GB/T 8553-2023Generic specification for enclosures for crystal units (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 8553-1987 "General Specification for Crystal Boxes". Compared with GB/T 8553-1987, except for structural adjustment and editing In addition to the modifications, the main technical changes are as follows.

a) The technical requirements and test methods for materials are deleted (see 3.2 of the 1987 edition);

b) Added crystal box content for SMD packaging and ceramic packaging types [see 4.6.2.2b), 4.6.2.3.2, 4.7, 4.8.1.3, 4.8.2.3, 4.10.2.2, 4.12.1.2.2, Table 2, Table 3];

c) Added appearance, coating thickness requirements and test methods (see 4.3);

d) Added insulation resistance requirements (see 4.4);

e) Added requirements for flexural strength (see 4.7);

f) Added requirements for air tightness of the base after encapsulation (see 4.9);

g) Added limit requirements for environmentally hazardous substances (see Chapter 6).

1 Scope

This document specifies the terms and definitions, technical requirements, test methods, packaging, marking, storage and transportation of crystal boxes for quartz crystal components.

This document applies to crystal boxes for quartz crystal components, including bases, covers, leads, soldering pins, etc.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 2421-2020 Environmental Testing Overview and Guidelines

GB/T 2422-2012 Guidelines for preparation of environmental testing test methods Terms and definitions

GB/T 2423.3-2016 Environmental testing Part 2: Test methods Test Cab. Constant humidity and heat test

GB/T 2423.17-2008 Environmental testing of electrical and electronic products Part 2: Test methods Test Ka. Salt spray

GB/T 2423.22-2012 Environmental testing Part 2: Test methods Test N. Temperature change

GB/T 2423.23-2013 Environmental testing Part 2: Test methods Test Q. Sealing

GB/T 2423.50-2012 Environmental testing Part 2: Test methods Test Cy. Constant moist heat is mainly used for processing components Quick test

GB/T 2423.60-2008 Environmental testing of electrical and electronic products Part 2: Test methods Test U. Terminal and overall safety Assembly strength

GB/T 2828.1-2012 Enumeration sampling inspection procedures Part 1: Batch-by-batch inspection sampling retrieved by acceptance quality limit (AQL) plan

GB/T 2829-2002 Periodic inspection counting sampling procedures and tables (applicable to inspection of process stability)

GB/T 5593-2015 Structural ceramic materials for electronic components

GB/T 16921-2005 Metal coating coating thickness measurement X-ray spectrometry

GB/T 26572-2011 Limit requirements for restricted substances in electronic and electrical products

IEC 60068-2-20:2021 Environmental testing Part 2-20.Test tests Ta and Tb. Solderability and resistance of leaded devices

3 Terms and definitions

The terms and definitions defined in GB/T 2422-2012 and the following apply to this document.