# LR1117CS12X

**LRC** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · SOT-223

LR1117CS12X from LRC, in a SOT-223. 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 | Vss/ADJ | power_in | Ground pin of the LR1117C fixed 1.2V version, which serves as the ADJ pin on the adjustable version where two external resistors set the output from 1.25V to 12V. |
| 2 | Vout | power_out | Regulated output with a maximum output current of 1A and output voltage accuracy within ±2%. |
| 3 | Vin | power_in | Input pin with an input voltage range of maximum 15V and a dropout of 1.3V at 1A load current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LRC |
| Package | SOT-223 |
| Category | Power Management (PMIC) |
| Pins | 3 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Output Voltage (LR1117C-1.2V) | Vout | 1.176 | 1.2 | 1.224 | V | 0≤Iout≤1A, Vin=3.2V | 3 |
| Line Regulation (LR1117C-1.2V) | ΔVout |  | 0.1 | 0.2 | %/V | Iout=10mA, 2.7V≤Vin≤10V | 3 |
| Load Regulation (LR1117C-1.2V) | ΔVout |  | 10 | 30 | mV | Vin =2.7V, 10mA≤Iout≤1A | 3 |
| Dropout Voltage | Vdrop |  | 1.23 | 1.3 | V | Iout=100mA | 4 |
| Dropout Voltage | Vdrop |  | 1.3 | 1.5 | V | Iout=1A | 4 |
| Quiescent Current (LR1117C-1.2V) | Iq |  | 2 | 5 | mA | Vin =10V | 4 |
| Temperature Coefficient | ΔV/ΔT | -100 |  | 100 | ppm |  | 4 |
| Max Input Voltage |  |  |  | 18 | V |  | 2 |
| Max Operating Junction Temperature (Tj) |  |  |  | 150 | °C |  | 2 |
| Ambient Operating Temperature (Ta) |  | -40 |  | 85 | °C |  | 2 |
| Storage Temperature (Ts) |  | -40 |  | 150 | °C |  | 2 |
| Lead Temperature & Time |  |  |  | 260 | °C | 10S | 2 |
| Input Voltage Range |  |  |  | 15 | V |  | 2 |
| Operating Junction Temperature (Tj) |  | -40 |  | 125 | °C |  | 2 |
| Current Limit | Ilimit |  | 1 |  | A | Vin-Vout=2V, Tj=25°C | 4 |
| Supply Voltage Rejection | SVR |  | 60 |  | dB | f = 120Hz, VIN − VOUT = 3V + 1VPP Ripple | 4 |
| Thermal Resistance Junction to Ambient (SOT-223, no air flow) | Rθja |  | 105 |  | °C/W | Mounted on 42.25mm2 (Pin2) FR-4 board with 2oz copper | 2 |
| Thermal Resistance Junction to Case (SOT-223) |  |  | 25 |  | °C/W |  | 2 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | Copper |  | Note: 1.Rθja Test conditions:The device mounted on 42.25mm2(Pin2) FR-4 board with 2oz. Copper | 2 |

## CAD (KiCad official)

- Symbol: `LR1117CS12X`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `lr1117cs12x-etched.step` / `lr1117cs12x-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lr1117cs12x.step` / `lr1117cs12x.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LRC datasheet](docs/lr1117cs12x-datasheet.pdf) (13 pp, sha256 `56e4ce95ef3d2532`, retrieved 2026-11-05, 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/lr1117cs12x-datasheet.pdf)