T499_1 Datasheet, PDF (1/3 Pages) Kemet Corporation – High Temperature (+175) Tantalum SMT Capaci

Product Update – T499 High Temperature (+175°C) Tantalum SMT Capacitors
KEMET Electronics Corp. P. O. Box 5928 Greenville, SC 29606 [phone] www.kemet.com
The tantalum SMT capacitor in its solid-state structure
is typically rated as capable of 125°C applications. The
T498 tantalum surface mount capacitor introduced earlier
this year has a maximum temperature rating of 150°C.
Now with the introduction of the T499, the temperature
range capability has been extended to +175°C. The differ-
ence between the T499 and the standard tantalum capaci-
tor lies within its material set and design. The materials
changed include the carbon, the silver epoxy, the silver
paint, the plastic molded encapsulant, and the leadframe.
These materials also differ from those changes incorpo-
rated with the T498. These materials still contain no lead
and are fully RoHS¹ compliant. The standard finish on the
leadframe is a matte tin plating over nickel, and the device
is capable of the 260°C reflow profiles as defined in J-
STD-020C². A gold or tin-lead finish is also available by
changing the part number designation.
The black compound has no discernable change in col-
oration when exposed to extended temperatures above
125°C. The marking on the package for the polarity stripe,
capacitance code, voltage rating, the KEMET logo, and the
print week code (PWC) are still created with a laser in a
dot matrix pattern. The effect does not create a coloration
change, but creates a surface abrasion as the laser removes
the reflectivity of the plastic surface in the desired pattern.
Figure 2. Depiction of “D” case, T499 SMT capacitors.
The unique marking (H+) is shown in Figure 2. An
explanation for the pattern with the markings is shown in
Figure 3.
Figure 1. Structure of new T499 tantalum capacitor.
Though similar to the earlier T498, the appearance of
this device is radically different from the previous SMT
tantalum capacitors from KEMET, in that the color is no
longer gold with brown lettering. The gold material has a
heat activation of color change from yellowish gold to
brown created in the presence of a controlled surface tem-
perature rise. A laser flash through a mask is used to cre-
ate the polarity and identifying marks on the gold plastic.
Using this material and process in the presence of higher
heats created an effect where the entire surface of the
package was turning brown, and the markings became in-
discernible.
Figure 3. Component marking diagram for T499 capacitor.
©2005 KEMET Electronics Corp.
May 2005