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LD1117-2.5

Public Unreviewed

by Ray

UMW 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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LD1117-2.5

UMW · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

LD1117-2.5 from UMW, 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 / device reference return. In the fixed-output LD1117-2.5, the pin-1 ADJ/GND node functions as GND (the internal feedback F1/F2 divider is connected and the A switch is disconnected per the block diagram).
2 VOUT power_out Regulated 2.5V output (2.450V-2.550V typ. at IOUT=10mA, VIN=4.5V, TJ=25°C). Supplies up to 1A load current. Requires an output capacitor for stability; on SOT-223 the tab is electrically connected to VOUT and serves as the primary heatsink.
3 VIN power_in Unregulated input supply. Absolute maximum 18V; recommended operating input 12V max. For fixed 2.5V output the minimum VIN must exceed VOUT + dropout (~1.2V @ 1A).

Key specifications

Parameter Value
Manufacturer UMW
Package SOT-223
Category PMIC
Pins 3

Ordering variants

Same part, different packaging or reel option.

  • LD1117-2.5
  • LD1117CD-2.5
  • LD1117S-2.5

CAD (KiCad official)

  • Symbol: LD1117-2.5
  • 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
ld1117-2-5.step 64 KB You want the bare part, or you mark your own boards.
ld1117-2-5-etched.step 1.2 MB You want the part with LD1117-2.5 already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 320 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: UMW datasheet (14 pp, sha256 b65a8249b6e9e313, 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