# LP3981IMM-3.03

**Texas Instruments** · Linear Voltage Regulators (LDO) · VSSOP-8

LP3981IMM-3.03 from Texas Instruments, in a VSSOP-8. 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 | OUT | power_out | Output voltage of the LDO, rated for 300-mA output current with the datasheet's maximum OUT/OUT-SENSE voltage of VIN + 0.3 V (6.5 V absolute maximum). |
| 2 | IN | power_in | Input voltage of the LDO, specified for 2.7 V to 6 V recommended operation with an absolute maximum of 6.5 V. |
| 3 | NC | unconnected | No internal connection. |
| 4 | OUT-SENSE | output | Voltage sense pin that must be connected to OUT for proper operation. |
| 5 | GND | power_in | Common ground pin; the datasheet's 'connect to PAD' note refers to the WSON thermal pad and does not apply to the VSSOP package. |
| 6 | BYPASS | passive | Optional bypass capacitor connection for noise reduction, connected to a high-impedance reference node so DC leakage on this pin must be kept low. |
| 7 | EN | input | Enable input logic, enable high; recommended range is 0 V to VIN. |
| 8 | NC | unconnected | No internal connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VSSOP-8 |
| Category | Power Supply Chip |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LP3981IMM-3.03`
- Footprint: `Package_SO:VSSOP-8_2.3x2mm_P0.5mm`
- 3D model: VSSOP-8 (KiCad packages3D, STEP)
- 3D model files: `lp3981imm-3-03-etched.step` / `lp3981imm-3-03-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp3981imm-3-03.step` / `lp3981imm-3-03.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/lp3981) (27 pp, sha256 `f55a271103f3d9d3`, 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/lp3981imm-3-03-datasheet.pdf)