RX-8571LC
Real-time clock module by Epson
The RX-8571LC 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 LC · VSOJ-12, 3.6 × 2.8 mm, standby current 220 nA typ., accuracy ±23 ppm @ +25 °C, operating range −40 … +85 °C.
What the RX-8571LC can do
The tolerance figure applies at +25 °C. Over temperature the built-in crystal follows the usual parabola.
Alternatives in the Epson programme
If the RX-8571LC is not quite the right fit — these types come closest:
RX-4571LC
Same series, SPI instead of I²C. Otherwise largely identical figures.
RX-8571SA
The same series in the SA · SOP-14 package. 200 nA typ. · −40 … +85 °C
RX-8571NB
The same series in the NB · SON-22 package. on request · −40 … +85 °C
RX8901CE
If the clock has to hold over temperature as well: DTCXO, ±3.0 ppm over −40 … +85 °C (DTCXO).
All 40 families with filters for interface, package, standby current and temperature: real-time clock finder.
Frequently asked questions about the RX-8571LC
How accurate is the RX-8571LC?
±23 ppm @ +25 °C. 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 RX-8571LC draw in backup?
220 nA typ.. 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 RX-8571LC use?
I²C. Package: LC · VSOJ-12, 3.6 × 2.8 mm.
Where can I buy the RX-8571LC 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 RX-8571LC.
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.