# AMS1117-1.2: 1 A Fixed 1.2 V LDO, SOT-223

Fixed 1.2 V variant of the ubiquitous AMS1117 1 A low-dropout linear regulator, in the SOT-223 package with the tab carrying VOUT (pin 2). Needs a 22 uF output capacitor for stability per the datasheet.

## Key specs

| Parameter | Value |
|---|---|
| Output voltage | 1.2 V fixed |
| Output current | 1 A |
| Dropout | 1.3 V max at 1 A |
| Input range | up to 15 V |
| Package | SOT-223, tab = pin 2 (VOUT) |

## Where it is used

Supplies the KSZ9131 gigabit PHY 1.2 V core rail (U902) on the [Large Automotive Eth Switch Molecule](https://wiki.adom.inc/adom/large-automotive-eth-switch-molecule), fed from the 3.3 V rail.

Note: the sibling page [ams1117-3-3](https://wiki.adom.inc/adom/ams1117-3-3) covers the 3.3 V variant.

## Ordering

| Vendor | Part number |
|---|---|
| AMS / UMW and second sources | AMS1117-1.2 |

## Files

| File | What |
|---|---|
| `ams1117-1-2.kicad_sym` | KiCad symbol (3 pins) |
| `SOT-223-3_TabPin2.kicad_mod` | KiCad footprint |
| `ams1117-1-2.step` / `ams1117-1-2.glb` | 3D model |
| `ams1117-1-2.lbr` | Fusion 360 / EAGLE library |
| `ams1117-1-2.adom-lbr.json` | adom-lbr canonical JSON |