LM339

@@ -0,0 +1,58 @@+# LM339++**Texas Instruments** · Quad differential comparator · SOIC-14++Four independent voltage comparators in one SOIC-14, the quad sibling of the dual LM393. Each compares its two inputs and drives an open-collector output low when the minus input is above the plus input, so outputs wire-OR together and level-shift with a single pull-up resistor. The inputs work down to the negative rail, and it runs from a single 2 to 36 V supply or a split supply, which makes it easy to build level detectors, zero-crossing detectors, oscillators, and simple ADCs. Outputs need an external pull-up to the logic rail.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | 1OUT | output | Open-collector output of comparator 1. Requires an external pull-up resistor to VCC. Sink current up to 20 mA. |+| 2 | 2OUT | output | Open-collector output of comparator 2. Requires external pull-up to VCC. |+| 3 | VCC | power_in | Positive supply. 2 V to 36 V (LM339) or up to 38 V (LM339B). Single-supply operation supported. |+| 4 | 2IN- | input | Inverting (negative) input of comparator 2. Common-mode range includes ground. |+| 5 | 2IN+ | input | Non-inverting (positive) input of comparator 2. Common-mode range includes ground. |+| 6 | 1IN- | input | Inverting (negative) input of comparator 1. Common-mode range includes ground. |+| 7 | 1IN+ | input | Non-inverting (positive) input of comparator 1. Common-mode range includes ground. |+| 8 | 3IN- | input | Inverting (negative) input of comparator 3. Common-mode range includes ground. |+| 9 | 3IN+ | input | Non-inverting (positive) input of comparator 3. Common-mode range includes ground. |+| 10 | 4IN- | input | Inverting (negative) input of comparator 4. Common-mode range includes ground. |+| 11 | 4IN+ | input | Non-inverting (positive) input of comparator 4. Common-mode range includes ground. |+| 12 | GND | power_in | Negative supply / ground reference. Tied to system ground in single-supply operation. |+| 13 | 4OUT | output | Open-collector output of comparator 4. Requires external pull-up to VCC. |+| 14 | 3OUT | output | Open-collector output of comparator 3. Requires external pull-up to VCC. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Quad differential comparator |+| Comparators | 4 independent |+| Output | open-collector (needs pull-up) |+| Input range | down to negative rail |+| Supply | 2-36 V single or ±1-18 V split |+| Response time | ~1.3 µs |+| Offset voltage | ±2 mV typ |+| Package | SOIC-14 |++## Ordering variants++- `LM339D (SOIC-14, tube)`+- `LM339DR (SOIC-14, tape & reel)`++## CAD (KiCad official)++- Symbol: `Comparator:LM339`+- Footprint: `Package_SO:SOIC-14_3.9x8.7mm_P1.27mm`+- 3D model: SOIC-14 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/lm339.pdf) (54 pp, sha256 `2a488cbc06c3e6c4`, retrieved 2026-08-17, tier: manufacturer)+- **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/lm339-datasheet.pdf)

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