USB0403
thru
USB0424C
APPLICATIONS
The USB04 Series are TVS arrays designed to protect I/O or
data lines from the damaging effects of ESD and EFT. This
product series provides both unidirectional and bidirectional
protection, with a surge capability of 500 Watts PPP per line for
an 8/20µs waveform and ESD protection > 40kV.
Figure 1 - Unidirectional Configuration (Two TVS Devices)
Common-Mode USB Protection
1
2
4
1
4
3
GND
SOLDER PAD
UNIDIRECTIONAL
COMMON-MODE CONFIGURATION (Figure 1)
3
2
The two USB04 Series devices provide protection in a common-
mode configuration as depicted in Figure 1.
Circuit connectivity is as follows:
USB IC
✔
✔
TVS Device 1: Line 1(D+) is connected to Pins 2 & 3.
TVS Device 2: Line 2(D-) is connected to Pins 2 & 3.
D+
D-
✔
Both TVS Devices: Pins 1 & 4 connected to ground.
BIDIRECTIONAL
DIFFERENTIAL-MODE CONFIGURATION (Figure 2)
Figure 2 - Bidirectional Configuration
Differential-Mode Ethernet Protection
The USB04xxC Series provides protection in a differential-mode
configuration as depicted in Figure 2.
RX
Circuit connectivity is as follows:
✔
Line 1(RX) is connected to Pins 1 & 4.
Line 2(TX) is connected to Pins 2 & 3.
1
2
4
3
R
✔
R
T
X
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.
05205.R1 6/06
4
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