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REG1117A

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Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-4. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Made with KiCad 10.0 · needs KiCad 10.0 or later to open · KiCad file format 20260206
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docs reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
viewers reg1117a: viewers · Ray 24d ago
package.json reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
page.json reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
README.md Publish 0.1.0 · Ray 24d ago
reg1117a-etched.glb reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
reg1117a-etched.step reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
reg1117a-hero.glb reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
reg1117a-hero.overlay.json reg1117a: etch along the lead row, tab up; full MPN text (service-occt 1.9.3) (service-occt 1.6.0, from the plain STEP) · Ray 17d ago
reg1117a.glb Publish 0.1.0 · Ray 24d ago
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REG1117A

Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-4

REG1117A from Texas Instruments, in a SOT-223-4. 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 GND/ADJ power_in Ground reference for fixed-voltage models; on the adjustable REG1117A this pin is the ADJ node, where R1 and R2 set the output voltage with a 1.25V reference, and adjust pin current is 50µA typ and 120µA max.
2 VOUT power_out Regulated output that supplies up to 1A (REG1117A) and needs an output capacitor, with a 10µF tantalum recommended and ESR below 0.5Ω.
3 VIN power_in Unregulated input supply with an absolute maximum of +15V, requiring at least about 1.3V above VOUT at 1A for regulation (REG1117A dropout 1.3V max).
4 TAB power_out Mounting tab electrically connected to VOUT, which must be soldered to adequate board copper because it provides the main heat-sinking path (JA about 59°C/W without backside copper).

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOT-223-4
Category Power Management (PMIC)
Pins 4

CAD (KiCad official)

  • Symbol: REG1117A
  • Footprint: Package_TO_SOT_SMD:SOT-223
  • 3D model: SOT-223-4 (KiCad packages3D, STEP)
  • 3D model files: reg1117a-etched.step / reg1117a-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); reg1117a.step / reg1117a.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (23 pp, sha256 9612deef2bd34399, retrieved 2026-10-09, tier: manufacturer)
  • 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