TMOV25SP385M Littelfuse Inc, TMOV25SP385M Datasheet - Page 149

• 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

©2009 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ba or /bb.html for current information.
Stand by Power Dissipation vs Applied V
Temperatures
Power Dissipation Ratings
Should transients occur in rapid succession, the average power
dissipation required is simply the energy (watt-seconds) per pulse
times the number of pulses per second. The power so developed
must be within the specifications shown on the Device Ratings
and Characteristics Table for the specific device. Furthermore,
the operating values need to be derated at high temperatures as
shown in the above diagram. Because varistors can only dissipate
a relatively small amount of average power they are, therefore, not
suitable for repetitive applications that involve substantial amounts
of average power dissipation.
Figure 1
Figure 3
100
90
80
70
60
50
40
30
20
10
0.08
0.06
0.04
0
-55
1.0
0.8
0.6
0.4
0.2
0.1
50
TYPICAL TEMPERATURE COEFFICIENT
OF POWER DISSIPATION = 2.2%/
MAX
MAX
TYP
80
60
PERCENTAGE OF MAXIMUM RATED V
AT
AT
AT
T
T
T
70
AMBIENT TEMPERATURE (
A
A
A
= 25
= 85
= 25
80
o
o
o
C
C
C
90
90
100
110
o
C
o
100
120
C)
Rms
Varistor Products
Industrial High Energy Terminal Varistors > BA/BB Series
at Varied
130
RMS
(%)
140 150
110
Revision: November 5, 2009
145
Typical Stability of Standby Power Dissipation at Rated
V
Peak Pulse Current Test Waveform
Figure 2
Figure 4
RMS
vs Time
0
T = Time from 10% to 90% of Peak
T
T
Example - For an 8/20 μs Current Waveform:
1
1
2
0.5
0.4
0.3
0.2
0.1
= Virtual Origin of Wave
= Rise Time = 1.25 x T
= Decay Time
0
O
100
8μs = T
20μs = T
0
90
50
10
1
1,000 HOURS, T
1
2
= Rise Time
= Decay Time
TIME AT RATED V
T
T
1
A
10
T
= 85
2
Figure 26
o
C
RMS
(HOURS)
100
TIME
BA/BB Varistor Series
1,000