# HT7533

**TWGMC** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23

HT7533 from TWGMC, in a SOT-23. 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 reference for the regulator. Common return for both input and output currents. |
| 2 | VOUT | power_out | Regulated output. Fixed +3.3V ±3% (3.201-3.399V typical) at up to 100mA. Requires a small output capacitor for stability; typical dropout is 100mV at IOUT=1mA. |
| 3 | VIN | power_in | Unregulated supply input. Absolute maximum +30V; recommended operating range from (VOUT+dropout) up to 24V for line-regulation spec, with headroom needed above the 3.3V output. Bypass to GND with a ceramic capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| Package | SOT-23 |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `HT7533`
- `HT7533-1`

## CAD (KiCad official)

- Symbol: `HT7533`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ht7533-etched.step` / `ht7533-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht7533.step` / `ht7533.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ht7533.step`](ht7533.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`ht7533-etched.step`](ht7533-etched.step) | 1.2 MB | You want the part with `HT7533` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 289 faces against 69 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:** [TWGMC datasheet](docs/ht7533-datasheet.pdf) (12 pp, sha256 `d0d358ba595fe029`, 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](docs/ht7533-datasheet.pdf)