
Epson Timing RX4901CE XS A0B
Epson Timing Real Time Clock RX4901CE XS A0B REAL TIME CLOCK 3 WIRE SPI-BUS +/-3PPM -40 85C PIN 4FOUT BULK
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1
Mult.: 1
RX4901CE Bulk
Epson Timing RX4901CE XS B00
Epson Timing Real Time Clock RX4901CE XS B00 REAL TIME CLOCK 3 WIRE SPI-BUS +/-3PPM -40 85C PIN4EVIN3 1K TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 1,000
Mult.: 1,000
: 1,000
RX4901CE Reel
Epson Timing RX4901CE XS B03
Epson Timing Real Time Clock RX4901CE XS B03 REAL TIME CLOCK 3 WIRE SPI-BUS +/-3PPM -40 85C PIN4EVIN3 250TR
Datasheet
Non-Stocked Lead-Time 16 Weeks
Min.: 250
Mult.: 250
: 250
RX4901CE Reel