RX8130CE
Real-time clock module by Epson
The RX8130CE is a real-time clock module from Epson with a built-in 32.768 kHz crystal — no separate watch crystal on the board, no load capacitance and layout risk. Interface I²C, package CE · 3.2 × 2.5 × 1.0 mm, standby current 300 nA typ. · 500 nA max., accuracy +5 ±23 ppm at +25 °C (not compensated), operating range −40 … +85 °C. Reset output with delay, charge control with full-charge detection, V_IO pin. Successor to the JE/NB types.
What the RX8130CE can do
The tolerance figure applies at +25 °C. Over temperature the built-in crystal follows the usual parabola.
Detects the loss of the main supply and switches to the backup source on its own — compared with a diode-OR arrangement the MOS switch saves leakage current and voltage drop.
Issues a reset signal with an adjustable delay and replaces an external reset IC.
A separate level for the interface: the device runs on 3 V but talks to a 1.8 V MCU without a level shifter.
Reports an oscillation stop instead of quietly delivering the wrong time.
RX8130CE as a successor type
In discontinuation notice 25-012E dated 28 October 2025 Epson names the RX8130CE as the successor for the following end-of-life types. Their final shipment goes out at the end of October 2026.
Alternatives in the Epson programme
If the RX8130CE is not quite the right fit — these types come closest:
All 40 families with filters for interface, package, standby current and temperature: real-time clock finder.
Frequently asked questions about the RX8130CE
How accurate is the RX8130CE?
+5 ±23 ppm at +25 °C (not compensated). This figure applies at +25 degrees Celsius. Over temperature the built-in crystal follows the usual parabola — if the clock has to hold when hot and cold as well, a DTCXO type is the right choice.
How much current does the RX8130CE draw in backup?
300 nA typ. · 500 nA max.. With a 225 mAh coin cell that is enough for many years of pure timekeeping on paper; the self-discharge of the cell usually becomes the limiting factor.
Which interface does the RX8130CE use?
I²C. Package: CE · 3.2 × 2.5 × 1.0 mm.
Where can I buy the RX8130CE in Europe?
Timing Devices Europe stocks the Epson RTC programme in its own warehouse in Ladenburg near Heidelberg, Germany — physically on site, not at the manufacturer. Samples, series demand and second-source assessment in one go, answered the same working day.
Enquire about the RX8130CE.
We stock the Epson RTC programme in our own warehouse in Ladenburg near Heidelberg, Germany. Tell us tolerance grade, packing, quantity and date — answered the same working day.