component
LM317ST
Public Made by Adomby adom
PJSEMI Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223. 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
markdownLM317ST
PJSEMI · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223
LM317ST from PJSEMI, in a SOT-223. 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 | FB | passive | Output feedback voltage pin (the adjustment/sense terminal) that sets the output through the external resistor divider, with the datasheet giving Iadj under 100 µA and a typical 1.25 V reference between output and adjust. |
| 2 | VOUT | power_out | Regulated output voltage pin, rated for up to 1.5 A output current (internally limited), and the datasheet notes that a minimum load current of 10 mA is needed to maintain regulation. |
| 3 | VIN | power_in | Power input pin; the input-output voltage differential must stay between 3 V and 37 V in recommended operation, with absolute maximum of -0.3 V to +40 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | PJSEMI |
| Package | SOT-223 |
| Category | Power Management (PMIC) |
| Pins | 3 |
CAD (KiCad official)
- Symbol:
LM317ST - Footprint:
Package_TO_SOT_SMD:SOT-223-3_TabPin2 - 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files:
lm317st-etched.step/lm317st-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317st.step/lm317st.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: PJSEMI datasheet (11 pp, sha256
15d37c7c3105c91b, retrieved 2026-10-09, tier: lcsc) - 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).