Datenblatt-Suchmaschine für elektronische Bauteile |
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STF201-22.TC Datenblatt(PDF) 1 Page - Semtech Corporation |
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STF201-22.TC Datenblatt(HTML) 1 Page - Semtech Corporation |
1 / 7 page PROTECTION PRODUCTS 1 www.semtech.com PROTECTION PRODUCTS STF201-22 & STF201-30 USB Downstream Port Filter & TVS For EMI Filtering and ESD Protection Description Features Pin Configuration Revision 08/11/04 The STF201 is a combination EMI filter and line termi- nation device with integrated TVS diodes for use on downstream 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 downstream USB port. The STF201 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 Ω or 30 Ω 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 15k Ω pull-down resistors complete the termination circuit on each line. They are required by the USB specification to identify the line as a downstream connection. The 47pF capacitors are used to bypass high frequency energy to ground and for edge rate control of the USB signals. Finally, the STF201 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 61000- 4-2, level 4. The small size and integrated feature of the STF201 minimizes required board space and increases system reliability. The pin-out of the device allows easy imple- mentation. The STF201 is suitable for use in USB hubs, computers, peripherals, and portable devices. Applications Mechanical Characteristics USB Hubs Portable electronics Printers Monitors Servers, Desktop, and Notebook computers 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 61000-4-2 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 Low capacitance Solid-state technology EIAJ SOT23-6L package Molding compound flammability rating: UL 94V-0 Marking : Marking Code Packaging : Tape and Reel per EIA 481 S0T23-6L (Top View) Circuit Diagram |
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