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AMS1117-2.5V

Public Unreviewed

by Ray

MSKSEMI AMS1117 2 5V Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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AMS1117-2.5V

MSKSEMI AMS1117 2 5V · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

AMS1117-2.5V from MSKSEMI AMS1117 2 5V, 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 GND power_in Ground / VSS reference pin. On the fixed 2.5 V version this pin is the device ground return (the datasheet labels the pin 'VSS/ADJ' because the same silicon is used for the adjustable variant, where it becomes the ADJ feedback input).
2 VOUT power_out Regulated 2.5 V output (typ. 2.5 V, min 2.45 V, max 2.55 V at Vin=3.8 V, 0 ≤ Iout ≤ 1 A). Requires a ~10 uF tantalum output capacitor for stability.
3 VIN power_in Unregulated input voltage. For the 2.5 V variant, Vin must be ≥ 3.8 V for full regulation (dropout ~1.3 V @ 1 A). Absolute maximum input voltage is 18 V; recommended maximum operating input is 15 V. Requires a ~10 uF tantalum bypass capacitor.
4 VOUT power_out Regulated 2.5 V output; electrically connected to pin 2. This is the large tab pad on the SOT-223 package and also serves as the primary thermal path to the PCB copper pour.

Key specifications

Parameter Value
Manufacturer MSKSEMI AMS1117 2 5V
Package SOT-223
Category PMIC
Pins 4

Ordering variants

  • AMS1117-2.5VAMS1117-25
  • AMS1117-2.5VAMS1117CD-25

CAD (KiCad official)

  • Symbol: AMS1117-2.5V
  • 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
ams1117-2-5v.step 64 KB You want the bare part, or you mark your own boards.
ams1117-2-5v-etched.step 1.5 MB You want the part with AMS1117-2.5V already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 404 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: MSKSEMI AMS1117 2 5V datasheet (14 pp, sha256 768f1a5d913d6211, 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