STF202-22
USB Upstream Port Filter & TVS
For EMI Filtering and ESD Protection
Objective - March 03, 2000
&
STF202-30
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.Semtech.com
DESCRIPTION
The STF202 is a combination EMI filter and line
termination device with integrated TVS diodes for use
on upstream USB ports. It is constructed using a
proprietary technology that allows passive components
and TVS diodes to be integrated in the same package.
Each device will provide
termination, filtering,
and
ESD protection
for one upstream USB port. The
STF202 is an easily implemented solution for meeting
the requirements of revision 1.1 of the Universal Serial
Bus specification.
USB line termination is achieved with series 22鈩?or
30鈩?resistors on both the D+ and D- USB lines. These
resistors preserve signal integrity by matching the
cable impedance to that of the differential driver. The
1.5k鈩?pull-up resistor completes the termination circuit
on each line. This resistor is required by the USB
specification to identify the equipment as either a full-
speed (connected to D+ line) or low-speed (connected
to D- line) device. The 47pF capacitors are used to
bypass high frequency energy to ground and for edge
rate control of the USB signals. Finally, the STF202
contains TVS diodes for ESD protection of both (D+ &
D-) data lines and the voltage bus (V
BUS
). The TVS
diodes provide effective suppression of ESD voltages
in excess of 15kV (air discharge) and 8kV (contact
discharge) per IEC 1000-4-2, level 4.
The small size and integrated feature of the STF202
minimizes required board space and increases system
reliability. The STF202 is suitable for use in USB hubs,
computers, peripherals, and portable devices.
FEATURES
鈥?/div>
Bidirectional EMI/RFI filtering and line termination
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
with integrated ESD protection
ESD protection for USB power (V
BUS
) and data
lines (D+ & D-) to
IEC 1000-4-2 Level 4
Filtering and termination for two USB data lines
Different series resistors for impedance matching
Low TVS operating voltage (5.25V)
Low leakage current
Small SOT-23 6L package
Solid-state technology
MECHANICAL CHARACTERISTICS
鈥?/div>
EIAJ SOT-23 6L package
鈥?/div>
Molding compound flammability rating: UL 94V-0
鈥?/div>
Marking : Marking Code
鈥?/div>
Packaging : Tape and Reel per EIA 481
APPLICATIONS
鈥?/div>
USB Hubs
鈥?/div>
Portable electronics
鈥?/div>
Cellular Handsets
鈥?/div>
Peripherals
鈥?/div>
Servers, Desktop, Notebook, and Handheld
Computers
ORDERING INFORMATION
Part Number
STF202-22.TC
STF202-30.TC
Series
Resistor
22
鈩?/div>
30
鈩?/div>
Qty per
Reel
3,000
3,000
Reel Size
7鈥?/div>
7鈥?/div>
COMPONENT VALUES
Series
Resistor
(R
S
)
STF202-22
STF202-30
Tolerance
22
鈩?/div>
30
鈩?/div>
鹵10%
Pull Up
Resistor
(R
PU
)
1.5k
鈩?/div>
1.5k
鈩?/div>
鹵10%
Termination
Capacitor
(C)
47
47
鹵20%
SCHEMATIC & PIN CONFIGURATION
SOT-23 6L (Top View)
漏 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
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