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05138.R11 10/12

Page 4

SMF05C - SMF24C

APPLICATIoN INFoRMATIoN

FIGURE 1 - CoMMoN-MoDE I/o PoRT PRoTECTIoN (UNIDIRECTIoNAL)

Circuit connectivity is as follows:

• Line 1 connected to pin 1.

• Line 2 connected to pin 3.

• Line 3 connected to pin 4.

• Line 4 connected to pin 6.

• Pin 2 connected to ground.

• Pin 5 not connected.

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 - CoMMoN-MoDE I/o PoRT PRoTECTIoN (BIDIRECTIoNAL)

Circuit connectivity is as follows:

• Line 1 connected to pin 1.

• Line 2 connected to pin 3.

• Line 3 connected to pin 4.

• Line 4 connected to pin 5.

• Line 5 connected to pin 6.

• Pin 2 not connected.

1

6

5

2

3

4

Line 1

Line 2

Line 3

Line 4

1

6

5

2

3

4

Line 1

Line 2

Line 3

Line 4

Line 5