Home / Standards / GB/T 44069.13-2025 GB/T 44069.13-2025 Active Ferrite cores—Guidelines on dimensions and the limits of surface irregularities—Part 13: PQ-cores 铁氧体磁心 尺寸和表面缺陷极限导则 第13部分:PQ型磁心 Standard Type GBT ICS 29.100.10 CCS L 19 Status 现行 Issue Date 2025-12-31 Implementation 2026-04-01 Responsible Dept 工业和信息化部(电子) Drafting Unit N/A