JY1117E33AX from Shenzhen JingYang, in a SOT-223-4. 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	GND	power_in	Ground return for the fixed-output 3.3 V version. On the adjustable variant this same pin is the Adj feedback input; because JY1117E33AX is a fixed-mode part, it is tied to system ground. Per datasheet 'Ground only for Fixed-Mode'.
2	VOUT	power_out	Regulated 3.3 V output (typ 3.300 V, min 3.235 V, max 3.365 V at IOUT=10 mA). Rated for 1 A continuous. Requires a minimum 0.2 µF X7R/X5R MLCC (or 3.3 µF EL, 10 mΩ ≤ ESR ≤ 1 Ω) from this pin to ground for stability. The SOT-223 tab is internally connected to VOUT and serves as the heat-sink pad.
3	VIN	power_in	Regulator input supply, 2.7 V to 12 V operating (abs max -0.3 V to 15 V). Must be at least VOUT + 1.4 V (dropout) to regulate; datasheet recommends at least 1.5 V headroom above VOUT. A local input storage capacitor to ground is required to prevent the input from sagging below the dropout during load transients.

Key specifications

Parameter	Value
Manufacturer	Shenzhen JingYang
Package	SOT-223-4
Category	PMIC
Pins	3

Ordering variants

Same part, different packaging or reel option.

JY1117E33AX
JY1117E33AXEXX
JY1117E33AXEXXA
JY1117E33AXD33
JY1117E33AXD33A
JY1117E33AXDXX
JY1117E33AXDXXA
JY1117E33AXF33
JY1117E33AXF33A
JY1117E33AXFXX
JY1117E33AXFXXA

CAD (KiCad official)

Symbol: JY1117E33AX
Footprint: Package_TO_SOT_SMD:SOT-223
3D model: SOT-223-4 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`jy1117e33ax.step`	64 KB	You want the bare part, or you mark your own boards.
`jy1117e33ax-etched.step`	1.6 MB	You want the part with `JY1117E33AX` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 413 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: Shenzhen JingYang datasheet (14 pp, sha256 fe77cb471f1f490b, 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