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SMK - 50 Ohm Connectors
(2.92mm)
INCHES (MILLIMETERS) ? CUSTOMER DRAWINGS AVAILABLE ON REQUEST
ELECTRICAL RATINGS
FIELD REPLACEABLE APPLICATION NOTES
Impedance: 50 ohms
These field replaceable connectors are easy to install and replace. The
Frequency Range: 0-40 GHz
hermetic seal is mounted into the circuit module wall and the connector
VSWR: (f = GHz)
can be removed and replaced without destroying the hermeticity of the
Semi-Rigid straight cabled connectors and adapters ............. 1.20 Max
Field replaceable ( see typical return loss graph) ............................ N/A
Working Voltage: (VRMS maximum)
Connectors for Cable Type Sea Level 70K Feet
.086 Semi-Rigid and field replaceable ....................... 335 85
.141 Semi-Rigid and adapters ................................... 500 125
Dielectric Withstanding Voltage: (VRMS minimum at sea level)
.086 Semi-Rigid and field replaceable ........................................... 1000
.141 Semi-Rigid and adapters ....................................................... 1500
circuit housing.
The field replaceable connector creates a transition from microstrip
circuitry to a coaxial transmission line. The SMK (2.92mm) seal pin
diameter is .012 (.030) to minimize the capacitive effects on the circuit
trace. For optimum electrical performance, the transition from the
hermetic seal to the microstrip trace must be properly compensated
which involves adjusting the microstrip trace width to minimize any
impedance discontinuities found in the transition area.
Corona Level: (Volts minimum at 70,000 feet)
The plot shown below is representative of the typical return loss of a
.086 Semi-Rigid and field replaceable ............................................. 250
.141 Semi-Rigid and adapters ......................................................... 375
Johnson field replaceable SMK connector. To produce the data shown
below, a test fixture is created using the Johnson SMK hermetic seal.
Insertion Loss: (dB maximum)
The fixture consists of a suitably thick spacer plate with the hermetic
Adapters ................................................ 0.06 f (GHz), tested at 6 GHz
seal mounted flush to both surfaces. Two connectors are mounted back
Straight Semi-Rigid cable connectors ..... 0.03 f (GHz), tested at 10 GHz
Insulation Resistance: 5000 megohms minimum
Contact Resistance: (milliohms maximum) Initial After Environmental
Center contact straight cabled connectors ... 3.0* 4.0
Center contact adapters ................................ 4.0 6.0
Field replaceable connectors ......................... 6.0 8.0
to back around the fixture and the VSWR of this test assembly is
measured. The calculated return loss trace shown is equivalent to the
square root of the measured VSWR of the test assembly. Since the
connectors tested are of identical design, it can be stated with fair
accuracy that the calculated data shown represents the response of a
single field replaceable connector and its transition to the hermetic seal.
Outer contact (all connectors) ....................... 2.0 N/A
Body to cable (gold plated connectors) ......... 0.5 N/A
Body to cable (passivated connectors) .......... 5.0 N/A
RF Leakage: (dB minimum, tested at 2.5 GHz) ............................. -90dB
RF High Potential Withstanding Voltage:
(VRMS minimum, tested at 4 and 7 MHz) =
.086 Semi-Rigid and field replaceable ............................................ 670
.141 Semi-Rigid and adapters ...................................................... 1000
Although we do not publish a VSWR specification for field replaceable
connectors, typical connector return loss can be expected to be better
than 20 dB through 40 GHz. A VSWR specification is not stated because
an industry standard method for testing field replaceable connectors
does not exist. The actual performance of the connector is dependent
upon the following:
1. For optimum electrical performance, we recommend the use of our
standard 142-1000-033 hermetic seal with a pin diameter of .0120
ENVIRONMENTAL RATINGS
(0.305) +/- .0005 (0.013).
(Meets or exceeds the applicable paragraph of MIL-C-39012)
2. It is recommended that the hermetic seal be mounted flush with the
Temperature Range: - 65 ° C to + 165 ° C
circuit housing. Tolerance variations between the hermetic seal and
Thermal Shock: MIL-STD-202, Method 107, Condition B
machined housing do not always guarantee an optimum transition to
Corrosion: MIL-STD-202, Method 101, Condition B
the connector. Some manufacturers recommend an additional
Shock: MIL-STD-202, Method 213, Condition I
counterbore in the circuit housing to accommodate a solder washer
Vibration: MIL-STD-202, Method 204, Condition D
during installation of the seal. We do not recommend this type of
Moisture Resistance: MIL-STD-202, Method 106
installation because, if the counterbore is not completely filled with
solder, electrical discontinuities may be created.
3. The transition between the hermetic seal pin and the microstrip trace
will effect electrical performance, as stated above. Several different
methods of hermetic seal mounting and seal pin to microstrip trace
FIELD REPLACEABLE TEST ASSEMBLY
attachment are used in the industry.
34
Connectivity Solutions
Tel: 800-247-8256 ? Fax: 507-833-6287 ? www.EmersonNetworkPower.com/connectivity
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