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DATA SHEET
LSR37 Low ohmic surge resistor
Product specification Supersedes data of 15th March 2001 File under BCcomponents, BC08 2002 Sep 26
BCcomponents
Product specification
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Low ohmic surge resistor
FEATURES QUICK REFERENCE DATA DESCRIPTION Resistance range Resistance tolerance and series Maximum dissipation at Tamb = 70 C Thermal resistance, Rth Temperature coefficient Voltage coefficient Maximum permissible voltage Dielectric withstanding voltage of the insulation for 1 minute Basic specifications Climatic category (IEC 60068) Stability after: load (1000 hours) climatic test soldering High voltage test for R-value > 3.3 k, 10 kV; 1 nF; 50 x 12/minutes ESD contact discharge 12 kV; 100 pulses Table 1 ORDERING INFORMATION Ordering code (12NC) TYPE IEC 60115-1B 55/155/56 VALUE
LSR37
* High pulse-loading capability (flashes) * Good replacement for carbon-composite resistors.
APPLICATIONS
1 k to 10 k 220 to 910 10%; 20%; E12 series 0.5 W 120 K/W 0 to +600 x 10-6/K -600 to +200 x 10-6/K 0 to +350 x 10-6/K
* Application for overload and high voltage pulse hazard circuits (TV-sets, monitors).
DESCRIPTION A metal glazed film is deposited on a high grade ceramic body. After that caps are applied to the rods and electrolytic copper wires are welded to these end caps. The resistors are coated with a light-blue lacquer which provides electrical, mechanical and climatic protection. The encapsulation is resistant to all cleaning solvents according to "MIL-STD 202E, method 215" and "IEC 60068-2-45".
50 x 10-6/V Pn x R
V=
700 V
R/R max.: 3% + 0.1 R/R max.: 3% + 0.1 R/R max.: 1% + 0.1 R/R max.: 20% (typical value 10%) R/R max.: 20% (typical value: 10%)
Ordering code as function of tolerance and packaging TOLERANCE (%) ORDERING CODE 2322 245 ..... 1000 units IN AMMOPACK 12... 11... ORDERING EXAMPLE The ordering code for a LSR37, resistor value 1.5 kW, 10% tolerance, supplied on a bandolier of 1000 units in ammopack, is: 2322 245 12152. 5000 units ON REEL 22... 21...
* The resistors have a 12-digit ordering code staring with 2322 245 * The subsequent 2 digits indicate the resistor type and packaging; see Table 1. * The remaining digits indicate the resistance value:
- The first 2 digits indicate the resistance value. - The last digit indicates the resistance decade in accordance with Table 2.
LSR37
10 20
Last digit of 12NC LAST DIGIT 1 2 3
Table 2
RESISTANCE DECADE 220 to 910 1 to 9.1 k 10 k
2002 Sep 26
2
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Low ohmic surge resistor
FUNCTIONAL DESCRIPTION Product characterization
LSR37
Standard values of rated resistance (nominal resistance) are taken from the E12 series with a tolerance of 10% or 20%.The values of the E12 series are in accordance with "IEC publication 60063". The limiting voltage DC is not applicable, because the maximum rated voltage for the maximum Rn-value of 10 k at Pn = 0.5 W is only 70.7 V. The maximum permissible hot-spot temperature is 155 C. Limiting values TYPE LSR37 Note 1. The maximum voltage that may be continuously applied to the resistor element, see "IEC publication 60115-1". DERATING The power that the resistor can dissipate depends on the operating temperature; see Fig.1. LIMITING VOLTAGE(1) (V) LIMITING POWER (W) 0.5
V=
Pn x R
Pmax (%Prated) 100
CCB412
50
0 -55
0
50
70
100
155 Tamb (C)
Fig.1
Maximum dissipation (Pmax) in percentage of rated power as a function of the ambient temperature (Tamb).
2002 Sep 26
3
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Low ohmic surge resistor
PULSE LOADING CAPABILITY
LSR37
104 Pmax (W) 103
CCB944
102
10
1 10-6
10-5
10-4
10-3
10-2
10-1 ti (s)
1
Fig.2
Pulse on a regular basis; maximum permissible peak pulse power P max as a function of pulse duration (ti) for single pulse condition.
2002 Sep 26
4
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Low ohmic surge resistor
Application information
LSR37
The resistors with straight leads are suitable for processing on automatic insertion equipment and cutting and bending machines.The minimum pitch for this type is 6e (15.0 mm). For temperature rise at soldering place see Fig.4.
80 T (K) 60
CCB361
50 T (K) 40 5 mm
CCB360
30 40 20
10 mm 15 mm
20 10
0
0
0.4
0.8
P (W)
1.2
0
0
0.4
0.8
P (W)
1.2
Fig.4 Fig.3 Hot-spot temperature rise (T) as a function of dissipated power.
Temperature rise (T) at the lead end (soldering point) as a function of dissipated power at various lead lengths after mounting.
2002 Sep 26
5
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Product specification
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Low ohmic surge resistor
MECHANICAL DATA Mass per 100 units TYPE LSR37 Marking The nominal resistance and tolerance are marked on the resistor using coloured bands in accordance with IEC publication 60062 "Colour codes for fixed resistors". Three bands are used for 20% tolerance with no indication for the tolerance. Four bands are used for 10% tolerance. Grey is used instead of silver for 10% and yellow is used instead of gold for 5% because metal particles in the lacquer could affect high-voltage properties. Outlines The length of the body (L1) is measured by inserting the leads into holes of two identical gauge plates and moving these plates parallel to each other until the resistor body is clamped without deformation ("IEC publication 60294"). Table 3
For dimensions see Table 3.
LSR37
MASS (g) 53.2
L1
d
CCB414
D L2
Fig.5 Outline.
Resistor type and relevant physical dimensions; see Fig.5
TYPE LSR37
D MAX. (mm)
4.0
L1 MAX. (mm) 9.0
L2 MAX. (mm) 10.0
d (mm)
0.7 0.03
2002 Sep 26
6
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Product specification
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Low ohmic surge resistor
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. Table 4 Test procedures and requirements IEC 60068-2 TEST METHOD 21 (U) 21 (Ua1) 21 (Ub) 21 (Uc) 20 (Ta) 20 (Tb) 14 (Na) 29 (Eb) 6 (Fc)
LSR37
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.
IEC 60115-1 CLAUSE 4.16 4.16.2 4.16.3 4.16.4 4.17 4.18 4.19 4.20 4.22
TEST
PROCEDURE
REQUIREMENTS
robustness of terminations: tensile all samples bending half number of samples torsion other half of samples solderability resistance to soldering heat rapid change of temperature bump vibration
0.7 mm; load 10 N; 10 s 0.7 mm; load 5 N; 4 x 90
3 x 360 in opposite directions 2 s; 235 C thermal shock: 3 s; 350 C; 6 mm from body 30 minutes at -55 C and 30 minutes at +155 C; 5 cycles 3 x 1500 bumps in 3 directions; 40 g frequency 10 to 500 Hz; displacement 1.5 mm or acceleration 10 g; 3 directions; total 6 hours (3 x 2 hours) 16 hours; 155 C 24 hours; 55 C; 90 to 100% RH 2 hours; -55 C 2 hours; 8.5 kPa; 15 to 35 C 5 days; 55 C; 95 to 100% RH 56 days; 40 C; 90 to 95% RH; dissipation 0.01 Pn; limiting voltage 100 V (DC) 7
number of failures <10 x 10-6 number of failures <10 x 10-6 no damage R/R max.: 1.0% + 0.10 good tinning; no damage
R/R max.: 1.0% + 0.10 R/R max.: 1.0% + 0.10
no damage R/R max.: 1.0% + 0.10 no damage R/R max.: 1.0% + 0.10
4.23 4.23.2 4.23.3 4.23.4 4.23.5 4.23.6 4.24.2 2 (Ba) 30 (Db) 1 (Aa) 13 (M) 30 (Db) 3 (Ca)
climatic sequence: dry heat damp heat (accelerated) 1st cycle cold low air pressure damp heat (accelerated) remaining cycles damp heat (steady state)
Rins min.: 103 M
R/R max.: 3.0% + 0.1 R/R max.: 3.0% + 0.1
2002 Sep 26
BCcomponents
Product specification
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Low ohmic surge resistor
LSR37
IEC 60115-1 CLAUSE 4.25.1 4.8.4 4.7 4.6.1.1 4.13
IEC 60068-2 TEST METHOD endurance
TEST
PROCEDURE 1000 hours at 70 C; Pn or Vmax 220 to 910 1 k to 10 k
REQUIREMENTS
R/R max.: 3.0% + 0.1
0 to +600 x 10-6/K
temperature coefficient
-600 to +200 x 10-6/K
no breakdown Rins min.: 104 M
voltage proof on insulation 700 V (RMS) during 1 minute; V-block method insulation resistance short time overload 500 V (DC) during 1 minute; V-block method room temperature; dissipation 6.25 x Pn; 10 cycles; 5 s on and 45 s off for Rn > 3.3 k
R/R max.: 2.5% + 0.10
high voltage pulse 10 kV; 1 nF; 50 x 12/min
R/R max.: 20% (typical value 10%) R/R max.: 20% (typical value: 10%)
no flaming of gauze cylinder
12 kV ESD test; 100 pulses ESD contact discharge 4.26 active flammability "Cheese-cloth test" passive flammability "Needle-flame test" 5 x Pn (RMS) duration 5 minutes
Other test in accordance with IEC 60695 2.2 application of test flame for 20 s no ignition of product no ignition of under-layer burning time less than 30 s
2002 Sep 26
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