RF Coax Connectors
SMB Connector Specifications
Electrical Characteristics
Environmental Characteristics
Impedance — 50 ohms and 75 ohms, nominal
Frequency Range — 0 to 4.0 GHz
Voltage Rating (VRMS) —
50 ohm connectors for RG 178/U series cable
50 ohm connectors for RG 316/U series cable
75 ohm connectors for RG 179/U series cable
75 ohm connectors for RG 195/U series cable
Temperature Rating — –65°C to +165°C
Corrosion (salt spray) — MIL-STD-202, Method 101, test condition B, 5% salt
solution
Vibration High Frequency — MIL-STD-202, Method 204, test condition B
(15 G’s)
Shock — MIL-STD-202, Method 213, test condition B, 75 G’s at 6 milliseconds, 1⁄2
sine
Sea Level
70,000 Feet
300
400
300
500
75
100
75
125
Insulations Resistance — 1000 megohms min.
Contact Resistance — (milliohms max.)
Thermal Shock — MIL-STD-202, Method 107, test condition B, except high tem-
perature shall be +85°C. High temperature shall be +200°C for connectors using
200°C cables.
After
Environment
Initial
Moisture Resistance — MIL-STD-202, Method 106, when interface gasket is
used. No measurements of high humidity. Insulation resistance shall be 200
megohms minimum within five minutes after removal from humidity.
Center contact
Outer contact
Braid to body
6.0
1.0
1.0
8.0
1.5
N/A
Durability Test — Conducted per MIL-C-39012 Reg. Para. 3.15, Method Para. 4.6.12
Contact Current Rating — 1.5 amps DC max.
Voltage Standing Wave Ratio (VSWR0 —
to 4.0 GHz or 80% of upper cutoff frequency of the cable, whichever is lower.
Materials
Body, Body Components and Male Contacts — Brass, half hard, per QQ-B-626,
Alloy 360, Zinc per QQ-Z-363
Mating Engagement
Cable
Female Contacts — Beryllium copper per QQ-C-530, heat treated per MIL-H-7199
Insulators — TFE fluorocarbon per ASTM D 1710, Type 1, Grade 1
Lockwashers — Phosphor bronze per QQ-B-750
Straight
1.30 + .04F
1.25 + .04F
Right-Angle
RG 178/U Series
RG 316/U Series
1.45 + .06F
1.35 + .04F
Crimp Ferrule — Annealed copper alloy per WW-T-799
Gaskets — Silicone rubber per ZZ-R-765, Class 11B, Grade 65-75
F=GHz, does not apply to 75 ohm connectors.
RF High Potential Withstanding Voltage
Frequency — 5 MHZ
Leakage Current — N/A
50 ohm connectors for RG 178/U series cable
50 ohm connectors for RG 316/U series cable
75 ohm connectors for RG 179/U series cable
75 ohm connectors for RG 195/U series cable
Plating
Center Contacts — 0.00127 [.000050] min. Gold per MIL-G-452048 Type 1,
Grade C, Class 1, over 0.00254 [.000100] min. nickel per QQ-N-290
Other Metal Parts — Gold, Nickel or Solder plated to meet the Finish and
Corrosion requirements of MIL-C-39012
675 VRMS
950 VRMS
950 VRMS
1225 VRMS
RF Leakage — –55 dB min. at 2-3 GHz
Insertion Loss — .30dB max. at 3 GHz
Mechanical Characteristics
Engagement Forces — 14 lbs. [62.3 N] maximum engagement initially.
After 500 matings, 14 lbs. [62.3 N] maximum engagement and 2 lbs. [8.8 N] minimum
disengagement for all of SMBs.
Cable Attachment —
Straight Connectors — Crimp, both center contact and braid
Right-Angle Connectors — Crimp on braid and bifurcated solder center contact
Durability — 500 cycles per MIL-C-39012
Contact Captivation — When captivated, the contacts will withstand 4.0 lbs.
minimum axial force.
Cable Retention — When properly assembled to the compatible braided coaxial
cable, the retention is equal to the breaking strength of the cable.
Marking — Per MIL-STD-130
177
Catalog 1307191
Revised 3-07
Dimensions are in millimeters
and inches unless otherwise
specified. Values in brackets
are standard equivalents.
Dimensions are shown for
reference purposes only.
Specifications subject
to change.
USA: 1-800-522-6752
South America: 55-11-2103-6000
Hong Kong: 852-2735-1628
Japan: 81-44-844-8013
Canada: 1-905-470-4425
Mexico: 01-800-733-8926
C. America: 52-55-1106-0803
www.tycoelectronics.com
UK: 44-8706-080-208
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