MMCX Cable Assembly Manufacturing for Australia
Custom MMCX cable assemblies for antennas, GPS modules, wireless devices, portable instruments, IoT hardware, and compact RF systems where low profile, 50 ohm shielding, and controlled routing matter.
Why Engineers Specify MMCX When RF Packaging Gets Tight
MMCX is not just a smaller version of SMA. It is chosen when a product needs a compact coaxial RF connectorwith fast snap-on mating and the ability to rotate after installation. That makes it useful in embedded wireless products, GPS hardware, compact instruments, and antenna-fed systems where enclosure space and cable routing are constrained.
The cable assembly still has to behave like a controlled RF path. Performance depends on impedance continuity, shield treatment, connector attachment quality, and how the miniature cable is supported inside the product. Once the interconnect is electrically short enough to matter, the assembly starts acting like a transmission line, which is why compact RF builds need more discipline than general low-speed wiring.
On this site we already cover connector families in the RF connector types guideand system-level validation in the high-speed cable signal integrity guide. This capability page focuses on buying, specifying, and manufacturing MMCX cable assemblies for repeat OEM use.
Why Buyers Choose a Dedicated MMCX Cable Assembly Supplier
MMCX looks simple on paper, but miniature RF builds are unforgiving once packaging, shielding, and repeatability are involved.
Made for Compact Wireless Hardware
MMCX is selected when the product cannot spare the size of a larger threaded connector but still needs a shielded RF path that is easier to mate than ultra-miniature board connectors.
Rotational Interface Helps with Tight Routing
The MMCX coupling style allows rotation after mating, which can reduce cable twist stress in products where the connector must fit into cramped or awkward mechanical layouts.
Controlled RF Shielding Through the Transition
Compact RF assemblies fail at the transition first, not in the bulk cable. We build around shield continuity, connector fit, and termination control so the interconnect performs like a system instead of a generic wire.
Cable Choice Matched to Loss and Bend Space
Miniature RF leads are a tradeoff between attenuation, flexibility, diameter, and serviceability. We help define the right cable rather than defaulting to the smallest option on the shelf.
Prototype, Replacement, and Production Support
We support sample-based reverse engineering, first articles, and controlled repeat supply for imported electronics, private-label products, and OEM redesigns.
Inspection Aligned to Signal Risk
Finished MMCX assemblies can be checked to agreed workmanship, continuity, and RF acceptance requirements so incoming inspection knows exactly what the build has passed.
Technical Range
| Connector Interface | MMCX snap-on micro RF connector with compact footprint and rotational mating capability |
|---|---|
| Impedance | Typically 50 ohms for compact RF, antenna, GPS, telemetry, and embedded wireless systems |
| Typical Frequency Use | Often used from DC up to around 6 GHz depending on connector family, cable, and assembly geometry |
| Cable Families | Miniature coax, micro coax, and other compact RF cable constructions selected around routing and loss targets |
| Assembly Styles | MMCX to MMCX, MMCX to SMA, bulkhead transitions, pigtails, internal antenna leads, and custom mixed-end builds |
| Mechanical Focus | Tight bend-space review, connector retention, strain relief, and controlled routing in compact housings |
| Validation Options | Continuity, pinout, workmanship inspection, retention checks, and RF performance validation where specified |
| Production Scale | Prototype quantities through repeat OEM supply with revision-controlled documentation |
Specification Checklist Before RFQ
- Define whether the product needs MMCX for space, rotational freedom, or both. That decision affects whether SMA, MCX, or another interface may be more practical.
- Confirm cable outside diameter and bend space early because small RF connectors are not tolerant of casual cable substitutions.
- State the actual frequency range, route length, and acceptable loss target together instead of requesting a generic RF pigtail.
- Document connector gender, straight versus right-angle orientation, and any bulkhead or panel interface to avoid mismatched prototypes.
- Review how the cable will be supported inside the product so vibration does not load the connector body directly.
- Separate workmanship inspection from RF validation requirements so prototype approval and incoming inspection use the same acceptance logic.
If you are still comparing RF connector formats or deciding whether the cable should be specified as a broader coax or micro-coax program, these related pages will help:
What MMCX datasheets publish, and where they differ
Sources: Amphenol RF MMCX plug-to-plug cable assemblies datasheet, Cinch Connectivity Solutions MMCX straight crimp plug datasheet (135-3402-001) and an Amphenol coax catalogue page for MMCX connectors (2003 print). The figures below are copied from those documents and were not measured by us. A dash means the figure is not stated in the document we read, not that the part has no limit. Newtons are converted from pounds-force (1 lbf = 4.448 N) and rounded.
| Parameter | Amphenol RF assembly datasheet | Cinch 135-3402-001 | Amphenol catalogue page (2003) |
|---|---|---|---|
| Frequency range | DC to 6 GHz | 0 to 6 GHz (connectors) | 0 to 6 GHz |
| VSWR limit | 1.25 max, DC to 4 GHz; 1.40 max, 4 to 6 GHz | Straight cabled: 1.20; right-angle cabled: 1.25 (RG-178, RG-316) | Straight: 1.3 max; right angle: 1.5 max |
| Mating cycles | 500 min | 500 min | 500 min |
| Engagement force | - | 8 lb max axial (about 35.6 N) | 3.4 lb max (about 15.1 N) |
| Disengagement force | - | 1.4 lb min axial (about 6.2 N) | 1.4 to 4.4 lb (about 6.2 to 19.6 N) |
| Contact retention | - | 2.0 lb min axial (about 8.9 N) | 2.3 lb min (about 10.2 N) |
| Insertion loss | - | 0.1 dB max straight, 0.2 dB max right angle, tested at 1 GHz | - |
| Operating temperature | -40 to +90 °C | -65 to +165 °C (connectors) | - |
The practical reading: the interface range (DC to 6 GHz) and the 500-cycle mating rating agree across the documents, but retention force, VSWR limit and operating temperature do not. A requirement written as simply "MMCX, 6 GHz" therefore leaves the retention force, the VSWR limit and the temperature range open. Name the connector part number and the datasheet it comes from on the drawing.
The 500-cycle figure counts connect and disconnect cycles of the connector pair. It does not describe how many times a cable can be bent or how many times a swivelling lead can be rotated; see the flex-life section below.
Cable fit: the cable group chooses the crimp part
MMCX is one interface, but the crimp plug body that fits a cable is selected by cable type. From the Cinch datasheets above, the straight crimp plug 135-3402-001 lists RG-178/U and 196 and RG-179/U and 196, and the right-angle crimp plug 135-3403-101 lists RG-316/U, 188 and 187. Amphenol RF's standard plug-to-plug assemblies in the datasheet above are built on RG-174. These cable groups are not interchangeable in one crimp body.
Cable outside diameter, braid and dielectric also differ between manufacturers of the same RG-type name, so quote with the cable manufacturer's part number and datasheet, not the RG number alone.
| Cable | Axial force (lb) | About (N) |
|---|---|---|
| .047 in flexible | 3.5 | 15.6 |
| RG-178 | 7.0 | 31.1 |
| RG-316 | 20.0 | 89.0 |
| RG-316DS | 25.0 | 111.2 |
| .086 in semi-rigid | 30.0 | 133.4 |
Datasheet note: axial force, or the cable breaking strength if that is lower. Arithmetic from these figures, not a test result: with a 1.4 lb (about 6.2 N) minimum disengagement force and 7.0 lb (about 31.1 N) cable retention on RG-178, an axial pull can release the snap before the crimp lets go. Side load and repeated bending are not covered by these numbers.
VSWR limits as return loss
Datasheets quote VSWR; test plans often quote return loss. They describe the same reflection: with V the VSWR, the reflection coefficient is |Gamma| = (V - 1) / (V + 1) and return loss is -20 log10|Gamma|, as explained in Wikipedia: Return loss and Wikipedia: Standing wave ratio. The right-hand column is computed from that formula for the limits quoted above.
| VSWR limit | Where it appears | Return loss (computed) |
|---|---|---|
| 1.20 | Cinch, straight cabled connector | 20.83 dB |
| 1.25 | Amphenol RF, DC to 4 GHz; Cinch, right-angle cabled connector | 19.08 dB |
| 1.30 | Amphenol catalogue page, straight | 17.69 dB |
| 1.40 | Amphenol RF, 4 to 6 GHz | 15.56 dB |
| 1.50 | Amphenol catalogue page, right angle | 13.98 dB |
Amphenol RF prints −19 dB beside 1.25 and −16 dB beside 1.40, which match the computed values rounded to whole dB. The Cinch datasheet also lists a maximum insertion loss of 0.1 dB for straight and 0.2 dB for right-angle cabled connectors, tested at 1 GHz; that is a connector figure, not the loss of a finished length of cable.
Strain relief: keep the load off the connector
The snap-on MMCX body is small and releases by design. The cable should not carry weight or take side load at the connector, so the support point belongs on the cable, short of the plug, with the bend taken further along. The connector then only locates the contact; the cable path is held by the product.
- Hold the cable at a defined support point (clip, adhesive pad or tie) close behind the plug, so vibration and cable weight go into the housing.
- Take the first bend after the support point, at no tighter than the cable manufacturer's minimum bend radius from its datasheet.
- Leave a small service loop if the lead is mated and unmated in service, so unmating does not pull on the cable.
- Choose straight or right-angle by where the cable has to leave the connector, not afterwards; the datasheet VSWR limit is looser for right-angle plugs.
Background on cable support is in the cable assembly strain relief guide and on bend limits in the flex life and bend radius guide.
Swivel and flex life: define the test before quoting a number
MMCX is described as a lock-snap interface that allows 360-degree rotation (Wikipedia: MMCX connector). The datasheets above give a mating-cycle rating, not a swivel-life or cable bend-life rating. We do not publish swivel-life or flex-life figures for MMCX assemblies; where a program needs one, it is a test defined for that product and agreed in the quote.
| Item to define | Why it matters |
|---|---|
| Motion type | Mating and unmating, cable bending, and rotation of the swivelling interface wear different parts. Each needs its own count. |
| Bend radius, bend angle and cable position | The cable datasheet minimum bend radius and where the bend sits relative to the support point change the result more than the connector does. |
| Number of cycles and rate | A cycle count without a rate and a defined start and end position cannot be repeated on another fixture. |
| Load on the cable | Cable weight, side load and tension at the connector can reduce retention on small snap-on interfaces. |
| Acceptance criterion | State what counts as a pass: continuity during motion, return loss or VSWR change at a named frequency, or visual and retention condition afterwards. |
| Sample size and records | Agree how many assemblies are tested and what is recorded, so the result can be compared with the next lot. |
The measurement side (calibration, reference plane and fixtures) is covered under our testing capability, and the cable-level reasoning in the impedance control in coaxial cable manufacturing article.
Typical Applications for MMCX Cable Assemblies
MMCX is most useful when an RF interconnect must fit inside a product envelope that makes larger coax connectors impractical.
Embedded Antenna Leads
Compact MMCX pigtails for internal antenna routing in gateways, modems, telemetry units, and wireless embedded products where larger connectors waste enclosure space.
GPS and Navigation Electronics
Miniature RF interconnects for GNSS modules, portable terminals, and vehicle electronics that need a small connector with reliable coaxial shielding.
IoT and Industrial Wireless Devices
MMCX cable assemblies for sensors, remote monitoring devices, edge gateways, and wireless industrial electronics where low-profile RF connections simplify packaging.
Medical and Portable Instruments
Small coax assemblies for handheld equipment, compact diagnostic devices, and battery-powered instruments where routing space and product weight are tightly constrained.
RF Test Adaptors and Service Leads
MMCX to SMA or other mixed-end assemblies used for evaluation boards, debugging, field replacement, and engineering validation setups.
Legacy Replacement Programs
Second-source MMCX assemblies for imported or ageing devices where the original cable is hard to procure locally and dimensional compatibility matters more than catalogue convenience.
How We Build and Release an MMCX Program
Application and Interface Review
We review connector gender, mating hardware, cable diameter, target frequency range, enclosure space, and service expectations before confirming the assembly direction.
Cable and Connector Selection
Our team aligns the MMCX connector family, cable construction, and mixed-end interface around the required RF performance, route length, bend radius, and handling conditions.
Prototype and Fit Validation
Initial samples are built for physical fit, cable exit angle, mating access, and basic electrical confirmation so enclosure and routing issues are corrected before production.
Controlled Assembly and Inspection
Assemblies are processed with attention to stripping, centre-conductor preparation, shield treatment, connector attachment, and visual workmanship so consistency is maintained across lots.
Verification and Release
Finished builds are verified to the agreed acceptance plan, packed to protect small RF terminations, and released with the documentation needed for reorder stability.
What Usually Goes Wrong on Poorly Specified MMCX Assemblies
The biggest failure mode is treating the cable as an interchangeable commodity. Small changes in cable diameter, dielectric construction, or transition geometry can change retention, routing, and RF loss enough to create fit or performance issues later.
The second common problem is mechanical. Miniature RF connectors do not tolerate unsupported cable mass, repeated side loading, or uncontrolled bend points. If the internal route is not defined properly, the connector becomes the strain relief, which is exactly what you do not want.
Procurement becomes easier once the assembly is documented as a controlled part number with the exact cable, connector interface, acceptance checks, and revision history locked. That is how a prototype MMCX lead becomes a repeatable production item instead of a recurring sourcing problem.
How a typical mmcx cable assembly manufacturing program runs with us
This is an illustrative description of a representative project type, not a specific customer engagement. As a contract assembler we do not publish customer-identifiable data.
MMCX Cable Assembly FAQ
The main technical and sourcing questions we hear on compact RF pigtails and embedded coax assemblies.
An MMCX cable assembly is a compact 50 ohm coaxial interconnect that uses a snap-on micro RF connector designed for dense electronics and lightweight wireless products. It combines the selected miniature coax cable, MMCX plug or jack, shielding treatment, and controlled termination process into a ready-to-install RF lead or pigtail.
Need an MMCX RF Lead for a New Build or Replacement Program?
Send your drawing, mating connector reference, enclosure photo, or sample assembly and we will help define the right MMCX cable construction for prototype or repeat production.