component

LM311DR

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by Ray

Texas Instruments Comparators, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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LM311DR

Texas Instruments · Comparators · SOIC-8

LM311DR from Texas Instruments, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 EMIT OUT output Output emitter of the comparator output transistor. Together with COL OUT forms an isolated output stage that can be referenced to either VCC+ or VCC-.
2 IN+ input Noninverting comparator input. Input voltage magnitude must not exceed
3 IN- input Inverting comparator input. Input voltage magnitude must not exceed
4 VCC- power_in Negative supply rail. Total supply (VCC+ - VCC-) range is 3.5 V to 30 V; absolute max VCC- is -18 V.
5 BALANCE input Offset balance (input offset trim) pin. Used with BAL/STRB for offset nulling via an external trim network.
6 BAL/STRB input Balance/Strobe pin. When pulled low the output is forced to the off state regardless of the differential input, providing an output-disable/strobe function; also used with BALANCE for offset nulling.
7 COL OUT output Output collector of the comparator output transistor (open collector). Can switch loads up to 50 V at 50 mA and be wire-OR connected; voltage from collector to VCC- rated to 40 V (LM311).
8 VCC+ power_in Positive supply rail. Total supply (VCC+ - VCC-) range is 3.5 V to 30 V; absolute max VCC+ is 18 V.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-8
Category Amplifiers/Comparators
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • LM311DRD
  • LM311DR
  • LM311DRP
  • LM311DRPW
  • LM311DRPS
  • LM311DRJG
  • LM311DRFK

CAD (KiCad official)

  • Symbol: LM311DR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Texas Instruments datasheet (42 pp, sha256 c4f907a0fa591db0, 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