BL1117-18CX
Public Unreviewedby Ray
BL Shanghai Belling Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownBL1117-18CX
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
BL1117-18CXBL1117-18CX18AXBL1117-18CX18CYBL1117-18CX18AY
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).