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Thick film technology
Bourns patented thermal fuse
Fail safe
Protection to ITU-T K.20
Analog Line Cards
CPE (Customer Premises Equipment)
DDS (Digital Data Systems)
DLC (Digital Loop Carriers)
T1/T3 Transmission Lines
ISDN
L21
Line Feed Resistors w/Thermal Fuse
Product Characteristics
Resistor Tolerance
20 ohms to 100 ohms .....................................................鹵1 %
5.6 ohms .........................................................................鹵5 %
Ratio Tolerance
20 ohms to 100 ohms ..................................................鹵0.5 %
5.6 ohms ......................................................................鹵2.5 %
Operating Temperature.......................................-40 擄C to +85 擄C
Environmental Characteristics
TESTS PER MIL-STD-202
Humidity ..........................................................................103B
Solderability.....................................................................208D
Thermal Shock ................................................................107B
Resistance to Solvents ......................................................215
Resistance to Solder Heat ..............................................210D
Flammability ...................................................................UL 94V-0
IEC 695-2-2
Functional Characteristics
ITU-T K.20
Lightning Surge ................................................................1 KV
Power Induction........................................................600 Vrms
Power Contact..........................................................230 Vrms
UL 497A
Physical Characteristics
Body Style ..........................................................Open Frame SIP
Body Material...........................................................96% Alumina
Lead Frame Material..................................Copper, solder coated
Standard Parts Available Off the Shelf
........................................................5.6, 20, 30, 50, 100 ohms
How To Order
2.54
(.100)
2.54
(.100)
TYP.
2 PLCS.
3.18
MAX. THICKNESS
(.125)
Circuit Schematic
R1
F1
R2
F2
1
2
4
6
8
9
Product Dimensions
MAX. SEATED
HEIGHT
12.32
(0.485)
25.75
MAX.
(1.010)
0.84
REF.
(.033)
5.08
(.200)
TYP.
3 PLCS.
3.175 + 0.64/-0.13
(.125 + .025/-.005)
0.51 鹵0.25
THICK
(.020 x .010)
0.81
DIA. HOLE
(.032)
L21 A100AA
Model
(L21 = LFR w/Thermal Fuse)
Resistor Tolerance
鈥?A5R6AA = 5.6 ohms
鈥?A020AA = 20 ohms
鈥?A030AA = 30 ohms
鈥?A050AA = 50 ohms
鈥?A100AA = 100 ohms
Custom values available; contact factory.
DIMENSIONS:
MM
(INCHES)
Circuit Protection Division
Asia-Pacific:
Tel: +886-2 2562-4117
Fax: +886-2 2562-4116
Europe:
Tel: +41-41 768 5555
Fax: +41-41 768 5510
The Americas:
Tel: +1-951 781-5500
Fax: +1-951 781-5700
www.bourns.com
REV. A 06/05
Specifications are subject to change without notice.
Customers should verify device performance in their specific applications.
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