# RS803-3.08YSF3

**Jiangsu RUNIC Tech** · Supervisor And Reset ICs · SOT23

RS803-3.08YSF3 from Jiangsu RUNIC Tech, in a SOT23. 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 | GND | power_in | Ground, the reference for all signals. |
| 2 | RESET | output | Active-low open-drain reset output that remains low while VCC is below the reset threshold and for at least 200ms after VCC rises above the reset threshold; it requires an external pull-up resistor that may connect to any supply from 0V to 6V. |
| 3 | VCC | power_in | Power supply voltage that is monitored; the device operating voltage range is 1.2V to 5.5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOT23 |
| 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 |
|---|---|---|---|---|---|---|---|
| Operating Voltage Range | VCC | 1.2 |  | 5.5 | V |  | 7 |
| Supply Current | ISUPPLY |  | 20 | 50 | µA |  | 7 |
| Reset Threshold | VRT | 2.94 | 3.08 | 3.21 | V | RS803-3.08 (VCC = 3.21V to 5.5V for this variant) | 7 |
| Reset Pulse Width | tRS | 100 | 200 | 460 | ms |  | 7 |
| RESET Output voltage Low |  |  |  | 0.4 | V | IOL = 1.2mA | 7 |
| RESET Open-Drain output Leakage Current | Ilkg(OD) |  |  | 1 | µA | VCC > VRT, RESET deasserted | 7 |
| VCC supply voltage range | VCC | -0.5 |  | 6 | V |  | 6 |
| Input voltage range | VI | -0.5 |  | 6 | V |  | 6 |
| Voltage range applied to any output in the high-impedance or power-off state | Vo | -0.5 |  | 6 | V |  | 6 |
| Voltage range applied to any output in the high or low state | Vo | -0.5 |  |  | V | Printed maximum is VCC+0.5 V (not a numeric value) | 6 |
| Input clamp current | IIK | -20 |  |  | mA | VI<0 | 6 |
| Output clamp current | IOK | -20 |  |  | mA | VO<0 | 6 |
| Continuous output current | IO | -20 |  | 20 | mA |  | 6 |
| Continuous current through VCC or GND |  | -20 |  | 20 | mA |  | 6 |
| Junction temperature | TJ | -65 |  | 150 | °C |  | 6 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 6 |
| Operating temperature | TA | -40 |  | 125 | °C |  | 6 |
| Reset Threshold Hysteresis |  |  | 15 |  | mV | RS803-3.08 | 7 |
| Reset Threshold Temperature Coefficient |  |  | 30 |  | ppm/°C |  | 7 |
| Package thermal impedance (SOT23) | θJA |  | 295 |  | °C/W | Calculated per JESD-51; packages soldered directly onto a PCB | 6 |

## CAD (KiCad official)

- Symbol: `RS803-3.08YSF3`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT23 (KiCad packages3D, STEP)
- 3D model files: `rs803-3-08ysf3-etched.step` / `rs803-3-08ysf3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs803-3-08ysf3.step` / `rs803-3-08ysf3.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/8602997162435629056) (13 pp, sha256 `5084382dfa1ca18f`, retrieved 2026-10-17, 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/rs803-3-08ysf3-datasheet.pdf)