SMA to MMCX Cables
MMCX to SMA Cables & Adapters
An SMA connector can be securely and reliably connected to a PCB-mounted MMCX adapter using an SMA to MMCX pigtail adapter. This useful radio frequency component provides between-series connectivity and an advantageous step-down in size that enables devices to use a compact microminiature connector within devices, and a larger, subminiature external connector that can be easily handled.
These pigtails use an LMR 100 analog that has an exceptionally low attenuation rate and high flexibility. To minimize signal loss and the risk of damage or crowding of sensitive components, pigtail adapters should be kept as short as possible.
Applications of include:
- Computer peripheral devices
- Cellular networking end-user devices
- Wireless internet TV
- External GPS antennas
- Wireless audio
- In-ear monitors
- GPS and PDA receivers
- Wi-Fi mini PCI cards
- Video transmitters for First Person View
SMA connector - Characteristics
The SMA connector is a widely-used, threaded subminiature connector. The male and female counterparts of this connector are securely mated by screw coupling for a weatherproof seal that is rated for 500+ mating cycles.
Physical specifications of the SMA connector
- Dimensions: the male connector's diameter is 7⁄16 inches (11 mm) and the female connector's diameter is 3⁄8 in (9.5 mm)
- Threading: 36 threads per inch
- Material: gold or nickel-plated machined brass with a Teflon insulator
- Male SMA connector: cylindrical body with outer hex-nut and internalized threads. Center pin conductor.
- Female SMA connector: barrel-shaped body with externalized threads, inner beryllium copper receptacle, and silicone rubber gasket.
Electrical specifications of the SMA connector.
- Nominal impedance: 50 ohms
- Frequency range: 0 to 18 GHz
- Voltage rating: 500 volts.
- VSWR: 1.05 to 1.15
- Contact resistance: 2.0 milliohms.
- Insertion resistance: 5000 megaohms.
- Signal leakage: -90dB max (at 2 to 3 GHz)
MMCX connector Specifications
The Micro-Miniature Coaxial Connector (MMCX) is a micro-miniature version of the MCX radio frequency connector. Its small size and weight make it useful in component-dense applications that require a low-footprint connector.
MMCX connector physical features
- EU specification CECC 22000
- MMCX plug and jack diameter of 2.4 millimeters (0.09 inches)
- Mated height of 5.2mm
- Snap-on mating mechanism: snap ring carried by the male (plug) MMCX connector
- Force required to engage and disengage the connector: 6 Newtons maximum
- Center contact retention:10 Newtons.
- 360-degree rotation of the mated connector around its axis.
- MMCX jack and plug are made from brass with a Teflon insulator
- Male MMCX connector: gold-plated brass center pin
- Female MMCX connector: gold-plated complimentary beryllium copper receptacle.
Electrical characteristics of the MMCX connector
- Broadband radio frequency connector
- Maximum frequency: up to 6 GHz
- Nominal impedance: 50 Ohms.
- Max voltage: 170 Volts
- VSWR: 1.25:1 at 6 GHz
- Insulation resistance: 1,000 Megohms.
- Dielectric withstanding voltage of the connector is 500 Volts.
- Contact resistance: 5 milliohms
- RF leakage for the MMCX connector: -60 dB at 2.5 GHz.