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© 2012 Semtech Corporation.
www.semtech.com
uClamp3603T
PROTECTION PRODUCTS
Applications Information
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Three Wire Proximity SwitchesThree Wire Proximity Switches
Three Wire Proximity SwitchesThree Wire Proximity Switches
Three Wire Proximity Switches
Digital sensors help to bridge the gap between the
physical world and the digital world in applications such
as computer controlled factory automation, automo-
tive spark timing and throttle position sensing amongst
others. In such environments, transient voltages can
easily disrupt or damage sensitive sensor inputs. The
uClamp3603T provides transient voltage protection
for the digital sensors to ensure their operation is not
disrupted by the physical world.
The uClamp3603T is designed to meet the high surge
capability and low clamping voltage needed to protect
the ASIC and control logic used in proximity switches.
The uClamp3603T provides protection for the power
and I/O lines. Typical configurations for the protection
of two and three wire switches are illustrated:
Circuit Board Layout Recommendations forCircuit Board Layout Recommendations for
Circuit Board Layout Recommendations forCircuit Board Layout Recommendations for
Circuit Board Layout Recommendations for
Suppression of ESD.Suppression of ESD.
Suppression of ESD.Suppression of ESD.
Suppression of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines
are recommended:
Place the TVS near the input terminals or connec-
tors to restrict transient coupling.
Minimize the path length between the TVS and the
protected line.
Minimize all conductive loops including power and
ground loops.
The ESD transient return path to ground should be
kept as short as possible.
Never run critical signals near board edges.
Use ground planes whenever possible.
Equivalent Circuit Diagram
2-Wire DC Proximity Switch Application
SENSOR
(ASIC)
+V
GN
uClamp3603T
3-Wire DC Proximity Switch Application
SENSOR
(ASIC)
+V
GN
I/O
uClamp3603T
