CJT1117B-3.3 from Jiangsu, in a SOT-223. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Ground reference for the fixed-output regulator. On the CJT1117B-3.3 (fixed version) this pin is the device ground return; on the ADJ variant the same pin functions as the ADJ feedback node.
2	OUTPUT	power_out	Regulated 3.3V output (3.234V-3.366V over line/load, 10 mA ≤ IOUT ≤ 1 A). Requires a 22 µF tantalum output capacitor for stability per the typical application circuit.
3	IN	power_in	Unregulated input supply. Recommended operating input ≤15 V, absolute max 20 V; requires ≥1.5 V headroom above VOUT (VIN ≥ 4.8 V for the 3.3 V variant). A 10 µF tantalum input capacitor is recommended.

Key specifications

Parameter	Value
Manufacturer	Jiangsu
Package	SOT-223
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

CJT1117B-3.3

CAD (KiCad official)

Symbol: CJT1117B-3.3
Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
3D model: SOT-223 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`cjt1117b-3-3.step`	64 KB	You want the bare part, or you mark your own boards.
`cjt1117b-3-3-etched.step`	1.8 MB	You want the part with `CJT1117B-3.3` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 447 faces against 75 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: Jiangsu datasheet (8 pp, sha256 1aa5012256f1d788, 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