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SEMI T9-0200 © SEMI 1998, 2004 1 SEMI T9-0200 (Reapproved 1104) SPECIFICATION FOR MARKING OF METAL LEAD-FRAME STRIPS WITH A TWO-DIMENSIONAL DA TA MATRIX CODE SYMBOL This specificati on was technically approved by the Glo…

SEMI T8-0698

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SEMI T9-0200 © SEMI 1998, 2004 1

SEMI T9-0200 (Reapproved 1104)

SPECIFICATION FOR MARKING OF METAL LEAD-FRAME STRIPS

WITH A TWO-DIMENSIONAL DATA MATRIX CODE SYMBOL

This specification was technically approved by the Global Traceability Committee and is the direct

responsibility of the North American Traceability Committee. Current edition approved by the North

American Regional Standards Committee on July 11, 2004. Initially available at www.semi.org September

2004; to be published November 2004. Originally published in 1998; previously published April 2000.

1 Purpose

1.1 This specification provides a marking symbology

that can be used to mark metal lead-frame strips.

2 Scope

2.1 This specification defines the geometric and spatial

relationships and content (including the error checking

and correcting code) of rectangular two-dimensional (2-

D), machine-readable, binary Data Matrix symbology

for front-surface marking of metal lead-frame strips

(also called “strips”). It may be used in conjunction

with the alphanumeric marking codes specified in

SEMI M12 and SEMI M13 or the bar code specified in

SEMI T1.

2.2 This specification defines a 22-character default

message that is included in all marks, and option for up

to 50 additional characters, for a total of 72 message

characters. An optional shorter message contains 12 to

16 message characters; the resulting square field is

narrower but taller than the 22-character rectangular

one.

2.3 This specification provides a suggested location for

the code symbol. It also provides guidelines for

specifying other code locations when the suggested

location is not suitable for an application.

2.4 Although this specification does not specify the

marking techniques that may be employed when

complying with its requirements, it is assumed that the

symbol will be obtained by laser scribing individual

dots.

NOTE 1: A mark survivability experiment is being

conducted by the SEMI North American Traceability

committee. A report is available from SEMI: request

“Leadframe Mark Survivability Report” dated February,

1999.

2.5 Data Matrix symbology is applicable to a broad

range of lead-frame materials including copper and

Alloy 42 in both bare and plated conditions. The format

and algorithms of this code are based on two-

dimensional symbology specified in AIM International

Symbology Specification - Data Matrix.

2.6 This specification supports EIA Package Marking

Specification by enabling individual die tracking in the

manufacturing steps between die attach and device

packaging marking.

NOTE 2: Marking of each die, while in wafer form, prior to

dicing, could also accomplish this end.

NOTICE: This standard does not purport to address

safety issues, if any, associated with its use. It is the

responsibility of the users of this standard to establish

appropriate safety and health practices and determine

the applicability of regulatory or other limitations prior

to use.

3 Referenced Standards

3.1 SEMI Standards

SEMI M12 — Specification for Serial Alphanumeric

Marking of the Front Surface of Wafers

SEMI M13 — Specification for Alphanumeric Marking

of Silicon Wafers

SEMI T1 — Specification for Back Surface Bar Code

Marking of Silicon Wafers

3.2 AIM International Technical Specifications

AIM International Symbology Specification — Data

Matrix

3.3 ANSI Standards

ANSI/FACT-1 — Data Application Identifier Standard

ANSI X3.4 — American Standard Code for

Information Interchange (ASCII)

NOTE 3: This standard is equivalent to ISO 646, Information

Processing - ISO 7-bit Coded Character Set for Information

Exchange

1 AIM International, Inc., 125 Warrendale-Bayne Road , Warrendale,

PA 15086, Phone: 1 724 934 4470, Fax: 1 724 934 4495,

http://www.aimglobal.org/

2 American National Standards Institute, Headquarters: 1819 L

Street, NW, Washington, DC 20036, USA. Telephone: 202.293.8020;

Fax: 202.293.9287, New York Office: 11 West 42nd Street, New

York, NY 10036, USA. Telephone: 212.642.4900; Fax:

212.398.0023, Website: www.ansi.org

SEMI T9-0200 © SEMI 1998, 2004 2

ANSI MH10.8.2 — Data Application Identifier

Standard

NOTICE: Unless otherwise indicated, all documents

cited shall be the latest published versions.

4 Terminology

4.1 Definitions

4.1.1 alignment bar, of a data matrix code symbol — a

solid line of contiguous filled cells abutting a line of

alternatively filled and empty cells [AIM International

Symbology Specification - Data Matrix].

4.1.2 binary values — a dot in the substrate surface

indicates the binary value 1. The absence of a dot, or a

smooth surface surrounding a cell center point,

indicates the binary value 0.

4.1.3 border column — the outermost column of a data

matrix code symbol. This column is a portion of the

finder pattern.

4.1.4 border row — the outermost row of a data matrix

code symbol. This row is a portion of the finder pattern.

4.1.5 cell, of a data matrix code symbol — the area

within which a dot may be placed to indicate a binary

value.

4.1.6 cell center point, of an array — the point at

which the centerline of a row intersects the centerline of

a column.

4.1.7 cell spacing, of an array — the (equal) vertical or

horizontal distance between the cell center points of

contiguous cells.

4.1.8 center line, of a row or column — the line

positioned parallel to, and spaced equally between, the

boundary lines of the row or column.

4.1.9 central area, of a cell — the area enclosed by a

circle centered at the cell center point; used by code

readers to sense the binary value of the cell.

4.1.10 data matrix code symbol — a two-dimensional

array of square cells arranged in contiguous rows and

columns. In certain ECC200 symbols, data regions are

separated by alignment patterns. The data region is

surrounded by a finder pattern [AIM International

Symbology Specification - Data Matrix].

4.1.11 dot — a localized region with a reflectance

which differs from that of the surrounding surface.

3 International Organization for Standardization, ISO Central

Secretariat, 1, rue de Varembé, Case postale 56, CH-1211 Geneva 20,

Switzerland. Telephone: 41.22.749.01.11; Fax: 41.22.733.34.30,

Website: www.iso.ch

NOTE 4: To assure reading efficiency, a minimum contrast

of 30% is required between the reflectance value of a dot and

the surrounding substrate surface. Various densitometers can

provide such measurements nondestructively.

4.1.12 dot misalignment, within a cell — the distance

between the physical center point of a dot and the cell

center point.

4.1.13 finder pattern, of a data matrix code symbol —

a perimeter to the data region. Two adjacent sides

contain dots in every cell; these are used primarily to

define physical size, orientation, and symbol distortion.

The two opposite sides are made up of cells containing

dots in alternate cells [AIM International Symbology

Specification - Data Matrix].

4.1.14 orientation corner, of a lead-frame strip — the

strip corner used to assure correct die assembly

orientation. It is denoted by an identification mark.

4.1.15 quiet zone — an unmarked background area that

surrounds the entire code symbol.

4.1.16 reference point, of a data matrix code symbol —

the physical center point of a cell common to a

designated row and column, used to identify the

physical location of the symbol on the object being

marked with the symbol.

NOTE 5: The reference point is at a fixed location on the

object. Different cells may be chosen as the reference point,

depending on the desired orientation of the symbol on the

object and on the size variability of the symbol. The particular

cell to be used as the reference point must be specified for

each application.

5 Ordering Information

5.1 Purchase orders for lead-frame strips furnished to

this specification shall include the following items:

5.1.1 Message Characters

5.1.1.1 Quantity (12 to mm, where mm = 13 to 16; or

22 to nn, where nn is 23 to 72).

5.1.1.2 Content of Message Characters 13 to 16, or 23–

up, if present.

5.1.2 Location of Mark, if different from Section 6.3