# LM2903XK-Q1

**Jiangsu RUNIC Tech** · Comparators · SOIC-8

LM2903XK-Q1 from Jiangsu RUNIC Tech, in a SOIC-8. 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 | OUTA | output | Channel A open-drain output, which needs an external pull-up; the signal output pin is rated for ±55 mA and must not swing more than 0.3 V beyond the supply rails. |
| 2 | -INA | input | Channel A inverting input, which must stay between (V-) - 0.3 V and (V+) + 0.3 V, with input current limited to 10 mA if the signal swings beyond the rails. |
| 3 | +INA | input | Channel A noninverting input; the common-mode range is (V-) to (V+) - 1.5 V at 25°C and (V+) - 2.0 V over -40°C to +125°C, and the input must not go more than 0.3 V below (V-). |
| 4 | V- | power_in | Negative (lowest) power supply; the device runs from a single supply of 3.3 V to 32 V (VS = (V+) - (V-)) or a dual supply of ±1.65 V to ±16 V, with an absolute maximum of 36 V. |
| 5 | +INB | input | Channel B noninverting input; the common-mode range is (V-) to (V+) - 1.5 V at 25°C and (V+) - 2.0 V over -40°C to +125°C, and the input must not go more than 0.3 V below (V-). |
| 6 | -INB | input | Channel B inverting input, which must stay between (V-) - 0.3 V and (V+) + 0.3 V, with input current limited to 10 mA if the signal swings beyond the rails. |
| 7 | OUTB | output | Channel B open-drain output, which needs an external pull-up; the signal output pin is rated for ±55 mA and must not swing more than 0.3 V beyond the supply rails. |
| 8 | V+ | power_in | Positive (highest) power supply; the device runs from 3.3 V to 32 V single supply, with an absolute maximum supply of 36 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Jiangsu RUNIC Tech |
| Package | SOIC-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## 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=(V+)-(V-) | VS |  |  | 36 | V |  | 6 |
| Signal input pin (IN+, IN-) current |  | -10 |  | 10 | mA |  | 6 |
| Signal output pin current |  | -55 |  | 55 | mA |  | 6 |
| Operating range, free-air temperature | TA | -40 |  | 125 | °C |  | 6 |
| Junction temperature | TJ | -40 |  | 150 | °C |  | 6 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 6 |
| Supply voltage, single-supply | VS | 3.3 |  | 32 | V | Single-supply | 6 |
| Supply voltage, dual-supply (per-rail magnitude, printed ±1.65 / ±16) | VS | 1.65 |  | 16 | V | Dual-supply | 6 |
| VS Operating Voltage Range | VS | 3.3 |  | 32 | V |  | 7 |
| IQ Quiescent Current | IQ |  | 110 | 180 | uA | VS=5V, no load | 7 |
| IQ Quiescent Current | IQ |  |  | 250 | uA | VS=32V, no load, TA=-40C to +125C | 7 |
| Input offset voltage | VOS | -4.5 | 0.8 | 4.5 | mV | VS=5V to 32V | 7 |
| Input offset voltage | VOS | -5 |  | 5 | mV | VS=5V to 32V, TA=-40C to +125C | 7 |
| Input Bias Current | IB |  | 10 | 50 | pA | TA=25C | 7 |
| Input Bias Current | IB |  |  | 50 | nA | TA=-40C to +125C | 7 |
| Input Offset Current | IOS |  | 10 | 50 | pA | TA=25C | 7 |
| Input Offset Current | IOS |  |  | 50 | nA | TA=-40C to +125C | 7 |
| Large signal differential voltage amplification | AVD | 20 | 100 |  | V/mV | VS=15V, VO=1.4V to 11.4V, RL≥15k to (V+) | 7 |
| Low-Level output voltage | VOL |  | 200 | 350 | mV | Isink≤4mA, VID=-0.5V | 7 |
| Low-Level output voltage | VOL |  |  | 550 | mV | Isink≤4mA, VID=-0.5V, TA=-40C to +125C | 7 |
| Output Current (sinking) | IOL | 12 | 29 |  | mA | VO=2.5V; VID=-0.5V | 7 |
| High-Level Output Leakage Current | IOH-LKG |  | 15 | 80 | nA | (V+) =VO=5V; VID=0.5V | 7 |
| High-Level Output Leakage Current | IOH-LKG |  | 20 | 100 | nA | (V+) =VO=32V; VID=0.5V | 7 |
| Propagation Delay H To L | TPHL |  | 2.5 |  | us | VS=5V, RPU=5.1KΩ, Overdrive=10mV | 7 |
| Propagation Delay H To L | TPHL |  | 0.5 |  | us | VS=5V, RPU=5.1KΩ, Overdrive=100mV | 7 |
| Propagation Delay H To L | TPHL |  | 1.8 |  | us | VS=32V, RPU=5.1KΩ, Overdrive=10mV | 7 |
| Propagation Delay H To L | TPHL |  | 0.7 |  | us | VS=32V, RPU=5.1KΩ, Overdrive=100mV | 7 |
| Propagation Delay L To H | TPLH |  | 4.1 |  | us | VS=5V, RPU=5.1KΩ, Overdrive=10mV | 7 |
| Propagation Delay L To H | TPLH |  | 1.6 |  | us | VS=5V, RPU=5.1KΩ, Overdrive=100mV | 7 |
| Propagation Delay L To H | TPLH |  | 3.1 |  | us | VS=32V, RPU=5.1KΩ, Overdrive=10mV | 7 |
| Propagation Delay L To H | TPLH |  | 1.4 |  | us | VS=32V, RPU=5.1KΩ, Overdrive=100mV | 7 |
| Package thermal impedance, junction-to-ambient (SOIC-8(SOP8)) | θJA |  | 110.88 |  | °C/W | JESD-51, SOIC-8(SOP8) | 6 |

## CAD (KiCad official)

- Symbol: `LM2903XK-Q1`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOIC-8 (KiCad packages3D, STEP)
- 3D model files: `lm2903xk-q1-etched.step` / `lm2903xk-q1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2903xk-q1.step` / `lm2903xk-q1.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/8603086657763889152) (19 pp, sha256 `ed9ceabe901837aa`, retrieved 2026-10-19, 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/lm2903xk-q1-datasheet.pdf)