component
LR8321A-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
markdownLR8321A-T33
LR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L
LR8321A-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 pin; the datasheet states that all voltages are referenced to GND unless otherwise noted. |
| 2 | VOUT | power_out | Output voltage pin; the LR8321A-T33 regulates a fixed 3.3V output and supplies up to 100mA typical, with a 150mA absolute maximum output current. |
| 3 | VIN | power_in | Input voltage pin; the maximum input voltage is 24V in the electrical characteristics (32V absolute maximum), and a bypass capacitor of at least 1µF ceramic is recommended on this 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 |
|---|---|---|---|---|---|---|---|
| Maximum input supply voltage | VIN | 32 | V | 4 | |||
| Input voltage | VIN | 24 | V | ISS=5uA | 4 | ||
| Output voltage accuracy | VOUT | -2 | 2 | % | VIN=VOUT+2V，IOUT=10mA | 4 | |
| Line regulation | ΔVOUT | -30 | 30 | mV | VOUT+2V≤VIN≤24V，IOUT=5mA | 4 | |
| Load regulation | ΔVOUT | -50 | 50 | mV | VIN= VOUT+2V，1mA≤IOUT≤100mA | 4 | |
| Minimum dropout voltage | VDrop | 320 | 390 | 450 | mV | IOUT=50mA，ΔVOUT=±2%*VOUT | 4 |
| Minimum dropout voltage | VDrop | 600 | 750 | 900 | mV | IOUT=100mA，ΔVOUT=±2%*VOUT | 4 |
| Quiescent current | ISS | 1.5 | 5 | uA | VIN= VOUT+2V | 5 | |
| Output voltage temperature coefficient | ΔVOUT/(ΔTa*VOUT) | -100 | 50 | 100 | ppm/℃ | VIN= VOUT+2V，IOUT=10mA, -40℃≤Ta≤85℃ | 5 |
| Power dissipation (SOT23-3L) | PD | 250 | mW | SOT23-3L package | 4 | ||
| Maximum output current | IOUT | 150 | mA | 4 | |||
| ESD human body model (H.B.M POS/NEG) | -3000 | 3000 | V | H.B.M POS/NEG; printed as ±3000 V | 4 | ||
| Operating temperature | TOPR | -40 | 105 | ℃ | 4 | ||
| Storage temperature | TSTG | -40 | 125 | ℃ | 4 | ||
| Maximum junction temperature | TJ(MAX) | 150 | ℃ | Absolute maximum operating limit | 8 | ||
| Recommended maximum operating junction temperature | 125 | ℃ | Normal operation, for reliability | 8 | |||
| Input capacitor (recommended minimum, ceramic) | CIN | 1 | μF | Ceramic capacitor recommended for input | 8 | ||
| Output capacitor (recommended minimum, ceramic) | COUT | 1 | μF | Ceramic capacitor recommended for output | 8 | ||
| Thermal resistance, junction to ambient (SOT23-3L) | θJA | 500 | °C/W | SOT23-3L package | 8 |
CAD (KiCad official)
- Symbol:
LR8321A-T33 - Footprint:
Package_TO_SOT_SMD:SOT-23-3 - 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files:
lr8321a-t33-etched.step/lr8321a-t33-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lr8321a-t33.step/lr8321a-t33.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: LR datasheet (12 pp, sha256
75e1ff006d959d36, retrieved 2026-10-14, 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).