M41T62
Epson alternative: RX8130CE
The M41T62 comes in two very different shapes: an LCC8 with the crystal embedded, and a QFN16 that needs an external one. Which one you have decides how much of the change is layout work. The comparison below covers the M41T64 and M41T65 as well.
Features of the M41T62: programmable alarm with interrupt, oscillator stop detection, a programmable watchdog from 62.5 ms to 31 minutes and automatic leap-year compensation.
M41T62 versus RX8130CE
| M41T62 — STMicroelectronics | RX8130CE — Epson | |
|---|---|---|
| Manufacturer | STMicroelectronics | Epson (Seiko Epson) |
| Interface | I²C (400 kHz) | I²C (400 kHz) |
| Crystal integrated | LCC8 yes · QFN16 no, external crystal required | yes, factory calibrated |
| Accuracy | not temperature compensated · software calibration in ±2 ppm steps | +5 ±23 ppm at +25 °C (not compensated) |
| Timekeeping current | 350 nA at 3 V | 300 nA typ. · 500 nA max. |
| Supply | 1.3 – 4.4 V · clock down to 1.0 V | 1.25 – 5.5 V |
| Max. temperature | −40 … +85 °C | −40 … +85 °C |
| Package | LCC8 1.5 × 3.2 mm · QFN16 3 × 3 mm | CE 3.2 × 2.5 × 1.0 mm · 8.0 mm² footprint |
| Extras | watchdog, oscillator stop detection, alarm | reset output with delay, charge control with full-charge detection, V_IO pin |
What speaks for and against the change
We sell Epson — and we still say where the competitor is better. You would notice it at the first datasheet comparison anyway.
Honestly
- The LCC8 at 1.5 × 3.2 mm is smaller than Epson's CE package — if board area is the binding constraint, ST wins that line
- The clock keeps running down to 1.0 V, lower than the RX8130CE
- A programmable watchdog from 62.5 ms to 31 minutes is built in
The difference
- Supply: the M41T62 stops at 4.4 V. In a 5 V design it is out — the RX8130CE runs to 5.5 V
- The QFN16 version needs an external 32.768 kHz crystal with matched load capacitance. Epson delivers the module with the crystal inside
- Neither type is temperature compensated, but Epson has the upgrade in the same programme: the RX8901CE holds ±3.0 ppm across −40 to +85 °C with the same interface
- Reset output with a selectable delay, charge control with full-charge detection and a separate V_IO pin
Frequently asked questions
What is the Epson alternative to the M41T62?
The RX8130CE is the closest match on function and current. Where the clock has to stay accurate over temperature, the RX8901CE is the better answer — it is temperature compensated, which the M41T62 is not.
Does the M41T62 need an external crystal?
It depends on the package. The LCC8 version has the 32.768 kHz crystal embedded. The QFN16 version needs a user-supplied crystal with matched load capacitance, and the accuracy then depends on that crystal and the layout.
Can the M41T62 be used in a 5 V design?
Not on the I²C supply — the datasheet gives 1.3 to 4.4 V. That is the most common reason to look for a replacement. Epson's RX8130CE covers 1.25 to 5.5 V.
Who supplies an alternative to the M41T62 in Europe?
Timing Devices Europe in Ladenburg near Heidelberg, Germany stocks the complete Epson RTC programme in its own warehouse — physically on site, not at the manufacturer. Samples, comparison and series demand in one go, answered the same working day.
Samples and a comparison for the M41T62.
Tell us which version you use today, together with quantity and date. We will put together the Epson equivalent with its datasheet and the migration effort — from our own warehouse in Ladenburg near Heidelberg, Germany.