component
LR8103A-T33
Public Made by Adomby adom
LR Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-23-3L. 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
markdownLR8103A-T33
LR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L
LR8103A-T33 from LR, in a SOT-23-3L. 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 for all voltages; connect to a large copper pour for noise immunity and heat dissipation. |
| 2 | VOUT | power_out | Regulated 3.3V output (±1%, VOUT0.99 to VOUT1.01 at 10mA) delivering 300mA typical, with short-circuit current clamped to 30mA typ; needs an output capacitor of at least 1µF ceramic. |
| 3 | VIN | power_in | Supply input with 6.5V maximum operating input voltage (9V absolute maximum); needs a bypass capacitor of at least 1µF ceramic close to the pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LR |
| Package | SOT-23-3L |
| 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 |
|---|---|---|---|---|---|---|---|
| 最大输入电源电压 (max input supply voltage) | VIN | 9 | V | 4 | |||
| 最大输出电流 (max output current) | IOUT | 450 | mA | 4 | |||
| 耗散功率 (power dissipation) | PD | 250 | mW | SOT23-3L | 4 | ||
| 工作温度 (operating temperature) | TOPR | -10 | 85 | ℃ | 4 | ||
| 存储温度 (storage temperature) | TSTG | -40 | 125 | ℃ | 4 | ||
| ESD HBM | -2000 | 2000 | V | HBM POS/NEG | 4 | ||
| 输入电压 (input voltage) | VIN | 6.5 | V | ISS=1uA | 4 | ||
| 输出电压精度 (output voltage accuracy, printed ±1%) | VOUT | -1 | 1 | % | 1 | ||
| 使能电压 (enable voltage) | VCE | 0.7 | 1.2 | V | VIN=2.2V, IOUT=1mA | 4 | |
| 线性调整度 (line regulation) | △VOUT | -30 | 30 | mV | VOUT+1V≤VIN≤6.5V, VIN=VCE, IOUT=10mA | 4 | |
| 负载调整度 (load regulation) | △VOUT | -40 | 40 | mV | VIN=VCE=VOUT+1V, 1mA≤IOUT≤100mA | 4 | |
| 停机电流 (shutdown current) | ISHD | -1 | 1 | uA | VIN=VOUT+1V, VCE=0V | 5 | |
| 静态电流 (quiescent current) | ISS | 0.8 | 1 | uA | VIN=VCE=VOUT+1V | 5 | |
| 温度系数 (temperature coefficient) | △VOUT/(△Ta*VOUT) | -100 | 100 | ppm/℃ | VIN=VCE=VOUT+1V, IOUT=10mA, -40℃≤Ta≤85℃ | 5 | |
| 最大结温 (max junction temperature, absolute) | TJ(MAX) | 150 | °C | junction temperature, stated in text of section 9.2 | 6 | ||
| 推荐最大结温 (recommended max junction temperature) | TJ | 125 | °C | recommended for reliable normal operation, stated in text of section 9.2 | 6 | ||
| 结到环境热阻 (junction-to-ambient thermal resistance) | θJA | 500 | °C/W | SOT23-3L | 6 | ||
| 输出电流 (output current) | IOUT | 300 | mA | VIN=VCE=VOUT+1V | 4 | ||
| 最小压差 (dropout voltage) | VDROP | 150 | mV | VIN=VCE, IOUT=50mA, △VOUT=±2%*VOUT | 5 | ||
| 最小压差 (dropout voltage) | VDROP | 320 | mV | VIN=VCE, IOUT=100mA, △VOUT=±2%*VOUT | 5 | ||
| 纹波抑制比 (PSRR) | PSRR | 75 | dB | VIN=VCE=VOUT+1V, IOUT=10mA, f=100Hz | 5 | ||
| 纹波抑制比 (PSRR) | PSRR | 55 | dB | VIN=VCE=VOUT+1V, IOUT=10mA, f=1kHz | 5 | ||
| 纹波抑制比 (PSRR) | PSRR | 40 | dB | VIN=VCE=VOUT+1V, IOUT=10mA, f=10kHz | 5 | ||
| 短路电流 (short-circuit current) | ISCP | 30 | mA | VOUT=GND | 5 |
CAD (KiCad official)
- Symbol:
LR8103A-T33 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files:
lr8103a-t33-etched.step/lr8103a-t33-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr8103a-t33.step/lr8103a-t33.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LR datasheet (10 pp, sha256
1164d007f79e861e, 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).