# LP3879MRX-1.0

**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOIC-8-EP

LP3879MRX-1.0 from Texas Instruments, in a SOIC-8-EP. 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 | BYPASS | passive | The capacitor connected between BYPASS and GROUND lowers output noise voltage and is required for loop stability. |
| 2 | N/C | unconnected | DO NOT CONNECT; this pin is used for post package test and must be left floating. |
| 3 | GROUND | power_in | Device ground. |
| 4 | INPUT | power_in | Input source voltage. |
| 5 | OUTPUT | power_out | Regulated output voltage. |
| 6 | SENSE | input | Remote sense; tie directly to output or remotely at point of load for best regulation. |
| 7 | N/C | unconnected | No internal connection. |
| 8 | SHUTDOWN | input | Output is enabled above the turn-on threshold voltage; pull down to turn off the regulator output. |
| 9 | SUBSTRATE | power_in | The exposed die attach pad should be connected to a thermal pad at ground potential. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8-EP |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `LP3879MRX-1.0`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm`
- 3D model: SOIC-8-EP (KiCad packages3D, STEP)
- 3D model files: `lp3879mrx-1-0-etched.step` / `lp3879mrx-1-0-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp3879mrx-1-0.step` / `lp3879mrx-1-0.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/lp3879) (23 pp, sha256 `b437c2e749f1337e`, retrieved 2026-10-10, tier: lcsc)
- **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](docs/lp3879mrx-1-0-datasheet.pdf)