X1A0000610006

X1A0000610006 is a 32.768 kHz tuning-fork crystal from Epson's FC-12M series in a 2.05 x 1.2 x 0.6 mm SMD case — the X1A prefix is Epson's sales-code form, and the part is located under it in Epson's official part-number database. The database values: load capacitance 7 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 size: a full 32.768 kHz fork in a two-millimetre case for wearables and compact modules. 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: the ESR ceiling rises as the case shrinks — 90 kΩ here against 70 kΩ in the FC-135 — so confirm your oscillator's negative resistance margin against this code's figure, not the family's.