TLF-35Advanced TLF - Improved PTH and PIMD Performance
Features and Benefits :
● Improved PIMD with DK3.5
● Improved PTH Quality
● Stable at high frequency
● Stable at high temp.
● Low moisture absorption
● Excellent Peel Strength
● Excellent price/performance
Ratio
Applications :
● Size effective Antenna
● Power Amplifiers
- High Gain
- TD-SCDMA
-WCDMA
- LTE
-WLAN
-BWA
● LNA, Repeater PA
● Passive Components
- Filters / Couplers
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www.taconic-add.com
TLF-35 is an organic-ceramic lami nate in Taconic’s
family of product. It is based on woven glass
reinforcement. TLF-35 is a result of Taconic’s expertise
in both ceramic fill technology and in coated PTFE
fiberglass.
TLF-35 advanced is the best choice for low cost, high
volume commercial micr owave and radio frequency
application. TLF-35 advanced has e xcellent peel
strength for ½ ounce and 1 ounce copper (even in
comparison to standard epoxy materials), a critical
aspect whenever rework is required.
TLF-35 advanced is designed to offer superior high
frequency performance. TLF-35’s ultra low moisture
absorption rate and low dissipation factor minimize
phase shift with frequency.
Advanced TLF-35 (TLF-35-xxxx-A) laminates show
similar electrical properties as TLF-35 but tighter DK
tolerance. TLF-35 advanced is designed to obtaining
improved PIMD performances on size effective boards
for antenna application. Most of sensitive PIMD
required base material’s Dielectric constant is around
3.0 whereas TLF-35advanced laminates dielectric
constant is 3.5 with similar PIMD levels.
TLF-35-advanced laminates show better PTH quality
which results in more stable hole wall and insulation
resistance even for the smaller drilled holes.
See “How to Order” on the back page for a complete
product listing.
A primary difference between PTFE-based composites and rubber based (hydrocarbon)
substrates is PTFE is oxidation resistant. PTFE starts to degrade near 600° C when the carbon-
fluorine bond starts to fail. PTFE is a thermoplastic and does not have unreactive chemistry
after processing. Rubbers, however, cure by a thermosetting mechanism and never cure to
completion, thus leaving some level of unreacted chemistry. Rubber substrates are not
temperature stable or oxidation resistant which causes these materials to turn yellow and then
black with air/heat. Automotive rubber is typically sulfur cured and contains a high level of
carbon black. These additives cannot be used in laminates due to their poor electrical properties.
Laminate suppliers cannot use the same strategies as the automotive industry to stabilize their
rubber. This leaves the rubber (hydrocarbon) products susceptible to temperature dri ven
oxidation (a time and temperature-based phenomenon). Oxidation, diffusion, stress relaxation
and any process that is temperature related generally follows an Arrhenius relationship where
the rate of oxidation doubles with every ten degree rise. Rubber oxidation is no exception; with
exposure to temperature and air, rubbers oxidize, embrittle and their elongation and peel
strength decrease while their dielectric constant and dissipation factor increase.
PTFE Composites vs. Rubber (Hydrocarbon) Composites:
PTFE-fiberglass products such as TLF-35
donot suffer from a change in their dielectric
constant or dissipation factor with temperature
exposure. Above figures show the change in
dielectric constant and dissipation factor of a
non-brominated rubber and a PTFE ceramic
fiberglass laminate with exposure to air at
150℃.
Copper peel strength will decline with
temperature due to the oxidation of the copper
in addition to any factors that would cause
embrittlement of resin system. This oxidation
(Yellowing) will occur at as low as 95℃ over
prolonged time periods.
Before Aging
Aging for 100Hr
Aging for 24Hr
TLF-35
HydroCarbon
Effect of thermal aging on color
Advanced TLF - Improved PTH and PIMD Performance
0 200 400 600 800 1000
0.001
0.002
0.003
0.004
0.005
0.006
TLF-35 DF
Hydro Carbon DF
Dissipation Factors(tan δ)
HOURS (@150C)
0 200 400 600 800 1000
3.40
3.45
3.50
3.55
3.60
3.65
3.70
TLF-35 DK
Hydro Carb o n
Dielectri c Constant(DK)
HOURS (@150C)