Metal Oxide Varistors
Straight Lead
Dimensions Table
Series
D max
d*
W**
H max
H1 max
T max
P max
* ±0.02, ** ±1
5D
7
0.6
5
12.5
10
4.9
3
7D
9.5
0.6
5
14.5
12
4.9
3
10D
14
0.8
7.5
20
17
8.5
3
14D
17.5
0.8
7.5
22.5
20.5
8.5
3
20D
24
1
10
29.5
28
9
3
Dimensions : Millimetres
Characteristics
•
•
•
•
•
•
High performance transient voltage suppression
Short response time to surge voltage
Low standby power dissipation
Excellent clamping characteristics
High performance withstanding surge currents
High reliability
Applications
• Surge protection in:
Consumer electronics
Industrial electronics
Communication electronics
Measuring and controlling systems
Electronic home appliances
• Protection against surges induced by lighting striking incoming power lines
• Suppression of surges caused by switching inductive loads such as transformers, relays and coils
• Protection of rectification diodes, SCRs, power transistors, semiconductor devices, etc
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V1.1
Metal Oxide Varistors
Definition of Varistor Terms
Rated RMS Voltage, Rated DC Voltage
The maximum designated values of power system voltage that may be applied continuously between the terminals
of a device
Varistor Voltage
Test characteristic that is used to classify varistors by type. A test current of 1 mA DC is typically used to determine varistor
voltage classification type. Varistor voltage clamping characteristics can be defined at various test levels
Rated Peak Single Pulse Transient Current
Maximum surge current, 8 / 20 μs waveform which a varistor is rated to withstand for a single surge
Rated Single Pulse Transient Energy
Maximum allowable energy for a single impulse (see specified waveforms)
Maximum Clamping Voltage
Measured peak voltage across the device terminals when a current impulse of specified amplitude and waveform is
conducted through the varistor
Typical Capacitance
Typical capacitance values are measured at a test frequency of 1 KHz. Capacitance values are only for reference purpose
only, not subject to outgoing inspection
General Characteristics
Storage Temperature
Operating Surface Temperature
Operating Ambient Temperature
Maximum Voltage Temperature Coefficient
Minimum Insulation Resistance
Hi Pot (Leads To Case, 1 Minimum)
Typical Response Time
Epoxy Rating
Current / Energy Derating (>85°C)
DC Leakage Current
Solderability
: -55°C to +125°C
: 125°C
: -55°C to +85°C (without derating)
: < -0.05% / °C
: 1,000 MΩ
: 2,500V DC
: <15 nano-seconds
: 94V-0
: -2.5% / °C
: 200 μA maximum (at rated dc working voltage)
: MIL-STD-202F
Power Dissipation Ratings (P, in-watts)
Disc Size
5 mm
7 mm
10 mm
14 mm
20 mm
11V AC to 40V AC
0.01
0.02
0.05
0.1
0.2
50V AC to 680V AC
0.15
0.25
0.4
0.6
1
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Page <2>
11/04/12
V1.1
Metal Oxide Varistors
Energy Derating Versus Temperature
Percent of Rated Power Energy
Ambient Temperature, °C
Peak Current Per Pulse Versus Pulse Duration
Number of Pulses on Order from 100%
Respectively :
Percentage of Peak Current Rating
1 Pulse
10 Pulses
10
2
Pulses
10
3
Pulses
10
4
Pulses
10
5
Pulses
10
6
Pulses
Pulse Duration, Microseconds
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Page <3>
11/04/12
V1.1
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