Overview
IEC 62319-1-1:2005 is a blank detail specification for polymeric thermistors-specifically directly heated, positive step-function PTC (positive temperature coefficient) devices used in current limiting applications. It is a supplementary document to the generic specification (IEC 62319-1) that prescribes the required style, layout and minimum content of detail specifications. Detail specifications not meeting these requirements shall not be described as being in accordance with IEC publications.
Key topics and requirements
The standard establishes the minimum content and structure that a detail specification must include. Important technical topics covered are:
- Identification elements: predefined positions for issuer, document numbers, thermistor type, outline drawing, application group and reference data.
- General data: mounting methods, dimensional drawings (metric/imperial), coating (material, insulating/non‑insulating, colour), terminations (solderability or alternative connection methods), flammability and solvent resistance.
- Electrical data and ratings: units and tolerances or limit values for parameters such as zero‑power resistance, operating temperature range, maximum voltage, trip current, hold current, residual current, maximum current, fault current, time‑to‑trip and power dissipation.
- Marking and ordering: mandatory marking details and the required ordering information referencing the detail specification number.
- Packaging: bulk or taped packaging, dimensions and quantity of packs, and disposal methods.
- Inspection and test schedules: mandatory procedures for qualification and quality conformance inspection, including lot‑by‑lot and periodic test tables, sampling plans (per IEC 60410), destructive vs. non‑destructive testing, and 100% production testing followed by sampling re‑inspection.
- Normative references: the document mandates use of referenced standards such as IEC 60068 (environmental testing), IEC 60410 (sampling plans) and the generic IEC 62319‑1.
Applications and who uses it
IEC 62319-1-1 is primarily used by:
- Manufacturers of polymeric PTC current‑limiting thermistors to prepare compliant detail specifications for product families.
- Test laboratories and quality assurance teams to design inspection/test schedules and sampling criteria.
- Procurement and component engineers who need unambiguous specification sheets for sourcing and qualification.
- Standards committees and certification bodies ensuring detail specifications meet IEC formatting and content requirements.
This standard helps ensure consistent documentation, reliable quality conformance inspection, and clear communication of essential electrical, mechanical and test data for current‑limiting PTC thermistors.
Related standards
- IEC 62319-1 (Generic specification)
- IEC 60068 (Environmental testing)
- IEC 60410 (Sampling plans and procedures)
Keywords: IEC 62319-1-1, polymeric thermistors, positive temperature coefficient, PTC, current limiting, blank detail specification, quality conformance inspection, IEC standard.