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LM317AG-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.
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
markdownLM317AG-AA3-R
UTC(Unisonic Tech) · Linear Voltage Regulators (LDO) · SOT-223
LM317AG-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 output voltage via R1/R2 divider (VOUT=1.25V×(1+R2/R1)+IADJ×R2), with adjustable pin current of 50 µA typ to 100 µA max. |
| 2 | VOUT | power_out | Regulated output pin, adjustable from 1.2V to 37V, supplying output current in excess of 1.5A. |
| 3 | VIN | power_in | Unregulated input pin; input-output voltage differential must not exceed 40V. |
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 |
|---|---|---|---|---|---|---|---|
| Line Regulation | ΔVOUT/VOUT | 0.01 | 0.04 | %/V | 3V≤VIN-VOUT≤40V, IOUT=100mA | 3 | |
| Load Regulation (VOUT≤5V) | ΔVOUT | 5 | 25 | mV | 10mA≤IOUT≤1.5A, VOUT≤5V | 3 | |
| Load Regulation (VOUT≥5V) | ΔVOUT | 0.1 | 0.5 | % | 10mA≤IOUT≤1.5A, VOUT≥5V | 3 | |
| Adjustable Pin Current | IADJ | 50 | 100 | μA | 3 | ||
| Adjustable Pin Current Change | ΔIADJ | 0.2 | 5 | μA | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤500mA | 3 | |
| Reference Voltage | VREF | 1.2 | 1.25 | 1.3 | V | 3V≤VIN-VOUT≤40V, 10mA≤IOUT≤1.5A, PD<PMAX | 3 |
| Minimum Load Current for Regulation | IL(MIN) | 4.5 | mA | VIN-VOUT=40V | 3 | ||
| Maximum Output Current | IO(MAX) | 0.4 | A | VIN-VOUT=40V, PD≤PMAX | 3 | ||
| Maximum Output Current | IO(MAX) | 1.5 | 2.2 | A | VIN-VOUT=15V, PD<PMAX | 3 | |
| Ripple Rejection | RR | 65 | dB | VOUT=10V, f=120HZ, CADJ=0 | 3 | ||
| Ripple Rejection | RR | 66 | 80 | dB | VOUT=10V, f=120HZ, CADJ=10μF | 3 | |
| Input-Output Voltage Differential | VIN-VOUT | 40 | V | 3 | |||
| Junction Temperature | TJ | 125 | °C | 3 | |||
| Operating Temperature | TOPR | -40 | 85 | °C | 3 | ||
| Storage Temperature | TSTG | -65 | 150 | °C | 3 | ||
| Thermal Resistance Junction to Ambient | θJA | 140 | °C/W | SOT-223 | 3 | ||
| Thermal Resistance Junction to Case | θJC | 23.5 | °C/W | SOT-223 | 3 | ||
| Temperature Stability | 0.7 | %/VOUT | TMIN≤TJ≤TMAX | 3 | |||
| RMS Noise vs. % of VOUT | eN | 0.003 | %/VOUT | 10HZ≤f≤10KHZ | 3 |
CAD (KiCad official)
- Symbol:
LM317AG-AA3-R - Footprint:
Package_TO_SOT_SMD:SOT-223-3_TabPin2 - 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files:
lm317ag-aa3-r-etched.step/lm317ag-aa3-r-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317ag-aa3-r.step/lm317ag-aa3-r.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: UTC(Unisonic Tech) datasheet (5 pp, sha256
6241b5d220aea876, retrieved 2026-10-22, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-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).