PSRDA3.3-6 Datasheet, PDF (4/5 Pages) List of Unclassifed Manufacturers – STEERING DIODE / TVS ARRAY COMBO

APPLICATION NOTE
PSRDA3.3-6
thru
PSRDA05-6
The PSRDAxx-6 Series are low capacitance, bidirectional TVS arrays that are designed to protect I/O or high speed data lines from the damaging
effects of ESD or EFT. This product series has a surge capability of 500 Watts P_PP per line for an 8/20µs waveshape and offers ESD protection >
40kV.
DIFFERENTIAL-MODE CONFIGURATION (Figure 1)
Ideal for use in USB applications, the PSRDAxx-6 Series provides up to six (6) lines of protection in a differential mode configuration as depicted in
Figure 1.
Circuit connectivity is as follows:
✔ Pins 1, 2, 4, 5, 6 and 7 are connected to the datalines.
✔ Pin 8 is connected to ground.
✔ Pin 3 is connected to the databus.
CIRCUIT BOARD LAYOUT RECOMMENDATIONS
Circuit board layout is critical for Electromagnetic Compat-
ibility (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.
Figure 1. Typical Differential-Mode USB Protection
USB PORT _VBUS
D+
D-
GND
GND
8
7
6
5
USB PORT _VBUS
D+
D-
GND
✔ 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 induc-
tance.
✔ Ground planes should be used whenever possible.
For multilayer PCBs, use ground vias.
1
2 _VBUS 3
4
USB PORT V_BUS
D+
D-
GND
05110.R3 8/03
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