2002 Sep 26
2
BCcomponents
Product specification
Low ohmic surge resistor
LSR37
FEATURES
• High pulse-loading capability
(flashes)
• Good replacement for
carbon-composite resistors.
APPLICATIONS
• 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”.
QUICK REFERENCE DATA
DESCRIPTION
VALUE
Resistance range
220
Ω to 910 Ω
1k
Ω to 10 kΩ
Resistance tolerance and series
±10%; ±20%; E12 series
Maximum dissipation at
Tamb =70 °C
0.5 W
Thermal resistance, Rth
120 K/W
Temperature coefficient
0 to +600
× 10−6/K −600 to +200 × 10−6/K
Voltage coefficient
0 to +350
× 10−6/K
±50 × 10−6/V
Maximum permissible voltage
Dielectric withstanding voltage
of the insulation for 1 minute
700 V
Basic specifications
IEC 60115-1B
Climatic category (IEC 60068)
55/155/56
Stability after:
load (1000 hours)
∆R/R max.: ±3% + 0.1 Ω
climatic test
∆R/R max.: ±3% + 0.1 Ω
soldering
∆R/R max.: ±1% + 0.1 Ω
High voltage test for
R-value
> 3.3 kΩ, 10 kV; 1 nF;
50
× 12/minutes
∆R/R max.: ±20%
(typical value
±10%)
ESD contact discharge 12 kV;
100 pulses
∆R/R max.: ±20%
(typical value:
±10%)
VP
n
R
×
=
ORDERING INFORMATION
Ordering code (12NC)
• 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.
Table 1
Ordering code as function of tolerance and packaging
TYPE
TOLERANCE
(%)
ORDERING CODE 2322 245 .....
1000 units
IN AMMOPACK
5000 units
ON REEL
LSR37
±10
12...
22...
±20
11...
21...
Table 2
Last digit of 12NC
RESISTANCE
DECADE
LAST DIGIT
220to910
Ω
1
1to9.1 k
Ω
2
10 k
Ω
3
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.
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