component
CM1821B33
Public Made by Adomby adom
iCM(创芯微) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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CM1821B33
iCM(创芯微) · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3
CM1821B33 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. |
| 2 | VOUT | power_out | Regulated output (3.3 V for the CM1821B33, ±1% accuracy, up to 150 mA); absolute maximum -0.3 to 6 V to ground, with 1 to 10 µF output capacitor (10 µF typical). |
| 3 | VIN | power_in | Supply input, rated up to 30 V (absolute maximum -0.3 to 30 V to ground), with 1 to 22 µF input capacitor (10 µF typical). |
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 |
|---|---|---|---|---|---|---|---|
| VIN input voltage (to GND) | VIN | -0.3 | 30 | V | VIN 到地耐压 | 3 | |
| VOUT to GND withstand voltage | VOUT | -0.3 | 6 | V | VOUT 到地耐压 | 3 | |
| VOUT to VIN withstand voltage | -30 | 0.3 | V | VOUT 到 VIN 耐压 | 3 | ||
| Operating ambient temperature | -40 | 85 | ℃ | 工作环境温度 | 3 | ||
| Storage temperature | -40 | 150 | ℃ | 存储温度 | 3 | ||
| Operating junction temperature | 150 | ℃ | 工作结温 | 3 | |||
| Thermal resistance, SOT23-3 | 380 | ℃/W | 3 | ||||
| Input capacitor Cin (typical application) | Cin | 1 | 10 | 22 | µF | 典型应用电路 器件标识 | 2 |
| Output capacitor Cout (typical application) | Cout | 1 | 10 | 10 | µF | 典型应用电路 器件标识 | 2 |
| Input voltage | VIN | 30 | V | 4 | |||
| Quiescent current | IGND | 3 | 6 | µA | VIN=12V，空载 | 4 | |
| Output voltage accuracy | VOUT | -1 | 1 | % | VIN=12V，IOUT=10mA | 4 | |
| Output current | IOUT_MAX | 150 | mA | 4 | |||
| Dropout voltage | VDROP | 0.12 | V | IOUT=10mA，ΔVOUT=-VOUTNOM*2% | 4 | ||
| Dropout voltage | VDROP | 0.3 | V | IOUT=50mA，ΔVOUT=-VOUTNOM*2% | 4 | ||
| Dropout voltage | VDROP | 0.6 | V | IOUT=100mA，ΔVOUT=-VOUTNOM*2% | 4 | ||
| Load regulation | ΔVOUT | 30 | 60 | mV | 1mA≤IOUT≤100mA | 4 | |
| Line regulation | ΔVOUT100/ΔVINVOUT | 0.1 | %/V | IOUT=1mA，VIN=(VOUTNOM+1V) to 30V | 4 | ||
| Power supply rejection ratio | PSRR | 50 | dB | IOUT=10mA,f=1KHz | 4 | ||
| Output voltage temperature coefficient | ΔVOUT/ΔTA*VOUT | 80 | ppm/℃ | IOUT=1mA，-40℃< TA <85℃ | 4 | ||
| Short-circuit current | ISHORT | 60 | mA | VIN=(VOUTNOM+1V) to 30V，RLOAD=VOUTNOM/1A | 4 | ||
| Thermal shutdown temperature | TSHDN | 150 | ℃ | 4 |
CAD (KiCad official)
- Symbol:
CM1821B33 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files:
cm1821b33-etched.step/cm1821b33-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cm1821b33.step/cm1821b33.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: iCM(创芯微) datasheet (10 pp, sha256
f283c48fc62baff8, 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, primaryclaude-haiku-5-5(text), consensusclaude-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).
# CM1821B33
**iCM(创芯微)** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3
CM1821B33 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. |
| 2 | VOUT | power_out | Regulated output (3.3 V for the CM1821B33, ±1% accuracy, up to 150 mA); absolute maximum -0.3 to 6 V to ground, with 1 to 10 µF output capacitor (10 µF typical). |
| 3 | VIN | power_in | Supply input, rated up to 30 V (absolute maximum -0.3 to 30 V to ground), with 1 to 22 µF input capacitor (10 µF typical). |
## 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 |
|---|---|---|---|---|---|---|---|
| VIN input voltage (to GND) | VIN | -0.3 | | 30 | V | VIN 到地耐压 | 3 |
| VOUT to GND withstand voltage | VOUT | -0.3 | | 6 | V | VOUT 到地耐压 | 3 |
| VOUT to VIN withstand voltage | | -30 | | 0.3 | V | VOUT 到 VIN 耐压 | 3 |
| Operating ambient temperature | | -40 | | 85 | ℃ | 工作环境温度 | 3 |
| Storage temperature | | -40 | | 150 | ℃ | 存储温度 | 3 |
| Operating junction temperature | | | | 150 | ℃ | 工作结温 | 3 |
| Thermal resistance, SOT23-3 | | | | 380 | ℃/W | | 3 |
| Input capacitor Cin (typical application) | Cin | 1 | 10 | 22 | µF | 典型应用电路 器件标识 | 2 |
| Output capacitor Cout (typical application) | Cout | 1 | 10 | 10 | µF | 典型应用电路 器件标识 | 2 |
| Input voltage | VIN | | | 30 | V | | 4 |
| Quiescent current | IGND | | 3 | 6 | µA | VIN=12V，空载 | 4 |
| Output voltage accuracy | VOUT | -1 | | 1 | % | VIN=12V，IOUT=10mA | 4 |
| Output current | IOUT_MAX | | | 150 | mA | | 4 |
| Dropout voltage | VDROP | | | 0.12 | V | IOUT=10mA，ΔVOUT=-VOUTNOM*2% | 4 |
| Dropout voltage | VDROP | | | 0.3 | V | IOUT=50mA，ΔVOUT=-VOUTNOM*2% | 4 |
| Dropout voltage | VDROP | | | 0.6 | V | IOUT=100mA，ΔVOUT=-VOUTNOM*2% | 4 |
| Load regulation | ΔVOUT | | 30 | 60 | mV | 1mA≤IOUT≤100mA | 4 |
| Line regulation | ΔVOUT*100/ΔVIN*VOUT | | | 0.1 | %/V | IOUT=1mA，VIN=(VOUTNOM+1V) to 30V | 4 |
| Power supply rejection ratio | PSRR | 50 | | | dB | IOUT=10mA,f=1KHz | 4 |
| Output voltage temperature coefficient | ΔVOUT/ΔTA*VOUT | | | 80 | ppm/℃ | IOUT=1mA，-40℃< TA <85℃ | 4 |
| Short-circuit current | ISHORT | | | 60 | mA | VIN=(VOUTNOM+1V) to 30V，RLOAD=VOUTNOM/1A | 4 |
| Thermal shutdown temperature | TSHDN | | | 150 | ℃ | | 4 |
## CAD (KiCad official)
- Symbol: `CM1821B33`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `cm1821b33-etched.step` / `cm1821b33-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cm1821b33.step` / `cm1821b33.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/8603386746394587136) (10 pp, sha256 `f283c48fc62baff8`, 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/cm1821b33-datasheet.pdf)