# EG1203

**EG Micro** · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · ESOP-8

EG1203 from EG Micro, in a ESOP-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 | VIN | power_in | Chip supply input; the absolute maximum rating for VIN is -0.3 V to 36 V. |
| 2 | VO1 | output | 3.3 V linear regulator output, rated for a maximum output current of 100 mA. |
| 3 | IO | output | Output port of the integrated overcurrent-protection transistor; absolute maximum rating is -0.3 V to VO1+0.3 V. |
| 4 | IS | input | Input port of the integrated overcurrent-protection transistor; absolute maximum rating is -0.3 V to 36 V. |
| 5 | Bin | input | Input port of the integrated power transistor, which can drive a buzzer or relay; absolute maximum rating is -0.3 V to 36 V. |
| 6 | GND | power_in | Chip ground. |
| 7 | CO | output | Collector output port of the integrated power transistor; absolute maximum rating is -0.3 V to 36 V. |
| 8 | VO2 | output | 12 V linear regulator output, rated for a maximum output current of 100 mA; absolute maximum rating is -0.3 V to 36 V. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | EG Micro |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Power input supply voltage (VIN) | VIN | -0.3 |  | 36 | V |  | 8 |
| 3.3V power output (VO1) | VO1 | -0.3 |  |  | V |  | 8 |
| Overcurrent-protection transistor output (IO) | IO | -0.3 |  |  | V |  | 8 |
| Overcurrent-protection transistor input (IS) | IS | -0.3 |  | 36 | V |  | 8 |
| Power transistor input (Bin) | Bin | -0.3 |  | 36 | V |  | 8 |
| Power transistor collector output (CO) | CO | -0.3 |  | 36 | V |  | 8 |
| 12V power output (VO2) | VO2 | -0.3 |  | 36 | V |  | 8 |
| Ambient temperature (TA) | TA | -45 |  | 125 | ℃ |  | 8 |
| Storage temperature (Tstr) | Tstr | -55 |  | 150 | ℃ |  | 8 |
| Soldering temperature (TL) | TL |  |  | 300 | ℃ | T=10S | 8 |
| ESD protection, human body model (HBM) | ESD（HBM） | 2 |  |  | KV |  | 8 |
| Quiescent current | Iq |  | 3.5 | 6 | mA | 8V≤Vi≤36V | 9 |
| 3.3V output voltage | VO2 | 3.2 | 3.3 | 3.3 | V | Io2=1mA | 9 |
| 3.3V load regulation | ΔVo2 |  | 12 | 60 | mV | Io2=1mA~80mA | 9 |
| 3.3V line regulation | ΔVo2 |  | 19 | 60 | mV | 8V≤Vi≤36V | 9 |
| 3.3V ripple rejection | RR | 41 | 50 |  | dB | 10V≤Vi≤20V, f=120Hz | 9 |
| 12V output voltage | VO2 | 11.7 | 12 | 12.3 | V | Io2=1mA | 9 |
| 12V load regulation | ΔVo2 |  | 20 | 60 | mV | Io2=1mA~80mA | 9 |
| 12V line regulation | ΔVo2 |  | 40 | 100 | mV | 14V≤Vi≤36V | 9 |
| 12V ripple rejection | RR | 41 | 50 |  | dB | 10V≤Vi≤20V, f=120Hz | 9 |
| Power transistor saturation voltage | VCE |  |  | 1.5 | V | Bin=3.3V，Ic=80mA | 9 |

## CAD (KiCad official)

- Symbol: `EG1203`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `eg1203-etched.step` / `eg1203-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `eg1203.step` / `eg1203.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [EG Micro datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589837128583843840) (10 pp, sha256 `ce4d9478c951b1d4`, retrieved 2026-10-18, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/eg1203-datasheet.pdf)