# BL1084-18CS

**BL(Shanghai Belling)** · Linear Voltage Regulators (LDO) · TO-263-2

BL1084-18CS from BL(Shanghai Belling), in a TO-263-2. 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 fixed 1.8V regulator, to which the input and output bypass capacitors return. |
| 2 | Vout | power_out | Regulated 1.8V output; a 22uF tantalum capacitor between output and GND is recommended for all applications. |
| 3 | Vin | power_in | Unregulated input supply, with a maximum input voltage of 15V; a 10uF tantalum bypass capacitor between input and GND is recommended. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BL(Shanghai Belling) |
| Package | TO-263-2 |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage (BL1084-1.80V) | Vout | 1.773 | 1.8 | 1.827 | V | Iout=0mA, Vin=4.8V, Tj=25℃ | 3 |
| Output Voltage (BL1084-1.80V) | Vout | 1.764 | 1.8 | 1.836 | V | 10mA≤Iout≤5A, 3.4V≤Vin≤7V | 3 |
| Line Regulation (BL1084-1.8V) | ΔVout |  | 10 | 40 | mV | Iout=10mA, 3.4V≤Vin≤10V | 3 |
| Load Regulation (BL1084-1.8V) | ΔVout |  | 16 | 50 | mV | Vin-Vout=1.6V, 0≤Iout≤5A | 3 |
| Dropout Voltage | Vin-Vout |  | 1.4 | 1.6 | V | ΔVout, ΔVref =1%, Iout=5A | 4 |
| Current Limit | Ilimit | 7 |  |  | A | Vin-Vout=3V, Tj=25℃ | 4 |
| Quiescent Current | Iq |  | 5 | 10 | mA | Vin=10V | 4 |
| Ripple Rejection |  | 60 | 65 |  | dB | F=120Hz, Cout=25uF(tan), Iout=5A, Vin-Vout=3V | 4 |
| Temperature Stability |  |  | 0.5 |  | % | Iout=10mA, Vin-Vout=1.5V | 4 |
| Thermal Resistance junction to case (TO-263) | θJC |  | 3 |  | ℃/W | TO-263 | 4 |
| Over Temperature Protection | OTP |  | 150 |  | ℃ |  | 4 |
| Max Input Voltage |  |  |  | 15 | V |  | 2 |
| Operating Junction Temperature | Tj |  |  | 150 | C |  | 2 |
| Ambient Temperature | Ta | -40 |  | 85 | C |  | 2 |
| Package Thermal Resistance TO-263 |  |  | 3 |  | ℃/W | TO-263 | 2 |
| Storage Temperature | Ts | -40 |  | 150 | C |  | 2 |
| Lead Temperature & Time |  |  |  | 260 | C | 10S | 2 |
| Input Voltage Range |  |  |  | 15 | V |  | 2 |
| Operating Junction Temperature | Tj | -20 |  | 125 | C |  | 2 |

## CAD (KiCad official)

- Symbol: `BL1084-18CS`
- Footprint: `Package_TO_SOT_SMD:TO-263-2`
- 3D model: TO-263-2 (KiCad packages3D, STEP)
- 3D model files: `bl1084-18cs-etched.step` / `bl1084-18cs-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl1084-18cs.step` / `bl1084-18cs.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BL(Shanghai Belling) datasheet](docs/bl1084-18cs-datasheet.pdf) (13 pp, sha256 `bb5efe271c8036b3`, retrieved 2026-10-31, 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/bl1084-18cs-datasheet.pdf)