# RS8901XF

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

RS8901XF 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 | Comparator push-pull output. Drives high to V+ or low to V- depending on the sign of (IN+ - IN-). Short-circuit sink ~42mA, source ~38mA at Vs=5V. |
| 2 | V- | power_in | Negative supply / ground reference. Typically connected to GND in single-supply operation. Supply span V+ to V- must be 1.4V to 5.5V. |
| 3 | +IN | input | Non-inverting comparator input. Rail-to-rail common-mode range from (V-)-0.1V to (V+)+0.1V. Input bias current ~1pA typ; diode-clamped to supplies (limit external current to <=10mA). |
| 4 | -IN | input | Inverting comparator input. Rail-to-rail common-mode range from (V-)-0.1V to (V+)+0.1V. Input bias current ~1pA typ; diode-clamped to supplies (limit external current to <=10mA). |
| 5 | V+ | power_in | Positive supply. Operating range 1.4V to 5.5V; absolute maximum V+ to V- is 7.0V. Recommended local bypass 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.

- `RS8901XF`
- `RS8901XC5`

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Vs Operating Voltage Range | Vs | 1.4 |  | 5.5 | V |  | 3 |
| Input Offset Voltage | Vos | -3 | 1 | 3 | mV | VCM =Vs/2 | 3 |
| Input Bias Current | IB |  | 1 | 10 | pA |  | 3 |
| Common-Mode Voltage Range | VCM | -0.1 |  | 0.1 | V | TA = –40°C to 125°C; printed as (V-)-0.1 min and (V+)+0.1 max (rail-referenced) | 3 |
| Output Swing From Upper Rail | VOH |  | 70 | 75 | mV | Vs=1.4V,Io=0.1mA | 3 |
| Output Swing From Upper Rail | VOH |  | 140 | 170 | mV | Vs=5.0V,Io=2.5mA | 3 |
| Output Swing From Lower Rail | VOL |  | 35 | 40 | mV | Vs=1.4V,Io=-0.1mA | 3 |
| Output Swing From Lower Rail | VOL |  | 85 | 115 | mV | Vs=5.0V,Io=-2.5mA | 3 |
| Quiescent Current | IQ |  | 400 | 1500 | nA |  | 3 |
| Input Terminals Voltage |  | -0.5 |  | 0.5 | V | Printed as –0.5 to (V+) + 0.5V (rail-referenced) | 2 |
| Input Terminals Current |  | -10 |  | 10 | mA | ±10mA | 2 |
| Storage Temperature |  | -65 |  | 150 | °C |  | 2 |
| Operating Temperature |  | -40 |  | 125 | °C |  | 2 |
| Junction Temperature |  |  |  | 150 | °C |  | 2 |
| Lead Temperature (Soldering) |  |  |  | 260 | °C | 10s | 2 |
| ESD Susceptibility MM |  |  |  | 400 | V | MM | 2 |
| Power-Supply Rejection Ratio | PSRR |  | 70 |  | dB | Vs=1.4V to 5.5V, VCM=(V)+0.5V | 3 |
| Input Offset Voltage Drift | ΔVos/ΔT |  | 2 |  | µV/°C | VCM =Vs/2, -40°C ≤ TA ≤125°C | 3 |
| Common-Mode Rejection Ratio | CMRR |  | 70 |  | dB | Vs=5.5V, VCM =-0.1 to 5.6V | 3 |
| Short Circuit Sink Current | ISC |  | 42 |  | mA | Vs=5.0V | 3 |
| Short Circuit Source Current | ISC |  | 38 |  | mA | Vs=5.0V | 3 |
| Propagation Delay High to Low | TPHL |  | 13 |  | µs | Vs = 5.0 V, Overdrive = 10 mV | 3 |
| Propagation Delay High to Low | TPHL |  | 9 |  | µs | Vs = 5.0 V, Overdrive = 100 mV | 3 |
| Propagation Delay High to Low | TPHL |  | 12 |  | µs | Vs = 2.5 V, Overdrive = 10 mV | 3 |
| Propagation Delay High to Low | TPHL |  | 8 |  | µs | Vs = 2.5 V, Overdrive = 100 mV | 3 |
| Propagation Delay Low to High | TPLH |  | 30 |  | µs | Vs = 5.0 V, Overdrive = 10 mV | 3 |
| Propagation Delay Low to High | TPLH |  | 40 |  | µs | Vs = 5.0 V, Overdrive = 100 mV | 3 |
| Propagation Delay Low to High | TPLH |  | 22 |  | µs | Vs = 2.5 V, Overdrive = 10 mV | 3 |
| Propagation Delay Low to High | TPLH |  | 35 |  | µs | Vs = 2.5 V, Overdrive = 100 mV | 3 |
| Rise Time | TR |  | 240 |  | ns | Overdrive = 100 mV | 3 |
| Fall Time | TF |  | 260 |  | ns | Overdrive = 100 mV | 3 |

## CAD (KiCad official)

- Symbol: `RS8901XF`
- Footprint: `Package_TO_SOT_SMD:SOT-23-5`
- 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files: `rs8901xf-etched.step` / `rs8901xf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rs8901xf.step` / `rs8901xf.glb` are the bare package body.

## 3D model downloads

Two STEP files. Same geometry, different body top:

| File | Size | Use it when |
|---|---|---|
| [`rs8901xf.step`](rs8901xf.step) | 85 KB | You want the bare part, or you mark your own boards. |
| [`rs8901xf-etched.step`](rs8901xf-etched.step) | 1.9 MB | You want the part with `RS8901XF` already on it. |

The marking in the etched file is real recessed geometry cut into the solid, not a
texture or a decal: 449 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/rs8901xf-datasheet.pdf) (6 pp, sha256 `26736b2bd3c6beef`, 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/rs8901xf-datasheet.pdf)