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LM2903 Dual Comparator

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by adom

Dual differential comparator with open-collector outputs, single or split supply.

comparatordualopen-collectorsingle-supplytisoic-8
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LM2903

Texas Instruments · Comparator · SOIC-8

The LM2903 is a dual differential comparator with open-collector outputs, able to run from a single 2 V to 36 V supply or a split supply. The open-collector outputs wire-OR and interface to different logic rails through a pull-up. It is the wider-temperature-range sibling of the LM393, common in threshold detection and level sensing.

Pinout

Pin Name Type Function
1 1OUT output Output pin of comparator 1. Open-collector output; requires an external pull-up resistor to VCC. Compatible with TTL, MOS, and CMOS logic. Low-level output voltage typically 110 mV (400 mV max) at ISINK ≤ 4 mA.
2 1IN- input Inverting (negative) input of comparator 1. Common-mode input range extends from V- (ground) up to (V+) - 2.0V. Input bias current typically -3.5 nA (-25 nA max).
3 1IN+ input Non-inverting (positive) input of comparator 1. Common-mode input range extends from V- (ground) up to (V+) - 2.0V. Input bias current typically -3.5 nA (-25 nA max).
4 GND power_in Ground (V-). Negative supply / reference for both comparators. Connect to system ground for single-supply operation.
5 2IN+ input Non-inverting (positive) input of comparator 2. Common-mode input range extends from V- (ground) up to (V+) - 2.0V. Input bias current typically -3.5 nA (-25 nA max).
6 2IN- input Inverting (negative) input of comparator 2. Common-mode input range extends from V- (ground) up to (V+) - 2.0V. Input bias current typically -3.5 nA (-25 nA max).
7 2OUT output Output pin of comparator 2. Open-collector output; requires an external pull-up resistor to VCC. Compatible with TTL, MOS, and CMOS logic. Low-level output voltage typically 110 mV (400 mV max) at ISINK ≤ 4 mA.
8 VCC power_in Positive supply (V+). Operating range 2V to 30V (LM2903), absolute maximum 36V. Quiescent current typically 400 µA (600 µA max) at VS = 5V, no load.

Key specifications

Parameter Value
Type Dual differential comparator
Output Open-collector
Supply voltage 2 V to 36 V single, or +-1 V to +-18 V
Input offset voltage 2 mV typ
Response time 1.5 us typ
Operating temperature -40 C to 125 C

Ordering variants

Same part, different packaging or reel option.

  • LM2903D
  • LM2903DGK
  • LM2903P
  • LM2903PS
  • LM2903PW

CAD (KiCad official)

  • Symbol: lm2903.kicad_sym
  • Footprint: lm2903.kicad_mod
  • 3D model: SOIC-8 body from KiCad Package_SO/SOIC-8_3.9x4.9mm_P1.27mm.

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; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF