PLCDA03

thru

PLCDA24

4

05076.R8 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 PLCDA 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

BIDIRECTIONAL COMMON-MODE CONFIGURATION (Figure 1)

Ideal for use in USB applications, the PLCDA Series provides up to two (2) lines of protection in a common-mode configuration as depicted in Figure 1.

Circuit connectivity is as follows:

✔

Pins 1 & 2 and 3 & 4 are connected to Ground

✔

Pins 5 and 6 are connected to I/O Line D+

✔

Pins 7 and 8 are connected to I/O Line D-

Figure 1. Typical Common-Mode USB Protection

Circuit

1

23

4

5

6

7

8

D+

D-

GND

USB

IC