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05142.R14 10/10

Page 5

SLVU2.8-4

APPLICATION INFORMATION

FIGURE 1 - BIDIRECTIONAL COMMON-MODE PROTECTION

The SLVU2.8-4 provides 4 lines of protection in a common mode configuration. Circuit connectivity is as follows:

• Line 1 connected to Pin 1.

• Line 2 connected to Pin 7.

• Line 3 connected to Pin 3.

• Line 4 connected to Pin 5.

• Pins 2, 4, 7 and 7 are connected to ground.

• External diode to ground is a low capacitance diode of less than 10pF.

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.

1

2

4

8

3

5

6

7

Line Pair 1

Line Pair 2

Line Pair 1

Line Pair 2

FIGURE 2 - BIDIRECTIONAL DIFFERENTIAL-MODE PROTECTION

The SLVU2.8-4 provides two line pairs in a differential mode configuration. Circuit connectivity is as follows:

• Line Pair 1 connected to Pins 1, 2, 7 and 8.

• Line Pair 2 connected to Pins 3, 4, 5 and 6.

1

2

4

8

3

5

6

7

Line 1

Line 2

Line 3

Line 4