downstream USB ports. It is constructed using a
and TVS diodes to be integrated in the same package.
for one downstream USB port. The STF201
specification.
30鈩?resistors on both the D+ and D- USB lines. These
impedance to that of the differential driver. The 15k鈩?/div>
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.
STF201-22 & STF201-30
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 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
Mechanical Characteristics
!
!
!
!
EIAJ SOT23-6L package
Molding compound flammability rating: UL 94V-0
Marking : Marking Code
Packaging : Tape and Reel per EIA 481
Applications
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!
!
!
!
USB Hubs
Portable electronics
Printers
Monitors
Servers, Desktop, and Notebook computers
Circuit Diagram
Schematic & Pin Configuration
S0T23-6L (Top View)
Revision 4/19/01
1
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