component
LM109H
Public Made by Adomby adom
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.
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
markdownLM109H
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.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm109h.step/lm109h.glbare 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, primaryclaude-sonnet-5-5(text+vision), consensusclaude-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).