Efficient and Cost Effective ESD Protection with CeraDiodes
What are CeraDiodes?
CeraDiodes are ceramic multilayer semiconductor
components for the ESD protection of data, audio
and video lines (e.g. USB, Ethernet, IEEE 1394 and
HDMI), analog and digital connections, ICs and
inputs/outputs in electronic equipment. They are
cost effective alternatives to ESD protection components
based on semiconductors such as Zener
and TVS diodes, to which they are also technically
superior. In many cases, they can replace these
semiconductor diodes on a one-to-one basis with
respect to form, fit and function.
Properties and Advantages of CeraDiodes
CeraDiodes are fully bidirectional components.
They satisfy the requirements of the international
ESD standard IEC 61000-4-2, level 4, tested
within the human body model (330Ω/150pF).
The ESD protection properties of CeraDiodes
are constant up to an operating temperature
of 85°C, whereas those of semiconductor
diodes already begin to derate from
25°C (see Figure 1). Moreover, the
reaction time for CeraDiodes is under
0.5ns.
Figure 1. Derating of the ESD protection properties of semiconductor diodes and CeraDiodes
Product Range
The range of CeraDiodes comprises
the single series 0402 (SOD723),
0603 (SOD523) and 1003 (SOD323)
and the arrays 0508, 0612 (both
4-in-1), 0506 (SOT666) and 1012
(SOT 23-6L) with various operating
voltages (VDC) of 5.6V to 30V and
capacitances from 0.6 to 470pF.
ESD Protection of High Speed Lines
Since high speed data lines such as USB, IEEE
1394 and Ethernet carry very high data rates of
several 100Mbit/s, the capacitance of the ESD
protection component must be minimized in
order to avoid transmission losses. The CeraDiodes
of the high speed series satisfy the requirements
of USB 2.0, IEEE 1394, Ethernet
and others thanks to their low capacitances
of 0.6 to 10pF (verified in compliance tests).
These interfaces can be protected by both, single
components or space saving arrays.
Application Examples
The 0506 array CDA3C05GTH (pitch 500) protects
either one or two USB 2.0 ports or an IEEE 1394
interface with only a single component and no
special interconnection layouts.
Figure 2. ESD protection of one (left) or two (right) USB 2.0 ports
Figure 3. ESD protection of an IEEE1394 interface with the 0506 array and an Ethernet interface with a 4-in-1 array
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