Fairchild Packaging - Top Mark Search

Top Mark Definition

• Top mark refers to the device identification mark found on Fairchild semiconductor packages
• Top mark is used for determining whether a product is genuine and whether it matches your order
• Certain top marks refer to manufacturing date and assembly plant, and their values are dynamic
• This search tool uses symbols, e.g. &Y, to stand for dynamic top marks
• In search results, static marks are displayed in plain text, while dynamic marks are displayed in bold font with short descriptive text in parenthesis as link to help webpage
• Please check symbol list below for more details on dynamic top marks

Top Mark Record Example:
(Please click on the text link beside each symbol for details)

	Line 1:	&Y(Binary Year)
	Line 2:	&O(Plant Code)1234&C(Die Run)
	Line 3:	&.(Pin One)&O(Plant Code)&E(Space)&V(Binary Week)

SMA/SMB/SMC Products

	Line 1:	$Y(Logo)&Z(Assembly Plant)&3(Date Code)
	Line 2:	SMD

Top Mark Convention Symbol List
(please click on each symbol to see more details)

Symbol	Format	Description
$Y	FS or	Fairchild Semiconductor (FSC) logo graphic
&Z	Z	Designates the Assembly plant code
&4	XXYY	4-Digit Date code format
&3	XYY	3-Digit Date code format
&2	XY	2-Digit Date code format
&G	YY	Weekly Date code format
&T	TT	Die Run Traceability Code
&W	----	Six-Week Binary Datecoding Scheme
&V	---	Eight-Week Binary Datecoding Scheme
&Y	----	Binary Calendar Year Coding Scheme
&C	T	Single digit Die Run Code (last digit of the two digit code)
&U	U	Wafer Fab Code
&E		Designates Space
&.	.	Pin one dot (For SC70, SOT23, MLP binary marking type and WLCSP)
&H	Lot Number	Last 3 digit of workstream lot number
&O		Plant Code identifier on Tiny Logic Package
&K	KK	2-Digits Lot Run Traceability Code