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PSRDA33-4 Datasheet(PDF) 4 Page - Protek Devices

Part No. PSRDA33-4
Description  STEERING DIODE / TVS ARRAY COMBO
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Maker  PROTEC [Protek Devices]
Homepage  http://www.protekdevices.com
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PSRDA33-4 Datasheet(HTML) 4 Page - Protek Devices

   
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www.protekdevices.com
05096.R7 4/05
PSRDA3.3-4
thru
PSRDA15-4
APPLICATION NOTE
The PSRDAxx-4 Series are low capacitance, unidirectional 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-4 Series provides up
to four (4) lines of protection in a differential-mode configuration as
depicted in Figure 1.
Circuit connectivity is as follows:
Pins 1, 4, 6 and 7 are connected to the data lines.
Pins 5 and 8 are connected to ground.
Pins 2 and 3 are connected to the databus.
DIFFERENTIAL-MODE CONFIGURATION (Figure 2)
The PSRDAxx-4 Series also provides up to four (4) lines of protection
in a differential-mode configuration as depicted in Figure 2 for T1/E1
applications.
Circuit connectivity is as follows:
Pins 1, 4, 6 and 7 are connected to the data lines.
Pins 5 and 8 are connected to ground.
Pins 2 and 3 are 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.
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.
Figure 2. Typical Differential-Mode T1/E1 Protection
4
1
2
8
7
6
5
3
PTC
PTC
PTC
PTC
PLC01-
6
PLC01-
6
GND
GND
TRING
TTIP
RTIP
RRING
4
1
2
8
7
6
5
3
Figure 1. Typical Differential-Mode USB Protection
USB PORT
V
BUS
GND
D+
D-
USB PORT
V
BUS
GND
D+
D-
V
BUS
GND
GND


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