# RS4G125XP

**Jiangsu RUNIC Tech** · Buffers, Drivers, Receivers, Transceivers · SOIC-14

RS4G125XP from Jiangsu RUNIC Tech, in a SOIC-14. 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 | 1OE | input | Active-low output enable for buffer 1; the output is disabled (high-impedance) when OE is high, and OE should be tied to VCC through a pullup resistor to hold the high-impedance state during power up or power down. |
| 2 | 1A | input | Data input of buffer 1, which accepts voltages up to 5.5V. |
| 3 | 1Y | output | 3-state output of buffer 1, rated for ±24mA output drive at VCC=3.0V and ±50mA continuous output current. |
| 4 | 2OE | input | Active-low output enable for buffer 2; the output is disabled (high-impedance) when OE is high, and OE should be tied to VCC through a pullup resistor to hold the high-impedance state during power up or power down. |
| 5 | 2A | input | Data input of buffer 2, which accepts voltages up to 5.5V. |
| 6 | 2Y | output | 3-state output of buffer 2, rated for ±24mA output drive at VCC=3.0V and ±50mA continuous output current. |
| 7 | GND | power_in | Ground reference for the device. |
| 8 | 3Y | output | 3-state output of buffer 3, rated for ±24mA output drive at VCC=3.0V and ±50mA continuous output current. |
| 9 | 3A | input | Data input of buffer 3, which accepts voltages up to 5.5V. |
| 10 | 3OE | input | Active-low output enable for buffer 3; the output is disabled (high-impedance) when OE is high, and OE should be tied to VCC through a pullup resistor to hold the high-impedance state during power up or power down. |
| 11 | 4Y | output | 3-state output of buffer 4, rated for ±24mA output drive at VCC=3.0V and ±50mA continuous output current. |
| 12 | 4A | input | Data input of buffer 4, which accepts voltages up to 5.5V. |
| 13 | 4OE | input | Active-low output enable for buffer 4; the output is disabled (high-impedance) when OE is high, and OE should be tied to VCC through a pullup resistor to hold the high-impedance state during power up or power down. |
| 14 | VCC | power_in | Power supply, operating range 1.65V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOIC-14 |
| Category | Logic |
| Pins | 14 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage, operating | VCC | 1.65 |  | 5.5 | V | Operating | 6 |
| Supply voltage, data retention only | VCC | 1.5 |  | 5.5 | V | Data retention only | 6 |
| High-level input voltage | VIH | 1.7 |  |  | V | VCC=2.3V to 2.7V | 6 |
| High-level input voltage | VIH | 2.2 |  |  | V | VCC=3V to 3.6V | 6 |
| Low-level input voltage | VIL |  |  | 0.3 | V | VCC=2.3V to 2.7V | 6 |
| Low-level input voltage | VIL |  |  | 0.4 | V | VCC=3V to 3.6V | 6 |
| Input voltage | VI | 0 |  | 5.5 | V |  | 6 |
| Output voltage | VO | 0 |  |  | V |  | 6 |
| Input transition rise or fall time | tr, tf |  |  | 20 | ns/V | VCC=1.8V±0.15V, 2.5V±0.2V | 6 |
| Input transition rise or fall time | tr, tf |  |  | 10 | ns/V | VCC=3.3V±0.3V | 6 |
| Input transition rise or fall time | tr, tf |  |  | 5 | ns/V | VCC=5V±0.5V | 6 |
| Operating temperature | TA | -40 |  | 125 | °C |  | 6 |
| High-level output voltage | VOH | 1.2 |  |  | V | IOH = -4mA, VCC=1.65V, Full temperature | 6 |
| High-level output voltage | VOH | 1.9 |  |  | V | IOH = -8mA, VCC=2.3V, Full temperature | 6 |
| High-level output voltage | VOH | 2.4 |  |  | V | IOH = -16mA, VCC=3V, Full temperature | 6 |
| High-level output voltage | VOH | 2.3 |  |  | V | IOH = -24mA, VCC=3V, Full temperature | 6 |
| High-level output voltage | VOH | 3.8 |  |  | V | IOH = -32mA, VCC=4.5V, Full temperature | 6 |
| Low-level output voltage | VOL |  |  | 0.1 | V | IOL = 100μA, VCC=1.65V to 5.5V, Full temperature | 6 |
| Low-level output voltage | VOL |  |  | 0.45 | V | IOL = 4mA, VCC=1.65V | 6 |
| Low-level output voltage | VOL |  |  | 0.3 | V | IOL = 8mA, VCC=2.3V | 6 |
| Low-level output voltage | VOL |  |  | 0.4 | V | IOL = 16mA, VCC=3V | 6 |
| Low-level output voltage | VOL |  |  | 0.55 | V | IOL = 24mA, VCC=3V | 6 |
| Input leakage current, A or OE inputs | II | -1 |  | 1 | µA | VI=5.5V or GND, VCC=0V to 5.5V, +25C | 6 |
| Input leakage current, A or OE inputs | II | -5 |  | 5 | µA | VI=5.5V or GND, VCC=0V to 5.5V, Full temperature | 6 |
| Power-off leakage current | Ioff | -1 |  | 1 | µA | VI or VO=5.5V, VCC=0V, +25C | 6 |
| Power-off leakage current | Ioff | -10 |  | 10 | µA | VI or VO=5.5V, VCC=0V, Full temperature | 6 |
| Off-state (high-impedance) output current | IOZ |  |  | 10 | µA | VO=0V to 5.5V, VCC=3.6V, Full temperature | 6 |
| Supply current | ICC |  | 0.1 | 1 | µA | VI=5.5V or GND, IO=0, VCC=1.65V to 5.5V, +25C | 6 |
| Supply current | ICC |  |  | 10 | µA | VI=5.5V or GND, IO=0, VCC=1.65V to 5.5V, Full temperature | 6 |
| Additional supply current per input | ΔICC |  |  | 500 | µA | One input at VCC-0.6V, other inputs at VCC or GND, VCC=3V to 5.5V, Full temperature | 6 |
| Supply voltage range | VCC | -0.5 |  | 6.5 | V |  | 4 |
| Input voltage range | VI | -0.5 |  | 6.5 | V |  | 4 |
| Voltage range applied to any output in the high-impedance or power-off state | Vo | -0.5 |  | 6.5 | V |  | 4 |
| Input clamp current | IIK | -50 |  |  | mA | VI<0 | 4 |
| Output clamp current | IOK | -50 |  |  | mA | VO<0 | 4 |
| Continuous output current | IO | -50 |  | 50 | mA |  | 4 |
| Continuous current through VCC or GND |  | -100 |  | 100 | mA |  | 4 |
| Junction temperature | TJ | -65 |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Electrostatic discharge, human-body model | V(ESD) | -8000 |  | 8000 | V | Human-body model (HBM) | 4 |
| Electrostatic discharge, machine model | V(ESD) | -500 |  | 500 | V | Machine model (MM) | 4 |
| Junction-to-ambient thermal resistance | RϴJA |  | 122.2 |  | °C/W | SOIC-14(SOP14) package | 4 |
| Junction-to-case (top) thermal resistance | RϴJC(top) |  | 80.9 |  | °C/W | SOIC-14(SOP14) package | 4 |
| Junction-to-board thermal resistance | RϴJB |  | 80.6 |  | °C/W | SOIC-14(SOP14) package | 4 |
| Junction-to-top characterization parameter | ѰJT |  | 40.4 |  | °C/W | SOIC-14(SOP14) package | 4 |
| Junction-to-board characterization parameter | ѰJB |  | 80.3 |  | °C/W | SOIC-14(SOP14) package | 4 |

## CAD (KiCad official)

- Symbol: `RS4G125XP`
- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`
- 3D model: SOIC-14 (KiCad packages3D, STEP)
- 3D model files: `rs4g125xp-etched.step` / `rs4g125xp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs4g125xp.step` / `rs4g125xp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603079289600692224) (11 pp, sha256 `5e8a48a04dd1d90a`, retrieved 2026-10-20, 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/rs4g125xp-datasheet.pdf)