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CM1821B33

Public Made by Adom

by 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.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 (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