I. Component Library Management Specifications (Reference Standard: IPC-782A, classic content for reference only)

(I)

When conducting a new PCB layout, circuit designers must copy the latest component library from the component library administrator. If components beyond the existing library are required, designers may either create a new library by themselves and file it with the administrator, or provide component dimension data for the administrator to create the library.

(II)

If circuit designers encounter component library-related issues during PCB layout or production, they shall promptly report to the administrator, who will then make modifications and file the changes for record.

(III)

When modifying a PCB, designers must re-copy the component library and refer to the Component Library Modification Record Form and Component Library Update Record Form to determine whether an update to the component library is necessary.

• Appendix Table 1: Component Library Update Record Form
• Appendix Table 2: Component Library Modification Record Form

II. Component Library Directory

(I)

LIB-V3.0 is divided into the Schematic Component Library and the PCB Component Library.

Schematic Component Library:

The Schematic Component Library is further divided into SMC (Surface Mount Component Library) and THC (Through-Hole Component Library).

Key Notes on Translation:

1. Term Consistency: Industry-standard terms are adopted, e.g., "PCB 排版" as "PCB layout" (common in electronic design), "贴片元件库" as "Surface Mount Component Library" (abbreviated to SMC per industry practice), and "插件元件库" as "Through-Hole Component Library" (abbreviated to THC).
2. Document Structure: Hierarchical markers (I/II, (I)/(II)/(III)) are retained to match the original document’s logic; appendices and subcategories are formatted with clear indentation for readability.
3. Regulatory Tone: Verbs like "must", "shall", and "promptly" are used to reflect the normative nature of management specifications, ensuring alignment with the original document’s authoritative tone.

(II) The PCB Component Library is divided into SMC (Surface Mount Component Library) and THC (Through-Hole Component Library).

III. Naming Instructions for Schematic Components

(I) Surface Mount Component Library (SMC)

Note: ⑴ MARK is stored in SM-OTHER;

⑵ Special components shall be named separately.

(II) Through-Hole Component Library (THC)

IV. Naming Instructions for PCB Component Footprints

(I) Surface Mount Component Library (SMC)

Note:

(1) Special components shall be named separately;

(2) The angle of surface mount components takes the direction shown in the diagram as 0 degrees;

(3) Except for special components, the geometric center of the component's pad shall be taken as the coordinate origin for surface mount components;

(II) Through-Hole Components

Note: (1) TH-OTHER refers to components outside the previous categories, such as crystals, surface acoustic wave devices, etc. All components in this category are named after their model numbers, and correspond one-to-one with the schematic diagram;

V. Component Size Specifications

(I) Size specifications for surface mount components: The definition of pad sizes for surface mount components shall comply with IPC standards or component specifications.

1. Chip Resistors

Component Size　　Pad Size

2、Chip Capacitors

(II) Specifications for pad sizes of through-hole components: The pad sizes of through-hole components shall refer to the pad sizes of through-hole components in the CAD system of the TV company.

VI. Calculation formula for SMD component pads

Take Chip Resistors as an example.

Among them: For the component pad size, Z = Zmax; G = Gmin; X = Xmax.

Lmin: Minimum length of the component (shall be specified in the component specification sheet)

Smin: Shall be specified in the component specification sheet

Wmin: Shall be specified in the component specification sheet

JTmin: If not specified in the specification sheet, it shall be estimated as 0.4-0.6mm

JHmin: If not specified in the specification sheet, it shall be estimated as 0-0.2mm

Jgmin: If not specified in the specification sheet, it shall be estimated as -0.02-0.02mm

 

F: PCB processing accuracy. If not specified, it shall be estimated as 1.0mm.

P: Component placement accuracy. If not specified, it shall be estimated as 1.0mm.

C: Component accuracy, which shall be specified in the component specification sheet.

Note: If the component specification sheet specifies the pad size, the library shall be created according to the value specified in the specification sheet. If the component specification sheet does not specify the component size, the pad size shall be calculated according to the above formula.

PCB Component Library Update Record Form (Appendix 1)

PCB Component Library Modification Record Form (Appendix 2)