# AMS1117-5.0

**Advanced Monolithic Systems** · 1 A LDO regulator (fixed 5 V) · SOT-223

The 5 V version of the AMS1117, a 1 A low-dropout linear regulator in the SOT-223 tab package. It regulates a higher unregulated input down to a fixed 5 V with 1.5% reference tolerance, dropping about 1.3 V at 0.8 A, so a 7-12 V input gives a clean 5 V rail for logic, USB, and sensors. Internal current limiting and thermal shutdown protect it, and a 10 uF output capacitor keeps it stable. The tab (pin 2) is the output and the thermal path. Use the AMS1117-3.3 for 3.3 V rails.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference for the fixed-output regulator. Internally the top of the divider is Kelvin-connected to VOUT so this pin can be used for negative-side sensing at the load. |
| 2 | VOUT | power_out | Regulated 5.0V output. Requires a 22uF solid tantalum output capacitor for frequency compensation and stability across all load conditions. Delivers up to 1A with 1.3V max dropout at 0.8A. |
| 3 | VIN | power_in | Unregulated input supply. Must be at least VOUT + 1.3V (dropout) up to a 15V absolute maximum. An input capacitor is recommended when the source impedance is significant or when the input line is long. |

## Key specifications

| Parameter | Value |
|---|---|
| Type | Fixed LDO linear regulator |
| Output voltage | 5.0 V (1.5% tol) |
| Output current | up to 1 A |
| Dropout | 1.3 V max at 0.8 A |
| Protection | Current limit + thermal shutdown |
| Output cap | 10 µF (stability) |
| Package | SOT-223 (tab = VOUT) |
| Line regulation | typ. 0.2% |

## Ordering variants

Same part, different packaging or reel option.



## Related parts (NOT interchangeable)

The extractor listed these alongside AMS1117-5.0, but they are **different parts** with different electrical characteristics. Do not order them as substitutes.

- `AMS1117-5.0 (SOT-223)`
- `AMS1117-5.0/TR (SOT-223, tape & reel)`

## CAD (KiCad official)

- Symbol: `Regulator_Linear:AMS1117-5.0`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D)
- 3D model files: `ams1117-5v0-etched.step` / `ams1117-5v0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ams1117-5v0.step` / `ams1117-5v0.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Advanced Monolithic Systems datasheet](http://www.advanced-monolithic.com/pdf/ds1117.pdf) (8 pp, sha256 `189a2651878a87d5`, 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](docs/ams1117-5v0-datasheet.pdf)