SMK - 50 Ohm Connectors (2.92mm) INCHES (MILLIMETERS) • Jack Receptacle - Thread Mount Field Replaceable ACCEPTS PIN SIZE GOLD PLATED PASSIVATED .0120 +/- .0005 (0.305 +/- .013) 145-0701-001 145-0701-002 Mounting Hole Layout MATERIAL SPECIFICATIONS Mating Engagement for SMK (2.92mm) Series per MIL-STD-348 Bodies: Stainless steel per QQ-B-626, gold plated* per MIL-G-45204 .00005" min. or passivated per MIL-F-14072 B (EL) 300 Contacts: Female - beryllium copper per QQ-C-530, gold plated per MIL-G-45204 .00005" min. Contact Support Beads: PTFE fluorocarbon per ASTM D 1710 and ASTM D 1457 or modified PPE resin Seal Rings: Silicone rubber per ZZ-R-765 * All gold plated parts include a .00005" min. nickel underplate barrier layer. MECHANICAL RATINGS Engagement Design: MIL-STD-348, Series SMK (2.92mm) Engagement/Disengagement Force: 2 inch-pounds maximum Mating Torque: 7 to 10 inch-pounds Coupling Proof Torque: 15 inch-pounds minimum Coupling Nut Retention: 60 pounds minimum Contact Retention: 6 lbs. minimum axial force (captivated contacts) Cable Retention: Axial Force*(lbs)Torque (in-oz) .086 semi-rigid.....................................30 16 .141 semi-rigid.....................................60 55 *Or cable breaking strength whichever is less. Durability: 500 cycles minimum Notes: 1. ID of contact shall meet VSWR and connectivity requirements when mated with dia. .0355-.0365 male pin. Emerson Network Power Connectivity Solutions 299 Johnson Avenue SW, Waseca, MN 56093 • 800 -247- 8256 • +1 (507) 833-8822 • www.EmersonConnectivity.com

SMK - 50 Ohm Connectors (2.92mm) INCHES (MILLIMETERS) • ELECTRICAL RATINGS FIELD REPLACEABLE APPLICATION NOTES Impedance: 50 ohms The field replaceable connectors manufactured by Johnson Components ™, Frequency Range: 0-40 GHz are easy to install and replace. The hermetic seal is mounted into the circuit VSWR: (f = GHz) module wall and the connector can be removed and replaced without de- Semi-rigid straight cabled connectors and adapters..............1.20 Max stroying the hermeticity of the circuit housing. Field replaceable ( see typical return loss graph)............................ N/A Working Voltage: (Vrms maximum) The field replaceable connector creates a transition from microstrip circuitry Connectors for Cable T ype Sea Level 70K Feet to a coaxial transmission line. The SMK (2.92mm) seal pin diameter is .012 .086 semi-rigid and field replaceable.........................335 85 (.030) to minimize the capacitive effects on the circuit trace. For optimum .141 semi-rigid and adapters.....................................500 125 electrical performance, the transition from the hermetic seal to the microstrip Dielectric Withstanding Voltage: (VRMS minimum at sea level) trace must be properly compensated. Compensation involves adjusting .086 semi-rigid and field replaceable.............................................1000 the microstrip trace width to minimize any impedance discontinuities found .141 semi-rigid and adapters.........................................................1500 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 Johnson .086 semi-rigid and field replaceable...............................................250 Components™ field replaceable SMK connector. To produce the data shown .141 semi-rigid and adapters...........................................................375 below, a test fixture is created using the Johnson Components ™ SMK her- Insertion Loss: (dB maximum) metic seal. The fixture consists of a suitably thick spacer plate with the Adapters................................................0.06 f (GHz), tested at 6 GHz hermetic seal mounted flush to both surfaces. Two connectors are mounted Straight semi-rigid cable connectors.......0.03 f (GHz), tested at 10 GHz back to back around the fixture and the VSWR of this test assembly is Insulation Resistance: 5000 megohms minimum measured. The calculated return loss trace shown is equivalent to the square Contact Resistance: (milliohms maximum) Initial After Environmental root of the measured VSWR of the test assembly. Since the connectors Center contact straight cabled connectors...3.0* 4.0 tested are of identical design, it can be stated with fair accuracy that the Center contact adapters................................4.0 6.0 calculated data shown represents the response of a single field replaceable Field replaceable connectors........................6.0 8.0 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 Although Johnson Components ™ does not publish a VSWR specification Body to cable (passivated connectors).........5.0 N/A for field replaceable connectors, typical connector return loss can be ex- RF Leakage: (dB minimum, tested at 2.5 GHz).............................-90dB pected to be less than -20 dB through 40 GHz. A VSWR specification is not RF High Potential Withstanding Voltage: (Vrms minimum, tested at 4 stated because an industry standard method for testing field replaceable and 7 MHz) = connectors does not exist. The actual performance of the connector is .086 semi-rigid and field replaceable..............................................670 dependent upon the following: .141 semi-rigid and adapters........................................................1000 1.For optimum electrical performance, Johnson Components ™ recommends the use of our standard 142-1000-033 hermetic seal with a pin diameter ENVIRONMENTAL RATINGS of .0120 (0.305) +/- .0005 (0.013). (Meets or exceed the applicable paragraph of MIL-C-39012) 2.It is recommended that the hermetic seal be mounted flush with the cir- Temperature Range: - 65°C to + 165 °C cuit housing. Tolerance variations between the hermetic seal and ma- Thermal Shock: MIL-STD-202, Method 107, Condition B chined housing do not always guarantee an optimum transition to the Corrosion: MIL-STD-202, Method 101, Condition B connector. Some manufacturers recommend an additional counterbore Shock: MIL-STD-202, Method 213, Condition I in the circuit housing to accommodate a solder washer during installation Vibration: MIL-STD-202, Method 204, Condition D of the seal. Johnson Components ™ does 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 meth- ods of hermetic seal mounting and seal pin to microstrip trace attach- FIELD REPLACEABLE TEST ASSEMBLY ment are used in the industry. Emerson Network Power Connectivity Solutions 299 Johnson Avenue SW, Waseca, MN 56093 • 800 -247- 8256 • +1 (507) 833-8822 • www.EmersonConnectivity.com

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