SN74AHCT1G125DCKR from Texas Instruments, in a SC-70-5. 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	OE	input	Active-low output enable. When OE is low, the buffer passes A to Y; when OE is high, the Y output is placed in a high-impedance (3-state) condition. Should be tied to VCC through a pull-up resistor during power up/down to ensure high-Z state.
2	A	input	Buffer data input. TTL-compatible input (VIH min 2 V, VIL max 0.8 V at VCC = 4.5-5.5 V). Driven to output Y when OE is asserted low.
3	GND	power_in	Ground reference (0 V) for the device.
4	Y	tri_state	3-state buffer output. Drives ±8 mA at VCC = 5 V; high-impedance when OE is high. Follows A when OE is low.
5	VCC	power_in	Positive supply voltage input. Recommended operating range 4.5 V to 5.5 V; absolute maximum 7 V. Typical ICC 10 µA max.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SC-70-5
Category	Logic
Pins	5

Ordering variants

Same part, different packaging or reel option.

SN74AHCT1G125DCKR
SN74AHCT1G125DCKRDCKT
SN74AHCT1G125DCKRDBVR
SN74AHCT1G125DCKRDBVT
SN74AHCT1G125DCKRDRLR

CAD (KiCad official)

Symbol: SN74AHCT1G125DCKR
Footprint: Package_TO_SOT_SMD:SOT-353_SC-70-5
3D model: SC-70-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74ahct1g125dckr.step`	87 KB	You want the bare part, or you mark your own boards.
`sn74ahct1g125dckr-etched.step`	2.7 MB	You want the part with `SN74AHCT1G125DCKR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 671 faces against 102 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: Texas Instruments datasheet (26 pp, sha256 dbaf49b3af33690f, retrieved 2026-08-17, tier: manufacturer)
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