SEMI G75.11-0698 TEST METHOD FOR MEASUREMENT OF THE.pdf

SEM G75.11-0698
TEST METHOD FOR MEASUREMENT OF THE DIELECTRIC
CONSTANT AND DISSIPATION FACTOR OF THE LEADFRAME TAPE
1 Purpose
Following is the Mutual Inductance Bridge Method
I Capacitance is measured for tape specimens and
Transformer Bridge Method
nd dissipation factor of the tapes are calculated from
Powcr sourcc
the results
Shicldcd transformer
2 Referenced Documents
Constant conductancc
m. d: Variable rc
NOTE As listed or revised all documents cited shall
C\: Capacitance of samplc
be the latest publications of adopted standards
2.1、 IIS Specificalion
3.2 Electrostatically and electromagnetically shielded
/S K 6911-testing Methods for Thermosetting
Plastics
3.3 Micrometer with an accuracy of 0.001 mm
3.4 Humidity-controlled storage box
3 Equipment
3. 1 Measurement Circmit-see JS K 6911 5.142(1)4 Sampling
(b)-(d )and Figure
4.1 The sampling is one sample per one lot. The ven
dor must report the definition of lot if the customer
5 Preparation of Specimens
5.1 The specimen shall be punched out from tape, the
T2
diameter of which must be no less than that of the
ite electrode
5.2 Place the specimens in the constant humidity cabi
net at23士2Cand50士5% RH for90土2 hours.This
may also be done after the electrodes are formed
d
6 Procedure
Fj
6.1 Measure the thickness of specimen with the
Mutual Inductance Bridge Method
micrometer Attach the electrodes to the specimen
Electrodes are formed by conductive epoxy printing or
aluminum evaporation shown in Figures 2 and 3
NOTE I: The electrodes shall be formed on both sides
pe
NOTE 2 Suggested dimensions for the electrodes are
shown in Table I (d: -d2 ) They should be at least 10
mes the tape thick
I Japanese Standards Associalion, 1-24, Akasaka 4 home
SEMI G75.11-06980SEMI1998
Table 1. Suggested Dimension of Electrodes
(or Tape Thickness 0/.063-0077 mm,
18 m
d>
20 mm
d
mm
6.2 Connect the specimen in the position of C, as
shown in Figure I, and balance the bridge by adjusting
the measuring condenser Cs and conductance shifter
In this state measure the C. value. the conductance
value between m andd resistance between Iand
m and rand mof the conductance shifter in Fig
ure I
O
Tape Front-side Electrode Dosi
ligure 2
Electrodes Formed on the Leadframe Tape
Mlain Electrode
Spec
Figure 3
lelectrode Connection
SEMI G75.11-0698SEMI1998