LT1739CFE#TR Linear Technology, LT1739CFE#TR Datasheet - Page 11
![IC AMP XDSL LINE DRV DUAL20TSSOP](/photos/6/63/66309/161-20-tssop_sml.jpg)
LT1739CFE#TR
Manufacturer Part Number
LT1739CFE#TR
Description
IC AMP XDSL LINE DRV DUAL20TSSOP
Manufacturer
Linear Technology
Type
Line Driver, Transmitterr
Datasheet
1.LT1739IUE.pdf
(20 pages)
Specifications of LT1739CFE#TR
Number Of Drivers/receivers
2/0
Protocol
DSL
Voltage - Supply
5 V ~ 12 V
Mounting Type
Surface Mount
Package / Case
20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
LT1739CFETR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
APPLICATIO S I FOR ATIO
When PCB cards containing multiple ports are inserted
into a rack in an enclosed cabinet, it is often necessary to
provide airflow through the cabinet and over the cards. As
Figure 8. Examples of PCB Metal Used for Heat Dissipation. Driver Package Mounted on Top Layer.
Heat Sink Pad Soldered to Top Layer Metal. Metal Areas Drawn to Scale of Package Size
U
STILL AIR
100 C/W
130 C/W
50 C/W
45 C/W
75 C/W
TSSOP
TSSOP
TSSOP
DFN
DFN
U
JA
PACKAGE
W
–20
–30
–40
–50
–60
–10
0
0
Laminar Airflow Over the Device
AIRFLOW (LINEAR FEET PER MINUTE, lfpm)
TOP LAYER
Typical Reduction in
100
U
200
300
400
% REDUCTION RELATIVE
TO
500
2ND LAYER
JA
600
seen in the graph of Figure 8, this is also very effective in
further reducing the junction-to-ambient thermal resis-
tance of each line driver.
IN STILL AIR
700
JA
800
with
900
1739 F08b
1000
3RD LAYER
BOTTOM LAYER
1739 F08a
LT1739
1739fas, sn1739
11