IEC 61837-2:2020 deals with standard outlines and terminal lead connections as they apply to surface-mounted devices (SMD) for frequency control and selection in ceramic enclosures, and is based on IEC 61240.
IEC 61837-2 Ed. 3.1 b:2020
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Surface mounted piezoelectric devices for frequency control and selection – Standard outlines and terminal lead connections – Part 2: Ceramic enclosures CONSOLIDATED EDITION