IEC 61191-1:2018

Overview

IEC 61191-1:2018 - Printed board assemblies - Part 1: Generic specification - defines generic requirements for producing quality soldered electrical and electronic assemblies using surface mount and related assembly technologies. The standard prescribes requirements for materials, methods and verification criteria and includes recommendations for good manufacturing practice. The 2018 edition aligns acceptance criteria with IPC‑A‑610F, updates terminology (from “assembly drawing” to assembly documentation), corrects IEC references, rewrites Clause 9 (cleanliness/residues) and removes Annex B.

Key topics and technical requirements

• Materials and compatibility: requirements for solder, flux, solder paste, adhesives, cleaning agents and polymeric coatings.
• Component and board requirements: solderability, solderability maintenance, preconditioning and lead preparation.
• Assembly processes: process control for reflow soldering, manual soldering, mechanized immersion and related heat application methods.
• Process control and documentation: requirements flowdown, conformance documentation, visual aids and assembly documentation to ensure consistent manufacturing.
• Cleanliness and residues: rewritten Clause 9 addresses pre/post-solder cleaning, verification, ionic/non‑ionic residues, SIR considerations and cleanliness verification methods.
• Inspection and acceptance: acceptance criteria and process control limits (now consistent with IPC‑A‑610F), defect classification and corrective action limits.
• Facilities and personnel: ESD control, environmental conditions (temperature, humidity, lighting), cleanrooms and proficiency of personnel for design and manufacturing.
• Equipment and process development: machine maintenance, process development for reflow and immersion soldering, thermal dissipation and handling.

Practical applications and users

IEC 61191-1:2018 is intended for organizations that design, assemble, inspect or procure printed board assemblies:

• Contract manufacturers (CMs) and original equipment manufacturers (OEMs) for establishing process controls and acceptance criteria.
• Process engineers and production managers implementing reliable reflow and soldering processes.
• Quality assurance and inspection teams using standardized acceptance and cleanliness criteria.
• Purchasing and compliance teams specifying assembly documentation and materials.
  The standard helps reduce assembly defects, ensure solder joint reliability, and harmonize acceptance criteria across global supply chains.

Related standards

• IPC‑A‑610F - Acceptance criteria for electronic assemblies (IEC 61191-1:2018 updated to be compliant).
• Other IEC standards referenced within IEC 61191-1 for specific test methods and materials compatibility.

Keywords: IEC 61191-1:2018, printed board assemblies, surface mount, soldered assemblies, reflow soldering, solderability, cleanliness, IPC‑A‑610F.