Telecommunications
Line Feed Resistors
Telecommunications
FOR NEW DESIGNS
ALFR-2B Series
NOT RECOMMENDED
Line Feed Resistors
·
1% tolerance
OBSOLETE
·
Auto-insertable, small size
ALFR-2B Series
·
Withstands lightning surges
•
4.8 ohm
·
1% tolerance
to
small size
range
1600 ohm
•
Auto-insertable,
·
Withstands
safely under power cross
•
Opens
lightning surges
•
Flameproof inorganic
·
4.8 ohm to 1600 ohm range
construction
•
·
Opens safely under
and specifications of GR-1089 & UL-497A
Meets all test
power cross
•
construction
·
Flameproof inorganic
EIA requirements
& UL-497A
Meets
test and specifications of GR-1089
FCC and
•
Meets all
•
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
All information is subject
General Note
to IRC’s own data and is considered accurate at time of going to print.
IRC reserves the right to make changes in product specification without notice or liability.
TT electronics reserves the right to make changes in product specification without notice or liability.
Wire and Film Technologies Division
• 4222 South Staples Street • Corpus Christi Texas 78411 USA
All information
7900 • Facsimile:
TT electronics’ own
www.irctt.com
considered accurate at time of going to print.
Telephone: 361 992
is subject to
361 992 3377 • Website:
data and is
A subsidiary of
TT electronics plc
www.bitechnologies.com
ALFR-2B Series Issue
www.welwyn-tt.com
www.irctt.com
October 2008 Sheet 1 of 2
© TT electronics plc
2.14
Telecommunications
Line Feed Resistors
Telecommunications
Line
Series
Resistors
Feed
ALFR-2B
OBSOLETE
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.
Physical Data
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
General Note
TT electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT electronics’ own data and is considered accurate at time of going to print.
www.bitechnologies.com www.irctt.com www.welwyn-tt.com
© TT electronics plc
2.14
PCB Design
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