RX8025T-UC from Seiko Epson, in a SOP-14-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	T1(CE)	input	Manufacturer test pin. Do not connect externally.
2	SCL	input	I2C-Bus serial clock input. Interface speed up to 400 kHz. Requires external pull-up to VDD (1.8-5.5 V).
3	FOUT	output	Reference clock output (CMOS output, CL = 30 pF). Selectable 32.768 kHz, 1024 Hz, or 1 Hz. Enabled via the FOE pin.
4	N.C.	unconnected	No internal connection. Leave open or tie to GND per board practice.
5	TEST	input	Manufacturer test pin. Do not connect externally.
6	VDD	power_in	Positive supply input. Wide timekeeper range 1.6-5.5 V; interface 1.8-5.5 V; temperature-compensated range 2.2-5.5 V. Decouple locally.
7	FOE	input	FOUT output enable control input. Drive high to enable FOUT, low to disable.
8	N.C.	unconnected	No internal connection.
9	N.C.	unconnected	No internal connection.
10	/INT	output	Interrupt output, N-channel open drain. Asserted low by alarm or timer events. Requires external pull-up resistor to VDD.
11	GND	power_in	Ground reference (0 V).
12	T2(VPP)	input	Manufacturer test pin (VPP). Do not connect externally.
13	SDA	bidirectional	I2C-Bus serial data input/output (open-drain). Requires external pull-up to VDD.
14	N.C.	unconnected	No internal connection.

Key specifications

Parameter	Value
Manufacturer	Seiko Epson
Package	SOP-14-208mil
Category	RTC
Pins	14

Ordering variants

Same part, different packaging or reel option.

RX8025T-UC

CAD (KiCad official)

Symbol: RX8025T-UC
Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
3D model: SOP-14-208mil (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rx8025t-uc.step`	195 KB	You want the bare part, or you mark your own boards.
`rx8025t-uc-etched.step`	2.5 MB	You want the part with `RX8025T-UC` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 618 faces against 237 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Seiko Epson datasheet (1 pp, sha256 4549e3348da5559a, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF