# HT7540-2-MS

**MSKSEMI** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3

HT7540-2-MS from MSKSEMI, in a SOT-89-3. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground reference pin of the linear regulator. |
| 2 | VIN | power_in | Regulator input pin; the series is stated to withstand voltage up to 30V. |
| 3 | VOUT | power_out | Regulated output pin, 4.0V for HT7540-2-MS, with output voltage accuracy of ±1%, rated for up to 100mA output current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-89-3 |
| Category | Power Management (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 accuracy |  | -1 |  | 1 | % | Printed as tolerance ±1% in features | 2 |
| Withstanding voltage |  |  |  | 30 | V | Printed as withstanding voltage 30V in features | 2 |
| Quiescent current |  |  | 1.5 |  | μA | Printed as quiescent current 1.5μA in features; no test conditions given | 2 |
| High output current |  |  | 100 |  | mA | Printed as high output current 100mA in features; no test conditions given | 2 |
| Nominal output voltage | VOUT |  | 4 |  | V | Output option 4.0V for HT7540-2-MS per order information | 3 |

## CAD (KiCad official)

- Symbol: `HT7540-2-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files: `ht7540-2-ms-etched.step` / `ht7540-2-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ht7540-2-ms.step` / `ht7540-2-ms.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [MSKSEMI datasheet](docs/ht7540-2-ms-datasheet.pdf) (11 pp, sha256 `7c6d79ef158c63b9`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ht7540-2-ms-datasheet.pdf)