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Requirements for Soldered Electrical and Electronic Assemblies Flashcards

7 cards from real CIT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Requirements for Soldered Electrical and Electronic Assemblies flashcards as text

  1. When inspecting a through-hole solder joint per IPC J-STD-001, which condition is classified as a 'defect' for Class 3?

    Answer: Solder fill of 75% hole fill

    Class 3 requires a minimum of 75% vertical fill of the plated through-hole — wait, actually Class 3 requires minimum 75% fill, but let me correct: Class 3 requires minimum 75% hole fill; less than 75% is a defect.

  2. What does the 'J-STD' designation stand for in IPC J-STD-001?

    Answer: Joint Standard

    J-STD stands for 'Joint Standard,' indicating the document was developed jointly by IPC and EIA (Electronic Industries Alliance).

  3. Per IPC J-STD-001, what is required when mixing lead-free and tin-lead solders in a production environment?

    Answer: Separate process controls, documentation, and equipment to prevent contamination

    Mixing lead-free and tin-lead alloys (mixed metallurgy) requires segregated equipment and documentation due to reliability concerns from alloy incompatibility.

  4. Which IPC document is the companion inspection document to IPC J-STD-001 for solder joint acceptability?

    Answer: IPC-A-610

    IPC-A-610 (Acceptability of Electronic Assemblies) is the companion inspection document that provides visual criteria and illustrations for accepting or rejecting solder joints.

  5. Per IPC J-STD-001, which condition describes 'non-wetting' in a solder joint?

    Answer: Molten solder fails to adhere to the base metal surface at all

    Non-wetting means the solder does not bond to the base metal surface at all, typically because of heavy oxidation or contamination on the substrate.

  6. What is the minimum PCB preheat temperature requirement purpose in the IPC J-STD-001 soldering process?

    Answer: To reduce thermal shock, activate flux, and drive off moisture before full soldering temperature

    Preheating reduces thermal shock to components and boards, activates flux chemistry, and evaporates solvents and moisture to prevent solder defects like splattering.

  7. Under IPC J-STD-001, what requirement governs the use of solder paste that has exceeded its shelf life?

    Answer: It must be discarded and cannot be used for production

    Solder paste that has exceeded its manufacturer-specified shelf life must be discarded; using expired paste risks poor print quality, insufficient flux activity, and solder defects.