X1A0001210005

X1A0001210005 is a 32.768 kHz tuning-fork crystal from Epson's FC1610AN series in a 1.65 x 1.05 x 0.5 mm SMD case, listed in Epson's official part-number database. The database values: load capacitance 12.5 pF, equivalent series resistance 90 kΩ maximum, frequency tolerance ±20 ppm at +25 °C (at a 0.1 µW drive level), turnover temperature +25 °C ±5 °C, parabolic coefficient −0.04 ppm/°C² (the maker's maximum figure), aging ±3 ppm maximum in the first year at +25 °C, maximum drive level 0.5 µW, gold-plated terminals, operating range −40 °C to +85 °C. The selection point is the smallest mainstream RTC footprint with the standard 12.5 pF load — the part for designs where the crystal is placed by the square millimetre. Ordering form: this page carries the stable base code from Epson's database — the final orderable form adds a two-character packing suffix, so the complete string is confirmed when you request a quote rather than assumed here. Selection advice: at this size the layout is part of the component — keep the oscillator traces to the datasheet pattern, and design the drive level against the 0.5 µW maximum, since overdriving a miniature fork is a frequency and aging error, not just a stress figure.