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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
www.DataSheet4U.com
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 kΩ, 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 kΩ to 10 kΩ 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 Pn × 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... 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 Ω 1 to 9.1 kΩ 10 kΩ
2002 Sep 26
2
BCcomponents
Product specification
www.DataSheet4U.com
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 kΩ 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 × 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
BCcomponents
Product specification
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Low ohmic surge resistor
PULSE LOADING CAPABILITY
LSR37
104 ˆ max P (W) 103
CCB944
102
10
1 10−6
10−5
10−4
10−3
10−2
10−1 ti (s)
1
Fig.2
ˆ 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
BCcomponents
Product specification
www.DataSheet4U.com
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
BCcomponents
Product specification
www.DataSheet4U.com
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 indicati.