# RS6331BXF

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

RS6331BXF 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 | +IN | input | Non-inverting analog input. Common-mode input voltage range extends from V- - 0.1V to V+ + 0.1V (rail-to-rail input) with Vs = 5.5V. Input bias current typ. 1pA. |
| 2 | V- | power_in | Negative supply / ground rail. Total supply range V+ to V- = 2.5V to 5.5V (7.0V absolute max). Tie to GND for single-supply operation. |
| 3 | -IN | input | Inverting analog input. Rail-to-rail input range; inputs are diode-clamped to the supply rails and must be current-limited to <=10mA if driven >0.5V beyond either rail. |
| 4 | OUT | output | Rail-to-rail amplifier output. Output swing to within 8mV of the rails with 10k load, 25mV with 2k load. Short-circuit output current typ. 55mA. Slew rate 0.5V/us. |
| 5 | V+ | power_in | Positive supply rail, +2.5V to +5.5V (7.0V absolute max V+ to V-). Quiescent current 58uA typ, 80uA max. Decouple locally with a 0.1uF ceramic capacitor to V-. |

## 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.

- `RS6331BXF`
- `RS6331XF`
- `RS6331XK`
- `RS6331XM`

## 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 | 2.5 |  | 5.5 | V | TJ=25°C | 3 |
| Quiescent Current/Amplifier | IQ |  | 58 | 80 | uA | TJ=25°C | 3 |
| Input Offset Voltage | Vos |  | 0.6 | 3 | mV | Vcm=Vs/2; TJ=25°C | 3 |
| Input Bias Current | IB |  | 1 | 10 | pA | TJ=25°C | 3 |
| Input Offset Current | Ios |  | 1 | 10 | pA | TJ=25°C | 3 |
| Common-Mode Voltage Range | Vcm | -0.1 |  | 5.6 | V | Vs=5.5V; TJ=25°C | 3 |
| Supply Current in Shutdown | IQ(OFF) |  |  | 1 | uA | TJ=25°C; printed as < 1 uA | 3 |
| Shut Down (logic low) threshold | VL |  |  | 0.8 | V | Referenced to V-; TJ=25°C | 3 |
| Amplifier Is Active (logic high) threshold | VH | 2 |  |  | V | Referenced to V-; TJ=25°C | 3 |
| Input Terminals Voltage |  | -0.5 |  |  | V | Referenced to supply rails; upper limit printed as (V+)+0.5V | 2 |
| Input Terminals Current |  | -10 |  | 10 | mA | Input terminals, see note 2 | 2 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 2 |
| Operating Temperature |  | -40 |  | 125 | °C |  | 2 |
| Junction Temperature |  |  |  | 150 | °C |  | 2 |
| Package Thermal Resistance (SOT23-5) |  |  | 200 |  | °C/W | TA=+25°C | 2 |

## CAD (KiCad official)

- Symbol: `RS6331BXF`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rs6331bxf-etched.step` / `rs6331bxf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs6331bxf.step` / `rs6331bxf.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`rs6331bxf.step`](rs6331bxf.step) | 85 KB | You want the bare part, or you mark your own boards. |
| [`rs6331bxf-etched.step`](rs6331bxf-etched.step) | 2.1 MB | You want the part with `RS6331BXF` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 498 faces against 102 in the bare model. It
survives export, section views, and rendering in any CAD tool, and it drops straight
into KiCad or Fusion with no extra setup.

## Provenance

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

- **Datasheet:** [Jiangsu RUNIC Tech datasheet](docs/rs6331bxf-datasheet.pdf) (18 pp, sha256 `b116c9f04b5bdc78`, 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/rs6331bxf-datasheet.pdf)