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CM1843AA2
Public Made by Adomby adom
iCM(创芯微) Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-89-3. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownCM1843AA2
iCM(创芯微) · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-89-3
CM1843AA2 from iCM(创芯微), in a SOT-89-3. 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; the regulator's common return, and the datasheet limits VIN-to-GND to -0.3 V to 45 V and VOUT-to-GND to -0.3 V to Vin+7 V. |
| 2 | VIN | power_in | Supply input, specified for 3 V to 40 V with an absolute maximum of -0.3 V to 45 V to GND, and the datasheet notes VOUT-to-VIN must stay within -50 V to 0.3 V. |
| 3 | VOUT | power_out | Regulated fixed 12 V output, rated for up to 300 mA, with VOUT-to-GND limited to -0.3 V to Vin+7 V and VOUT-to-VIN limited to -50 V to 0.3 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | iCM(创芯微) |
| Package | SOT-89-3 |
| 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 Input voltage | VIN | 3 | 40 | V | 4 | ||
| 静态电流 Quiescent current | IGND | 2.8 | 6.5 | µA | VIN=12V, no load | 4 | |
| 输出电压精度 Output voltage accuracy | VOUT | -2 | 2 | % | VIN=18V, IOUT=10mA | 4 | |
| 输出电流 Output current | IOUT_MAX | 300 | 350 | mA | 4 | ||
| 输入输出压差 Dropout voltage (VOUT=3.0~13V row, applies to 12V) | VDROP | 1000 | 1500 | mV | VOUT=3.0~13V | 4 | |
| 负载调整率 Load regulation | ΔVOUT | 0.1 | mV/mA | 1mA≤IOUT≤100mA | 4 | ||
| 线性调整率 Line regulation | ΔVOUT100/ΔVINVOUT | 0.3 | mV/V | IOUT=1mA, VIN=(VOUTNOM+2V) to 40V | 4 | ||
| 电源抑制比 Power supply rejection ratio | PSRR | 70 | dB | IOUT=10mA, f=1KHz | 4 | ||
| 限流保护 Current limit | ILIMIT | 450 | 800 | mA | 4 | ||
| 过温保护 Thermal shutdown | TSHDN | 155 | ℃ | 4 | |||
| 过温恢复 Thermal shutdown recovery | TSHDNR | 125 | ℃ | 4 | |||
| 使能高电平 EN high enabled threshold | 1 | V | EN High Enabled | 4 | |||
| 使能低电平关断 EN low shutdown threshold | 0.4 | V | EN Low Shutdown | 4 | |||
| VIN到地耐压 VIN to GND voltage | VIN | -0.3 | 45 | V | 3 | ||
| VOUT到地耐压 VOUT to GND voltage | VOUT | -0.3 | V | Printed max is Vin+7 V (not a fixed number) | 3 | ||
| VOUT到VIN耐压 VOUT to VIN voltage | VOUT-VIN | -50 | 0.3 | V | 3 | ||
| 工作环境温度 Operating ambient temperature | TA | -40 | 85 | ℃ | 3 | ||
| 存储温度 Storage temperature | TSTG | -40 | 150 | ℃ | 3 | ||
| 工作结温 Operating junction temperature | TJ | 150 | ℃ | 3 | |||
| 热阻 Thermal resistance SOT89-3 | θJA | 180 | ℃/W | SOT89-3 | 3 | ||
| HBM ESD | HBM | 2 | KV | Printed as 2K V | 3 | ||
| CDM ESD | CDM | 1.5 | KV | Printed as 1.5K V | 3 |
CAD (KiCad official)
- Symbol:
CM1843AA2 - Footprint:
Package_TO_SOT_SMD:SOT-89-3 - 3D model: SOT-89-3 (KiCad packages3D, STEP)
- 3D model files:
cm1843aa2-etched.step/cm1843aa2-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);cm1843aa2.step/cm1843aa2.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: iCM(创芯微) datasheet (11 pp, sha256
6c81b4864a8d9878, retrieved 2026-10-18, 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).