# RS621PXF

**Jiangsu RUNIC Tech** · Operational Amplifier · SOT-23-5

RS621PXF from Jiangsu RUNIC Tech, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | OUT | output | Amplifier output. Rail-to-rail output swing (within ~40 mV of rails with RL=2 kΩ, ~7 mV with RL=10 kΩ). Short-circuit current typically 50 mA. |
| 2 | V- | power_in | Negative supply rail. Tie to GND for single-supply operation or to the negative rail for dual-supply operation. Total supply (V+ to V-) must be 2.5 V to 5.5 V (7.0 V absolute max). |
| 3 | +IN | input | Non-inverting input. Rail-to-rail common-mode range from -0.1 V to +5.6 V with Vs=5.5 V. Input bias current typically 1 pA (10 pA max at 25°C). |
| 4 | -IN | input | Inverting input. Rail-to-rail common-mode range from -0.1 V to +5.6 V with Vs=5.5 V. Input bias current typically 1 pA (10 pA max at 25°C). Input terminals are diode-clamped to the supplies; limit fault current to ≤10 mA. |
| 5 | V+ | power_in | Positive supply rail. Operating range 2.5 V to 5.5 V referenced to V- (7.0 V absolute max). Decouple with a 0.1 uF capacitor placed close to the pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOT-23-5 |
| Category | Op-amp/Cmp |
| Pins | 5 |

## Ordering variants

Same part, different packaging or reel option.

- `RS621PXF`
- `RS621BPXF`
- `RS621PXK`
- `RS621PXM`
- `RS622PXK`
- `RS622PXM`
- `RS622PXT`
- `RS622PXQ`
- `RS624PXP`
- `RS624PXQ`

## 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 (Vs) | Vs | 2.5 |  | 5.5 | V | 25°C | 3 |
| Quiescent Current per Amplifier | IQ |  | 600 | 800 | uA | 25°C | 3 |
| Input Offset Voltage | Vos | -0.5 | 0.1 | 0.5 | mV | Vcm=Vs/2, 25°C | 3 |
| Input Offset Voltage Drift | Vos TC |  |  | 2 | uV/°C | -40°C to 125°C | 3 |
| Input Bias Current | IB |  | 1 | 10 | pA | 25°C | 3 |
| Input Offset Current | Ios |  | 1 | 10 | pA | 25°C | 3 |
| Common-Mode Voltage Range | Vcm | -0.1 |  | 5.6 | V | Vs=5.5V, 25°C | 3 |
| Supply Voltage, V+ to V- |  |  |  | 7 | V |  | 2 |
| Input Terminals Voltage |  | -0.5 |  |  | V | Referenced to (V+)+0.5V upper limit, footnote (2) | 2 |
| Input Terminals Current |  | -10 |  | 10 | mA |  | 2 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 2 |
| Operating Temperature |  | -40 |  | 125 | °C |  | 2 |
| Junction Temperature |  |  |  | 150 | °C |  | 2 |
| Output Short-Circuit Current | Iout |  | 50 |  | mA | 25°C | 3 |
| Slew Rate | SR |  | 3.7 |  | V/us | 25°C | 3 |
| Gain-Bandwidth Product | GBP |  | 7 |  | MHz | 25°C | 3 |
| Phase Margin | Φm |  | 64 |  | ° | 25°C | 3 |
| Settling Time | ts |  | 0.5 |  | us | 0.1% | 3 |
| Overload Recovery Time |  |  | 0.5 |  | us | VIN • Gain ≥ Vs | 3 |
| Input-Referred Voltage Noise at 1 kHz | en |  | 11 |  | nV/√Hz | f = 1 kHz, 25°C | 3 |
| Input-Referred Voltage Noise at 10 kHz | en |  | 7.5 |  | nV/√Hz | f = 10 kHz, 25°C | 3 |
| Package Thermal Resistance SOT23-5 |  |  | 200 |  | °C/W | @ TA = +25°C | 2 |

## CAD (KiCad official)

- Symbol: `RS621PXF`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rs621pxf-etched.step` / `rs621pxf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs621pxf.step` / `rs621pxf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs621pxf-datasheet.pdf) (14 pp, sha256 `cad15b6d4c5f5e33`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/rs621pxf-datasheet.pdf)