component
LR7544-T
Public Made by Adomby adom
LR Linear Voltage Regulators (LDO), SOT-23. 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
markdownLR7544-T
LR · Linear Voltage Regulators (LDO) · SOT-23
LR7544-T from LR, in a SOT-23. 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 | VSS | power_in | Ground pin (VSS/GND) of the regulator, the reference for all voltage values. |
| 2 | VOUT | power_out | Regulated 4.4V output (±2%) delivering 100mA typical, with a 1-10uF output capacitor recommended. |
| 3 | VIN | power_in | Supply input accepting up to 24V operating (32V absolute maximum), with an input bypass capacitor of 1-10uF recommended. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | LR |
| Package | SOT-23 |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Output Voltage Tolerance | VOUT | -2 | 2 | % | VIN=VOUT+2V, IOUT=10mA | 5 | |
| Input Voltage | VIN | 24 | V | ISS=5uA | 5 | ||
| Line Regulation | △VOUT | -30 | 30 | mV | VOUT+2V≤VIN≤24V, IOUT=5mA | 5 | |
| Load Regulation | △VOUT | -50 | 50 | mV | VIN=VOUT+2V, 1mA≤IOUT≤100mA | 5 | |
| Dropout Voltage at 50mA | VDrop | 320 | 390 | 450 | mV | IOUT=50mA, △VOUT=±2%*VOUT | 5 |
| Dropout Voltage at 100mA | VDrop | 600 | 750 | 900 | mV | IOUT=100mA, △VOUT=±2%*VOUT | 5 |
| Quiescent Current | ISS | 1.5 | 5 | uA | VIN=VOUT+2V | 5 | |
| Temperature Coefficient | △VOUT/(△Ta*VOUT) | -100 | 100 | ppm/℃ | VIN=VOUT+2V, IOUT=10mA, -40℃≤Ta≤85℃ | 5 | |
| Maximum Input Voltage | VIN | 32 | V | 4 | |||
| Maximum Output Current | IOUT | 150 | mA | 4 | |||
| Power Dissipation SOT23B | PD | 250 | mW | SOT23B | 4 | ||
| Operating Temperature | TOPR | -40 | 105 | ℃ | 4 | ||
| Storage Temperature | TSTG | -40 | 125 | ℃ | 4 | ||
| ESD HBM | -3000 | 3000 | V | H.B.M POS/NEG | 4 | ||
| Thermal Resistance Junction-Ambient SOT23-3L | θJA | 500 | °C/W | SOT23-3L | 8 | ||
| Output Current | IOUT | 100 | mA | VIN=VOUT+2V | 5 | ||
| PSRR 100Hz | PSRR | 75 | dB | VIN=VOUT+2V, IOUT=10mA, f=100Hz | 5 | ||
| PSRR 1kHz | PSRR | 55 | dB | VIN=VOUT+2V, IOUT=10mA, f=1kHz | 5 | ||
| PSRR 10kHz | PSRR | 40 | dB | VIN=VOUT+2V, IOUT=10mA, f=10kHz | 5 | ||
| Short-circuit Current | ISCP | 20 | mA | VOUT=GND | 5 | ||
| Over Current | IOCP | 120 | mA | 5 |
CAD (KiCad official)
- Symbol:
LR7544-T - Footprint:
Package_TO_SOT_SMD:SOT-23 - 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files:
lr7544-t-etched.step/lr7544-t-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr7544-t.step/lr7544-t.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LR datasheet (13 pp, sha256
0b58c65ef75e4ef4, retrieved 2026-10-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-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).