# CJ6101A39M

**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

CJ6101A39M from Changjing, in a SOT-23-3L. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VSS | power_in | Device ground / negative supply return. Connect to system ground; all voltages are referenced to this pin. |
| 2 | VOUT | power_out | Regulated positive output, fixed 3.9 V (A39 suffix) at up to 300 mA. Requires a 1 µF (ceramic or tantalum) output capacitor from VOUT to VSS close to the pin for loop stability and transient response. |
| 3 | VIN | power_in | Unregulated positive supply input, 1.8 V to 8 V (absolute max 9 V). Bypass with a 1 µF ceramic capacitor to VSS; a small series resistor (~3 Ω) with an X5R MLCC is recommended to suppress start-up voltage spikes when hot-plugging to a live source. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `CJ6101A39MM`
- `CJ6101A39MP`
- `CJ6101A39MF`

## CAD (KiCad official)

- Symbol: `CJ6101A39M`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `cj6101a39m-etched.step` / `cj6101a39m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj6101a39m.step` / `cj6101a39m.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj6101a39m-datasheet.pdf) (10 pp, sha256 `281a1425e68c58c2`, 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/cj6101a39m-datasheet.pdf)