PESDXL4UF_G_W_4

© NXP B.V. 2008. All rights reserved.

Product data sheet

Rev. 04 — 28 February 2008

10 of 17

NXP Semiconductors

PESDxL4UF/G/W

Low capacitance unidirectional quadruple ESD protection diode arrays

7.

Application information

The devices are designed for the protection of up to four unidirectional data or signal lines

from the damage caused by ESD and surge pulses. The devices may be used on lines

where the signal polarities are both, positive and negative with respect to ground. The

devices provide a surge capability of 30 W per line for an 8/20

µs waveform each.

Circuit board layout and protection device placement

Circuit board layout is critical for the suppression of ESD, Electrical Fast Transient (EFT)

and surge transients. The following guidelines are recommended:

1. Place the device as close to the input terminal or connector as possible.

2. The path length between the device and the protected line should be minimized.

3. Keep parallel signal paths to a minimum.

4. Avoid running protected conductors in parallel with unprotected conductors.

5. Minimize all Printed-Circuit Board (PCB) conductive loops including power and

ground loops.

6. Minimize the length of the transient return path to ground.

7. Avoid using shared transient return paths to a common ground point.

8. Ground planes should be used whenever possible. For multilayer PCBs, use ground

vias.

Fig 9.

Application diagram

006aab126

data- or transmission lines

n.c.

unidirectional protection of 4 lines

DUT

1

2

3

5

4

bidirectional protection of 3 lines

DUT

1

2

3

5

4