VBUS052CD-FAH

Vishay Semiconductors

2-Line BUS-Port ESD-Protection -

Flow Through Design

www.vishay.com

Document Number: 81881

2

Rev. 1.2, 19-May-10

Note

• Ratings at 25 °C, ambient temperature unless otherwise specified

APPLICATION NOTE

The VBUS052CD-FAH is a two-line ESD-protection device with the characteristic of a Z-diode with a high ESD immunity and

a very low capacitance which makes it usable for high frequency applications like USB2.0 or HDMI.

With the VBUS052CD-FAH two high speed data lines can be protected against transient voltage signals like ESD (Electro Static

Discharge). Connected to the data line (pin 1 and pin 2) and to ground (pin 3) negative transients will be clamped close below

the ground level while positive transients will be clamped close above the 5 V working range. The clamping behaviour of the

VBUS052CD-FAH is bidirectional but asymmetrical (BiAs) and so it offers the best protection for applications running up to 5 V.

Pin configuration:

• Pin 3, 4 and 7 are internally shorted and have to be connected to ground

• Pin 5 and 6 are not connected internally

FLOW THROUGH DESIGN

Modern digital transmission lines can be clocked up to 480 Mbit/s (USB2.0) or 1.65 Gbit/s (HDMI).

At such high data rates the transmission lines like cables or the line traces on the PCBs have to be very homogeneous regarding

their surge impedance. This requires well defined trace dimensions as trace width and distance which have to be calculated

depending on the requested surge impedance (e.g. 50

Ω) and the PCB material and layer dimensions. Any device connected

to the data lines - like ESD-protection devices - have to be connected with minimal changes in these trace dimensions and

distances.

With the package in the so called “Flow Through Design” this is possible. The lines are running straight along the PCB while the

VBUS052CD-FAH is placed on top without any vias or loops.

ELECTRICAL CHARACTERISTICS VBUS052CD-FAH (pin 1 or 2 to pin 3)

PARAMETER

TEST CONDITIONS/REMARKS

SYMBOL

MIN.

TYP.

MAX.

UNIT

Protection paths

Number of line which can be protected

--

2

lines

Reverse working voltage

5-

-

V

Reverse current

-

< 0.01

0.1

μA

Reverse breakdown voltage

6.9

7.9

8.7

V

Clamping voltage

-10

12

V

-15

18

V

Forward clamping voltage

-1.9

2.4

V

-4

5

V

Line capacitance

-0.8

1

pF

21325

7

654

123

GND

NC

NC

GND

D +

D -

21327

123

6

5

4

7

GND

D +

D -

I/O port connector

USB/HDMI interface

D +

D -