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ESD4238
ESD Strike
I/O
Connector
I SHUNT
ESD ESD
Protection
PROTECTION
Device
DEVICE
I RESIDUAL
ASIC
Figure 3 illustrates a standard ESD protection device. The
Figure 2. Standard ESD Protection Device Block Diagram
The Architecture Advantages Connector
L1
inductor element represents the parasitic inductance arising
50 W
L2
ASIC
from the bond wire and the PCB trace leading to the ESD
protection diodes.
Connector
ESD
Stage
ASIC
Bond Wire
Inductance
ESD
Device
Figure 4. ESD4238 ESD Protection Model
ESD4238 Inductor Elements
In the ESD4238 architecture, the inductor elements and
ESD protection diodes interact differently compared to the
standard ESD model. In the standard ESD protection device
model, the inductive element presents high impedance
against high slew rate strike voltage, i.e. during an ESD
strike. The impedance increases the resistance of the
conduction path leading to the ESD protection element. This
Figure 3. Standard ESD Protection Model
Figure 4 illustrates one of the channels. Similarly, the
inductor elements represent the parasitic inductance arising
from the bond wire and PCB traces leading to the ESD
protection diodes as well.
limits the speed that the ESD pulse can discharge through the
ESD protection element.
In the architecture, the inductive elements are in series to
the conduction path leading to the protected device. The
elements actually help to limit the current and voltage
striking the protected device.
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