Collection/Texas Instruments/Source-listed TI 54LS139A specimen; die marked LS155A

ZeptoBars ·CC BY 3.0· Die photograph · Original retained in the acquisition archive. Display resized to at most 1920 pixels; responsive AVIF/WebP encodings. No crop, recoloring, annotations, or generated detail.

Origin & contributions

Original source · Retrieved 2026-09-06

ZeptoBars (publishing archive and CC BY licensor; individual photographer uncredited) · archive · Included in this image

Credit the photograph title and ZeptoBars; link to the original source page and CC BY 3.0; indicate modifications. No endorsement is implied.

SPECIMEN / DATE NOT RECORDED

Source-listed TI 54LS139A specimen; die marked LS155A

A photographed logic specimen listed as TI 54LS139A by the archive. The visible die bears an LS155A marking, so the exact relationship between the part label and silicon marking remains unresolved.

Texas InstrumentsTTL logic

Research connections

CompanyTexas Instruments ↗SeriesTTL logic ↗

Specifications

2 SOURCE-LINKED FIELDS

Photographed specimen	Published analysisZeptoBars Scope: physical-specimen
Photographic scope	Published analysisZeptoBars Scope: physical-specimen

THE VISUAL EVIDENCE

Visual sources

1 DOCUMENTED SOURCES

Hosted image provenance · 1

Die photographHosted in Museum

Source-listed TI 54LS139A specimen; die marked LS155A — Die photograph

Zeptobars · ZeptoBars

4,230 × 3,583 pxTechnical archive / analysis

The archive lists TI 54LS139A and links this HD photograph. Museum visual review observes LS155A on the die. This discrepancy is retained; no exact function or shared-die SKU match is inferred.

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Rights, provenance & link history

Rights status: CC LICENSED
Licence: CC BY 3.0 ↗
Local hosting / thumbnails / hotlinking: Allowed / Allowed / Not enabled
Attribution: Source-listed TI 54LS139A specimen; die marked LS155A — ZeptoBars / CC BY 3.0
Identity / confidence: matched / high
Evidence reviewed: 2026-09-06
Link checked: Not yet checked · unchecked

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Record identity & scope

specimen · Source-listed TI 54LS139A specimen; die marked LS155A

What this photograph shows

The archive lists TI 54LS139A and links this HD photograph. Museum visual review observes LS155A on the die. This discrepancy is retained; no exact function or shared-die SKU match is inferred.