# CJ6211B33M

**Changjing** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-5L

CJ6211B33M from Changjing, in a SOT-23-5L. 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 | Ground reference for the regulator. All voltages are measured with respect to this pin. |
| 2 | VOUT | power_out | Regulated 3.3V output pin. Requires a 1µF ceramic COUT to VSS for stability. Supplies up to 700mA typical (500mA min for VOUT≥1.8V) with 55mV dropout at 100mA. Internally discharged through ~60Ω N-channel FET when CE is de-asserted (B variant). |
| 3 | VIN | power_in | Unregulated input supply pin, 1.8V to 6.0V operating range (absolute max 7V). Bypass to VSS with a 1µF ceramic CIN capacitor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23-5L |
| Category | PMIC |
| Pins | 3 |

## Ordering variants

Same part, different packaging or reel option.

- `CJ6211B33MM`
- `CJ6211B33MN`
- `CJ6211B33MF`

## 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 (High Accuracy) |  | -2 |  | 2 | % | Typ.; feature list | 1 |
| Supply Voltage at VIN | VIN | 1.8 |  | 6 | V |  | 3 |
| Operating Junction Temperature Range | Tj | 0 |  | 125 | °C |  | 3 |
| Operating Free Air Temperature Range | TA | 0 |  | 85 | °C |  | 3 |
| Input Voltage | VIN | -0.3 |  | 7 | V |  | 3 |
| Output Voltage | VOUT | -0.3 |  |  | V | Upper limit printed as VIN+0.3 | 3 |
| Output Current | IOUT |  |  | 700 | mA |  | 3 |
| Operating free air temperature range | TA | -40 |  | 85 | °C |  | 3 |
| Operating Junction Temperature Range | TJ | -40 |  | 125 | °C |  | 3 |
| Storage Temperature | Tstg | -40 |  | 125 | °C |  | 3 |
| Lead Temperature (Soldering, 10 sec) | Tsolder |  |  | 260 | °C | 10 sec | 3 |
| ESD rating Human Body Model |  |  |  | 2 | kV | HBM | 3 |
| ESD rating Machine Model |  |  |  | 200 | V | MM | 3 |
| Power Dissipation | PD |  |  | 0.3 | W | SOT-23-3L/SOT-23-5L package | 3 |
| Supply Current | ISS |  | 50 | 90 | μA | IOUT=0 | 4 |
| Standby Current | ISTBY |  | 0.1 | 1 | μA | CE = VSS | 4 |
| Output Current | IOUT | 500 |  | 700 | mA | VOUT≥1.8V | 4 |
| Dropout Voltage | VDO |  |  | 55 | mV | VOUT = 3.3V, IOUT = 100mA | 4 |
| Load Regulation | ∆VOUT |  |  | 1 | mV | VIN = VOUT +1V | 4 |
| Line Regulation | ∆VOUT / (VOUT × ∆VIN) |  | 0.01 | 0.2 | %/V | IOUT =10mA, VOUT +1V≤VIN≤6V | 4 |
| Output Voltage Temperature Coefficient | ∆VOUT / (∆T × VOUT) |  | 50 |  | ppm | IOUT =10mA, -40≤T≤+85°C | 4 |
| Short Current | IShort |  |  | 100 | mA | VOUT =VSS | 4 |
| Input Voltage | VIN | 1.8 |  | 6 | V |  | 4 |
| CE High Voltage | VCE(H) | 1.5 |  |  | V | Max printed as VIN | 4 |
| CE Low Voltage | VCE(L) |  |  | 0.3 | V |  | 4 |
| Thermal Shutdown | TSD |  |  | 160 | °C |  | 4 |
| Thermal Shutdown Hysteresis | ∆TSD |  |  | 20 | °C |  | 4 |
| COUT Auto-Discharge Resistance | RDISCHRG |  |  | 100 | Ω | VIN=5V | 4 |
| Power Supply Rejection Rate | PSRR |  | 75 |  | dB | IOUT=50mA, 100Hz | 4 |
| Power Supply Rejection Rate | PSRR |  | 80 |  | dB | IOUT=50mA, 1kHz | 4 |
| Power Supply Rejection Rate | PSRR |  | 70 |  | dB | IOUT=50mA, 10kHz | 4 |

## CAD (KiCad official)

- Symbol: `CJ6211B33M`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5L (KiCad packages3D, STEP)
- 3D model files: `cj6211b33m-etched.step` / `cj6211b33m-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cj6211b33m.step` / `cj6211b33m.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`cj6211b33m.step`](cj6211b33m.step) | 85 KB | You want the bare part, or you mark your own boards. |
| [`cj6211b33m-etched.step`](cj6211b33m-etched.step) | 2.1 MB | You want the part with `CJ6211B33M` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 508 faces against 102 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/cj6211b33m-datasheet.pdf) (11 pp, sha256 `805289572b9842e1`, 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/cj6211b33m-datasheet.pdf)