Telecommunications
Line Feed Resistors
ALFR-2B Series
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1% tolerance
Auto-insertable, small size
Withstands lightning surges
4.8 ohm to 1600 ohm range
Opens safely under power cross
Flameproof inorganic construction
Meets all test and specifications of GR-1089 & UL-497A
Meets FCC and EIA requirements and is UL-497A approved
Environmental Data
Characteristics
Wattage
Temperature Coefficient
Tolerance
Load Life (1000 hours)
Temperature Cycling
Short Time Overload (5x RW for 10 sec.)
Moisture Load
Resistance Range
Lightning Surge (1000V-10/1000µsec.)
25 negative & 25 positive surges (2 minute intervals)
Limits-ALFR-2B
2 watts
50 ppm/°C
1% and 5%
1%∆R maximum
1%∆R maximum
1%∆R maximum
1%∆R maximum
4.8 to 1600 ohms
No failures
DESIGN & CONSTRUCTION:
The Line Feed Resistor is a tight tolerance, stable resistor which has the additional capability to withstand both in rush currents
and certain lightning pulse surges but would fuse safely when exposed to overload conditions such as the 600 volt power cross
specified in GR-1089.
General Note
IRC reserves the right to make changes in product specification without notice or liability.
All information is subject to IRC’s own data and is considered accurate at time of going to print.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
A subsidiary of
TT electronics plc
ALFR-2B Series Issue October 2008 Sheet 1 of 2
Telecommunications
Line Feed Resistors
Physical Data
The four (4) terminal leads shall be in the line
to a tolerance to ±0.015 inch. The lead spacing
dimensions as specified, shall be measures from
the tip of the lead. The leads may have a 15° draft
relative to the protector body.
1.045 ± 0.020
0.030 Meniscus Permitted
0.450 ± 0.020
0.125 ± 0.020
0.150 ± 0.020
0.025
0.100 ± 0.015
1
2
0.700 ± 0.015
0.900 ± 0.015
3
0.070 Typ.
0.265 ± 0.020
0.138 ± 0.020
0.021 Lead Dia.
0.032 Lead Dia.
Ordering Data
Sample Part No.
IRC Type
ALFR
ALFR - 2B
1000
F
Power
2B = 2 watts
Resistance Value
Tolerance
F = ±1%, J = ±5%
How to use the ALFR-2B:
Leads 1 & 2 can be interchanged with leads 3 & 4. The part can then
be inserted into the circuit in either orientation.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com
ALFR-2B Series Issue October 2008 Sheet 2 of 2
RF/Wirelessly
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