V250LA2 Littelfuse Inc, V250LA2 Datasheet - Page 4

• Manufacturer Part Number: V250LA2
• Description: VARISTOR 250V 21J 7MM RADIAL LA
• Manufacturer: Littelfuse Inc
• Series: LAr
• Type: MOVr

Specifications of V250LA2

• Energy: 21J
• Varistor Voltage: 473V
• Current-surge: 1.2kA
• Number Of Circuits: 1
• Maximum Ac Volts: 250VAC
• Maximum Dc Volts: 330VDC
• Package / Case: Disc 7mm
• Technology: Metal Oxide
• Capacitance Value: 90pF
• Clamping Current: 10A
• Clamping Voltage: 730V
• Lead Style: Radial
• Ac Voltage Rating (max): 250VAC
• Dc Voltage Rating (max): 330VDC
• Operating Temp Range: -55C to 85C
• Mounting: Through Hole
• Surge Current (max): 1200A
• Lead Spacing: 6mm
• Product Depth (mm): 5.6mm
• Product Height (mm): 12mm
• Product Diameter (mm): 9mm
• Product: MOV
• Voltage Rating Dc: 330 V
• Voltage Rating Ac: 250 V
• Peak Surge Current: 1.2 KA
• Surge Energy Rating: 21 J
• Capacitance: 90 pF
• Operating Temperature Range: - 55 C to + 85 C
• Dimensions: 7 mm Dia.
• Termination Style: Radial
• Brand/series: LA Series
• Current, Peak: 1200 A
• Electric Strength: 2500 V
• Energy Rating: 21 Joules
• Package: Leads
• Power Rating: 21 Joules (Max.) @ +85 °C
• Resistance, Insulation: 1000 Megohms
• Temperature, Operating, Maximum: 85 °C
• Temperature, Operating, Minimum: –55 °C
• Terminal Type: Radial Leaded
• Voltage, Ac: 250 VAC
• Voltage, Clamping: 730 V
• Voltage, Dc: 330 VDC
• Voltage, Operating: 250 VAC @ +85 °C, 330 VDC @ +85 °C
• Voltage, Varistor: 473
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: 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.