VBUS54FD-SD1

www.vishay.com

Vishay Semiconductors

Rev. 1.1, 20-Sep-16

2

Document Number: 82665

THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT

APPLICATION NOTE

The VBUS54FD-SD1 is a four-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 USB 2.0, USB 3.0 or HDMI.



With the VBUS54FD-SD1 four high speed data lines can be protected against transient voltage signals like ESD (Electro Static

Discharge). Connected to the data line (pin 1, 3 and pin 4, 5) and to ground (pin 2) negative transients will be clamped close

below the ground level while positive transients will be clamped close above the 5.5 V working range. The clamping behavior

of the VBUS54FD-SD1 is bidirectional but asymmetrical (BiAs) and so it offers the best protection for applications running up

to 5.5 V.

Pin configuration:

• Pin 2 is the central ground pin and has to be connected to ground

FLOW THROUGH DESIGN

Modern digital transmission lines can be clocked up to 480 Mbit/s (USB 2.0) 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

) 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

VBUS54FD-SD1 is placed on top without any vias or loops.

ELECTRICAL CHARACTERISTICS (pin 1, 3, 4 or 5 to pin 2)



PARAMETER

TEST CONDITIONS/REMARKS

SYMBOL

MIN.

TYP.

MAX.

UNIT

Protection paths

Number of lines which can be protected

--

4

lines

Reverse stand-off voltage

Max. reverse working voltage

--

5.5

V

Reverse voltage

5.5

-

-

V

Reverse current

-

< 1 nA

0.1

μA

Reverse breakdown voltage

6.9

7.5

8.7

V

Reverse clamping voltage

-9.5

11

V

-

12.9

15

V

Forward clamping voltage

-1.8

2.2

V

-3

4

V

Capacitance

-0.9

1

pF

-

0.9

1

pF

Clamping voltage

-18-

V

Clamping voltage

-24-

V

Dynamic resistance

-0.93-



22736

13

2

5

4

Receiver

Transmitter

1

2

3

5

4

22737