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LM317BTG

Public Made by Adom

by adom

onsemi 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)lm317btgfactory-2.0.0extractor-text
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Symbol & Footprint

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Datasheet

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Contents

README

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LM317BTG

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

LM317BTG from onsemi, 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 Adjust passive Adjustment terminal that sets the output through the R1/R2 divider; the LM317 is designed to hold IAdj below 100 µA (50 µA typical).
2 Vout power_out Regulated output, which delivers up to 1.5 A (Imax) over an output range of 1.2 V to 37 V; the heatsink tab is connected to this pin.
3 Vin power_in Unregulated input; the input-output voltage differential must stay within -0.3 to 40 Vdc per the maximum ratings.

Key specifications

Parameter Value
Manufacturer onsemi
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
Line Regulation (B grade, Tlow to Thigh) Regline 0.02 0.07 %/V 3.0 V ≤ VI−VO ≤ 40 V 2
Load Regulation, VO ≤ 5.0 V (B grade) Regload 20 70 mV 10 mA ≤ IO ≤ Imax, VO ≤ 5.0 V 2
Load Regulation, VO ≥ 5.0 V (B grade) Regload 0.3 1.5 % VO 10 mA ≤ IO ≤ Imax, VO ≥ 5.0 V 2
Thermal Regulation Regtherm 0.03 0.07 % VO/W TA = +25°C, 20 ms Pulse 2
Adjustment Pin Current IAdj 50 100 µA 2
Adjustment Pin Current Change IAdj 0.2 5 µA 2.5 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IL ≤ Imax, PD ≤ Pmax 2
Reference Voltage Vref 1.2 1.25 1.3 V 3.0 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IO ≤ Imax, PD ≤ Pmax 2
Minimum Load Current to Maintain Regulation ILmin 3.5 10 mA VI−VO = 40 V 2
Maximum Output Current (T package) Imax 1.5 2.2 A VI−VO ≤ 15 V, PD ≤ Pmax 2
Maximum Output Current (T package) Imax 0.15 0.4 A VI−VO = 40 V, PD ≤ Pmax, TA = +25°C 2
Long-Term Stability S 0.3 1 %/1.0 kHrs. TJ = Thigh, TA = +25°C for endpoint measurements 2
Input-Output Voltage Differential VI−VO -0.3 40 Vdc 2
Operating Junction Temperature Range TJ -55 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Thermal Resistance, Junction-to-Ambient (Case 221A, TO-220) θJA 65 °C/W Case 221A, TO-220 2
Thermal Resistance, Junction-to-Case (Case 221A, TO-220) θJC 5 °C/W Case 221A, TO-220 2

CAD (KiCad official)

  • Symbol: LM317BTG
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: lm317btg-etched.step / lm317btg-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317btg.step / lm317btg.glb are the bare package body.

Provenance

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

  • Datasheet: onsemi datasheet (12 pp, sha256 752b2a8373998f8d, retrieved 2026-10-19, tier: lcsc)
  • 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