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LM317BD2TR4G

Public Made by Adom

by adom

onsemi Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-2. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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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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LM317BD2TR4G

onsemi · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2

LM317BD2TR4G from onsemi, in a TO-263-2. 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 The adjustment terminal sets the output voltage through the external R1/R2 divider, with adjust current IAdj controlled to less than 100 µA, and it may be bypassed to ground with a CAdj (for example 10 µF) to improve ripple rejection.
2 Vout power_out This is the regulated output, which is adjustable from 1.2 V to 37 V and is electrically connected to the heatsink surface of the package.
3 Vin power_in This is the unregulated input, with an input-output differential rating of −0.3 V to 40 Vdc and regulation specified for 3.0 V ≤ VI−VO ≤ 40 V.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-263-2
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 (Note 3), TA = +25°C, 3.0 V ≤ VI−VO ≤ 40 V Regline 0.01 0.04 %/V TA = +25°C, 3.0 V ≤ VI−VO ≤ 40 V 2
Load Regulation (Note 3), VO ≤ 5.0 V Regload 5 25 mV TA = +25°C, 10 mA ≤ IO ≤ Imax 2
Load Regulation (Note 3), VO ≥ 5.0 V Regload 0.1 0.5 % VO TA = +25°C, 10 mA ≤ IO ≤ Imax 2
Thermal Regulation, 20 ms Pulse Regtherm 0.03 0.07 % VO/W TA = +25°C (Note 4), 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
Line Regulation (Note 3) Regline 0.02 0.07 % V 3.0 V ≤ VI−VO ≤ 40 V 2
Load Regulation (Note 3), VO ≤ 5.0 V Regload 20 70 mV 10 mA ≤ IO ≤ Imax 2
Load Regulation (Note 3), VO ≥ 5.0 V Regload 0.3 1.5 % VO 10 mA ≤ IO ≤ Imax 2
Minimum Load Current to Maintain Regulation ILmin 3.5 10 mA VI−VO = 40 V 2
Maximum Output Current Imax 1.5 2.2 A VI−VO ≤ 15 V, PD ≤ Pmax, T Package 2
Maximum Output Current Imax 0.15 0.4 A VI−VO = 40 V, PD ≤ Pmax, TA = +25°C, T Package 2
Long-Term Stability S 0.3 1 %/1.0 kHrs. TJ = Thigh (Note 7), TA = +25°C for Endpoint Measurements 2
Input-Output Voltage Differential VI−VO -0.3 40 Vdc 2
Thermal Resistance, Junction-to-Ambient (Case 936, D2PAK-3) JA 70 °C/W Case 936 (D2PAK-3) 2
Thermal Resistance, Junction-to-Case (Case 936, D2PAK-3) JC 5 °C/W Case 936 (D2PAK-3) 2
Operating Junction Temperature Range TJ -55 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2

CAD (KiCad official)

  • Symbol: LM317BD2TR4G
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-2 (KiCad packages3D, STEP)
  • 3D model files: lm317bd2tr4g-etched.step / lm317bd2tr4g-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317bd2tr4g.step / lm317bd2tr4g.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 2026-10-09, 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