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05135.R10 9/10

Page 6

SLVU2.8

APPLICATION INFORmATION

FIGURE 1 - UNIDIRECTIONAL COmmON mODE PROTECTION

Circuit connectivity is as follows:

• Line 1 connected to Pin 3.

• Pins 1 and 2 connected to ground.

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.

FIGURE 2 - BIDIRECTIONAL COmmON mODE PROTECTION

Two SLUV2.8 devices used in parallel. Circuit connectivity is as follows:

• Line 1 connected to Pin 1 of Device 1 and Pin 2 connected to Device 2.

• Pin 2 of Device 1 and Pin 1 of Device 2 connected to ground.

• Pin 3 of both Devices not connected.

2

3

1

I/O LINE

GND

2

3

1

2

3

1

I/O LINE

GND

GND

D1

D2

2

3

1

2

3

1

I/O LINE 1

D1

D2

I/O LINE 2

FIGURE 3 - BIDIRECTIONAL DIFFERENTIAL mODE PROTECTION

Two SLUV2.8 devices used in parallel. Circuit connectivity is as follows:

• Line 1 connected to Pin 1 of Device 1 and Pin 2 connected to Device 2.

• Line 2 connected to Pin 2 of Device 1 and Pin 1 of Device 2.

• Pin 3 not connected.