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LM317BT

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

componentpower management (pmic)lm317btfactory-2.0.0extractor-text

Verified LM317BT

by Ray · last 2 Nov 2026 · 1 record · files match
SymbolFootprint3D modelPins

Verification log 1 record

2 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: LM317BT · TO-220-3 · 3 pins
  • ✓copper: 3 copper pads, none touching another net
  • ✓datasheet: all 3 pin names found in the 34-page datasheet
  • ✓distributor: lcsc C2969918, digikey LM317BTOS-ND, mouser 511-LM317BT
  • ✓family: TO-220-3_Vertical
  • ✓files: 7 declared files present
  • ✓hero: docs/hero.png 4000x2500
  • ✓lbr: OK: /tmp/cpv-zjr5du8s/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
  • ✓visibility: public, source open
Evidencedatasheet
Verified files✓ lm317bt.kicad_sym✓ lm317bt.kicad_mod✓ lm317bt.step
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3D Model

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Symbol & Footprint

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Datasheet

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Contents

README

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LM317BT

STMicroelectronics · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-220-3

LM317BT from STMicroelectronics, in a TO-220-3. 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 ADJUST input Adjustment terminal sets the output voltage through the external resistor divider, with adjustment pin current IADJ of 100 µA max.
2 OUTPUT output Regulated output delivers more than 1.5 A of load current, with IO(max) of 1.5 A minimum over the specified conditions.
3 INPUT power_in Unregulated input supply; the input-to-output differential voltage must not exceed the 40 V absolute maximum.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-220-3
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
Line regulation ΔVO 0.01 0.04 %/V VI - VO = 3 to 40 V, TJ = 25°C 7
Line regulation ΔVO 0.02 0.07 %/V VI - VO = 3 to 40 V 7
Load regulation ΔVO 5 25 mV VO ≤ 5 V, IO = 10 mA to IMAX, TJ = 25°C 7
Load regulation ΔVO 20 70 mV VO ≤ 5 V, IO = 10 mA to IMAX 7
Load regulation ΔVO 0.1 0.5 % VO ≥ 5 V, IO = 10 mA to IMAX, TJ = 25°C 7
Load regulation ΔVO 0.3 1.5 % VO ≥ 5 V, IO = 10 mA to IMAX 7
Adjustment pin current IADJ 50 100 µA 7
Adjustment pin current change ΔIADJ 0.2 5 µA VI - VO = 2.5 to 40 V, IO = 10 mA to 500 mA 7
Reference voltage VREF 1.2 1.25 1.3 V VI - VO = 2.5 to 40 V, IO = 10 mA to 500 mA, PD ≤ PMAX 7
Output voltage temperature stability ΔVO/VO 1 % 7
Minimum load current IO(min) 3.5 10 mA VI - VO = 40 V 7
Maximum load current IO(max) 1.5 2.2 A VI - VO ≤ 15 V, PD < PMAX 7
Maximum load current IO(max) 0.4 A VI - VO = 40 V, PD < PMAX, TJ = 25°C 7
Output noise voltage (percentage of VO) eN 0.003 % B = 10 Hz to 100 kHz, TJ = 25°C 7
Supply voltage rejection SVR 65 dB TJ = 25°C, f = 120 Hz, CADJ = 0 7
Supply voltage rejection SVR 66 80 dB TJ = 25°C, f = 120 Hz, CADJ = 10 µF 7
Operating junction temperature TOP -40 125 °C LM317B 3
Input-reference differential voltage VI - VO 40 V 3
Storage temperature TSTG -65 150 °C 3
Thermal resistance junction-ambient RthJA 50 °C/W TO-220 package 3
Thermal resistance junction-case RthJC 5 °C/W TO-220 package 3

CAD (KiCad official)

  • Symbol: LM317BT
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220-3 (KiCad packages3D, STEP)
  • 3D model files: lm317bt-etched.step / lm317bt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317bt.step / lm317bt.glb are the bare package body.

Provenance

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

  • Datasheet: STMicroelectronics datasheet (34 pp, sha256 22e0a613ceff898c, retrieved 2026-11-02, 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