TMOV25SP385M Littelfuse Inc, TMOV25SP385M Datasheet - Page 25

• 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.
Terms and Descriptions
Clamping Voltage. Peak voltage across the varistor measured under conditions of a specified peak V
and specified waveform. NOTE: Peak voltage and peak currents are not necessarily coincidental in time.
Rated Peak Single Pulse Transient Currents (Varistor). Maximum peak current which may be applied for a single
8/20μs impulse, with rated line voltage also applied, without causing device failure.
Lifetime Rated Pulse Currents (Varistor). Derated values of I
waveshape, and for multiple pulses which may be applied over device rated lifetime.
Rated RMS Voltage (Varistor). Maximum continuous sinusoidal RMS voltage which may be applied.
Rated DC Voltage (Varistor). Maximum continuous DC voltage which may be applied.
DC Standby Current (Varistor). Varistor current measured at rated voltage, V
For certain applications, some of the following terms may be useful.
Nominal Varistor Voltage. Voltage across the varistor measured at a specified pulsed DC current, I
specific duration. I
Peak Nominal Varistor Voltage. Voltage across the varistor measured at a specified peak AC current, I
specific duration. I
Rated Recurrent Peak Voltage (Varistor). Maximum recurrent peak voltage which may be applied for a
specified duty cycle and waveform.
Rated Single Pulse Transient Energy (Varistor). Energy which may be dissipated for a single impulse of maximum
rated current at a specified waveshape, with rated RMS voltage or rated DC voltage also applied, without causing
device failure.
Rated Transient Average Power Dissipation (Varistor). Maximum average power which may be dissipated due to a
group of pulses occurring within a specified isolated time period, without causing device failure.
Varistor Voltage. Voltage across the varistor measured at a given current, I
Voltage Clamping Ratio (Varistor). A figure of merit measure of the varistor clamping effectiveness as defined by
the symbols (V
Nonlinear Exponent. A measure of varistor nonlinearity between two given operating currents, I
described by I = kV
Dynamic Impedance (Varistor). A measure of small signal impedance at a given operating point as defined by:
Z
Resistance (Varistor). Static resistance of the varistor at a given operating point as defined by:
R
Capacitance (Varistor). Capacitance between the two terminals of the varistor measured at C specified
frequency and bias.
AC Standby Power (Varistor). Varistor AC power dissipation measured at rated RMS voltage V
Voltage Overshoot (Varistor). The excess voltage above the clamping voltage of the device for a given current that
occurs when current waves of less than 8μs virtual front duration are applied. This value may be expressed as a % of
the clamping voltage (V
Response Time (Varistor). The time between the point at which the wave exceeds the clamping voltage level (V
and the peak of the voltage overshoot. For the purpose of this definition, clamping voltage as defined with an 8/20μs
current waveform of the same peak current amplitude as the waveform used for this response time.
Overshoot Duration (Varistor). The time between the point voltage level (V
overshoot has decayed to 50% of its peak. For the purpose of this definition, clamping voltage is defined with an
8/20μs current waveform of the same peak current amplitude as the waveform used for this overshoot duration.
X
X
= ( dV
= ( V
TABLE 3. VARISTOR CHARACTERISTICS (IEEE STANDARD C62.33-1982 SUBSECTION 2.3 AND 2.4)
X
) ÷ ( I
X
) ÷ ( dI
X
C
)
) ÷ (V
X
)
N(DC)
N(AC)
a
where k is a device constant, I
M(AC)
is specified by the varistor manufacturer.
of specific duration. I
C
) for an 8/20 current wave.
), (V
C
) ÷ (V
M(DC)
).
N(DC)
Varistor Products
is specified by the varistor manufacturer.
1
≤ I ≤ I
2
, and a
Revision: November 5, 2009
TM
for impulse durations exceeding that of an 8/20μs
12
= ( logI
21
2
X
/ I
.
C
) and the point at which the voltage
M(DC)
1
) ÷ ( logV
.
2
/ V
1
)
M(AC)
1
and I
.
N(DC)
C
pulse current
, of
N(AC)
2
, as
, of
C
)
Symbol
V
V
V
V
V
W
C
V
V
I
M(AC)
M(DC)
V
R
V
N(DC)
N(AC)
Z
P
I
a
C
TM
/V
-
PM
OS
-
-
D
C
TM
X
D
X
X
PM