component
LM317S2
Public Made by Adomby 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.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLM317S2
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317s2.step/lm317s2.glbare 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, primaryclaude-haiku-5-5(text), consensusclaude-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).