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LR8321A-T50

Public Made by Adom

by 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.

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LR8321A-T50

LR · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-23-3L

LR8321A-T50 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 pin; the datasheet states that all voltages are specified relative to GND unless otherwise noted.
2 VOUT power_out Regulated output voltage pin; for the LR8321A-T50 the fixed output is 5.0V (VOUT0.98 to VOUT1.02 at 10mA), with output current rated to 100mA and OCP set to 120mA.
3 VIN power_in Input voltage pin; the input voltage is rated to 24V in the electrical characteristics (32V maximum absolute rating), and at least a 1µF ceramic input bypass capacitor is recommended.

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
Maximum output current IOUT 150 mA 4
Power dissipation PD 250 mW SOT23-3L 4
Operating temperature TOPR -40 105 °C 4
Storage temperature TSTG -40 125 °C 4
ESD HBM -3000 3000 V H.B.M POS/NEG 4
Input voltage VIN 24 V ISS=5uA 4
Output voltage accuracy VOUT -2 2 % 1
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
Dropout voltage VDrop 320 390 450 mV IOUT=50mA, ΔVOUT=±2%*VOUT 4
Dropout voltage VDrop 600 750 900 mV IOUT=100mA, ΔVOUT=±2%*VOUT 4
Quiescent current ISS 1.5 5 uA VIN=VOUT+2V 5
Temperature coefficient ΔVOUT/(ΔTa*VOUT) -100 50 100 ppm/℃ VIN=VOUT+2V, IOUT=10mA, -40℃≤Ta≤85℃ 5
Maximum junction temperature (absolute limit) TJ(MAX) 150 °C 8
Maximum junction temperature (recommended, normal operation) TJ 125 °C recommended for normal operation 8
Output voltage VOUT 5 V VIN=VOUT+2V, IOUT=10mA 4
Output current IOUT 100 mA VIN=VOUT+2V 4
Ripple rejection PSRR 75 dB VIN=VOUT+2V, IOUT=10mA, f=100Hz 5
Ripple rejection PSRR 55 dB VIN=VOUT+2V, IOUT=10mA, f=1kHz 5
Ripple rejection PSRR 40 dB VIN=VOUT+2V, IOUT=10mA, f=10kHz 5
Short-circuit current ISCP 20 mA VOUT=GND 5
Overcurrent protection current IOCP 120 mA 5
Thermal resistance junction-to-ambient θJA 500 °C/W SOT23-3L 8

CAD (KiCad official)

  • Symbol: LR8321A-T50
  • Footprint: Package_TO_SOT_SMD:SOT-23-3
  • 3D model: SOT-23-3L (KiCad packages3D, STEP)
  • 3D model files: lr8321a-t50-etched.step / lr8321a-t50-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lr8321a-t50.step / lr8321a-t50.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: LR datasheet (12 pp, sha256 75e1ff006d959d36, retrieved 2026-10-17, 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