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Product data sheet

Rev. 01 — 11 May 2005

7 of 13

Philips Semiconductors

PESDxU1UT series

Ultra low capacitance ESD protection diode in SOT23 package

7.

Application information

The PESDxU1UT series is designed for protection of high-speed datalines from damage

caused by ESD and surge pulses. PESDxU1UT devices combine an ESD protection

diode and an ultra low capacitance compensation diode to ensure an effective device

capacitance as low as 0.6 pF. The PESDxU1UT series provides a surge capability of up to

200 W per line for an 8/20

µs waveform.

Two PESDxU1UT devices in anti-parallel configuration provide ESD protection in a

common-mode application.

The two PESDxU1UT devices should be connected as follows:

protected data line is connected to

device 1 / pin 2

device 2 / pin 1

Ground is connected to

device 1 / pin 1

device 2 / pin 2

pin 3 is not connected for both devices

Fig 5.

Bi-directional ESD protection of one line, common mode

Two PESDxU1UT devices in anti-parallel configuration provide ESD protection in a

differential-mode configuration as e.g. for Ethernet applications.

The two PESDxU1UT should be connected as follows:

I/O line 1 is connected to

device 1 / pin 2

device 2 / pin 1

I/O line 2 is connected to

device 1 / pin 1

device 2 / pin 2

pin 3 is not connected for both devices

Fig 6.

Differential mode Ethernet protection

006aaa443

3

n.c.

n.c.

3

1

protected data line

ground

PESDxU1UT

PESDxU1UT

2

1

2

ETHERNET

TRANSCEIVER

006aaa444

3

n.c.

n.c.

I/O 1

I/O 2

3

1

PESDxU1UT

PESDxU1UT

2

1

2