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LM317G-AA3-R

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UTC(Unisonic Tech) Linear Voltage Regulators (LDO), SOT-223. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM317G-AA3-R

UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · SOT-223

LM317G-AA3-R from UTC(Unisonic Tech), in a SOT-223. 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 ADJ passive Adjust pin sets the output voltage (1.3V to 37V); its current IADJ is 50 µA typical and 100 µA maximum, and CADJ is connected between this pin and ground.
2 VOUT power_out Regulated output, adjustable from 1.3V to 37V, with output current in excess of 1A; maximum output current is 0.2 A to 0.3 A at VIN-VOUT=40V with PD≤20W.
3 VIN power_in Unregulated input; the input-output voltage difference VIN-VOUT must not exceed 40V (absolute maximum).

Key specifications

Parameter Value
Manufacturer UTC(Unisonic Tech)
Package SOT-223
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
Input - Output Voltage Difference VIN-VOUT 40 V 3
Junction Temperature TJ 125 C 3
Operating Temperature TOPR -40 85 C 3
Storage Temperature TSTG -40 150 C 3
Line Regulation VOUT/VOUT 0.01 0.04 %/V 3V≦VIN-VOUT≦40V 3
Line Regulation VOUT 5 25 mV VOUT≦5V 3
Load Regulation VOUT 0.1 0.5 % 10mA≦IOUT≦1A, VOUT≧5V 3
Adjustable Pin Current IADJ 50 100 μA 3
Adjustable Pin Current Change IADJ 0.2 5 μA 3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W 3
Reference Voltage VREF 1.2 1.25 1.3 V 3V≦VIN-VOUT≦40V, 10mA≦IOUT≦1A, PD≦20W 3
Minimum Load Current for Regulation IL(MIN) 3.5 10 mA VIN-VOUT=40V 3
Maximum Output Current IO(MAX) 0.2 0.3 A VIN-VOUT=40V, PD≦20W 3
Ripple Rejection RR 66 80 dB VOUT=10V,f=120HZ CADJ=10μF 3
Ripple Rejection RR 65 dB VOUT=10V,f=120HZ CADJ=0 3
Temperature Stability 0.7 %/VOUT TMIN≦TJ≦TMAX 3
RMS Noise vs. % of VOUT eN 0.003 %/VOUT 10HZ≦f≦10KHZ 3
Junction-to-Ambient Thermal Resistance (SOT-223) θJA 165 C/W 3
Junction-to-Case Thermal Resistance (SOT-223) θJC 23 C/W 3

CAD (KiCad official)

  • Symbol: LM317G-AA3-R
  • Footprint: Package_TO_SOT_SMD:SOT-223-3_TabPin2
  • 3D model: SOT-223 (KiCad packages3D, STEP)
  • 3D model files: lm317g-aa3-r-etched.step / lm317g-aa3-r-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317g-aa3-r.step / lm317g-aa3-r.glb are the bare package body.

Provenance

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

  • Datasheet: UTC(Unisonic Tech) datasheet (5 pp, sha256 14286ff814b58d10, retrieved 2026-10-22, tier: manufacturer)
  • 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