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LM393

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TI dual differential comparator, SOIC-8. Open-collector, single 2-36 V, input range includes ground. Datasheet-verified.

componentcomparatordualopen-collectorsoic-8texas-instruments
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Made with kicad-footprint-generator 10.0 · KiCad file format 20260206
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LM393

Texas Instruments · Dual differential comparator · SOIC-8

Dual differential comparator with open-collector outputs in a SOIC-8 package. Two independent comparators run from a single 2-36 V supply (or split ±1 to ±18 V), with a common-mode input range that includes ground. The open-collector outputs need a pull-up resistor and can wire-OR or level-shift. The default choice for threshold detection, zero-cross sensing, and simple hysteresis (Schmitt) triggers.

Pinout

Pin Name Type Function
1 1OUT output Comparator 1 open-collector output. Requires an external pull-up resistor to VCC (typical 1 kΩ to 100 kΩ). Sinks up to 16 mA typical.
2 1IN- input Comparator 1 inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
3 1IN+ input Comparator 1 non-inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
4 GND power_in Ground / negative supply reference (V-). Tie to 0 V for single-supply operation, or to the negative rail for split-supply operation.
5 2IN+ input Comparator 2 non-inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
6 2IN- input Comparator 2 inverting analog input. Input common-mode range includes ground; V(IN) from 0 V to VCC−1.5 V.
7 2OUT output Comparator 2 open-collector output. Requires an external pull-up resistor to VCC (typical 1 kΩ to 100 kΩ). Sinks up to 16 mA typical.
8 VCC power_in Positive supply (V+). Single-supply: 2 V to 36 V. Split-supply: ±1 V to ±18 V. Bypass with a 0.1 µF ceramic capacitor to GND close to the pin.

Key specifications

Parameter Value
Type Dual differential comparator
Output Open-collector (needs pull-up)
Supply voltage 2-36 V single (±1 to ±18 V split)
Common-mode input range Includes ground (V-)
Response time ~1.3 µs typ
Channels 2 independent
Package SOIC-8
Body (L×W×H) 4.9 × 3.9 × 1.75 mm

Ordering variants

Same part, different packaging or reel option.

  • LM393D (SOIC-8, tube)
  • LM393DR (SOIC-8, tape & reel)

CAD (KiCad official)

  • Symbol: Comparator:LM393
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D)
  • 3D model files: lm393-etched.step / lm393-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm393.step / lm393.glb are the bare package body.

Provenance

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

  • Datasheet: Texas Instruments datasheet (56 pp, sha256 24c6b3c03dd65dfd, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF