stf202

Manufacturer Part Numberstf202
DescriptionStf202 Usb Upstream Port Filter And Tvs For Emi Filtering And Esd Protection
ManufacturerSemtech Corporation
stf202 datasheet
 


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PROTECTION PRODUCTS
Description
The STF202 is a combination EMI filter and line termi-
nation device with integrated TVS diodes for use on
upstream USB ports. It is constructed using a propri-
etary 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 require-
ments of revision 1.1 of the Universal Serial Bus
specification.
USB line termination is achieved with series 22
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 specifi-
cation 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 con-
tains TVS diodes for ESD protection of both
(D+ and D-) data lines and the voltage bus (V
TVS diodes provide effective suppression of ESD
voltages in excess of ±15kV (air discharge) and ±8kV
(contact discharge) per IEC 61000-4-2, 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.
Circuit Diagram
.
Revision 08/11/04
STF202-22 and STF202-30
USB Upstream Port Filter and TVS
For EMI Filtering and ESD Protection
Features
Bidirectional EMI/RFI filtering and line termination
with integrated ESD protection
ESD protection for USB power (V
(D+ and D-) to
IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
Filtering and termination for two USB data lines
Different series resistors for impedance matching
Low TVS operating voltage (5.25V)
Low leakage current
or
Low capacitance
Solid-state technology
Mechanical Characteristics
EIAJ SOT23 6L package
Molding compound flammability rating: UL 94V-0
Marking : Marking Code
Packaging : Tape and Reel per EIA 481
Applications
USB Hubs
). The
Portable electronics
BUS
Cellular Handsets
Modems
Peripherals
Servers, Desktop, Notebook, and Handheld
Computers
Schematic and PIN Configuration
S0T23-6L (Top View)
1
) and data lines
BUS
www.semtech.com

stf202 Summary of contents

  • Page 1

    ... PROTECTION PRODUCTS Description The STF202 is a combination EMI filter and line termi- nation device with integrated TVS diodes for use on upstream USB ports constructed using a propri- etary technology that allows passive components and TVS diodes to be integrated in the same package. ...

  • Page 2

    ... 2004 Semtech Corp. STF202-22 and STF202- ...

  • Page 3

    ... PROTECTION PRODUCTS PROTECTION PRODUCTS Typical Characteristics ESD Clamping (8kV Contact) Typical Insertion Loss 0 dB -10 dB -20 dB 0.030MHz 2004 Semtech Corp. STF202-22 and STF202-30 ESD Clamping (15kV Air) Analog Crosstalk ( -20 dB -60 dB 2.0GHz 0.030 MHz 3 1 GHz www.semtech.com ...

  • Page 4

    ... PROTECTION PRODUCTS PROTECTION PRODUCTS Applications Information Device Connection The STF202 is designed to provide termination, EMI filtering and ESD protection for two USB I/O lines. The equivalent circuit diagram is shown in Figure 1. The device is connected as follows Full-Speed Devices: For full-speed devices the pull ...

  • Page 5

    ... PROTECTION PRODUCTS PROTECTION PRODUCTS Applications Information 2004 Semtech Corp. STF202-22 and STF202-30 Figure 3 - USB Port Components Figure 4 - Typical USB Hub Design 5 www.semtech.com ...

  • Page 6

    ... DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. Land Pattern -SOT23 6L X (C) P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2004 Semtech Corp. STF202-22 and STF202- GAGE PLANE 0.25 L (L1) A DETAIL ...

  • Page 7

    ... Contact Information Phone: (805)498-2111 FAX (805)498-3804 2004 Semtech Corp. STF202-22 and STF202- ...