PLCDA03

thru

PLCDA24

4

05102.R7 2/07

www.protekdevices.com

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.

The PLCDAxxC-6 Series are low capacitance, bidirectional TVS arrays that are designed to protect I/O or high speed data lines from the damaging

effects of ESD or EFT. This product series has a surge capability of 500 Watts P

40kv.

BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1)

Ideal for use multimode transceiver I/O lines, the PLCDAxxC-6 Series provides up to six (6) lines of protection in a common-mode configuration as

depicted in Figure 1.

Circuit connectivity is as follows:

✔

Line 1 is connected to Pin 1.

✔

Line 2 is connected to Pin 2.

✔

Line 3 is connected to Pin 3.

✔

Line 4 is connected to Pin 8.

✔

Line 5 is connected to Pin 7.

✔

Line 6 is connected to Pin 6.

✔

Pins 4 and 5 are connected to Ground.

BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 2)

The PLCDAxxC-6 Series also provides video line applications six (6) lines of protection in a common-mode configuration as depicted in Figure 2.

Circuit connectivity is as follows:

✔

Line 1 (Red) is connected to Pin 1.

✔

Line 2 (Green) is connected to Pin 2.

✔

Line 3 (Blue) is connected to Pin 3.

✔

Line 4 (VSYNC) is connected to Pin 6.

✔

Line 5 (HSYNC) is connected to Pin 7.

✔

Pins 4 and 5 are connected to Ground.

1

2

3

4

8

7

6

5

LINE 6

LINE 1

LINE 2

LINE 3

LINE 4

LINE 5

Figure 1: Typical Transceiver Protection Circuit

Figure 2: Typical Video Line Protection Circuit

1

2

3

4

8

7

6

5

LINE 1 (RED)

LINE 2 (GREEN)

LINE 3 (BLUE)

LINE 4 (VSYNC)

LINE 4 (HSYNC)

DB-15

CONNECTOR