SN74LVC1T45DCKR from Texas Instruments, in a SC-70-6. 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	VCCA	power_in	SYSTEM-1 (A-port) supply voltage, 1.65V to 5.5V. Sets the A-port output level and is the reference rail for the DIR input.
2	GND	power_in	Device ground return for both supply rails.
3	A	bidirectional	A-port I/O; when DIR is HIGH the pin drives the translated data from B, when DIR is LOW it accepts input referenced to VCCA. Output level depends on VCCA; drive up to ±24 mA at 3.3V.
4	B	bidirectional	B-port I/O; when DIR is LOW the pin drives the translated data from A, when DIR is HIGH it accepts input referenced to VCCB. Input threshold and output level depend on VCCB.
5	DIR	input	Direction control (referenced to VCCA). LOW = B→A transmission (A drives), HIGH = A→B transmission (B drives). Must be held HIGH or LOW to prevent excess ICC/ICCZ.
6	VCCB	power_in	SYSTEM-2 (B-port) supply voltage, 1.65V to 5.5V. Sets the B-port output level and input threshold.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SC-70-6
Category	Logic
Pins	6

Ordering variants

Same part, different packaging or reel option.

SN74LVC1T45DCKR
SN74LVC1T45DCKRDCKT
SN74LVC1T45DCKRDBVR
SN74LVC1T45DCKRDBVT
SN74LVC1T45DCKRDRLR
SN74LVC1T45DCKRDPKR
SN74LVC1T45DCKRYZPR

CAD (KiCad official)

Symbol: SN74LVC1T45DCKR
Footprint: Package_TO_SOT_SMD:SOT-363_SC-70-6
3D model: SC-70-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sn74lvc1t45dckr.step`	99 KB	You want the bare part, or you mark your own boards.
`sn74lvc1t45dckr-etched.step`	2.2 MB	You want the part with `SN74LVC1T45DCKR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 578 faces against 117 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 (42 pp, sha256 e6fbd84001613995, 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