V250LA20A Littelfuse Inc, V250LA20A Datasheet - Page 4

• Manufacturer Part Number: V250LA20A
• Description: VARISTOR 250V 72J 14MM RADIAL LA
• Manufacturer: Littelfuse Inc
• Series: LAr

Specifications of V250LA20A

• Varistor Voltage: 429V
• Current-surge: 4.5kA
• Number Of Circuits: 1
• Maximum Ac Volts: 250VAC
• Maximum Dc Volts: 330VDC
• Energy: 72J
• Package / Case: Disc 14mm
• Product: MOV
• Voltage Rating Dc: 330 V
• Voltage Rating Ac: 250 V
• Clamping Voltage: 650 V
• Peak Surge Current: 4.5 KA
• Surge Energy Rating: 72 J
• Capacitance: 500 pF
• Operating Temperature Range: - 55 C to + 85 C
• Mounting: Radial
• Dimensions: 14 mm Dia.
• Termination Style: Radial
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

LA Varistor Series
Power Dissipation Ratings
Should transients occur in rapid succession, the average
power dissipation is 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 Specifications Table for the specific
device.The operating values of a MOV need to be derated
at high temperatures as shown in the diagram below.
Because varistors only dissipate a relatively small amount
of average power they are not suitable for repetitive
applications that involve substantial amounts of average
power dissipation.
Current Energy and Power Derating Curve
Figure 1
100
90
80
70
60
50
40
30
20
10
0
-55
50
60
70
AMBIENT TEMPERATURE (
80
90
100
110
o
120
C)
Radial Lead Varistors > LA Series
130
140 150
Varistor Products
Revision: August 4, 2010
Peak Pulse Current Test Waveform
Figure 2
0
T = Time from 10% to 90% of Peak
T
T
Example - For an 8/20 μs Current Waveform:
1
1
2
= Virtual Origin of Wave
O
= Rise Time = 1.25 x T
= Decay Time
100
1
90
50
10
8μs = T
20μs = T
Please refer to www.littelfuse.com/series/la.html for current information.
1
2
= Rise Time
= Decay Time
T
T
1
T
2
Specifications are subject to change without notice.
TIME
©2010 Littelfuse, Inc.