# LM239QT

**STMicroelectronics** · Comparators · QFN-16-EP(3x3)

LM239QT from STMicroelectronics, in a QFN-16-EP(3x3). 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 | VCC+ | power_in | Positive supply; datasheet gives 2 to 32 V single supply (absolute maximum 36 V). |
| 2 | IN-1 | input | Inverting input of comparator 1; common-mode range 0 to VCC+ - 1.5 V. |
| 3 | NC | unconnected | No internal connection. |
| 4 | IN+1 | input | Non-inverting input of comparator 1; common-mode range 0 to VCC+ - 1.5 V. |
| 5 | IN-2 | input | Inverting input of comparator 2; common-mode range 0 to VCC+ - 1.5 V. |
| 6 | IN+2 | input | Non-inverting input of comparator 2; common-mode range 0 to VCC+ - 1.5 V. |
| 7 | IN-3 | input | Inverting input of comparator 3; common-mode range 0 to VCC+ - 1.5 V. |
| 8 | IN+3 | input | Non-inverting input of comparator 3; common-mode range 0 to VCC+ - 1.5 V. |
| 9 | IN-4 | input | Inverting input of comparator 4; common-mode range 0 to VCC+ - 1.5 V. |
| 10 | NC | unconnected | No internal connection. |
| 11 | IN+4 | input | Non-inverting input of comparator 4; common-mode range 0 to VCC+ - 1.5 V. |
| 12 | VCC- | power_in | Negative supply or ground for single-supply operation. |
| 13 | OUT4 | output | Open-collector output of comparator 4; max output current about 20 mA, 250 mV typ saturation at 4 mA sink. |
| 14 | OUT3 | output | Open-collector output of comparator 3; max output current about 20 mA, 250 mV typ saturation at 4 mA sink. |
| 15 | OUT2 | output | Open-collector output of comparator 2; max output current about 20 mA, 250 mV typ saturation at 4 mA sink. |
| 16 | OUT1 | output | Open-collector output of comparator 1; max output current about 20 mA, 250 mV typ saturation at 4 mA sink. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | QFN-16-EP(3x3) |
| Category | Amplifiers/Comparators |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `LM239QT`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: QFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm239qt-etched.step` / `lm239qt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm239qt.step` / `lm239qt.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/8588954737697415168) (19 pp, sha256 `5adc47258717f516`, retrieved 2026-10-06, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/lm239qt-datasheet.pdf)