IEC 60738-1-2:2008

Overview

IEC 60738-1-2:2008 is a blank detail specification for directly heated positive step‑function temperature coefficient (PTC) thermistors intended for heating‑element applications (assessment level EZ). It is a supplementary document to the generic IEC 60738‑1 specification and prescribes the required style, layout and minimum content for detail specifications. Detail specifications that do not follow IEC 60738‑1‑2 layout and content requirements must not be described as being in accordance with IEC specifications. This publication is to be read in conjunction with IEC 60738‑1 (generic specification).

Key topics and technical requirements

The standard defines the mandatory elements and test schedules a detail specification must include, without prescribing additional technical values (those are inserted per device). Major topics covered:

• Identification and scope: how to identify the detail specification, thermistor type, outline drawing and assessment level (EZ).
• Mechanical and mounting data: specified methods of mounting, dimensional drawings and gauging references.
• Coating and terminations: insulation, coating material and color, termination types and solderability or alternative connection methods (welding, crimping).
• Electrical ratings and characteristics: parameters to be declared in the detail specification such as zero‑power resistance, switching temperature, maximum voltage, inrush or minimum resistance, residual or leakage current, and final surface temperature.
• Marking and ordering information: required marking details and minimum ordering data (style reference, max voltage, detail specification reference).
• Packaging and environmental aspects: packaging format, quantities, disposal notes, flammability and solvent resistance statements with corresponding test methods.
• Inspection and test schedules: mandatory lot‑by‑lot and periodic inspection groups (visual, dimensional, electrical tests, solderability, voltage proof, robustness of terminations, resistance to soldering heat, temperature cycling, vibration, bump/shock). Sampling plans reference IEC 60410 and test methods reference IEC 60068‑2‑58 where relevant.
• Documentation rules: how to present normative references and any deviations from the generic specification.

Applications and who uses it

IEC 60738‑1‑2 is used by:

• Thermistor manufacturers preparing IEC‑compliant detail specifications for PTC heating‑element components.
• Quality and compliance engineers verifying that supplier detail specifications meet IEC formatting and minimum content requirements.
• Procurement and component approval bodies that register and assess parts under IECQ/IEC quality assessment systems.
• Test laboratories implementing the specified inspection and sampling procedures when validating devices against a detail specification.

Use of this blank detail specification ensures consistent, auditable documentation for PTC thermistors used as heating elements and helps streamline qualification, sourcing and regulatory compliance.

Related standards

• IEC 60738‑1 (Generic specification for directly heated positive step‑function thermistors) - read in conjunction with IEC 60738‑1‑2
• IEC 60068‑2‑58 (Environmental testing - solderability & soldering heat for SMD)
• IEC 60410 (Sampling plans and procedures for inspection by attributes)