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SEMI G49-93 © SEMI 198 9, 1996 2 Table 3 Preform Weight Range ( g) Tolerance ( ± g) 1.8—4.0 0.15 > 4.0—8.0 0.20 > 8.0—< 15.0 0.25 15—< 1 6 0.50 16—40 1.00 > 40—8 0 2.00 > 80—150 3.00 > 150 4.00 NOTE …
SEMI G49-93 © SEMI 1989, 19961
SEMI G49-93
SPECIFICATION FOR PLASTIC MOLDING PREFORMS
1 Preface
1.1 Scope — This specification de fines the physical
requirements for preforms made with thermosetting
molding compounds.
1.2 Significance — Consistent pre form quality
enhances moldability and finished product reliability.
1.3 Units — SI or American Custo mary units may be
used at the customers discretion. This specification uses
SI units.
2 Applicable Document
2.1 ASTM Specification
1
ASTM D 792 — Specific Gravity and Density of Plastic
3 Terminology
molding preform — Mold compound powder
compressed into a cylindrical shape and size with
specified diameter, weight, and density.
scoring — Marks, grooves, scratches, or notches with
definite length, width, and depth physical
characteristics.
side porosity — Voids or holes with visible shape, size,
and depth that are detected around a molding preform.
4 Ordering Information
Purchase orders for preforms furnished to this
specification shall include the following items:
Molding compound name/type
Preform diameter
Preform weight
5 Preform Specification
5.1 Appearance — The preform appearance,
considering such items as side porosity, scoring and
breakage shall be defined by agreement between
supplier and customer.
5.2 Preform Density as Percentage of Molded Density
5.2.1 Specification — The minimum values for
Preform Density as a Percentage of Molded Density for
preforms of various diameters are shown in Table 1.
1 American Society for Testing and Materials, 100 Barr Harbor
Drive, West Conshohoken, PA 19428-2959
Table 1
Nominal Preform Diameter
(mm)
Percentage of Molded
Density (% Minimum)
< 16 87
> 16 85
5.2.2 Calculation
5.2.2.1 Preform Density — Measure w eight, height,
and diameter of preform.
Volume of approximately cylindrical preform (cm
3
) =
Height(cm) × π ×
4
m))Diameter(c Average(
2
Preform Density(g/cm
3
) =
)Preform(cm of Volume
Preform(g) ofWeight
3
5.2.2.2 Molded Part Density — Determine Molded
Part Density (g/cm
3
) per ASTM D 792.
5.2.2.3 Preform Density as Percentage of Model
Density.
Preform Density as Percentage
of Molded Density (%)
=
Preform Density
()
Molded Part Density
()
×100
5.3 Preform Diameter Tolerance — The tolerances on
preform diameters for variously sized preforms are
shown in Table 2.
Table 2
Nominal Preform Diameter
(mm) Tolerance (± mm)
< 16 0.30
> 16 1.25
5.4 Preform Weight Tolerance — The weight
tolerances for variously sized preforms are shown in
Table 3.
SEMI G49-93 © SEMI 1989, 1996 2
Table 3
Preform Weight Range (g) Tolerance (± g)
1.8—4.0 0.15
> 4.0—8.0 0.20
> 8.0—< 15.0 0.25
15—< 16 0.50
16—40 1.00
> 40—80 2.00
> 80—150 3.00
> 150 4.00
NOTE 1: The handling characteristics of some molding
compounds may require tolerances different from those
shown above.
6 Sampling Plan
The sampling plan for inspecting preforms and the
molding parameters shall be agreed between supplier
and customer.
NOTE 2: Recommendation — It is suggested that a
minimum of three preforms be measured. On each
preform, height and diameter measurements, to the
nearest 0.0254 mm (0.001 inch). Preform weight
measurements should be taken to the nearest 0.1 gram.
NOTICE: These standards do not purport to address
safety issues, if any, associated with their use. It is the
responsibility of the user of these standards to establish
appropriate safety and health practices and determine
the applicability of regulatory limitations prior to use.
SEMI makes no warranties or representations as to the
suitability of the standards set forth herein for any
particular application. The determination of the
suitability of the standard is solely the responsibility of
the user. Users are cautioned to refer to manufacturer’s
instructions, product labels, product data sheets, and
other relevant literature respecting any materials
mentioned herein. These standards are subject to
change without notice.
The user’s attention is called to the possibility that
compliance with this standard may require use of
copyrighted material or of an invention covered by
patent rights. By publication of this standard, SEMI
takes no position respecting the validity of any patent
rights or copyrights asserted in connection with any
item mentioned in this standard. Users of this standard
are expressly advised that determination of any such
patent rights or copyrights, and the risk of infringement
of such rights, are entirely their own responsibility.
Copyright by SEMI® (Semiconductor Equipment and Materials
International), 3081 Zanker Road, San Jose, CA 95134. Reproduction o
f
the contents in whole or in part is forbidden without express written
consent of SEMI.
SEMI G50-89 © SEMI 19891
SEMI G50-89
SPECIFICATION FOR CO-FIRED CERAMIC FINE PITCH LEADED AND
LEADLESS CHIP CARRIER PACKAGE CONSTRUCTIONS
1 Preface
This specification defines the standard requirements for
co-fired ceramic fine pitch chip carrier constructions,
including both top brazed leaded and top metallized
leadless configurations. These constructions are for
hermetic packaging of various devices, (e.g., high
speed, digital VLSI silicon devices), and next-level
interconnection to printed wiring assemblies and
modules by either lead solder attachment or by “leads
last” techniques.
2 Applicable Documents
2.1 ANSI Specification
1
ANSI Y14.5 — Dimensioning and Tolerancing
2.2 Federal Specification
2
QQ-N-290 — Nickel Plating
2.3 JEDEC Specification
3
JEDEC Publication 95 — Registered and Standard
Outlines for Solid State Products
2.4 Military Specifications
MIL-STD-105 — Sampling Procedures and Tables for
Inspection by Attributes
MIL-STD-883 — Test Methods and Procedures for
Microelectronics
MIL-STD-7883 — Brazing
MIL-I-23011 — Iron Nickel Alloys for Sealing to Glass
and Ceramics
MIL-M-38510 — General Specification for
Microcircuits
MIL-G-45204 — Gold Plating, Electrodeposited
3 Selected Definitions
blister (bubble) — ceramics — Any separation within
the ceramic which does not expose underlying ceramic
material.
blister (bubble) — metal — Any localized separation
within the metallization or between the metallization
1 ANSI, 1430 Broadway, New York, NY 10018
2 Military Standards, Naval Publications and Form Center, 5801
Tabor Ave., Philadelphia, PA 19120
3 JEDEC, 2001 Eye Street, N.W., Washington, D.C. 20006
and ceramic which does not expose underlying metal or
ceramic material.
bond finger — A region of refractory metallization
within the package cavity intended for wirebonding to a
microcircuit die pad.
braze — An alloy with a melting point equal to or
greater than 600°C.
burr — An adherent fragment of excess parent material
at the component edge.
chip-out — A region of ceramic missing from the
surface or edge of a package which does not go
completely through the package. Chip-out size is given
by its length, width, and depth from a projection of the
design planform (see Figure 1).
co-fired — A process or technology for manufacturing
products in which the ceramic and refractory
metallization are fired simultaneously.
contact pad — That metallized pattern to which the
leadframe is brazed.
crack — A cleavage or fracture, internal or external.
die-attach surface — A designated dimensional outline
area intended for die attach (see Figure 1).
foreign material — An adherent particle other than
parent material of that component.
laver — A dielectric sheet with or without metallization
that performs a discrete function as part of the package
construction.
lead offset — Lead centerlines must be aligned to
within 0.254 mm (0.010") of the centerline of
corresponding braze pad metallizations.
peeling (flaking) — Any separation from the basis
material that exposes the basis material.
projection — An adherent fragment of excess material
on the component surface.
pullback — The linear distance between the edge of the
ceramic and the first measurable metallization surface
(see Figure 3).
rundown — The linear distance down a vertical surface
from the top to the point of maximum metallization
over-hand (see Figure 3).