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New Products
1
Transient Voltage Suppression
Introduction
To address the changing application needs for transient
voltage suppression, Harris has developed and brought to
market a number of new products.
Highlighted in this section is a brief description of these new
devices, extensions of existing products and other new
enhancements to the Harris Transient Voltage Suppression
Devices portfolio.
These new products and innovations are intended to:
• Offer the designer more options in order to help protect
today’s electrical/electronic components and circuits.
• Provide the transient voltage suppression required to
ensure ElectroMagnetic Compatibility (EMC) in those
systems that must meet various safety standards or
international legislated compliance.
• Provide the device performance levels required of the
TVSS product industry.
HB34 Series
This new device is intended for Industrial AC line
applications requiring high energy Varistors with a printed
circuit “through-hole” mounting capability. The HB34 series
is an encapsulated 34mm square disc providing high surge
current, energy and pulse life. Its tinned copper terminals
are specially crimped to allow seating on top of a printed
circuit card while permitting bottom-side soldering to the
board. The HB34 is rated up to 40kA to the 8x20 Surge
waveform and may be operated up to 85
o
C without
derating. See data sheet file number 4764 in Section 4 for
details. TVSS products, AC distribution, and 3-phase
systems are primary applications of the HB34.
SP723
The Integrated Protection series of IC Arrays is expanded
with the addition of this higher rated type. The same
patented SCR/Diode structure of the other SP Series
devices is used however, the SP723 is specifically
designed and rated to withstand the IEC 1000-4-2 model
for ESD testing to level 4 (15kV air discharge / 8kV contact
discharge), as well as MIL-STD-3015.7 to 25kV.
As with the SP720 and SP721 types, the SP723 is applied to
protect other Silicon devices, operating up to 35V
DC
, on
data, signal and control lines, but to very harsh ESD
conditions. The SP723 is supplied in 8 lead PDIP or SOIC
packages to protect up to 6 lines. Data sheets are shown in
Section 6 with supplemental Application Notes in Section 10.
UltraMOV™
Harris has introduced a new series of Varistors called
“UltraMOV™”. These devices, intended for AC line
applications, offer high peak current and energy capability
in the 7, 10, 14, and 20mm size disks in radial lead
packages. Standard operating voltage ratings are from
130V to 625V
RMS
for most single, split, and three phase
AC applications. With peak current ratings up to a true
10kA (20mm, 8x20µs), these devices offer new options for
the TVSS OEM in meeting surge requirements such as
specified in the new UL1449 (Second Edition) and are ideal
for new designs, or existing designs presently using the
Harris LA or C-III Series of radial MOVs. The data sheet is
provided in Section 4.
SP724
The new SP724 IC Array is a four section device housed in
the 6 lead SOT-23 package, allowing the designer more
flexibility with board placement and trace routing. The new
cell design offers improved ESD immunity over the earlier
SP720 and SP721 devices while still providing the same
low input leakage and capacitance with the Harris
proprietary circuit design. The SP724 may be operated at
any supply voltage from 1V
DC
to 20V
DC
and is fully rated
to common ESD standards as well as longer duration
transients. See Section 6 for details.
MLN Array
The newest Multilayer Suppressor family member data
sheet can be found in Section 5. This four-channel array is
manufactured in the 1206 leadless chip form. Besides
providing transient suppression for up to four independent
lines, the MLN Array is characterized for AC parameters so
the designer can take advantage of its high frequency
noise/filter capabilities. Each section is also rated for ESD
clamping as well as 8x20 wave peak current. Like all Harris
Multilayer devices, the MLN may be operated up to 125
o
C
without derating, and like the MLE Series, at supply
voltages up to 18V
DC
. Choose the MLN Array for data,
signal or control line applications.
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UltraMOV™ is a trademark of Harris Corporation
New Products
MLE Series
This special version of our Multilayer Series of leadless
chips was specifically designed for ESD and low pass filter
applications. The MLE Series is offered in 0603, 0805, and
1206 chip sizes for operation from 3.5V
DC
to 18V
DC
.
These devices are rated to the IEC 1000-4-2 ESD level 4
(15kV air discharge, 8kV contact discharge) and, therefore,
can help products meet EMC compliance. The MLE series
finds application on power supply, signal/control lines, and
across components subject to ESD. The newest members
are standard low capacitance versions in 0603 and 0805
size. The inherent capacitance of this Multilayer device
makes it suited to filter applications, therefore, high
frequency impedance characteristics are rated as well.
Section 5 contains the Multilayer data sheets.
New Options for CA Series Varistor Discs
The CA Series of unencapsulated disc varistors are offered
for the customer who desires to provide special lead
assembly such as soldered terminals or pressure contact
terminals. Harris now offers two metallization options for
this series. One is a screened-on sintered Silver. The
second is an arc-sprayed Aluminum. Additionally, these
discs may now be ordered with or without the resistive
edge passivation.
The CA Series is supplied in 32, 40, and 60mm round disc
form. Data sheets are provided in Section 4.
SPICE/PSPICE® Models for Varistor
Products and Multilayer Products
As an aid to the circuit designer Harris has made available at
its web site SPICE/PSPICE design models for many devices
in these product families. Harris models include both
“standby region” as well as “clamping region” performance
characteristics for a fully representative V-I model. On
request, Harris will provide models for other types. Contact
Harris Sales for specific type requests. Refer to site address
http://semidev.mis.semi.harris.com/families/
models.htm#Transient
New ML Series Types and Extended
Voltage Types
Dielectric material and process advances have made
possible the addition of higher voltage ML Series Multilayer
Suppressors, extending the working voltage operating range
of this Series. The 1210 chip size will now offer standard
85V
DC
and 120V
DC
devices.
Additionally, twelve new standard types have been
introduced that will offer specific working voltages from
9V
DC
through 60V
DC
in specific sizes of either 0603, 0805,
or 1210.
A new 1206 sized chip is now included with the 1210, 1812,
and 2220 sizes of the automotive AUML Series.
As with all of our Multilayer families, custom voltage,
capacitance and energy types can be manufactured for
specific customer requirements. See Section 5 for the
complete ML data sheet and Section 10 for associated
application notes.
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PSPICE® is a registered trademark of MicroSim Corporation.

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