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LM109H

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

componentpower management (pmic)lm109hfactory-2.0.0extractor-text
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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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LM109H

Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-3

LM109H from Texas Instruments, in a TO-3. 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 INPUT power_in Unregulated input voltage, absolute maximum 35V, operating 7.40V to 25V, bypass with at least 0.2 µF to ground if the main filter capacitor is more than 4 inches away.
2 OUTPUT power_out Regulated 5V output (4.7V to 5.3V for LM109 at Tj = 25°C) delivering more than 200 mA for the TO-39 package (IMAX = 0.2A), with no output capacitor required for stability.
3 GND power_in Ground pin, electrically connected to the case.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package TO-3
Category Power Management (PMIC)
Pins 3

CAD (KiCad official)

  • Symbol: LM109H
  • Footprint: Package_TO_SOT_THT:TO-3
  • 3D model: TO-3 (KiCad packages3D, STEP)
  • 3D model files: lm109h-etched.step / lm109h-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm109h.step / lm109h.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (13 pp, sha256 4411b11c07ed19a1, retrieved 2026-10-08, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text+vision), consensus claude-opus-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