LM339
Public Made by Adomby adom
TI quad differential comparator, SOIC-14. Open-collector outputs, single or split 2-36 V supply. Datasheet-verified.
3D Model
Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗PCB Footprint
Open full view ↗Datasheet
Open in new tab ↗README
markdownLM339
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
Same part, different packaging or reel option.
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)
- 3D model files:
lm339-etched.step/lm339-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm339.step/lm339.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (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).