component
LP3871EMPX-3.3
Public Made by Adomby adom
Texas Instruments Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, SOT-223-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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LP3871EMPX-3.3
Texas Instruments · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-5
LP3871EMPX-3.3 from Texas Instruments, in a SOT-223-5. 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 | SD | input | Shutdown input: must be pulled high through a 10-kΩ pullup resistor for normal operation, and pulling it low puts the regulator in shutdown with about 10-nA quiescent current; shutdown input voltage is rated −0.3 V to 7 V. |
| 2 | IN | power_in | Input supply voltage: 2.5 V to 7 V recommended, with a minimum of VOUT(NOM) + VDROPOUT or 2.5 V, whichever is greater. |
| 3 | OUT | power_out | Regulated output voltage (3.3 V nominal for this variant), rated for a maximum DC output current of 0.8 A. |
| 4 | ERROR | output | ERROR flag output that goes low when the output voltage drops 10% below nominal; it must be pulled high through a 10-kΩ pullup resistor, or connected to ground if unused, and its maximum voltage is VIN. |
| 5 | GND | power_in | Ground reference pin for the regulator. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-223-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
CAD (KiCad official)
- Symbol:
LP3871EMPX-3.3 - Footprint:
Package_TO_SOT_SMD:SOT-223-5 - 3D model: SOT-223-5, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.45 mm nominal SOT height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
lp3871empx-3-3-etched.step/lp3871empx-3-3-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lp3871empx-3-3.step/lp3871empx-3-3.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (27 pp, sha256
b85de2cb47e9b1e2, retrieved 2026-10-08, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).
# LP3871EMPX-3.3
**Texas Instruments** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223-5
LP3871EMPX-3.3 from Texas Instruments, in a SOT-223-5. 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 | SD | input | Shutdown input: must be pulled high through a 10-kΩ pullup resistor for normal operation, and pulling it low puts the regulator in shutdown with about 10-nA quiescent current; shutdown input voltage is rated −0.3 V to 7 V. |
| 2 | IN | power_in | Input supply voltage: 2.5 V to 7 V recommended, with a minimum of VOUT(NOM) + VDROPOUT or 2.5 V, whichever is greater. |
| 3 | OUT | power_out | Regulated output voltage (3.3 V nominal for this variant), rated for a maximum DC output current of 0.8 A. |
| 4 | ERROR | output | ERROR flag output that goes low when the output voltage drops 10% below nominal; it must be pulled high through a 10-kΩ pullup resistor, or connected to ground if unused, and its maximum voltage is VIN. |
| 5 | GND | power_in | Ground reference pin for the regulator. |
## Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-223-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
## CAD (KiCad official)
- Symbol: `LP3871EMPX-3.3`
- Footprint: `Package_TO_SOT_SMD:SOT-223-5`
- 3D model: SOT-223-5, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.45 mm nominal SOT height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `lp3871empx-3-3-etched.step` / `lp3871empx-3-3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp3871empx-3-3.step` / `lp3871empx-3-3.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/lp3874) (27 pp, sha256 `b85de2cb47e9b1e2`, retrieved 2026-10-08, 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/lp3871empx-3-3-datasheet.pdf)