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BL1117-18CX

Public Unreviewed

by Ray

BL Shanghai Belling Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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BL1117-18CX

BL Shanghai Belling · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

BL1117-18CX from BL Shanghai Belling, in a SOT-223-4. 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 / common return for the regulator. Also serves as the reference node for the internal bandgap and feedback network. The SOT-223 tab is electrically connected to this pin and should be soldered to a copper pour to improve heat dissipation (θJC ≈ 20°C/W).
2 Vout power_out Regulated 1.8V output (1.764V-1.836V over 0≤Iout≤1A, Vin=3.8V). Requires a 10µF tantalum or MLCC output capacitor for stability; ESR range 3mΩ-22Ω. Maximum continuous load current is 1A subject to thermal limits.
3 Vin power_in Unregulated input supply, recommended operating range up to 12V (absolute max 15V). Must be at least Vout + Vdropout (≈1.3V at 1A). A 10µF tantalum or MLCC bypass capacitor to GND is recommended at this pin.

Key specifications

Parameter Value
Manufacturer BL Shanghai Belling
Package SOT-223-4
Category PMIC
Pins 3

Ordering variants

  • BL1117-18CX
  • BL1117-18CX18AX
  • BL1117-18CX18CY
  • BL1117-18CX18AY

CAD (KiCad official)

  • Symbol: BL1117-18CX
  • Footprint: Package_TO_SOT_SMD:SOT-223
  • 3D model: SOT-223-4 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
bl1117-18cx.step 64 KB You want the bare part, or you mark your own boards.
bl1117-18cx-etched.step 1.5 MB You want the part with BL1117-18CX already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 400 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: BL Shanghai Belling datasheet (15 pp, sha256 a7fe7f5c0846d4ca, 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