component
LM317AEMPX
Public Made by Adomby adom
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Datasheet-verified pinout, 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
markdownLM317AEMPX
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4
LM317AEMPX from Texas Instruments, in a SOT-223-4. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ADJ | input | Adjustment pin connected to external resistor network for programming output voltage; adjustment pin current is 50-100 μA over full operating temperature range. |
| 2 | VOUT | power_out | Regulated output voltage pin providing 1.25 V to 37 V output with 1.5 A (minimum) to 3.4 A (maximum) current limit over full operating temperature range. |
| 3 | VIN | power_in | Input voltage supply pin accepting 4.25 V to 40 V input supply with maximum input-to-output differential voltage of 40 V. |
| 4 | VOUT | power_out | Output voltage heatsink tab pad (electrically connected to Pin 2) for thermal dissipation and output current distribution. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-223-4 |
| Category | Power Management (PMIC) |
| Pins | 4 |
CAD (KiCad official)
- Symbol:
LM317AEMPX - Footprint:
Package_TO_SOT_SMD:SOT-223 - 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files:
lm317aempx-etched.step/lm317aempx-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm317aempx.step/lm317aempx.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (45 pp, sha256
e52ccc9532460319, retrieved 2026-09-22, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).