# BL8503-40PSM

**BL(Shanghai Belling)** · Linear Voltage Regulators (LDO) · SOT-89-3L

BL8503-40PSM from BL(Shanghai Belling), in a SOT-89-3L. 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 | Vss | power_in | Ground reference pin for the regulator. |
| 2 | Vin | power_in | Supply voltage input; the datasheet gives an input voltage range of 1.5V to 10V and an absolute maximum input voltage of 10V. |
| 3 | Vout | power_out | Regulated output voltage, selectable from 1.2V to 6.0V in 0.1V steps, delivering up to 250mA with a 400mV dropout at 250mA (Vout=3.0V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BL(Shanghai Belling) |
| Package | SOT-89-3L |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Max input voltage |  |  |  | 10 | V |  | 4 |
| Junction Temperature | TJ |  |  | 125 | C |  | 4 |
| Ambient Temperature | TA | -40 |  | 85 | C |  | 4 |
| Power Dissipation SOT-89-3 |  |  |  | 0.5 | W | SOT-89-3 package | 4 |
| Storage Temperature | Ts | -45 |  | 150 | C |  | 4 |
| Lead Temperature |  |  |  | 260 | C | 10S | 4 |
| Input Voltage Range |  |  |  | 8 | V |  | 4 |
| Ambient Temperature |  | -40 |  | 125 | C |  | 4 |

## CAD (KiCad official)

- Symbol: `BL8503-40PSM`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `bl8503-40psm-etched.step` / `bl8503-40psm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl8503-40psm.step` / `bl8503-40psm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BL(Shanghai Belling) datasheet](docs/bl8503-40psm-datasheet.pdf) (13 pp, sha256 `8f6684221c2cf4c4`, retrieved 2026-10-28, 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/bl8503-40psm-datasheet.pdf)