# RS621BXF

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

RS621BXF from Jiangsu RUNIC Tech, in a SOT-23-5. 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 | +IN | input | Positive (noninverting) input; common-mode voltage range is -0.1V to 5.6V with Vs = 5.5V. |
| 2 | V- | power_in | Negative (lowest) power supply; operates from 2.5V to 5.5V single-supply (or ±1.25V to ±2.75V dual-supply). |
| 3 | -IN | input | Negative (inverting) input; common-mode voltage range is -0.1V to 5.6V with Vs = 5.5V. |
| 4 | OUT | output | Output; rail-to-rail output swing with 50 mA typical short-circuit current at 25°C. |
| 5 | V+ | power_in | Positive (highest) power supply; operates from 2.5V to 5.5V single-supply, with absolute maximum supply voltage of 7V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOT-23-5 |
| Category | Operational Amplifier/Comparator |
| Pins | 5 |

## 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 | Vs |  |  | 7 | V | Supply, Vs=(V+)-(V-) | 6 |
| Operating range, TA | TA | -40 |  | 125 | °C | Operating free-air temperature | 6 |
| Junction temperature | TJ |  |  | 150 | °C | Junction | 6 |
| Storage temperature | Tstg | -65 |  | 150 | °C | Storage | 6 |
| Signal input pin current |  | -10 |  | 10 | mA | Signal input pin | 6 |
| Signal output pin current |  | -70 |  | 70 | mA | Signal output pin | 6 |
| ESD Human-body model | V(ESD) | -5000 |  | 5000 | V | Human-body model (HBM) | 6 |
| ESD Machine model | V(ESD) | -400 |  | 400 | V | Machine Model (MM) | 6 |
| Supply voltage single-supply | Vs | 2.5 |  | 5.5 | V | Single-supply | 6 |
| Supply voltage dual-supply | Vs | 1.25 |  | 2.75 | V | Dual-supply, ±1.25 V to ±2.75 V as printed | 6 |
| Operating voltage range | Vs | 2.5 |  | 5.5 | V | 25C | 9 |
| Quiescent current per amplifier | IQ |  | 600 | 800 | uA | 25C | 9 |
| Power-supply rejection ratio | PSRR | 78 | 93 |  | dB | Vs=2.5V to 5.5V, Vcm=(V-)+0.5V, 25C | 9 |
| Power-supply rejection ratio | PSRR | 72 |  |  | dB | Vs=2.5V to 5.5V, Vcm=(V-)+0.5V, -40C to 125C | 9 |
| Input offset voltage | Vos | -3 | 0.7 | 3 | mV | 25C | 9 |
| Input offset voltage average drift | Vos TC |  | 2 |  | uV/C | -40C to 125C | 9 |
| Input bias current | IB | -10 | 1 | 10 | pA | 25C | 9 |
| Input offset current | Ios | -10 | 1 | 10 | pA | 25C | 9 |
| Common-mode voltage range | Vcm | -0.1 |  | 5.6 | V | Vs= 5.5V, 25C | 9 |
| Common-mode rejection ratio | CMRR | 74 | 92 |  | dB | Vs= 5.5V, Vcm=-0.1V to 4V, 25C | 9 |
| Common-mode rejection ratio | CMRR | 68 |  |  | dB | Vs= 5.5V, Vcm=-0.1V to 4V, -40C to 125C | 9 |
| Common-mode rejection ratio | CMRR | 62 | 83 |  | dB | Vs= 5.5V, Vcm=-0.1V to 5.6V, 25C | 9 |
| Common-mode rejection ratio | CMRR | 60 |  |  | dB | Vs= 5.5V, Vcm=-0.1V to 5.6V, -40C to 125C | 9 |
| Open-loop voltage gain | AOL | 96 | 102 |  | dB | RL=2KΩ, Vo=0.15V to 4.85V, 25C | 9 |
| Open-loop voltage gain | AOL | 83 |  |  | dB | RL=2KΩ, Vo=0.15V to 4.85V, -40C to 125C | 9 |
| Open-loop voltage gain | AOL | 98 | 106 |  | dB | RL=10KΩ, Vo=0.05V to 4.95V, 25C | 9 |
| Open-loop voltage gain | AOL | 85 |  |  | dB | RL=10KΩ, Vo=0.05V to 4.95V, -40C to 125C | 9 |
| Output swing from rail |  |  |  | 40 | mV | RL=2KΩ, 25C | 9 |
| Output swing from rail |  |  | 7 |  | mV | RL=10KΩ, 25C | 9 |
| Output short-circuit current | Iout |  | 50 |  | mA | 25C | 9 |
| Slew rate | SR |  | 3.7 |  | V/us | 25C | 9 |
| Gain-bandwidth product | GBP |  | 7 |  | MHz | 25C | 9 |
| Phase margin | PM |  | 64 |  | ° | 25C | 9 |
| Setting time | ts |  | 0.5 |  | us | 0.1% | 9 |
| Overload recovery time |  |  | 0.5 |  | us | VIN·Gain≥VS | 9 |
| Input voltage noise density | en |  | 11 |  | nV/√Hz | f = 1KHz, 25C | 9 |
| Input voltage noise density | en |  | 7.5 |  | nV/√Hz | f = 10KHz, 25C | 9 |
| Supply current in shutdown | IQ(OFF) |  |  | 1 | uA | 25C, printed <1 uA | 9 |
| Turn-off time | tOFF |  | 3 |  | us | 25C | 9 |
| Turn-on time | tON |  | 20 |  | us | 25C | 9 |
| Junction-to-ambient thermal resistance | RθJA |  | 273.8 |  | °C/W | SOT23-5 column, RS621 table | 6 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 126.8 |  | °C/W | SOT23-5 column, RS621 table | 6 |
| Junction-to-board thermal resistance | RθJB |  | 85.9 |  | °C/W | SOT23-5 column, RS621 table | 6 |
| Junction-to-top characterization parameter | ΨJT |  | 10.9 |  | °C/W | SOT23-5 column, RS621 table | 6 |
| Junction-to-board characterization parameter | ΨJB |  | 84.9 |  | °C/W | SOT23-5 column, RS621 table | 6 |

## CAD (KiCad official)

- Symbol: `RS621BXF`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rs621bxf-etched.step` / `rs621bxf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs621bxf.step` / `rs621bxf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs621bxf-datasheet.pdf) (27 pp, sha256 `629551fe8d903c10`, retrieved 2026-10-28, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `off` (skipped (clean text read)), 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/rs621bxf-datasheet.pdf)