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LM317S2

Public Made by Adom

by adom

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

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LM317S2

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

LM317S2 from HGSEMI, in a TO-263-2L. 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 voltage through the R1/R2 divider, with adjust current IAdj typically 50 µA and at most 100 µA, held constant by design.
2 VOUT power_out Regulated output terminal; output voltage range is 1.2 V to 37 V with output current up to 1.5 A (IMAX).
3 Vin power_in Unregulated input supply terminal; the input-to-output differential VI-VO must not exceed 40 V.

Key specifications

Parameter Value
Manufacturer HGSEMI
Package TO-263-2L
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
Input-output differential voltage VI-VO 40 V 3
Output current IOUT 1.5 A 3
Operating junction temperature TJ -40 125 ℃ 3
Storage temperature TS -65 150 ℃ 3
Operating temperature (LM317 grade) TA 0 70 ℃ LM317 grade (LM317A is -40~85, sibling not listed) 3
Lead temperature, soldering 10 s TLEAD 245 ℃ TO-220/TO-263, 10 s soldering 3
Reference voltage Vref 1.238 1.25 1.262 V 3V≤ (VIN − VOUT) ≤40V , 10 mA ≤IOUT ≤IMAX, P ≤PMAX 3
Reference voltage (second printed row) Vref 1.2 1.25 1.3 V 3
Line regulation Regline 0.01 0.04 %/V 3V≤ (VIN − VOUT) ≤40V 3
Line regulation (second printed row) Regline 0.01 0.07 %/V 3
Load regulation Regload 0.1 0.5 % 10 mA ≤IOUT ≤IMAX 3
Load regulation (second printed row) Regload 0.3 1.5 % 3
Thermal regulation Reftherm 0.04 0.07 %/W 3
Adjust pin current IAdj 50 100 μA 3
Adjust pin current change ΔIAdj 0.2 5 μA 3V≤ (VIN − VOUT) ≤40V , 10 mA ≤IOUT ≤IMAX 3
Temperature stability TS 1 % TMIN ≤TJ ≤TMAX 3
Minimum load current to maintain regulation ILmin 3.5 10 mA (VIN − VOUT) = 40V 3
Maximum output current Imax 1 1.95 A (VIN − VOUT) ≤15V, T package 3
Maximum output current Imax 0.4 A (VIN − VOUT) = 40V, T package 3
RMS noise N 0.003 % 10 Hz ≤f ≤10 kHz 3
Ripple rejection RR 65 dB VOUT=10V, f=120 Hz, CADJ=0 μF 3
Ripple rejection (second printed row) RR 66 80 dB 3

CAD (KiCad official)

  • Symbol: LM317S2
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-2L (KiCad packages3D, STEP)
  • 3D model files: lm317s2-etched.step / lm317s2-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317s2.step / lm317s2.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (10 pp, sha256 3d7f9c7444e7fa24, retrieved 2026-10-18, tier: lcsc)
  • Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
  • 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