ALFR-2 Datasheet, PDF (1/2 Pages) Welwyn Components Limited – Telecommunications Line Feed Resistors

Telecommunications
Line Feed Resistors
Welwyn Components
ALFR-2 Series
• Meets all test and specifications of
GR-1089 & UL-1459
• Resistance IR8 to 1K6
• Tolerance down to 1%
• Withstands lightning surges
• Flameproof inorganic construction
• Auto-insertable, small size
• Meets FCC, EIA and UL requirements
• UL-497A approved
Electrical Data
Power rating
Temperature coefficient
Tolerance
Load life (1000 hours)
Temperature cycling
Short time overload (5 x RW for 10 sec.)
Moisture load
Resistance range
Lightning surge (1000 V-10/1000 µsec)
25 negative & 25 positive surges (2 minute intervals)
watts
ppm/°C
%
∆R%
∆R%
∆R%
∆R%
ohms
∆R%
Maximum
2
50
1, 5
1
1
1
1
IR8 to 1K6
2
The standard ALFR-2 contains a 128°C thermal fuse. For faster fusing characteristics a 110°C fuse is available.
Physical Data
Dimensions (Inches)
L
W
A
1.045 0.450 0.025
±0.020 ±0.020 Typ.
B
0.100
±0.015
C
0.125
±0.020
T
0.030
E
0.150
0.020
F
0.070
Typ.
G
0.138
±0.020
H
0.265
±0.020
K
0.700
±0.015
L1
0.900
±0.015
D1Ø
0.023
Dia.
D2Ø
0.032
Dia.
L
1
W
12
T
34
C
E
A
B
K
F
L₁
G
H
D₁
D₂
The four (4) terminal leads shall be in line to a tolerance to
±0.015 inch. The lead spacing dimensions as specified, shall
be measured from the tip of the lead to the top of the lead.
The leads may have a 15° draft relative to the protector body.
In circuit applications terminal leads 1 and 2 shall be
connected together externally and leads 3 and 4 used for
connection of the device. For proper performance and
reduction of safety hazards the current flow should be from
lead 3 to 4.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability.
All information is subject to Welwyn’s own data and is considered accurate at time of going to print.
© Welwyn Components Limited · Bedlington, Northumberland NE22 7AA, UK
Telephone: [phone] · Facsimile: [phone] · Email: [e-mail] · Website: www.welwyn-tt.com
A subsidiary of
TT electronics plc
Issue B · 03.02
117