IEC 61169-52:2015

Overview - IEC 61169-52:2015 (MMCX RF coaxial connectors)

IEC 61169-52:2015 is a sectional specification (SS) within the IEC 61169 series that defines mating face dimensions, gauging, tests and test schedules for the MMCX series of miniature snap‑on RF coaxial connectors. It applies to 50 Ω MMCX connectors with a normative operating frequency limit up to 6 GHz and is intended to guide the preparation of manufacturer or purchaser detail specifications (DS). The document prescribes dimensional data for grade 2 (general purpose) connectors, grade 0 standard test connectors, gauging procedures and selected tests from IEC 61169‑1.

Key topics and technical requirements

• Mating face dimensions: Detailed dimensional limits for connectors with pin and socket centre contacts (grade 2 and grade 0) to ensure interchangeability and electrical performance.
• Gauging information: Gauge pins and outer-contact gauges (sizing and retention gauges), with specified insertion and retention tests to verify contact fit and retention force.
• Quality assessment and tests:
  • Recommended acceptance and periodic test schedules.
  • Assessment levels M and H for inspection and test severity.
  • Procedures for qualification approval and maintenance, and quality conformance inspection.
• Performance characteristics: Recommended electrical/mechanical characteristics to consider when writing a DS, including reflection/frequency behaviour up to 6 GHz (see IEC 61169‑1 for measurement methods).
• Reference measurements and materials: Use of steel polished gauges; metric dimensions are normative.

Practical applications

IEC 61169-52 is used to:

• Create or evaluate detail specifications (DS) for MMCX connectors to ensure interoperability and consistent performance.
• Design and manufacture 50 Ω MMCX connectors for RF assemblies where small, snap‑on connectors are required.
• Define acceptance criteria and test schedules for production control, incoming inspection and qualification testing.
• Support test-lab procedures for insertion/retention, dimensional gauging and environmental/climatic testing (in combination with IEC 60068‑1).

Who should use this standard

• Connector manufacturers and tooling designers preparing product specifications.
• OEMs in telecommunications, RF instrumentation, automotive, aerospace and consumer electronics specifying MMCX interfaces.
• Test laboratories and quality assurance engineers implementing inspection, gauging and qualification programs.
• Procurement engineers preparing detail specifications for suppliers.

Related standards

• IEC 61169‑1:2013 - Generic requirements and measuring methods for RF connectors (normative reference).
• IEC 60068‑1 - Environmental testing: general and guidance (climatic categories).
• IEC 62037 (all parts) - Passive RF and microwave devices, intermodulation measurement.

Keywords: IEC 61169-52:2015, MMCX, RF coaxial connectors, 50 Ohm, snap-on coupling, 6 GHz, gauging, mating face dimensions, IEC 61169-1.