TMOV25SP385M Littelfuse Inc, TMOV25SP385M Datasheet - Page 13

• Manufacturer Part Number: TMOV25SP385M
• Description: TMOV VARISTOR PB FREE 25S
• Manufacturer: Littelfuse Inc
• Series: iTMOV®r

Specifications of TMOV25SP385M

• Varistor Voltage: 682V
• Current-surge: 20kA
• Number Of Circuits: 1
• Maximum Ac Volts: 385VAC
• Energy: 430J
• Package / Case: Disc 25mm 3-Lead
• Suppressor Type: Varistor
• Peak Surge Current @ 8/20µs: 20000A
• Varistor Case: 25mm DISC
• Clamping Voltage Vc Max: 1010V
• Peak Energy (10/1000us): 430J
• Voltage Rating Vdc: 682V
• Voltage Rating Vac: 385V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Maximum Dc Volts: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Specifications are subject to change without notice.
Please refer to www.littelfuse.com for current information.
©2009 Littelfuse, Inc.
Figure 5. Cloud-to-Ground Lightning Strike
Figure 6. Peak Pulse Current Test Waveform
Figure 5, on the following page, shows the effect of a
cloud-to-ground strike: the transient–generating effect is far
greater.
Figure 6, shows a typical current waveform for induced l
ightning disturbances.
10km
O
100
1
90
50
10
1km
100m
T
T
1
11kV
1100 V
Varistor Products
TIME
110 V
Revision: November 5, 2009
9
Technological Solutions for Transient Threats
Because of the various types of transients and applications,
it is important to correctly match the suppression solution
to the different applications. Littelfuse offers the broadest
range of circuit protection technologies to ensure that you
get the proper solution for your application. Please consult
our online library of Application Notes and Design Notes for
further information on common design issues encountered
at http://www.littelfuse.com.
Metal Oxide Varistors and Multi-Layered Varistors
Varistors are voltage dependent, nonlinear devices which
have electrical characteristics similar to back-to- back Zener
diodes. They are composed primarily of Z
additions of other metal oxides such as Bismuth, Cobalt,
Magnese and others. The Metal Oxide Varistor or "MOV" is
sintered during the manufacturing operation into a ceramic
semiconductor and results in a crystalline microstructure
that allows MOVs to dissipate very high levels of transient
energy across the entire bulk of the device. Therefore,
MOVs are typically used for the suppression of lightning
and other high energy transients found in industrial or
AC line applications. Additionally, MOVs are used in DC
circuits such as low voltage power supplies and automobile
applications. Their manufacturing process permits many
different form factors with the radial leaded disc being the
most common.
Multilayer Varistors or MLVs are constructed of Z
material similar to standard MOVs, however, they are
fabricated with interweaved layers of metal electrodes and
supplied in leadless ceramic packages. As with standard
MOVs, Multilayers transition from a high impedance to a
conduction state when subjected to voltages that exceed
their nominal voltage rating. MLVs are constructed in
various chip form sizes and are capable of significant surge
energy for their physical size. Thus, data line and power
supply suppression are achieved with one technology.
The following parameters apply to Varistors and/or
Multilayer Varistors and should be understood by the
circuit designer to properly select a device for a given
application.
The three Littelfuse technologies described offer a
comprehensive choice for the designer. Reviewing the
attributes of each can result in a suitable ESD suppression
solution for most applications. See the individual data
sheets for specific electrical and mechanical information.
N
O with small
N
O