IEC 61754-3-1996 PDF

Full title and description

St IEC 61754-3-1996 — Fibre optic connector interfaces — Part 3: Type LSA connector family. This international standard specifies the standard interface dimensions and mating geometry for the Type LSA single‑position fibre‑optic connector family (characterised by a nominal 2.5 mm ferrule diameter and screw‑coupling nut).

Abstract

IEC 61754-3:1996 defines the mechanical interface dimensions, mating interfaces (plug and adaptor), and intermateability requirements for the Type LSA connector family used in fibre‑optic equipment. The document provides dimensional drawings, tolerances, interface references and notes on alignment and ferrule characteristics to ensure interoperability between compliant components.

General information

• Status: Published (base publication; adopted by various national bodies).
• Publication date: 12 December 1996.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 33.180.20 — Fibre optic interconnecting devices.
• Edition / version: Edition 1.0 (1996).
• Number of pages: 17 (base publication).

Scope

This part of IEC 61754 establishes the standard mechanical interface dimensions and mating geometry for the Type LSA connector family. It covers the single‑position plug interface (plug), the corresponding adaptor/receptacle interfaces, keying/orientation features, ferrule dimensions and tolerances, and the gauges and tests needed to verify intermateability. The standard is intended to ensure mechanical interchangeability of LSA connectors and associated adaptors and receptacles.

Key topics and requirements

• Definition of Interface 3‑1 (simplex plug) and Interface 3‑2 (adaptor/receptacle) with dimensional drawings and tolerance tables.
• Nominal ferrule diameter and ferrule‑end geometry: 2.5 mm nominal ferrule and related spring/ferrule loading along the optical axis.
• Screw‑coupling nut design and mechanical mating features (single male key for orientation/rotation control).
• Intermateability requirements and use of gauges to verify alignment features and adaptor acceptance.
• Dimensional tolerances, reference datums and notes on assembly/clearance to ensure reliable mating and mechanical stability.

Typical use and users

Manufacturers of fibre‑optic connectors, adaptors and active device receptacles; product designers and mechanical engineers working on fibre‑optic equipment housings; test laboratories and QA groups verifying connector intermateability; procurement/specification engineers in telecom, datacom, broadcast and industrial communications selecting components that must physically intermate with LSA family connectors.

Related standards

IEC 61754 is a multipart series covering mechanical interface definitions for various connector families. Related parts include other IEC 61754 parts such as the Type SC family (IEC 61754-4) and later parts for MPO/MTP and other families — national and regional adoptions (for example EN 61754-3:2002 / DIN EN 61754-3) exist where IEC 61754-3:1996 has been incorporated or adopted. These related documents are used together when specifying intermateability across different connector families and active device receptacles.

Keywords

LSA connector, fibre optic connector interfaces, 2.5 mm ferrule, screw‑coupling, intermateability, IEC 61754 series, TC 86/SC 86B, mechanical interface dimensions.

FAQ

Q: What is this standard?

A: IEC 61754-3:1996 is an international standard that specifies the mechanical interface dimensions and mating geometry for the Type LSA family of fibre‑optic connectors (single‑position plug and associated adaptors/receptacles).

Q: What does it cover?

A: It covers dimensional drawings, tolerances, ferrule details (nominal 2.5 mm ferrule), screw‑coupling mating features, keying/orientation, and intermateability verification methods (including gauges and referenced interface numbers).

Q: Who typically uses it?

A: Connector and adaptor manufacturers, equipment designers, test laboratories, standards committees, and procurement/specification engineers in telecom/datacom and related industries use this standard to ensure mechanical compatibility of LSA‑family connectors.

Q: Is it current or superseded?

A: IEC 61754-3 was published on 12 December 1996 (Edition 1.0). It has been adopted in regional standards (for example EN 61754‑3:2002) and remains the base IEC publication; the IEC webstore lists its stability date and publication metadata. Users should check national adoption documents and the IEC webstore for the latest status or any amendments before finalising specifications.

Q: Is it part of a series?

A: Yes — IEC 61754 is a multipart series of standards titled "Fibre optic connector interfaces"; each part defines the interface for a particular connector family (for example SC is covered by IEC 61754‑4, MPO by other parts). IEC TC 86/SC 86B is the responsible committee.

Q: What are the key keywords?

A: LSA, fibre optic connector, ferrule 2.5 mm, screw coupling, intermateability, interface dimensions, IEC 61754.