Applications
bias required. See Figures 1(a) & 1(b).
Both of these uses will provide ESD
protection at the limiting value. For
adjustable limiting and detection,
the bias should be applied as shown
in Figure 1(c). Adjustable limiting is
achieved by setting the A pin to a DC
voltage ~0.7 volts higher than the
Assembly techniques
The TC231 can be used as a protection
circuit for ESD and DC transients, as a
Reverse Power Protection (RPP) device,
or as an RF limiter with optional power
detection.
The 1GC1-4235 is designed for surgace
mount on a printed surface board using
standard SMTtechniques and wave
solder.
Well-designed PCB transitions and via
structures are essential for obtaining
The different modes of use require
different attachments. These are
described under Operation.
desired minimum voltage, and the C pin good performance from this and
to a DC voltage ~0.7 volt lower than the other high-frequency parts. Diodes
desired maximum voltage.
are ESD sensitive. ESD preventive
measures must be employed in all
aspects of handling and assembly.
Diode ESD precautions, handling
considerations, and soldering methods
are critcial factores in successful diode
performance and reliability.
If the voltage is not forced, the
capacitor will function as a peak
detector.
As an ESD protection device, the
TC231 can protect ESD sensitive
components. The degree of protection
depends on the protected components
characteristics. ESD damage level for
the TC231 by itself is around 2400V
using the human body model.
Biasing
None required for traditional operation.
For adjustable limiting, the bias voltage
will set the limiting value as described
under Operation.
Operation
The TC231 has three primary modes
of operation. 10 dBm and 18 dBm
limiting can be done with no active
Not Biased
Not Biased
Biased
10 dBm Limiting
(a)
18 dBm Limiting
(b)
Adjustable Limiting and Detection
(c)
Figure 1. TC231 Functional Topologies
3
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