# NCP1117ST50T3G

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

NCP1117ST50T3G from onsemi, 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 | Adjust/Ground | power_in | Adjust/ground pin, which on the fixed 5.0 V device is the ground return and carries a ground current that the datasheet gives as 3.0 mA to 5.0 mA depending on output voltage. |
| 2 | Output | power_out | Regulated 5.0 V output (4.90 V to 5.10 V at 0 to 800 mA for Vin of 6.5 V to 12 V) that can deliver more than 1.0 A, with a required output capacitor of at least 4.7 µF and ESR between 33 mΩ (typ) and 2.2 Ω; the heatsink tab is connected to this pin. |
| 3 | Input | power_in | Unregulated input supply that must not exceed 20 V (absolute maximum), with a maximum dropout of 1.2 V at 800 mA over temperature and an input bypass capacitor of about 10 µF recommended. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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, Fixed 5.0 V (Vin = 7.0 V, Iout = 10 mA, TA = 25°C) | Vout | 4.95 | 5 | 5.05 | V | Vin = 7.0 V, Iout = 10 mA, TA = 25°C | 4 |
| Output Voltage, Fixed 5.0 V (full range) | Vout | 4.9 |  | 5.1 | V | Vin = 6.5 V to 12 V, Iout = 0 mA to 800 mA (Note 4) | 4 |
| Dropout Voltage (Iout = 100 mA) | Vin−Vout |  | 0.95 | 1.1 | V | Measured at Vout − 100 mV, Iout = 100 mA | 4 |
| Dropout Voltage (Iout = 500 mA) | Vin−Vout |  | 1.01 | 1.15 | V | Measured at Vout − 100 mV, Iout = 500 mA | 4 |
| Dropout Voltage (Iout = 800 mA) | Vin−Vout |  | 1.07 | 1.2 | V | Measured at Vout − 100 mV, Iout = 800 mA | 4 |
| Line Regulation, 5.0 V | Regline |  | 0.9 | 6 | mV | Vin = 6.5 V to 15 V, Iout = 0 mA | 4 |
| Load Regulation, 5.0 V | Regline |  | 6.7 | 10 | mV | Iout = 0 mA to 800 mA, Vin = 6.5 V | 4 |
| Ripple Rejection, 5.0 V | RR | 60 | 64 |  | dB | Vin−Vout = 6.4 V, Iout = 500 mA, 10 Vpp 120 Hz Sinewave | 5 |
| Output Current Limit | Iout | 1000 | 1500 | 2200 | mA | Vin−Vout = 5.0 V, TA = 25°C, Note 6 | 4 |
| Quiescent Current, 5.0 V | IQ |  | 6 | 10 | mA | Vin = 15 V | 5 |
| Thermal Regulation |  |  | 0.01 | 0.1 | %/W | TA = 25°C, 30 ms Pulse | 5 |
| Input Voltage (absolute maximum) | Vin |  |  | 20 | V | Note 1 | 3 |
| Maximum Die Junction Temperature Range | TJ | -55 |  | 150 | °C |  | 3 |
| Storage Temperature Range | Tstg | -65 |  | 150 | °C |  | 3 |
| Operating Ambient Temperature Range (NCP1117) | TA | 0 |  | 125 | °C | NCP1117 (commercial) grade | 3 |
| Thermal Resistance, Junction-to-Ambient, SOT-223 Minimum Size Pad | RJA |  |  | 160 | °C/W | Case 318H (SOT-223), minimum size pad | 3 |
| Thermal Resistance, Junction-to-Case, SOT-223 | RJC |  |  | 15 | °C/W | Case 318H (SOT-223) | 3 |

## CAD (KiCad official)

- Symbol: `NCP1117ST50T3G`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `ncp1117st50t3g-etched.step` / `ncp1117st50t3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ncp1117st50t3g.step` / `ncp1117st50t3g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586173026711191552) (20 pp, sha256 `c962358436ca7db6`, 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/ncp1117st50t3g-datasheet.pdf)