# DS8561-33S5

**DSTECH** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5

DS8561-33S5 from DSTECH, in a SOT-23-5. 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 | Power supply input, 1.2V to 5.5V (absolute max 7V). A 1μF ceramic bypass capacitor to GND is recommended close to the pin. |
| 2 | GND | power_in | Device ground reference. |
| 3 | EN | input | Enable control input. VIH ≥ 1.0V enables the regulator; VIL ≤ 0.4V puts the part into shutdown (~100nA typ.). EN input current ≈10nA at VEN=5V. Do not leave floating; tie to VIN for always-on. |
| 4 | NC | unconnected | No internal connection (floating). May be left open or tied to any potential without affecting operation. |
| 5 | VOUT | power_out | Regulated 3.3V output, up to 300mA. Requires a ≥1μF ceramic (or tantalum) output capacitor to GND for stability. Dropout ≈0.18V at ILOAD=300mA for the 3.3V option; internally current-limited (~600mA typ.). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DSTECH |
| Package | SOT-23-5 |
| Category | PMIC |
| Pins | 5 |

## Ordering variants

Same part, different packaging or reel option.

- `DS8561-33S5`
- `DS8561-33S5SS3`
- `DS8561-33S5S3`
- `DS8561-33S5C5`
- `DS8561-33S5D4`
- `DS8561-33S5D6`

## CAD (KiCad official)

- Symbol: `DS8561-33S5`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `ds8561-33s5-etched.step` / `ds8561-33s5-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ds8561-33s5.step` / `ds8561-33s5.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ds8561-33s5.step`](ds8561-33s5.step) | 85 KB | You want the bare part, or you mark your own boards. |
| [`ds8561-33s5-etched.step`](ds8561-33s5-etched.step) | 2.6 MB | You want the part with `DS8561-33S5` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 605 faces against 102 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:** [DSTECH datasheet](docs/ds8561-33s5-datasheet.pdf) (19 pp, sha256 `b28c6b5e18533c57`, 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/ds8561-33s5-datasheet.pdf)