RESISTORSꢀCAPACITORSꢀCOILSꢀDELAY LINES
FAILSAFE FUSIBLE WIREWOUND RESISTORS
Term.W is
RoHS
LF2 SERIES
compliant
& 260°C
RoHS
compatible
FEATURES
ꢀ Industry’s widest range!
ꢀ Withstands lightning surges and power crosses
ꢀ Resistance range: 0.01Ω to 10KΩ
RCD type LF2 is designed to provide circuit protection for
telecom applications, such as line feed, ADSL, HDSL, and
switching networks, as well as snubber circuits, switching
regulators, power faults, etc. The LF2 is a combination power
resistor and isolated thermal fuse housed in a ceramic case.
The combination enables the device to withstand short-time
overloads (various lightning surges, AC power crosses, inrush
currents, and ESD pulses), yet open safely under extended
overload conditions. The all-welded internal construction
combined with highest grade materials ensures utmost
performance and reliability. For even greater protection under
power cross conditions, as required by TR1089, specify LF2A.
ꢀ LF2 1Ω to 1.6K meets UL497A, Bellcore GR1089, ITU-T K.20
ꢀ LF2A meets Bellcore TR1089 specifications
ꢀ Standard tolerance: ±1% or ±5% (available to ±0.01%)
ꢀ Available on RCD’s exclusive SWIFT TM delivery program!
OPTIONS
ꢀ Option A: TR1089 performance
ꢀ Option X: Non-inductive (0.2µH max ≤50Ω, 0.37µH >50Ω)
ꢀ Option ER: 100 Hour Burn-In
ꢀ Customized fusing characteristics
ꢀ Matched pairs or groups
←
A
→
HOW TO USE LF2
|
C
|
→
←
↑
B
Pin #1 and #2 shall be shorted
together by the user on the PCB.
The LF2 resistor is connected
↓
↓
D
↑
1 2
3 4
.032” Pin 1 & 4,
.023” Pin 2 & 3
E
F
→ ←
into the circuit via pins #3 and #4.
1 2
3 4
DIMENSIONS Inch [mm]
RCD
Type
Wattage
@ 25°C
Resistance
Range
A
B
C
D
E
F
1.045±.02
[26.5±.5]
.450±.02
.265±.02
[6.73±.5]
.125 Min.
[3.17±.5]
.700±.015
[17.78±.4]
.900±.015
[22.86±.4]
LF2
2.0 W
0.01Ω - 10KΩ
[11.43±.5]
* LF2A resistance range is 1.8Ω to 100Ω
TYPICAL PERFORMANCE CHARACTERISTICS
APPLICATION NOTES:
Failsafe surge resistors are often tailored to particular customer
requirements. Consultation with RCD’s Engineering department is
recommended on all applications to ensure optimum performance
at the most cost-effective price. Depending on the application,
Series LF2 or LF2A can often satisfy the requirements of UL497A,
UL1950, UL1459, FCC Part 68, REA 397 & PE60, Bellcore
GR1089 & TR1089, ITU-T K.20 & K.21, VDE 0750, IEC 1000-4,
CCITT K17, IEEE 472 &587,ANSI C37.90 & C62.41, SAE J1113,
MIL-STD-704, MIL-STD-1399, & MIL-STD-1275.
Wattage Derating
21mW/°C >25°C
Load Life (1000 hours)
Moisture Resistance
Temperature Cycling
Short Time Overload
±0.5%
±1%
±0.5% (-55 to +120°C)
±0.2%(10W, 5 Sec)
Lightning Surge Capability
LF2 5.6Ω -10K
10µSx1000µS 1KV/100A peak, 10Ω
source, 50 pulses x 60S rep (peak
voltages up to 10KV avail.)
LF2A 1.8 -100Ω
Temperature Coefficient
.10Ω to .99Ω
1Ω and above
Standard Optional
90ppm 10,20,30,50
50ppm 10,20,30
LF2
- 1001 - F B
W
P/N DESIGNATION:
-55°C to +120°C std (may be higher or
lower on custom designs depending
on fuse rating)
RCD Type
Operating Temperature
Flammability
Options: X, ER, A
(leave blank for standard)
UL 94V-0, EC 695-2-2
Resis.Code 1%: 3 signif. figures & multiplier,
(R100=.1Ω,1R00=1Ω,10R0=10Ω,1000=100Ω, 1001=1K, etc)
Resis.Code 2%-10%: 2 signif. figures & multiplier,
(R10=0.1Ω, 1R0=1Ω, 100=10Ω, 101=100Ω, 102=1K, etc)
100W
50W
30W
Tolerance Code: J=5%, H=3%, G=2%, F=1%
Packaging: B = Bulk (standard)
Fusing Characteristics
10W
Optional Temp. Coefficient (leave blank for standard):
5=5ppm, 10 = 10ppm, 20 = 20ppm, etc.
3W
10 20 30 50 100 200 300 500
Termination: W=Pb-free, Q=Sn/Pb (leave blank if either is acceptable)
LF2FusingRange(Seconds,Typ.)
-
-
-
-
RCD Components Inc, 520 E.Industrial Park Dr, Manchester, NH, USA 03109 rcdcomponents.com Tel: 603 669 0054 Fax: 603 669 5455 Email:sales@rcdcomponents.com
FA023B Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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