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參數(shù)資料
| 型號(hào)： | TF202 |
| 廠商： | Semtech Corporation |
| 英文描述： | USB Upstream Port Filter & TVS For EMI Filtering and ESD Protection |
| 中文描述： | 上游的USB端口過(guò)濾 |
| 文件頁(yè)數(shù)： | 1/6頁(yè) |
| 文件大小： | 164K |
| 代理商： | TF202 |
2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
Objective - March 03, 2000
USB Upstream Port Filter & TVS
For EMI Filtering and ESD Protection
STF202-22
&
STF202-30
SCHEMATIC & PIN CONFIGURATION
FEATURES
Bidirectional EMI/RFI filtering and line termination
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
EIAJ SOT-23 6L package
Molding compound flammability rating: UL 94V-0
Marking : Marking Code
Packaging : Tape and Reel per EIA 481
APPLICATIONS
USB Hubs
Portable electronics
Cellular Handsets
Peripherals
Servers, Desktop, Notebook, and Handheld
Computers
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
or
30
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
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.
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.Semtech.com
Part Number
Series
Resistor
Qty per
Reel
Reel Size
STF202-22.TC
22
3,000
7”
STF202-30.TC
30
3,000
7”
ORDERING INFORMATION
SOT-23 6L (Top View)
COMPONENT VALUES
Series
Resistor
(R
S)
Pull Up
Resistor
(R
PU)
Termination
Capacitor
(C)
STF202-22
22
1.5k
47
STF202-30
30
1.5k
47
Tolerance
±10%
±20%
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