ZLDO1117QG33TA from Diodes Incorporated, in a SOT-223. 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	ADJ/GND	power_in	Ground pin for the fixed-mode (3.3V) variant ZLDO1117QG33TA. In adjustable variants, a resistor divider from this pin to VOUT sets the output voltage; for the fixed 3.3V version this pin is tied to system ground.
2	VOUT	power_out	Regulated 3.3V output (2% tolerance, up to 1A). A minimum 4.7uF capacitor (0.05Ω <= ESR <= 0.5Ω) must be connected from this pin to ground to ensure stability. A larger output capacitor is recommended for improved AC load response. Also connected to the exposed tab.
3	VIN	power_in	Input supply pin (-0.03V to +18V absolute max; 2.7V to 18V recommended). Typically a large storage capacitor (0.05Ω <= ESR <= 0.5Ω) is connected from this pin to ground to keep the input from sagging below the minimum dropout voltage during load transients. VIN must remain at least 1.3V above VOUT (1.5V for correct operation) for the device to regulate properly.
TAB	VOUT (Tab)	power_out	Exposed metal tab electrically connected to VOUT. Used as the primary thermal path; solder to a copper heat-spreading pad on the PCB. Theta_JC = 16 °C/W and Theta_JA = 107 °C/W for SOT-223.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOT-223
Category	PMIC
Pins	4

Ordering variants

Same part, different packaging or reel option.

ZLDO1117QG33TA
ZLDO1117QK33TC

CAD (KiCad official)

Symbol: ZLDO1117QG33TA
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
`zldo1117qg33ta.step`	64 KB	You want the bare part, or you mark your own boards.
`zldo1117qg33ta-etched.step`	2.1 MB	You want the part with `ZLDO1117QG33TA` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 525 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: Diodes Incorporated datasheet (14 pp, sha256 52a05840bdb17cd6, 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