# ZLDO1117QG18TA

**Diodes Incorporated** · Linear Voltage Regulators (LDO) · SOT-223-4

ZLDO1117QG18TA from Diodes Incorporated, in a SOT-223-4. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ADJ/GND | power_in | A resistor divider from this pin to VOUT and ground sets the output voltage, and for the fixed-mode ZLDO1117QG18TA this pin is ground only. |
| 2 | VOUT | power_out | The output of the regulator requires a minimum of 4.7µF capacitor with 0.05Ω ≤ ESR ≤ 0.5Ω connected from this pin to ground to ensure stability. |
| 3 | VIN | power_in | The input pin must always be 1.3V higher than VOUT for the device to regulate properly, with a large storage capacitor (0.05Ω ≤ ESR ≤ 0.5Ω) connected to ground. |
| 4 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Diodes Incorporated |
| Package | SOT-223-4 |
| Category | Power Management ICs |
| Pins | 4 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | • Terminals: Finish: Matte Tin Plated Leads, Solderable per M2003 JESD22-B102 • Weight: | 13 |

## CAD (KiCad official)

- Symbol: `ZLDO1117QG18TA`
- Footprint: `Package_TO_SOT_SMD:SOT-223`
- 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files: `zldo1117qg18ta-etched.step` / `zldo1117qg18ta-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `zldo1117qg18ta.step` / `zldo1117qg18ta.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Diodes Incorporated datasheet](https://www.diodes.com/assets/Datasheets/ZLDO1117QG18TA.pdf) (14 pp, sha256 `52a05840bdb17cd6`, retrieved 2026-10-27, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/zldo1117qg18ta-datasheet.pdf)