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AMS1117CD-3.3

Public Unreviewed

by Ray

UMW Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

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AMS1117CD-3.3

UMW · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2

AMS1117CD-3.3 from UMW, in a TO-252-2. 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 / reference return for the regulator. On fixed-output versions (including the -3.3 variant) this pin is the device ground; the datasheet labels it GND/ADJ because the same pinout serves as ADJ on the adjustable version.
2 VOUT power_out Regulated 3.3V output pin (typ. 3.234V-3.366V at IOUT=10mA, VIN=5V). Requires an output capacitor (22µF tantalum recommended) for stability. Rated for up to 1A continuous load, limited by thermal dissipation.
3 VIN power_in Unregulated input supply (absolute max 18V; recommended operating input 12V). Should be bypassed with a 10µF capacitor close to the pin. Must be at least VOUT + VDROP (~1.2V @ 1A) above the target 3.3V output.

Key specifications

Parameter Value
Manufacturer UMW
Package TO-252-2
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • AMS1117CD-3.3
  • AMS1117CD-3.3S-3.3
  • AMS1117CD-3.3S

The extractor listed these alongside AMS1117CD-3.3, but they are different parts with different electrical characteristics. Do not order them as substitutes.

  • AMS1117CD-3.3-1.2
  • AMS1117CD-3.3-1.5
  • AMS1117CD-3.3-1.8
  • AMS1117CD-3.3-2.5
  • AMS1117CD-3.3-5.0
  • AMS1117CD-3.3-ADJ

CAD (KiCad official)

  • Symbol: AMS1117CD-3.3
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
ams1117cd-3-3.step 119 KB You want the bare part, or you mark your own boards.
ams1117cd-3-3-etched.step 1.8 MB You want the part with AMS1117CD-3.3 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 485 faces against 83 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: UMW datasheet (13 pp, sha256 5ec219092aa45bd9, 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