IEC 60191-4:2002 pdf download

IEC 60191-4:2002 pdf download.Mechanical standardization of semiconductor devices – Part 4: Coding system and classification into forms of package outlines for semiconductor device packages
1 Scope
This International Standard describes a method for the designation of package outlines and for the classification of forms of package outlines for semiconductor devices and a systematic method for generating universal descriptive designators for semiconductor device packages. The descriptive designator provides a useful communication tool but has no implied control for assuring package interchangeability.
2 Coding system of package outlines for semiconductor devices
The following coding system will be used in the publications concerning mechanical standardization: – first: a three-digit serial number (000 to 999); – second: a single reference letter indicating the form as shown in table 1; – third: a two-digit serial number (00 to 99) to indicate a variant of an outline drawing. The use of prefix P to indicate a provisional drawing remains unchanged.
4 Coding system for semiconductor-device packages
4.1 General The standard coding system is a method for identifying the physical features of an electronic device package family. The system is predicated upon a minimum two-character designator, which indicates the package outline style. This designator can be extended, through the use of optional, user-selected fields, to provide additional package information such as terminal position and count, terminal form, package shape, and predominant body material. 4.2 New descriptive codes If a new package that does not conform to one of the designated field character codes is being proposed, a new code may be recommended for standardization. 4.3 Descriptive designators The package outline style code is the only compulsory field within this descriptive designation system. Additional information may be provided using optional prefixes and suffixes described by the system. In general, these fields are independent of one another. Unless otherwise indicated herein, the users of this system may pick and choose which of these fields they wish to implement for their specific application (see figure 1). The descriptive designator may be extended with additional information, provided this information is separated from the descriptive designator by a slash (/) (see 4.3.6).4.3.1 Minimum descriptive designator The minimum descriptive designator is a two-letter code that classifies device packages into standard package outline styles. These styles identify general external physical features. Common two-letter descriptive codes or abbreviations are included, such as CC, FP, SO, GA. Figure A.1 shows two-letter codes for various device package outline styles and depicts examples of each. Table 1 lists the two-letter package-outline-style codes described in clause 5.
4.3.2 Terminal-position prefix The two-letter, package-outline-style code may be supplemented with a single-letter prefix that identifies the physical terminal positions or, if applicable, the interconnect land pattern. Examples of three-letter designators include common acronyms or abbreviations, such as DIP, LCC (QCC preferred), PGA, QFP, SIP, ZIP. NOTE 1 A terminal is defined as an externally available point of connection. NOTE 2 The proper terminal-position prefix is determined by the interconnect land structure. For example, the code for a single row of terminals formed into a staggered configuration would be “Z”. Table 2 gives a list of one-letter, terminal-position prefix codes. 4.3.3 Package-body-material prefix The three-letter descriptive designator (see 4.3.2) may be further supplemented by a single- letter prefix that identifies the predominant package-body material. This prefix shall not be used unless the terminal-position prefix described in 4.3.2 is also used. Examples of such four- letter descriptive designators include common acronyms or abbreviations, such as CDIP, PDIP, PLCC (PQCC preferred), MELF, PQFP. Table 3 gives a list of one-letter package-body-material prefix codes. If the package-body material is other than one of those defined in table 3, the letter “X” shall be used within the descriptive designator to signify a special or new material and shall later be replaced with an IEC-approved code.