V39MA2B Littelfuse Inc, V39MA2B Datasheet - Page 3

• Manufacturer Part Number: V39MA2B
• Description: VARISTOR 39V 1MA .18J 3MM AXIAL
• Manufacturer: Littelfuse Inc
• Series: MAr
• Type: MOVr

Specifications of V39MA2B

• Varistor Voltage: 39V
• Current-surge: 40A
• Number Of Circuits: 1
• Maximum Ac Volts: 25VAC
• Maximum Dc Volts: 31VDC
• Energy: 0.18J
• Package / Case: Axial
• Suppressor Type: Varistor
• Peak Surge Current @ 8/20µs: 40A
• Clamping Voltage Vc Max: 79V
• Peak Energy (10/1000us): 0.18J
• Voltage Rating Vdc: 31V
• Voltage Rating Vac: 25V
• Product: MOV
• Voltage Rating Dc: 31 V
• Voltage Rating Ac: 25 V
• Clamping Voltage: 79 V
• Peak Surge Current: 40 A
• Surge Energy Rating: 0.18 J
• Capacitance: 250 pF
• Operating Temperature Range: - 55 C to + 85 C
• Mounting: Radial
• Dimensions: 3 mm Dia. x 31.0 mm L
• Termination Style: Axial
• Brand/series: MA Series
• Current, Peak: 40 A
• Energy Rating: 0.16 Joules
• Package: Leads
• Technology: Metal Oxide
• Voltage, Ac: 25 VAC
• Voltage, Clamping: 47 V
• Voltage, Dc: 31 VDC
• Voltage, Varistor: 43
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: F2280; V39MA2B

V18MA - V100MA
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to www.littelfuse.com/series/ma.html for current information.
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 Specifications table for the specific device.
Furthermore, the operating values need to be derated at high
temperatures as shown above. 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.
Repetitive Surge Capability
Figure 3
Figure 1
100
90
80
70
60
50
40
30
20
10
0
-55
0.5
0.2
0.1
50
20
10
5
2
1
20
10
10
10
1
2
10
50
INDEFINITE
2
3
4
60
100
AMBIENT TEMPERATURE (
70
IMPULSE DURATION (μs)
80
90
100 110
10
1,000
5
10
DISC SIZE 3mm
V18MA1A - V100MA4B
6
120 130 140 150
Varistor Products
o
Axial Lead / Application Specific Varistors > MA Series
C)
10,000
Revision: January 9, 2009
185
V120MA1A/S - V430MA3A
NOTE: If pulse ratings are exceeded, a shift of V
+/-10% could result. This type of shift, which normally results in a decrease of V
result in the device not meeting the original published specifications, but it does not
prevent the device from continuing to function, and to provide ample protection.
Peak Pulse Current Test Waveform
Figure 4
Figure 2
0
T = Time from 10% to 90% of Peak
T
T
Example - For an 8/20 μs Current Waveform:
100
1
1
2
0.5
0.2
0.1
50
20
10
= Virtual Origin of Wave
5
2
1
= Rise Time = 1.25 x T
= Decay Time
20
8μs = T
20μs = T
10
10
2
O
100
2
1
90
50
10
INDEFINITE
1
1
2
= Rise Time
= Decay Time
100
IMPULSE DURATION (μs)
T
T
1
T
2
N(DC)
10
10
3
10
(at specified current) of more than
4
10
5
DISC SIZE 3mm
V120MA1A - V430MA7B
6
1,000
TIME
MA Varistor Series
10,000
N(DC)
, may