TMOV25SP385M Littelfuse Inc, TMOV25SP385M Datasheet - Page 18

• 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

FIGURE 9C. PICTORIAL VIEW OF HIGH ENERGY
DA, DB AND BA/BB SERIES
BA/BB SERIES
DA SERIES
DB SERIES
Revision: November 5, 2009
Varistor Products
14
Turning now to the high current upturn region in Figure 10,
we see that the V-I behavior approaches an ohmic char-
acteristic. The limiting resistance value depends upon the
electrical conductivity of the body of the semiconducting
ZnO grains, which have carrier concentrations in the range
of 10
below 0.3Ωcm.
Varistor electrical characteristics are conveniently displayed
using log-log format in order to show the wide range of
the V-I curve. The log format also is clearer than a linear
representation which tends to exaggerate the nonlinearity
in proportion to the current scale chosen. A typical V-I
Electrical Characterization Varistor V-I Characteristics
characteristic curve is shown in Figure 10. This plot shows
a wider range of current than is normally provided on varis-
tor data sheets in order to illustrate three distinct regions
of electrical operation.
Equivalent Circuit Model
An electrical model for the varistor can be represented by
the simplified equivalent circuit of Figure 11.
FIGURE 10. TYPICAL VARISTOR V-I CURVE PLOTTED ON
1000
500
200
100
FIGURE 11. VARISTOR EQUIVALENT CIRCUIT MODEL
50
20
10
17
10
(0.002μF)
to 10
-8
LEAKAGE
REGION
18
C
10
LOG-LOG SCALE
per cm
-6
SLOPE =
3
10
. This would put the ZnO resistivity
-4
Please refer to www.littelfuse.com for current information.
NORMAL VARISTOR
CURRENT (A)
-- -
1
Specifications are subject to change without notice.
10
R
L
(1Ω)
V
R
(0 TO
ON
OPERATION
-2
x
(TYPICAL V130LA20A)
(LEAD
INDUCTANCE)
∞
)
(TYPICAL V130LA20A)
10
0
R
(1000MΩ)
I = kV
OFF
10
2
©2009 Littelfuse, Inc.
UPTURN
REGION
10
4