FAILSAFE FUSIBLE WIREWOUND RESISTORS
RESISTORS CAPACITORS COILS DELAY LINES
LF2 SERIES
RoHS
Term.W is
RoHS
compliant
& 260°C
compatible
FEATURES
Industry’s widest range!
Withstands lightning surges and power crosses
Resistance range: 0.01Ω to 10KΩ
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!
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.
HOW TO USE LF2
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
←
↑
B
1 2
A
→
→
|
C
|
←
E
F
3 4
D
↑
Pin 1 & 4,
→ ←
.032” Pin 2 & 3
.023”
RCD
Type
LF 2
Wattage
@ 25°C
2.0 W
R esistance
R an g e
0.01
Ω
- 10K
Ω∗
* LF2A resistance range is 1.8Ω to 100Ω
TYPICAL PERFORMANCE CHARACTERISTICS
Wattage Derating
Load Life (1000 hours)
Moisture Resistance
Temperature Cycling
Short Time Overload
Lightning Surge Capability
LF2 5.6
Ω
-10K
LF2A 1.8 -100
Ω
Temperature Coefficient
.10
Ω
to .99
Ω
1Ω and above
Operating Temperature
Flammability
21mW/°C >25°C
±0.5%
±1%
±0.5% (-55 to +120°C)
±0.2%(10W, 5 Sec)
10µSx1000µS 1KV/100A peak, 10
Ω
source, 50 pulses x 60S rep (peak
voltages up to 10KV avail.)
Standard Optional
90ppm 10,20,30,50
50ppm 10,20,30
-55°C to +120°C std (may be higher or
lower on custom designs depending
on fuse rating)
UL 94V-0, EC 695-2-2
100W
50W
30W
Fusing Characteristics
10W
3W
LF2 Fusing Range (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
83
FA023B
Sale of this product is in accordance with GF-061. Specifications subject to change without notice.
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Power (Watts)
10
20 30 50 100 200 300 500
○
○
○
↓
↓
1 2
3 4
Pin #1 and #2 shall be shorted
together by the user on the PCB.
The LF2 resistor is connected
into the circuit via pins #3 and #4.
D IME N S ION S Inch [mm]
A
1.045±.02
[26.5±.5]
B
.450±.02
[11.43±.5]
C
.265±.02
[6.73±.5]
D
.125 Mi n.
[3.17±.5]
E
.700±.015
[17.78±.4]
F
.900±.015
[22.86±.4]
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.
P/N DESIGNATION:
RCD Type
Options:
X, ER, A
(leave blank for standard)
LF2
- 1001 -
F B
W
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)
Tolerance Code:
J=5%, H=3%, G=2%, F=1%
Packaging:
B = Bulk (standard)
Optional Temp. Coefficient
(leave blank for standard):
5=5ppm, 10 = 10ppm, 20 = 20ppm, etc.
Termination:
W=Pb-free, Q=Sn/Pb (leave blank if either is acceptable)
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