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SEMI E5-1296 Wafer Map Specification

Like most wafer maps, the E5-1296 starts with a header section, followed by the bin map section.

E5-1296 Header


the curly bracket indicates that a list of parameters is enclosed.


Wafer Identifier. A string (enclosed in double quotes) up to 16 characters long. Usually matches the information scribed onto the wafer. Spaces are allowed inside of the double quotes.


A string describing the map type. Most typical would be ASCII.


The character used to present locations for which there is no data. Use the "." for maximum compatibility.


The number of rows in the array


The number of columns in the array


The position of the flat or notch on the wafer for the data presented in the map section. 0 | 90 | 180 | 270


A string identifying the supplier of the wafer. Enclose in double quotes. Max 16 characters.


recently saw a file that used SUPPLIER as the keyword instead of SUPPLIER_NAME.


An string identifier generated by the wafer supplier to group together a number of wafers - either by process, test or other grouping.


recently ran across a file that had keyword WAFER_SIZE in it.


The pitch between devices along the X axis. Always in units of MM. (5 digits: two to the left of the implied decimal point and two to the right of the implied decimal point. So a number such as 620 represents 00.620 mm)


The pitch between devices along the Y axis. Always in units of MM. (5 digits)


The number of ref dies (only 1 integer may be used so max = 9)


The X and Y array positions of the reference die(s).


Recently ran across a file that had this keyword in it. It appears to indicate the number of bin codes defined. This number does not appear to include the NULL Bin definition.


Each BIN line contains four fields which are space separated. When devices are tested (or even skipped) they are assigned a bin code.


recently ran across this keyword that seems to define either the total number of devices tested or the total number of passed devices.

MAP = {

The keyword indicating that the map data follows.

Each map consists of a row of bin codes starting at the top left of the wafer. There are no spaces between the bin codes. While other types of maps may be supported, we have not seen any such E5-1296 files that use a map other than single character ASCII.



two right curly brackets are needed at the end of the file to close the WAFER_MAP= { and the MAP= { sections.

Naming Convention

E5-1296 map files are generated based on the wafer's scribed identification. The WAFER_ID is then followed by the suffix .txt indicating that it is a text file.


Wafer ID = A12345-01A5 Filename: A12345-01A5.txt

Flat Orientation

SEMI E5-1296 Wafer Flat/Notch Orientation

Reference Die

The reference die is the top right die with probe marks (i.e. the top right tested die)

origin, array axes and reference die location

Ugly Die

Die that fall within the 3 mm edge of the wafer are classed as "Not_Used" (N) -- often known as Ugly Die.

SEMI E5-1296 die which intersect the 3 mm margin are considered ugly and markes as Not_Used (N)