BCcomponents
Product specification
Low ohmic surge resistor
FEATURES
QUICK REFERENCE DATA
DESCRIPTION
Resistance range
Resistance tolerance and series
Maximum dissipation at
T
amb
= 70
°
C
Thermal resistance, R
th
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
Ω
, 10 kV; 1 nF;
50
×
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
Ω
to 10 k
Ω
220
Ω
to 910
Ω
±
10%;
±
20%; E12 series
0.5 W
120 K/W
0 to +600
×
10
−6
/K
−
600 to +200
×
10
−6
/K
0 to +350
×
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
×
10
−6
/V
P
n
×
R
V
=
700 V
∆
R/R max.:
±
3% + 0.1
Ω
∆
R/R max.:
±
3% + 0.1
Ω
∆
R/R max.:
±
1% + 0.1
Ω
∆
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...
O
RDERING 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
Ω
1 to 9.1 k
Ω
10 k
Ω
2002 Sep 26
2
BCcomponents
Product specification
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 R
n
-value of 10 k
Ω
at
P
n
= 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”.
D
ERATING
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
=
P
n
×
R
P
max
(%P
rated
)
100
CCB412
50
0
−55
0
50
70
100
155
T
amb
(°C)
Fig.1
Maximum dissipation (P
max
) in percentage of rated power
as a function of the ambient temperature (T
amb
).
2002 Sep 26
3
BCcomponents
Product specification
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
Analog electronics
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