MYG Varistors Data Sheet

Electrical Performance Characteristics

Characteristics

Test Method

Specifications

Standard test condition

Environmental conditions under which every measuring is done

without doubt on the measuring results. Unless specified, the

temperature, and relative humidity should be 5 to 35

and 45 to

85% respectively.

Varistor voltage

The varistor voltage is measured with an impressed current of 1mA

(exception, 5 :0.1mA) and serves to characterize each varistor

type.

To meet the

specified value

Maximum operating voltage

The maximum sinusoidal RMS voltage or maximum DC voltage that

can be applied continuously in the specified environmental

temperature range.

Maximum clamping voltage

Maximum clamping voltage is the maximum voltage VP between two

terminals with the specified standard impulse current IP (8/20µS).

Withstanding surge current

The maximum current within the varistor voltage change of ±10%

with the standard impulse current (8/20µS) applied one or two times.

Energy

The maximum energy within the varistor voltage change of±10%

when one impulse of 10/1000µs m-sec is applied.

Rated power

The maximum power that can be applied within the specified

ambient temperature.

Capacitance

The capacitance of varistor is the typical value measured at 1 KHz,

1Vrms max, OV bias and 25±2

.

Temperature Coefficient of

varistor Voltage

(VC at 85

- VC at 25 ) / (VC at 25 ) * 1 / 60 * 100 (%/ )

-0.05%/

max.

Mechanical Performance Characteristics

Characteristics

Test Methods

Specifications

Robustness of Terminations

(Tensile)

After gradually applying the force specified below and keeping the

unit fixed for ten seconds, the terminal shall be visually examined for

any damage.

Terminal diameter

Force

0.6mm

9.8N (1.0kgf)

0.8mm

9.8N (1.0kgf)

1.0mm

19.6N (2.0kgf)

Robustness of

Terminations

(Bending)

The unit shall be secured with its terminal kept vertical and the force

specified below be applied in the axial direction. The terminal shall

gradually be bent by 90° in one direction, then 90

° in the opposite

direction, and again back to the original position. The damage of the

terminal shall be visually examined.

Terminal diameter

Force

0.6mm

4.9N (0.5kgf)

0.8mm

4.9N (0.5kgf)

1.0mm

9.8N (1.0kgf)

Vibration

After repeatedly applying a single harmonic vibration (amplitude:

0.75 mm): double amplitude: 1.5 mm with 1 minute vibration

frequency cycles (10 Hz to 55 Hz to 10 Hz) to each of three

perpendicular directions for 2 hours. Thereafter, the unit shall be

visually examined.

No outstanding

damage

Solderability

After dipping the terminals to a depth of approximately 3 mm from

the body in a soldering bath of 235±5

for 2±0.5 seconds, the

terminal shall be visually examined.

Approximately

95% of the

terminals shall

be covered with

solder uniformly.

Resistance to Soldering

Heat

After each lead shall be dipped into a solder bath having a

temperature 260±5

to a point 2.0 to 2.5 mm from the body of the

unit, using shielding board (t=1.5mm), be held there for specified

time (5 series: 5±1 s and others: 10±1 s), and then be stored at room

temperature and humidity for 1 to 2 hours. The change of Vc and

mechanical damages are examined.

VcmA/VcmA

±5% No

outstanding

damage

4