Features
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Over-voltage/lightning protection to
Bellcore GR-1089 & ITU-T K.20
Standard “off the shelf” designs
Typical application is secondary
protection on telecom line cards
Custom versions available, including
SMD solutions and fuse technology
(contact factory)
4B04B - Thick Film Surge Resistor Networks
4B04B-501 (Pair of Matched Resistors)
Product Characteristics
Resistance Values ......................................................20Ω - 100Ω
Resistance Tolerance ............................................................±1%
TCR.............................................................................100ppm/°C
Ratio Tolerance..............................................>34Ω............±0.5%
..............................................<34Ω...............±1%
Power Dissipation (per resistor) @ 25ºC ..................................2W
Temperature Range ............................................-55ºC to +125ºC
Environmental Characteristics
TESTS PER MIL-STD-202 ..............................................∆R MAX.
Resistance to Solvents .........................No Marking Deterioration
Resistance to Solder Heat....................................±0.5% or 0.5Ω,
whichever is greater
Solderability ........................................................>95% Coverage
Insulation Resistance ..........................10 MΩ min. (isolated pins)
Bias Humidity Test ..........................................50V/85% RH/85°C
Functional Characteristics
Lightning Surge Test
Bellcore Spec GR-1089
4B04B-502 (Resistor with Thermal Fuse)
Product Characteristics
Resistance Values.....................................................5.6Ω - 100Ω
Resistance Tolerance......................1% (optional), 5% (standard)
TCR ...................................................................800 ±200ppm/°C
Power Dissipation @ 25ºC.......................................................2W
Temperature Range............................................-55ºC to +125ºC
Functional Characteristics
Lightning Surge Test
Bellcore Spec GR-1089
10 x 1000
µsec
..................1 kV
2 x 10
µsec
.....................2.5 kV
Power Cross Test ............................................Per Bellcore spec.
(Vrms applied vary with resistance values)
Physical Characteristics
Body Style ..........................................................Open Frame SIP
Body Material ..........................................................96% Alumina
Lead Frame Material .................................Copper, solder coated
Standard Parts Available Off the Shelf ................5.6Ω, 10Ω, 34Ω
10 x 1000
µsec
.................1 kV
2 x 10
µsec
....................2.5 kV
ITU-T K.20
10 x 700
µsec
...................2 kV
Power Cross Test .............................................Per Bellcore spec.
(Vrms applied vary with resistance values)
Physical Characteristics
Body Style ..........................................................Open Frame SIP
Body Material...........................................................96% Alumina
Lead Frame Material..................................Copper, solder coated
Standard Parts Available Off the Shelf ........................50Ω, 100Ω
50.80
(2.000)
MAX.
11.30
(0.445)
25.40±.50
(1.000±.020)
3.05 Max.
(.120 Max.)
2.54±.127
(.100±.005)
1
2
17.78±.254
(0.700±.010)
3
4
2.54±.127
(.100±.005)
1.40 Max. TYP.
(.055 Max.)
12.70
MAX.
(0.500)
2.29 Max.
(.090 Max.)
0.36 Max.
(.014 Max.)
Functional Schematic
Governing dimensions are in mm.
Dimensions in parenthesis are inches
and are approximate.
User must short pins 3 & 4 on the circuit board
15.24
TYP.
(0.600)
1
15.24
(0.600)
15.24
7 (0.600)
13
15.24
(0.600)
19
0.36 Max.
(.014 Max.)
How To Order
How To Order
4B 04 B - 50X - XXX
Model
(4B = Open Frame)
Number of Pins
Physical Configuration
Electrical Configuration
• 501 = Pair of Matched Resistors
Resistance Code
• First 2 digits are significant
• Third digit represents the
number of zeros to follow
Model
(4B = Open Frame)
Number of Pins
Physical Configuration
4B 04 B - 50X - XXX J
Electrical Configuration
• 502 = Resistor with Thermal Fuse
Resistance Code
• First 2 digits are significant
• Third digit represents the
number of zeros to follow
5% tolerance
S ecifications are s bject to change itho t notice
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