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LM317AT

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Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

componentpower management (pmic)lm317atfactory-2.0.0extractor-text

Verified LM317AT

by Ray · last 5 Nov 2026 · 1 record · files match
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Verification log 1 record

5 Nov 2026RayPublished by the parts factory: tier mfr, 3 pinsfiles match
SymbolFootprint3D modelPinsfor all variants
  • ✓component-page-verify: PASS
  • ✓cad_props: Datasheet, MPN and distributor properties match page.json
  • ✓component: LM317AT · TO-220 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 46-page datasheet
  • ✓distributor: lcsc C94659, digikey LM317AT-ND, mouser 926-LM317AT
  • ✓family: TO-220-3_Vertical
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-2uh0_95l/x.lbr is a valid EAGLE .lbr with complete deviceset
  • ✓license: CC-BY-SA-4.0
  • ✓models_3d: 2 records
  • •package_fit (skip): no component.package_dims on the page: the model is unchecked against the datasheet drawing
  • ✓pads: 3 pins = 3 pads
  • ✓pose: 2 STEP(s) Z-up, seated, centred
  • ✓symbol: 3 pins agree
  • ✓symbol_text: no pin names collide
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lm317at.kicad_sym✓ lm317at.kicad_mod✓ lm317at.step
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Contents

README

markdown

LM317AT

Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220

LM317AT from Texas Instruments, in a TO-220. 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, with the output adjustable down to 1.25 V through an external resistor from the adjust pin to the output.
2 VOUT output Output voltage pin supplies 1.25 V to 37 V at over 1.5 A, and the tab is internally connected to this output.
3 VIN power_in Input voltage pin for the regulator, with an input-to-output differential of up to 40 V (absolute maximum −0.3 V to 40 V).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TO-220
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
Operating temperature -40 125 °C Operating free-air temperature range 5
Input-output voltage differential -0.3 40 V 5
Storage temperature Tstg -65 150 °C 5
Reference voltage VREF 1.238 1.25 1.262 V TJ = 25°C 6
Reference voltage VREF 1.225 1.25 1.27 V 3 V ≤ (VIN − VOUT) ≤ 40 V, 10 mA ≤ IOUT ≤ IMAX, over full operating temperature range 6
Line regulation 0.005 0.01 %/V 3 V ≤ (VIN − VOUT) ≤ 40 V, TJ = 25°C 6
Line regulation 0.01 0.02 %/V 3 V ≤ (VIN − VOUT) ≤ 40 V, over full operating temperature range 6
Load regulation 0.1 0.5 % 10 mA ≤ IOUT ≤ IMAX, TJ = 25°C 6
Load regulation 0.3 1 % 10 mA ≤ IOUT ≤ IMAX, over full operating temperature range 6
Thermal regulation 0.04 0.07 %/W 20-ms pulse 6
Adjustment pin current IADJ 50 100 μA over full operating temperature range 6
Adjustment pin current change ΔIADJ 0.2 5 μA 10 mA ≤ IOUT ≤ IMAX, 3 V ≤ (VIN − VOUT) ≤ 40 V, over full operating temperature range 6
Temperature stability 1 % TMIN ≤ TJ ≤ TMAX, over full operating temperature range 6
Minimum load current 3.5 10 mA (VIN − VOUT) = 40 V, over full operating temperature range 6
Current limit ILIM 1.5 2.2 3.4 A (VIN − VOUT) ≤ 15 V, SOT-223 and TO-220 packages, over full operating temperature range 6
Current limit ILIM 0.15 0.4 A (VIN − VOUT) = 40 V, SOT-223 and TO-220 packages 6
RMS output noise 0.003 % of VOUT 10 Hz ≤ f ≤ 10 kHz 6
Ripple rejection ratio 65 dB VOUT = 10 V, f = 120 Hz, CADJ = 0 μF, over full operating temperature range 6
Ripple rejection ratio 66 80 dB VOUT = 10 V, f = 120 Hz, CADJ = 10 μF, over full operating temperature range 6
Long-term stability 0.3 1 % TJ = 125°C, 1000 hrs 6
Junction-to-ambient thermal resistance (NDE TO-220) RθJA 23.3 °C/W 5
Junction-to-case (top) thermal resistance (NDE TO-220) RθJC(top) 16.2 °C/W 5
Junction-to-case (bottom) thermal resistance (NDE TO-220) RθJC(bot) 1.1 °C/W 5

CAD (KiCad official)

  • Symbol: LM317AT
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: lm317at-etched.step / lm317at-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317at.step / lm317at.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (46 pp, sha256 d9c37e85dc648c24, retrieved 2026-11-05, 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