# BL9161G-18BADRN

**BL Shanghai Belling** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · DFN-4L(1x1)

BL9161G-18BADRN from BL Shanghai Belling, in a DFN-4L(1x1). 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 | VOUT | power_out | Output voltage of the LDO regulator, rated for up to 300mA output current; a ceramic output capacitor of at least 1µF with ESR above 25mΩ is stated to ensure stability. |
| 2 | GND | power_in | Ground pin; the datasheet recommends separate ground planes for VIN and VOUT, each connected only at this GND pin. |
| 3 | EN | input | Chip enable: the LDO turns on when EN is above 1.2V and shuts down when EN falls below 0.4V, with an internal pull-down resistor; EN can be tied to VIN for continuous operation. |
| 4 | VIN | power_in | Power input voltage, specified at 2.2V to 6V operating range with an absolute maximum of -0.3V to +6V. |
| 5 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | BL Shanghai Belling |
| Package | DFN-4L(1x1) |
| Category | Power Management (PMIC) |
| Pins | 5 |

## CAD (KiCad official)

- Symbol: `BL9161G-18BADRN`
- Footprint: `Package_DFN_QFN:UDFN-4-1EP_1x1mm_P0.65mm_EP0.48x0.48mm`
- 3D model: DFN-4L(1x1) (KiCad packages3D, STEP)
- 3D model files: `bl9161g-18badrn-etched.step` / `bl9161g-18badrn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bl9161g-18badrn.step` / `bl9161g-18badrn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [BL Shanghai Belling datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603089435416817664) (12 pp, sha256 `1f5c35b45955d0cb`, retrieved 2026-10-09, 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/bl9161g-18badrn-datasheet.pdf)