component

LM317AMDT

Public Made by Adom

by adom

HGSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-252-2. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM317AMDT

HGSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-252-2

LM317AMDT from HGSEMI, in a TO-252-2. 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 Adjustment terminal (调节); the device holds the adjust current Iadj below 100 µA and constant, so the output voltage is set by the external resistor divider returned to this pin.
2 VOUT power_out Regulated output (输出) of the 1.2 V to 37 V adjustable regulator, rated up to 1.5 A maximum output current.
3 Vin power_in Unregulated input supply (输入电源); the input-to-output differential must stay within 40 V (VI-VO maximum).

Key specifications

Parameter Value
Manufacturer HGSEMI
Package TO-252-2
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
Reference voltage (set of rows as printed, variant not labeled) Vref 1.238 1.25 1.262 V 3V≤(VIN−VOUT)≤40V, 10mA≤IOUT≤IMAX, P≤PMAX 3
Reference voltage (second row, wider range) Vref 1.2 1.25 1.3 V 3V≤(VIN−VOUT)≤40V, 10mA≤IOUT≤IMAX, P≤PMAX 3
Line regulation Regline 0.01 0.04 %/V 3V≤(VIN−VOUT)≤40V 3
Line regulation (second row) Regline 0.01 0.07 %/V 3V≤(VIN−VOUT)≤40V 3
Load regulation Regload 0.1 0.5 % 10 mA≤IOUT≤IMAX 3
Load regulation (second row) Regload 0.3 1.5 % 10 mA≤IOUT≤IMAX 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, 10mA≤IOUT≤IMAX 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
Ripple rejection RR 66 80 dB VOUT=10V, f=12 Hz, CADJ=10 μF 3
Input-output voltage differential VI-VO 40 V 3
Output current IOUT 1.5 A 3
Operating junction temperature TJ -40 125 °C 3
Storage temperature TS -65 150 °C 3
Operating temperature (LM317A grade) TA -40 85 °C LM317A 3
Lead temperature (soldering 10 s), TO-252/SOT223 TLEAD 260 °C TO-252/SOT223, soldering 10 s 3

CAD (KiCad official)

  • Symbol: LM317AMDT
  • Footprint: Package_TO_SOT_SMD:TO-252-2
  • 3D model: TO-252-2 (KiCad packages3D, STEP)
  • 3D model files: lm317amdt-etched.step / lm317amdt-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317amdt.step / lm317amdt.glb are the bare package body.

Provenance

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

  • Datasheet: HGSEMI datasheet (10 pp, sha256 d9a555a6ac04206b, 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