# HT7550S

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

HT7550S from UMW, in a SOT-23. Pinout and pin descriptions extracted from the datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Device ground reference. Connect to the system ground plane and to the negative terminal of the input and output bypass capacitors. |
| 2 | VIN | power_in | Unregulated input supply. Absolute maximum 30V. Bypass with a 10µF capacitor to GND close to the pin (see application circuit). |
| 3 | VOUT | power_out | Regulated 5.0V ±3% output (4.85V-5.15V typ at VIN=7V, IOUT=10mA). Continuous output current 60-100mA. Bypass with a 10µF capacitor to GND for stability. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output voltage | VOUT | 4.85 | 5 | 5.15 | V | VIN=7V, IOUT=10mA | 6 |
| Output current | IOUT | 60 |  |  | mA | VIN=7V | 6 |
| Output voltage temperature coefficient | ΔVOUT/ΔTA | -0.75 |  | 0.75 | mV/°C | VIN=7V,IOUT=10mA,0°C≤TA≤70°C | 6 |
| Maximum input voltage | VIN |  |  | 30 | V |  | 3 |
| Power waste (SOT-23 package) | PD |  |  | 300 | mW | SOT-23 package | 3 |
| Storage temperature | Tc | -50 |  | 125 | °C |  | 3 |
| Welding temperature | Th |  |  | 260 | °C | 10s | 3 |
| Working temperature | Tw | -40 |  | 85 | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `HT7550S`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ht7550s-etched.step` / `ht7550s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht7550s.step` / `ht7550s.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`ht7550s.step`](ht7550s.step) | 59 KB | You want the bare part, or you mark your own boards. |
| [`ht7550s-etched.step`](ht7550s-etched.step) | 1.3 MB | You want the part with `HT7550S` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 324 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:** [UMW datasheet](docs/ht7550s-datasheet.pdf) (15 pp, sha256 `c8d27849b87576cd`, 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/ht7550s-datasheet.pdf)