# REG101UA-A

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

REG101UA-A from Texas Instruments, in a SOIC-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 | VOUT | power_out | Regulated output; pin 1 and pin 2 must both be connected. Source of output current limited by foldback current limit (typ 170 mA). |
| 2 | VOUT | power_out | Regulated output; pin 1 and pin 2 must both be connected. |
| 3 | NR/Adjust | passive | For REG101-A, this is the voltage-setting resistor pin (reference 1.267 V typ, adjust pin current 0.2 µA typ, 1 µA max, absolute maximum voltage -0.3 V to 6.0 V). |
| 4 | GND | power_in | Ground pin for the regulator. |
| 5 | Enable | input | Enable input: output is enabled when VENABLE is at least 1.8 V and disabled when VENABLE is 0.5 V or less; absolute maximum is -0.3 V to VIN. |
| 6 | NC | unconnected | No internal connection. |
| 7 | VIN | power_in | Supply input; pin 7 and pin 8 must both be connected, with operating input range 1.8 V to 10 V and absolute maximum 12 V. |
| 8 | VIN | power_in | Supply input; pin 7 and pin 8 must both be connected, with operating input range 1.8 V to 10 V and absolute maximum 12 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `REG101UA-A`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `reg101ua-a-etched.step` / `reg101ua-a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `reg101ua-a.step` / `reg101ua-a.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/reg101) (25 pp, sha256 `4b1eaa2d39ccb308`, retrieved 2026-10-09, 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/reg101ua-a-datasheet.pdf)