RX-4803SA
Real-time clock module by Epson
The RX-4803SA 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 SPI, package SA · SOP-14, standby current 750 nA typ., accuracy ±3.4 ppm over Temp (DTCXO), operating range −40 … +85 °C. SPI counterpart to the RX-8803SA, EVIN for 1 pps synchronisation.
What the RX-4803SA can do
Digitally temperature compensated — the stated accuracy holds across the whole temperature range, not only at +25 °C.
Order codes and datasheets
Every order code has its own printable datasheet with all recorded figures.
| TDE item | Epson designation |
|---|---|
| 91-0033 | RX-4803SA UB |
| 91-0100 | RX-4803SA UB |
| 91-0101 | RX-4803SA UB |
| 91-0102 | RX-4803SA UB |
| 91-0103 | RX-4803SA UB |
| 91-0225 | RX-4803SA UA |
| 91-0226 | RX-4803SA UA |
| 91-0227 | RX-4803SA UA |
| 91-0228 | RX-4803SA AA |
| 91-0229 | RX-4803SA AA |
| 91-0230 | RX-4803SA AA |
Alternatives in the Epson programme
If the RX-4803SA is not quite the right fit — these types come closest:
RX-8803SA
Same series, I²C instead of SPI. Otherwise largely identical figures.
RX-4803LC
The same series in the LC · VSOJ-12, 3.6 × 2.8 mm package. 750 nA typ. · −40 … +85 °C
RA4803SA
AEC-Q100 version, delivered after separate release by Epson. Operation up to −40 … +85 °C.
All 40 families with filters for interface, package, standby current and temperature: real-time clock finder.
Frequently asked questions about the RX-4803SA
How accurate is the RX-4803SA?
±3.4 ppm over Temp (DTCXO). Because the device is digitally temperature compensated, that figure holds across the whole temperature range.
How much current does the RX-4803SA draw in backup?
750 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-4803SA use?
SPI. Package: SA · SOP-14.
Where can I buy the RX-4803SA 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-4803SA.
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.