4

www.protekdevices.com

05095.R3 9/03

PSMS05

thru

PSMS24C

APPLICATION NOTE

CIRCUIT BOARD LAYOUT RECOMMENDATIONS

Circuit board layout is critical for Electromagnetic

Compatibility (EMC) protection. The following

guidelines are recommended:

input terminals or connectors, the device will

divert the transient current immediately before it

can be coupled into the nearby traces.

protected line should be minimized.

loops should be minimized.

should be kept as short as possible to reduce

parasitic inductance.

possible. For multilayer PCBs, use ground vias.

The PSMS Series are TVS arrays designed to protect I/O or data lines from the damaging effects of ESD or EFT. This product series provides both

unidirectional and bidirectional protection, with a surge capability of 350 Watts P

UNIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1)

The PSMS Series provides up to four (4) lines of protection in a common-mode configura-

tion as depicted in Figure 1.

Circuit connectivity is as follows:

✔

Line 1 is connected to Pin 1.

✔

Line 2 is connected to Pin 3.

✔

Line 3 is connected to Pin 4.

✔

Line 4 is connected to Pin 6.

✔

Pin 5 is connected to ground.

✔

Pin 2 is not connected.

BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 2)

The PSMSxxC Series provides up to four (4) lines of protection in a common-mode

configuration as depicted in Figure 2.

Circuit connectivity is as follows:

✔

Line 1 is connected to Pin 1.

✔

Line 2 is connected to Pin 3.

✔

Line 3 is connected to Pin 4.

✔

Line 4 is connected to Pin 5.

✔

Pin 6 is connected to ground.

✔

Pin 2 is not connected.

Figure 1 - Unidirectional Configuration

Common-Mode I/O Port Protection

3

1

5

6

2

4

LINE 1

LINE 2

LINE 3

LINE 4

Figure 2 - Bidirectional Configuration

Common-Mode I/O Port Protection

3

1

5

6

2

4

LINE 1

LINE 2

LINE 3

LINE 4