SR12-LF-T13 PROTEC [Protek Devices], SR12-LF-T13 Datasheet - Page 4

• Manufacturer Part Number: SR12-LF-T13
• Description: STEERING DIODE/ TVS ARRAY COMBO
• Manufacturer: PROTEC [Protek Devices]

CIRCUIT BOARD LAYOUT RECOMMENDATIONS
Circuit board layout is critical for Electromagnetic
Compatibility (EMC) protection. The following
guidelines are recommended:
✔
✔
✔
✔
✔
APPLICATION NOTE
The SR12 is a low capacitance, unidirectional TVS array that is 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
COMMON-MODE CONFIGURATION (Figure 1)
Ideal for use in USB applications, two SR12 devices provides up to two(2) lines of protection(per device) in a common-mode configuration as
depicted in Figure 1.
Circuit connectivity is as follows:
✔
✔
✔
05255.R0 9/06
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.
Pins 2 and 3 are connected to the datalines.
Pin 1 is connected to ground.
Pin 4 is connected to the databus.
PP
per line for an 8/20µs waveform and offers ESD protection > 25kV.
4
Figure 1. Typical Common-Mode USB Protection
1
2
1
2
3
4
4
3
VBus
VBus
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SR12
D+
D-
D+
D-
USB
PORT
USB
PORT
VBus
VBus