USBDF01W5 STMicroelectronics, USBDF01W5 Datasheet - Page 6

• Manufacturer Part Number: USBDF01W5
• Description: IC EMI FLTR/LINE TERM SOT323-5
• Manufacturer: STMicroelectronics
• Series: USBDFxxW5r

Specifications of USBDF01W5

• Filter Type: Signal Line
• Mounting Type: Surface Mount
• Termination Style: Surface Mount (SMD,SMT)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Inductance: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-3086-2; 497-3086-5; 497-3086-5

Application information
2.3
2.4
6/11
Figure 7.
Note that the USBDFxxW5 is not only acting for positive ESD surges but also for negative
ones. Negative disturbances are clamped close to ground voltage as shown in
Latch-up phenomena
The early ageing and destruction of IC’s is often due to latch-up phenomena which is mainly
induced by dV/dt. Thanks to its structure, the USBDFxxW5 provides a high immunity to
latch-up phenomena by smoothing very fast edges.
Crosstalk behaviour
Figure 8.
The crosstalk phenomena is due to the coupling between 2 lines. The coupling factor ( 12
or 21 ) increases when the gap across lines decreases, this is the reason why we provide
crosstalk measurements for a monolithic device to guarantee negligeable crosstalk between
the lines. In the example above, the expected signal on load R
voltage at this point has got an extra value 21V
the effect of the crosstalk phenomenon of the line 1 on the line 2. This phenomenon has to
be taken into account when the drivers impose fast digital data or high frequency analog
signals in the disturbing line. The perturbed line will be more affected if it works with low
voltage signal or high load impedance (few k ).
V
G1
V
Remaining voltage at both stages S1 (V
surge
Crosstalk phenomena
G2
DRIVERS
R
G1
A. Positive surge
R
G2
Line 1
Line 2
G1
. This part of the V
RECEIVERS
R
input
L2
) and S2 (V
R
B. Negative surge
L1
L2
is
2
V +
2
G1
G2
V
G2
output
signal represents
1
V +
, in fact the real
2 1
G1
V
) during ESD
G1
USBDFxxW5
Figure
1 2
V
G2
7.b.