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BL1117-33CX

Public Unreviewed

by Ray

BL Shanghai Belling 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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BL1117-33CX

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

BL1117-33CX from BL Shanghai Belling, 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 return for the regulator. On fixed-voltage versions (including -33) this pin is the device ground reference; on the adjustable version the same pin serves as the ADJ feedback input tied to the external resistor divider.
2 VOUT power_out Regulated 3.3V output (3.234V-3.366V, ±2%) capable of sourcing up to 1A. Requires an output capacitor (10µF typical, compatible with tantalum, electrolytic, or MLCC) for stability.
3 VIN power_in Unregulated input supply, 4.8V to 16V recommended (18V absolute max). Bypass with a 10µF input capacitor close to the pin. Dropout is 1.3V at 1A load.

Key specifications

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

Ordering variants

Same part, different packaging or reel option.

  • BL1117-33CX
  • BL1117-33CX33AX
  • BL1117-33CX33CY
  • BL1117-33CX33AY

CAD (KiCad official)

  • Symbol: BL1117-33CX
  • 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
bl1117-33cx.step 64 KB You want the bare part, or you mark your own boards.
bl1117-33cx-etched.step 1.7 MB You want the part with BL1117-33CX already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 428 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 (16 pp, sha256 fcde732a0d8dde18, 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