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BL1117-33CY

Public Made by Adom

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BL Shanghai Belling Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2(DPAK). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
Name Last commit message Last updated
docs bl1117-33cy: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain ST… · Ray 24d ago
viewers pin 1: carry the footprint's marker into the .lbr, the viewer and page.json (silk-marker, drawn, top-left) · Ray 2mo ago
bl1117-33cy-etched.fit.json bl1117-33cy: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
bl1117-33cy-etched.glb bl1117-33cy: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain ST… · Ray 24d ago
bl1117-33cy-etched.step bl1117-33cy: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain ST… · Ray 24d ago
bl1117-33cy.glb Publish 0.1.0 · Ray 2mo ago
bl1117-33cy.kicad_mod Publish 0.1.0 · Ray 2mo ago
bl1117-33cy.kicad_sym Publish 0.1.0 · Ray 2mo ago
bl1117-33cy.lbr rebuild the library on adom-lbr 2.32.0. The published copy was built by 2.18.0, which imported every KiCad roundrect an… · Ray 2mo ago
bl1117-33cy.step Publish 0.1.0 · Ray 2mo ago
package.json Publish 0.2.0 · Ray 2mo ago
pads.json pinmap.json: symbol pin 4 (Vout(Tab)) lands on pad 2. On a DPAK the tab IS the middle lead, so the footprint gives it t… · Ray 2mo ago
page.json bl1117-33cy: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain ST… · Ray 24d ago
pinmap.json pinmap.json: symbol pin 4 (Vout(Tab)) lands on pad 2. On a DPAK the tab IS the middle lead, so the footprint gives it t… · Ray 2mo ago
README.md bl1117-33cy: laser-etched CAD + chip hero (factory 2.0.0 backfill) · Ray 1mo ago

BL1117-33CY

BL Shanghai Belling · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2(DPAK)

BL1117-33CY from BL Shanghai Belling, in a TO-252-2(DPAK). 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 path for quiescent current (typ. 2mA, max 5mA) and load current up to 1A. Connect directly to the system ground plane.
2 Vout power_out Regulated 3.3V output (min 3.234V, typ 3.3V, max 3.366V). Supplies up to 1A load current with 10mV typical load regulation. Requires a 10µF tantalum or MLCC output capacitor for stability.
3 Vin power_in Unregulated input supply. Operating range up to 12V (absolute max 15V). Must be ≥ Vout + 1.3V dropout at 1A. Bypass with a 10µF tantalum or MLCC capacitor as close to the pin as possible.
4 Vout(Tab) power_out Exposed metal tab of the TO-252 (DPAK) package. Electrically fused to pin 2 (Vout) as is standard for this device family. Solder to a large copper pour to sink heat (θJC ≈ 10°C/W); this is the primary heat-dissipation path.

Key specifications

Parameter Value
Manufacturer BL Shanghai Belling
Package TO-252-2(DPAK)
Category PMIC
Pins 4

Ordering variants

  • BL1117-33CY
  • BL1117-33CY33AY
  • BL1117-33CY33CX
  • BL1117-33CY33AX

CAD (KiCad official)

  • Symbol: BL1117-33CY
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
  • 3D model files: bl1117-33cy-etched.step / bl1117-33cy-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); bl1117-33cy.step / bl1117-33cy.glb are the bare package body.

3D model downloads

Two STEP files. Same geometry, different body top:

File Size Use it when
bl1117-33cy.step 119 KB You want the bare part, or you mark your own boards.
bl1117-33cy-etched.step 1.7 MB You want the part with BL1117-33CY already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 451 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: 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