# LM2903BYDT

**STMicroelectronics** · Comparators · SO-8

LM2903BYDT from STMicroelectronics, in a SO-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 | OUT1 | output | Output of comparator 1, which saturates low at 250 mV typ. (Iout = 4 mA) and is compatible with TTL, DTL, ECL, MOS and CMOS logic; the output short-circuit current is approximately 30 mA with infinite short-circuit duration. |
| 2 | IN1- | input | Inverting input of comparator 1; the input common-mode range includes the negative rail (Vcc- to Vcc+ - 1.5 V at 25 °C) and the low input voltage must not be less than -0.3 V. |
| 3 | IN1+ | input | Non-inverting input of comparator 1; the input voltage is limited to -0.3 V to 40 V (absolute maximum) and the input current to 10 mA. |
| 4 | VCC- | power_in | Negative supply rail, 0 V in the specified test conditions and the ground reference for single-supply operation; dual supplies of ±1 V to ±18 V are also possible. |
| 5 | IN2+ | input | Non-inverting input of comparator 2; the input voltage is limited to -0.3 V to 40 V (absolute maximum) and the input current to 10 mA. |
| 6 | IN2- | input | Inverting input of comparator 2; the input common-mode range includes the negative rail (Vcc- to Vcc+ - 1.5 V at 25 °C) and the low input voltage must not be less than -0.3 V. |
| 7 | OUT2 | output | Output of comparator 2, which saturates low at 250 mV typ. (Iout = 4 mA) and is compatible with TTL, DTL, ECL, MOS and CMOS logic; the output short-circuit current is approximately 30 mA with infinite short-circuit duration. |
| 8 | VCC+ | power_in | Positive supply rail, operating range 2 V to 36 V (absolute maximum 40 V for the B-grade device). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | SO-8 |
| Category | Amplifiers/Comparators |
| Pins | 8 |

## CAD (KiCad official)

- Symbol: `LM2903BYDT`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SO-8 (KiCad packages3D, STEP)
- 3D model files: `lm2903bydt-etched.step` / `lm2903bydt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm2903bydt.step` / `lm2903bydt.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603136456202199040) (20 pp, sha256 `bfa6780025a30e66`, retrieved 2026-10-08, 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/lm2903bydt-datasheet.pdf)