4

www.protekdevices.com

05143.R6 4/05

SLVDA2.8LC

APPLICATION NOTE

CIRCUIT BOARD LAYOUT RECOMMENDATIONS

Circuit board layout is critical for Electromagnetic

Compatibility (EMC) 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 1: Bidirectional Common-Mode Protection

Figure 2: Bidirectional Differential-Mode Protection

Electronic equipment is susceptible to damage caused by Electrostatic Discharge (ESD), Electrical Fast Transients (EFT), and tertiary lightning effects.

Knowing that equipment can be damaged, the SLVDA2.8LC was designed to provide the level of protection required to safe guard sensitive high

speed data circuits. This product can be used to provide a level of protection to meet bidirectional requirements either in a common-mode or

differential-mode configuration.

BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1)

The SLVDA2.8LC can provide up to four (4) lines of protection in a common-mode configuration as depicted in Figure 1.

Circuit connectivity is as follows:

✔

Line 1 is connected to pin 8

✔

Line 2 is connected to pin 7

✔

Line 3 is connected to pin 6

✔

Line 4 is connected to pin 5

✔

Pins 1, 2, 3, and 4 are connected to ground

BIDIRECTIONAL DIFFERENTIAL-MODE CONFIGURATION (Figure 2)

The SLVDA2.8LC can provide up to four line pairs (4) of protection in a differential-mode configuration as depicted in Figure 2.

Circuit connectivity is as follows:

✔

Line Pair # 1 is connected to pin 8 and 1

✔

Line Pair # 2 is connected to pin 7 and 2

✔

Line Pair # 3 is connected to pin 5 and 4

✔

Line Pair # 4 is connected to pin 6 and 3