# LM1117RS-1.2

**HTC Korea TAEJIN Tech** · Linear Voltage Regulators (LDO) · TO-252-2(DPAK)

LM1117RS-1.2 from HTC Korea TAEJIN Tech, in a TO-252-2(DPAK). 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 | ADJ/GND | power_in | On the fixed 1.2V version this pin is ground (the datasheet labels it ADJ/GND, with the adjust function applying only to ADJ versions). |
| 2 | VOUT | power_out | Regulated 1.2V output, which requires an output capacitor of 10uF or larger for stability. |
| 3 | VIN | power_in | Unregulated input supply with a maximum input voltage of 20V and an operating input voltage of 12V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HTC Korea TAEJIN Tech |
| Package | TO-252-2(DPAK) |
| Category | Power Management ICs |
| 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 |
|---|---|---|---|---|---|---|---|
| Input Supply Voltage | VIN |  |  | 20 | V |  | 1 |
| Lead Temperature | TSOL |  |  | 260 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -65 |  | 150 | ℃ |  | 1 |
| Operating Junction Temperature Range | TOPR | -40 |  | 125 | ℃ |  | 1 |
| Output Voltage | VO | 1.176 | 1.2 | 1.224 | V | VIN = 2.7V, IO = 10mA | 5 |
| Output Voltage | VO | 1.152 |  | 1.248 | V | VIN = 2.7V to 12V, IO = 0mA to 1A (TJ = 0 ~ 125℃) | 5 |
| Line Regulation | ΔVLINE |  | 0.1 | 0.2 | % | IO = 10mA, VIN = 2.7V to 12V | 5 |
| Load Regulation | ΔVLOAD |  | 0.2 | 0.4 | % | IO = 10mA to 1A, VIN = 3.2V | 5 |
| Operating Input Voltage | VIN |  |  | 12 | V |  | 5 |
| Quiescent Current | ID |  | 5 | 10 | ㎃ | VIN - VO = 5V | 5 |
| Supply Voltage Rejection | SVR | 60 | 75 |  | dB | IO = 1A, f = 120Hz, VIN - VO = 1.5V, VRIPPLE = 1VPP | 5 |
| Dropout Voltage | VD |  | 1 | 1.1 | V | IO = 100mA | 8 |
| Dropout Voltage | VD |  | 1.1 | 1.2 | V | IO = 500mA | 8 |
| Dropout Voltage | VD |  | 1.2 | 1.3 | V | IO = 1A | 8 |
| Thermal Resistance Junction-To-Ambient / TO-252 | θJA-TO-252 |  |  | 105 | °C/W | No heat sink / No air flow / No adjacent heat source / TA=25°C | 12 |
| Current Limit | IO |  | 1000 |  | ㎃ | VIN - VO = 5V | 5 |
| Output Noise (%VO) | EN |  | 0.003 |  | % | B = 10Hz to 10kHz, TJ = 25℃ | 5 |
| Temperature Stability |  |  | 0.5 |  | % |  | 8 |
| Long Term Stability |  |  | 0.3 |  | % | 1000 hrs, TJ = 125℃ | 8 |
| Thermal Regulation |  |  | 0.003 |  | %/W | TA = 25℃, 30ms Pulse | 8 |

## CAD (KiCad official)

- Symbol: `LM1117RS-1.2`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252-2(DPAK) (KiCad packages3D, STEP)
- 3D model files: `lm1117rs-1-2-etched.step` / `lm1117rs-1-2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm1117rs-1-2.step` / `lm1117rs-1-2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HTC Korea TAEJIN Tech datasheet](docs/lm1117rs-1-2-datasheet.pdf) (13 pp, sha256 `e809b301166d1a79`, 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/lm1117rs-1-2-datasheet.pdf)