Maybe it is not an inductor problem at all...
Could the installation process be at fault?
For instance- could it be a soldering problem?
Bad solder joints?
Or maybe good solder joints that get cracked by poor
handling after installation?
Perhaps the inductors use lead-free solder?
If your board and the solder process are not compatible
with lead-free, this can cause bad solder joints.
( Not that I have ever made a mistake like that... :> ).
Best Regards,
Patrick Conway
[email protected]
From: [email protected] [mailto:[email protected]] On Behalf Of
[email protected]
Sent: Friday, October 06, 2006 7:02 AM
To: [email protected]; [email protected]
Subject: Inductor mystery
Dear Experts,
We use the inductor part "1812CS-102XJLC" of Coilcraft in our RFID
product as EMI filter. Continuously we face one issue, about 20 to 30 %
products are functionally failing due to this inductor. While we change
the inductor alone the product passes the functional tests. Hence we
studied the characteristics of the inductor.
Measurements carried out using the Agilent Impedance analyser
4294A shows the failing inductors and passing inductors are identical
with respect to the below listed parameters for the entire measuring
range of 40 Hz to 110 MHz. Our frequency of operation is 13.56 MHz and
both the failing inductors and passing inductors are identical in this
particular frequency also with respect to the below parameters.
Is there anything else than the below listed parameters critical
for an inductor? Has any one of you come across such an issue in your
devices?
I request your help.
a. Ra.c
b. Conductance - 'G'
c. Reactance - 'X'
d. Susceptance - 'B'
e. Impedance - 'Z'
f. Phase angle of the impedance
g. Value of R, L & C measured using the equivalent circuit method of
measurement.
Sincerely
K.Balasubramanian
Project Leader - Hardware.
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