Reliability data
Test Test methods/conditions Requirement
Varistor voltage The voltage between two terminals with
the specified measuring current applied
is called V
V
(1 mA
DC
@ 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 V
DC
at UCT
+5/–0 °C is applied for 1000 ±48 h.
The leakage current I
leak
(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 V
V
shall be
measured.
I
leak
(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 30 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
40 ±2 °C, 90 to 95% r. H. for 56 ±2 days
with 10% of the maximum continuous
DC operating voltage V
DC
.
Then stored at room temperature and
normal humidity for 1 to 2 h.
Thereafter, the change of V
V
shall be
measured.
|∆V/V (1 mA)| ≤10%
Note:
UCT = Upper category temperature
LCT = Lower category temperature
Strap varistors B722*
HighE, standard, LS40 series
Page 6 of 14Please read Cautions and warnings and
Important notes at the end of this document.
