# CM1842B33

**iCM(创芯微)** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3

CM1842B33 from iCM(创芯微), in a SOT-23-3. 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 (地); it is pin 1 on the SOT23-3 variant. |
| 2 | VOUT | power_out | Regulated 3.3 V output; absolute maximum VOUT-to-GND is -0.3 V to 7 V, and output current is rated up to 300 mA (350 mA typical max limit per the table). |
| 3 | VIN | power_in | Input supply; the input voltage range is 3 V to 45 V, with absolute maximum VIN-to-GND of -0.3 V to 50 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | iCM(创芯微) |
| Package | SOT-23-3 |
| Category | Power Management (PMIC) |
| 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 |
|---|---|---|---|---|---|---|---|
| 输入电压 | VIN | 3 |  | 45 | V |  | 5 |
| 输出电压 | VOUT | -2 |  | 2 | % | VIN=12V, IOUT=10mA | 5 |
| 输出电流 | IOUT_MAX | 300 |  | 350 | mA |  | 5 |
| 输入输出压差 | VDROP |  |  | 35 | mV | IOUT=10mA, ΔVOUT=-0.1V | 5 |
| 输入输出压差 | VDROP |  |  | 350 | mV | IOUT=100mA, ΔVOUT=-0.1 | 5 |
| 负载调整率 | ΔVOUT |  |  | 0.1 | mV/mA | 1mA≤IOUT≤100mA | 5 |
| 线性调整率 | ΔVOUT*100/ΔVIN*VOUT |  |  | 0.1 | mV/V | IOUT=1mA, VIN=(VOUTNOM+0.5V) to 42V | 5 |
| 电源抑制比 | PSRR |  |  | 70 | dB | IOUT=10mA, f=1KHz | 5 |
| 限流保护 | ILIMIT |  |  | 500 | mA |  | 5 |
| 过温保护 | TSHDN |  |  | 145 | ℃ |  | 5 |
| 过温恢复 | TSHDNR |  |  | 125 | ℃ |  | 5 |
| VIN到地耐压 |  | -0.3 |  | 50 | V |  | 4 |
| VOUT到地耐压 |  | -0.3 |  | 7 | V |  | 4 |
| VOUT到VIN耐压 |  | -50 |  | 0.3 | V |  | 4 |
| 工作环境温度 |  | -40 |  | 85 | ℃ |  | 4 |
| 存储温度 |  | -40 |  | 150 | ℃ |  | 4 |
| 工作结温 |  |  |  | 150 | ℃ |  | 4 |
| 热阻 SOT23-3 |  |  |  | 250 | ℃/W |  | 4 |

## CAD (KiCad official)

- Symbol: `CM1842B33`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `cm1842b33-etched.step` / `cm1842b33-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cm1842b33.step` / `cm1842b33.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [iCM(创芯微) datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603386758210211840) (14 pp, sha256 `528af0d27dbbd15b`, retrieved 2026-10-17, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/cm1842b33-datasheet.pdf)