2002 Sep 26
7
BCcomponents
Product specification
Low ohmic surge resistor
LSR37
TESTS AND REQUIREMENTS
Essentially all tests are carried out in accordance with the
schedule of “IEC publication 60115-1”, category
LCT/UCT/56 (rated temperature range: Lower Category
Temperature, Upper Category Temperature; damp heat,
long term, 56 days). The testing also covers the requirements
specified by EIA and EIAJ.
The tests are carried out in accordance with IEC publication
60068-2, “Recommended basic climatic and mechanical
robustness testing procedure for electronic components”
and under standard atmospheric conditions according to
“IEC 60068-1”, subclause 5.3.
In Table 4 the tests and requirements are listed with
reference to the relevant clauses of
“IEC publications 60115-1 and 60068-2”; a short
description of the test procedure is also given. In some
instances deviations from the IEC recommendations were
necessary for our method of specifying.
All soldering tests are performed with mildly activated flux.
Table 4
Test procedures and requirements
IEC
60115-1
CLAUSE
IEC
60068-2
TEST
METHOD
TEST
PROCEDURE
REQUIREMENTS
4.16
21 (U)
robustness of terminations:
4.16.2
21 (Ua1)
tensile all samples
∅0.7 mm; load 10 N; 10 s
number of failures
<10 × 10−6
4.16.3
21 (Ub)
bending half number
of samples
∅0.7mm; load 5N; 4 × 90°
number of failures
<10 × 10−6
4.16.4
21 (Uc)
torsion other half
of samples
3
× 360° in opposite directions
no damage
∆R/R max.: ±1.0% + 0.10 Ω
4.17
20 (Ta)
solderability
2 s; 235
°C
good tinning; no damage
4.18
20 (Tb)
resistance to
soldering heat
thermal shock: 3 s; 350
°C;
6 mm from body
∆R/R max.: ±1.0% + 0.10 Ω
4.19
14 (Na)
rapid change of
temperature
30 minutes at
−55 °C and
30 minutes at +155
°C; 5 cycles
∆R/R max.: ±1.0% + 0.10 Ω
4.20
29 (Eb)
bump
3
× 1500 bumps in 3 directions;
40 g
no damage
∆R/R max.: ±1.0% + 0.10 Ω
4.22
6 (Fc)
vibration
frequency 10 to 500 Hz;
displacement 1.5 mm or
acceleration 10 g; 3 directions;
total 6 hours (3
× 2 hours)
no damage
∆R/R max.: ±1.0% + 0.10 Ω
4.23
climatic sequence:
4.23.2
2 (Ba)
dry heat
16 hours; 155
°C
4.23.3
30 (Db)
damp heat (accelerated)
1st cycle
24 hours; 55
°C; 90 to 100% RH
4.23.4
1 (Aa)
cold
2 hours;
−55 °C
4.23.5
13 (M)
low air pressure
2 hours; 8.5 kPa; 15 to 35
°C
4.23.6
30 (Db)
damp heat (accelerated)
remaining cycles
5days; 55
°C; 95 to 100% RH
Rins min.: 103 MΩ
∆R/R max.: ±3.0% + 0.1 Ω
4.24.2
3 (Ca)
damp heat
(steady state)
56 days; 40
°C; 90 to 95% RH;
dissipation 0.01 Pn;
limiting voltage 100 V (DC)
∆R/R max.: ±3.0% + 0.1 Ω
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