RCLAMP0554S.TCT Semtech, RCLAMP0554S.TCT Datasheet - Page 6

• Manufacturer Part Number: RCLAMP0554S.TCT
• Description: TVS DIODE 5V 375W SOT23-6L
• Manufacturer: Semtech
• Series: RailClamp®r

Specifications of RCLAMP0554S.TCT

• Voltage - Reverse Standoff (typ): 5V
• Voltage - Breakdown: 6V
• Power (watts): 375W
• Polarization: 4 Channel Array - Bidirectional
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: RCLAMP0554STR

the reference voltage plus the V
For negative events, the bottom diode will be biased
when the voltage exceeds the V
approximation, the clamping voltage due to the charac-
teristics of the protection diodes is given by:
PIN Descriptions
V
V
However, for fast rise time transient events, the
effects of parasitic inductance must also be consid-
ered as shown in Figure 2. Therefore, the actual
clamping voltage seen by the protected circuit will be:
V
V
ESD current reaches a peak amplitude of 30A in 1ns
for a level 4 ESD contact discharge per IEC 61000-4-2.
Therefore, the voltage overshoot due to 1nH of series
inductance is:
V = L
Example:
Consider a V
steering diode and a series trace inductance of 10nH.
The clamping voltage seen by the protected IC for a
positive 8kV (30A) ESD pulse will be:
V
This does not take into account that the ESD current is
directed into the supply rail, potentially damaging any
components that are attached to that rail. Also note
that it is not uncommon for the V
exceed the damage threshold of the protected IC. This
is due to the relatively small junction area of typical
discrete components. It is also possible that the
power dissipation capability of the discrete diode will
be exceeded, thus destroying the device.
The RailClamp is designed to overcome the inherent
disadvantages of using discrete signal diodes for ESD
suppression. The RailClamp’s integrated TVS diode
PROTECTION PRODUCTS
© 2011 Semtech Corp.
Applications Information (continued)
C
C
C
C
C
= V
= -V
= V
= -V
= 5V + 30V + (10nH X 30V/nH) = 335V
P
CC
CC
F
di
F
- L
+ V
+ V
ESD
G
/dt = 1X10
F
F
di
CC
+ L
ESD
= 5V, a typical V
(for positive duration pulses)
(for negative duration pulses)
P
/dt
di
ESD
/dt (for positive duration pulses)
-9
(30 / 1X10
(for negative duration pulses)
F
F
F
of 30V (at 30A) for the
of the diode. At first
F
drop of the diode.
of discrete diodes to
-9
) = 30V
6
When Using Discrete Components to Implement
When Using Discrete Components to Implement
When Using Discrete Components to Implement
When Using Discrete Components to Implement
When Using Discrete Components to Implement
Figure 2 - The Effects of Parasitic Inductance
Figure 2 - The Effects of Parasitic Inductance
Figure 2 - The Effects of Parasitic Inductance
Figure 2 - The Effects of Parasitic Inductance
Figure 2 - The Effects of Parasitic Inductance
Figure 1 - “Rail-
Figure 1 - “Rail-
Figure 1 - “Rail-
Figure 1 - “Rail-
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Figure 3 - Rail-
Figure 3 - Rail-
Figure 3 - Rail-T T T T T o-Rail Pr
Figure 3 - Rail-
Figure 3 - Rail-
Rail-
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Rail-
Rail-
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RailClam
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