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05205.R6 10/12

Page 6

USB0403 - USB0424C

aPPliCation inFoRMation

3

4

1

2

GND

SOLDER PAD

3

4

1

2

USB

IC

D+

D-

3

4

1

2

R

R

T

X

R

X

FigURe 1 - USB PRoteCtion

Two USB04xx (Unidirectional) in a Common-Mode configuration. Circuit connectivity is as follows:

• Device 1: Line 1(D+) is connected to pins 2 and 3.

• Device 2: Line 2(D-) is connected to pins 2 and 3.

• Device 1 and 2: Pins 1 and 4 connected to ground

FigURe 2 - etheRnet PRoteCtion

One USB04xxC (Bidirectional) in a Differential-Mode configuration. Circuit connectivity is as follow:

• Line 1 (R

• Line 2 (T

CiRCUit BoaRD ReCoMMenDationS

Circuit board layout is critical for electromagnetic compatibility protection. The following guidelines are recommended:

• The protection device should be placed near the input terminals or connectors, the device will divert the transient current

immediately before it can be coupled into the nearby traces.

• The path length between the TVS device and the protected line should be minimized.

• All conductive loops including power and ground loops should be minimized.

• The transient current return path to ground should be kept as short as possible to reduce parasitic inductance.

• Ground planes should be used whenever possible. For multilayer PCBs, use ground vias.