MC33275ST-3.3T3G
Public Unreviewedby Ray
onsemi MC33275ST 3 3T3G Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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README
markdownMC33275ST-3.3T3G
onsemi · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223
MC33275ST-3.3T3G from onsemi, 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 | Vin | power_in | Unregulated input supply. Absolute maximum 13 Vdc; operating range typically [Vout + 1 V] to 12 V. Input capacitor recommended for stability and transient response. |
| 2 | GND | power_in | Ground reference for the regulator. Connect to system ground; ties to the tab (pin 4) internally on the SOT-223 package. |
| 3 | Vout | power_out | Regulated 3.3 V output (3.267 V min / 3.30 V typ / 3.333 V max at 25°C). Supplies up to 300 mA. Requires at least 0.33 µF output capacitance for stability; 1.0 µF or larger recommended for best transient response. |
| 4 | GND | power_in | Ground tab (heat-spreading pad) on the SOT-223 package. Electrically connected to pin 2; solder to a copper ground pour for thermal dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-223 |
| Category | PMIC |
| Pins | 4 |
Ordering variants
Same part, different packaging or reel option.
MC33275ST-3.3T3GMC33275ST-3.3T3GDMC33275ST-3.3T3GDTMC33275ST-3.3T3GMN
CAD (KiCad official)
- Symbol:
MC33275ST-3.3T3G - 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 |
|---|---|---|
mc33275st-3-3t3g.step |
64 KB | You want the bare part, or you mark your own boards. |
mc33275st-3-3t3g-etched.step |
3.0 MB | You want the part with MC33275ST-3.3T3G already on it. |
The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 715 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: onsemi datasheet (14 pp, sha256
684d39955a0981fe, retrieved 2026-08-17, tier: manufacturer) - 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).