B722 datasheet(9/22 Pages) EPCOS

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Reliability data

Test

Test methods/conditions

Requirement

Varistor voltage

The voltage between two terminals with

the specified measuring current applied

is called VV (1 mADC @ 0.2 ... 2 s).

To meet the specified value

Clamping voltage

The maximum voltage between two

terminals with the specified standard

impulse current (8/20 µs) applied.

To meet the specified value

Max. DC operating

voltage

The maximum allowable DC operating

voltage VDC at UCT +5/–0

°C is applied

for 1000

±48 h.

The leakage current Ileak (t) during test is

recorded.

Then the specimen shall be stored at

room temperature and normal humidity

for 1 to 2 h.

Thereafter, the change of VV shall be

measured.

Ileak (t = 1000 h)

≤ I

leak (t = 0 h)

∆V/V (1 mA)| ≤10%

Surge current derating,

8/20

µs

10 surge currents (8/20 µs), unipolar,

interval

≥60 s, amplitude corresponding

to derating curve for 10 impulses at

20 µs

∆V/V (1 mA)| ≤10%

(measured in direction of

surge current)

No visible damage

Fast temperature cycling IEC 60068-2-14, test Na, LCT/UCT,

dwell time 120 min, 5 cycles

∆V/V (1 mA)| ≤10%

No visible damage

Damp heat, steady state IEC 60068-2-78

The specimen shall be subjected to

±2 °C, 90 to 95% r. H. for 56 ±2 days

with 10% of the maximum continuous

DC operating voltage VDC.Then stored

at room temperature and normal

humidity for 1 to 2 h.

Thereafter, the change of VV shall be

measured.

∆V/V (1 mA)| ≤10%

Note:

UCT = Upper category temperature

LCT = Lower category temperature

Block varistors

B722*

HighE series

Page 9 of 22

Please read Cautions and warnings and

Important notes at the end of this document.

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