FIELD GUIDESource-led reference
Port & Cable

P228 / Coax / Connector

MCX coaxial connector

MCX is a compact snap-on RF coaxial connector family used where a smaller quick-connect interface is useful.

Also called MCX MCX RF connector

MCX and MMCX are distinct miniature interfaces despite similar naming and snap-on behavior.

Look for

Compare body diameter and mating geometry against documentation; do not identify MCX from the acronym alone.

Claim inspection dates: 2026-10-05, 2026-10-22 · Independent review pending

MCX coaxial connector: three-quarter view. Computer-generated illustration, not a photograph.

Three-quarter view Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

MCX coaxial connector: mating face. Computer-generated illustration, not a photograph.

Mating face Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

MCX coaxial connector: fitted in place. Computer-generated illustration, not a photograph.

Fitted in place Computer-generated illustration with prior AI visual review. Not a photograph, measurement or compatibility check. Independent technical and rights review pending.

MCX coaxial connector: original recognition drawing, not to scale.

Recognition drawing Original schematic, not to scale. Drawing review pending.

Image inspection / P228

See the view. Check its scope.

2 registered views for this reference. Different part examples are not automatically mates; all remain not to scale and independently unapproved.

MCX surface-mount jack / side profile of Amphenol RF 919-384J-51P. The original simplified outline separates the interface body and board-mount features. Not to scale; no electrical assignment or fit approval. (private workspace)

P228 / Source-observed physical study

MCX surface-mount jack / side profile

Amphenol RF 919-384J-51P

Orthographic side profile · Device receptacle

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)
MCX surface-mount jack / board-side view of Amphenol RF 919-384J-51P. The original simplified outline separates the interface body and board-mount features. Not to scale; no electrical assignment or fit approval. (private workspace)

P228 / Source-observed physical study

MCX surface-mount jack / board-side view

Amphenol RF 919-384J-51P

Orthographic board-side axial view; not the mating face · Device receptacle

Not to scale. Technical and rights review pending.

Inspect view & provenance (private workspace)

REPAIR FIELD NOTES / Miniature RF coax & antennas

First verify the exact manufacturer series

MCX is a snap-on coax family, not an MHF adapter

No generic mating is established. Amphenol identifies MCX as a compact snap-on RF coax connector family, but its mating form is not automatically an internal Hirose U.FL or I-PEX MHF family. Choose an exact manufacturer-rated adapter or cable assembly for both ends.

Avoid: Using "snap-on coax" as if it described one physically universal RF mating surface.

Full source-scoped reading and three practical checks ↗
Qualitative distinction between Hirose U.FL and I-PEX MHF I / MHF 4. Series number and plug/receptacle pair are essential. Not to scale, no pinout, no mating approval.
U.FL / MHF — tiny does not mean equalSeries number and plug/receptacle pair are essential. Original conceptual evidence diagram only, not part-number geometry, a live-circuit test, or manufacturer-approved fit.

These notes add editorial context to the original canonical reference; they do not change its claim IDs or prove mating, wiring or polarity.

The useful distinction

Recognize it. Then verify it.

MCX is a compact snap-on RF coaxial connector family used where a smaller quick-connect interface is useful. [C228A]

Amphenol RF 919-NM174P51A1X is a right-angle MCX plug. Its table reports beryllium-copper body; gold/white-bronze finish, beryllium-copper contact; gold finish, pcb through-hole construction; solder contact termination, push-on coupling, 50-ohm impedance, a 6-GHz frequency ceiling and 500 minimum mating cycles. It identifies a PTFE insulator. These are exact-part manufacturer specifications, not family-wide ratings or independent test results. [C228X]

Source-scoped identification facts

Each value retains its exact example, role and measurement axis. Facts from different parts must not be combined into an invented component.

Documented examples; not a mating drawing or compatibility approval
Coupling / latchsnap-on (Claim C228A); snap-on (Claim C228B); Push-onS232 · S252 · S232Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof. V40 engineering-reference fact only; independent human review remains pending. This claim does not approve fabrication, rewiring, substitution, electrical safety, protocol support or end-to-end compatibility. Named series only, not every family part: Amphenol RF MCX product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.; MCX page technical table2255VRMS conflicts with~225VRMS overview; voltage not adopted.
ManufacturerAmphenol RFS232Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: Amphenol RF MCX product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.; MCX page technical table2255VRMS conflicts with~225VRMS overview; voltage not adopted.
SeriesMCXS232Named source examples retain separate role, part, view and axis limits; values are not a universal family specification. Named series only, not every family part: Amphenol RF MCX product family. Family coupling is useful identification context but is not automatically counted as a polarization/keying fact.; No part suffix, row/contact pitch, dimensional axis, physical marking or universal performance limit inferred.; MCX page technical table2255VRMS conflicts with~225VRMS overview; voltage not adopted.

Not recorded: Nominal contacts, Positions / cavity span, Populated contacts, Contact rows, Contact pitch, Dimensions / axis, Connector role, Contact gender / arrangement, Mounting, Keying / polarization, Shell / form, Exact part / implementation, Recorded markings, View convention. Unknown fields stay unknown; illustrations supply no measurements or pin assignments.

Recorded variant and source limits
  • Coupling style or polarity identity does not establish cable type, impedance, frequency range or system compatibility for a specific assembly.
  • No fabrication dimensions or mating-face contact locator is published.
Report a correction to these facts →

Bounded facts, visible unknowns

Specifications and limits

MCX coaxial connector facts and limitations
Documented identificationMCX compact snap-on RF connector family. [C228A]
Mechanical dimensionsNo independently reviewed mechanical drawing in V39; do not use this page for fabrication, fit testing or tolerance work.
Engineering pinoutSource-checked engineering profile available; independent review pending. Open engineering profile →
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

Use the source-backed form or position count only for identification. Resolve ratings, protocol, direction, wiring, cable construction and exact device support from the relevant equipment and component documentation.

Before you connect

What to check

  1. Identify the exact connector family and variant from the equipment or cable documentation.
  2. Keep shape, contact count, protocol, electrical rating and device support as separate facts.
  3. Do not force, rewire or adapt a connector from this recognition record; resolve the remaining requirements first.
Trace a supported connection class →

What is not established

This field note does not approve a connection, adapter, cable assembly, rewiring scheme or fabricated part. It intentionally omits unsupported pin assignments and mechanical tolerances.

Your next step

Move from the form to the requirement.

Read the engineering reference Source-scoped details, orientation and explicit unknowns.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

Back to first citation ↑
C228ASource checked · pending review

Amphenol RF identifies MCX as a compact snap-on RF connector family.

Amphenol RF · MCX connectors ↗

Locator: MCX overview
Access: public page. Identification/reference scope only. V39 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

S232: full source recordInspect review dependencies → (private workspace)

Claim scope: V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.. Next review due 2027-01-03.

Back to first citation ↑
C228XSource checked · pending review

Amphenol RF 919-NM174P51A1X is a right-angle MCX plug. Its table reports beryllium-copper body; gold/white-bronze finish, beryllium-copper contact; gold finish, pcb through-hole construction; solder contact termination, push-on coupling, 50-ohm impedance, a 6-GHz frequency ceiling and 500 minimum mating cycles. It identifies a PTFE insulator. These are exact-part manufacturer specifications, not family-wide ratings or independent test results.

Amphenol RF · Amphenol RF 919-NM174P51A1X exact MCX product specifications ↗

Locator: Full Product Specifications table: Body Material/Finish, Contact Material/Finish, Contact Termination, Termination Style, Coupling Mechanism, Orientation, Gender, Impedance (Ohms), Frequency (Max GHz), and Mating Cycles (Min).
Access: public page. Text-only exact-part specification inspection. Customer drawing pixels not acquired; no dimensions, contact numbering, installation approval or hardware testing.

S995: full source recordInspect review dependencies → (private workspace)

Claim scope: Only Amphenol RF 919-NM174P51A1X, the named right-angle MCX plug. No family-wide geometry, mating pair, installed-cable performance or operating approval follows.. Next review due 2027-01-20.

Suggest a correction to this field note →

Put this field note to work.

Add to discovery trayRecord an unsaved candidate (private workspace)

Compare look-alikes: MCX versus MMCX

Candidate selection does not confirm the identity or capabilities of your physical item.

NAMED-PART REFERENCE / NO UNIVERSAL FIT RESULT

Same task.
Different interface and mount.

Two separately documented board jacks illustrate what to establish before choosing a component. Neither drawing makes these two parts mates or interchangeable replacements.

MMCX / Amphenol RF 908-22115

Component role
End-launch PCB jack
Recognition cue
Mating-side body to board-edge termination; inspect the named outline, not a generic catalog photo.
Declared product impedance
50 ohm for this named example only; not every connector sharing the family label.
Not established
Equipment identity, opposite part, application wiring, board layout suitability, performance of a complete path or interchangeability.
Next check
Verify both exact part numbers and current customer drawings. Keep mounting style, interface family and application requirements separate.

Manufacturer product identity ↗ · Inspected customer drawing ↗

Observed 11 October 2026. Downloaded PDF page 1 (printed sheet 2 of 2), revision B. Left profile and centre axial view; title block part 908-22115.

Source discrepancy: Product page maximum temperature is 85 C; drawing notes +90 C. Neither temperature value is used in the illustration or chart. Revision reconciliation remains open.

Open the complete reference and both views →

MCX / Amphenol RF 919-384J-51P

Component role
Surface-mount PCB jack
Recognition cue
Distinguish the board-side axial view from the mating face. The shown mounting corners are part-specific.
Declared product impedance
50 ohm for this named example only; not every connector sharing the family label.
Not established
Equipment identity, opposite part, application wiring, board layout suitability, performance of a complete path or interchangeability.
Next check
Verify both exact part numbers and current customer drawings. Keep mounting style, interface family and application requirements separate.

Manufacturer product identity ↗ · Inspected customer drawing ↗

Observed 11 October 2026. Downloaded PDF page 1 (printed sheet 2 of 2), revision A dated 4 July 2016. Left side profile and centre board-side axial view; title block part 919-384J-51P.

Open the complete reference and both views →

No nominal dimensions or temperature ratings have been imported into canonical evidence. These two visual-source observations are not new canonical claim/source records. The earlier family-level claims and dates remain unchanged.

NAMED-PART REFERENCE / SHELL, CONTACT & MOUNT

Separate the interface from its termination.

The named MCX/MMCX examples use different board-mounting arrangements. This is not a comparison of a mating pair.

Amphenol RF 919-384J-51P

Component role
PCB jack
Termination
PCB surface-mount
Centre-contact scope
Mounting-role comparison only; no center-contact gauge is imported.
Inspect the declared view → (private workspace)

Match the complete family and named part drawing; surface-mount and end-launch roles are not interchangeable from silhouette.

Evidence, date & limits

inherited V126 observation; not re-inspected in V127. Observation date: . Mounting-role comparison only; no center-contact gauge is imported.

919-384J-51P MCX surface-mount PCB jack — customer outline drawing ↗
Downloaded PDF page 1 (printed sheet 2 of 2), revision A dated 4 July 2016. Left side profile and centre board-side axial view; title block part 919-384J-51P.

Not established: Exact mate, board land pattern, solder process, enclosure fit and complete RF path.

Next check: Match the complete family and named part drawing; surface-mount and end-launch roles are not interchangeable from silhouette.

No hardware test or independent technical approval. The two MCX/MMCX observations retain their V126 inspection history; the new rows do not refresh those sources.

Read all six source-qualified examples and printable guide →

Evidence behind this page

Scope first. Source second. Approval separate.

2 linked sources · 2 scoped claims · 0 sources with inspection/access flags.

Page scope: catalogue_expansion_v39

Assessment 2026-10-22 · earliest scheduled source review 2027-01-03. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 2 source scopes, access limits and dates

S232 · MCX connectors

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-05 · due 2027-01-03

Within inspection window

Scoped support: Identifies MCX as a compact snap-on RF connector family available in multiple impedance/application variants.

Not established / limitations: Identification/reference scope only. V39 does not convert this source into a universal pinout, fabrication drawing, electrical approval, protocol guarantee or end-to-end compatibility verdict.

Locator: MCX overview

S995 · Amphenol RF 919-NM174P51A1X exact MCX product specifications

Amphenol RF · Manufacturer / product-owner domain · inspected 2026-10-22 · due 2027-01-20

Within inspection window

Scoped support: Only Amphenol RF 919-NM174P51A1X, the named right-angle MCX plug. No family-wide geometry, mating pair, installed-cable performance or operating approval follows.

Not established / limitations: Text-only exact-part specification inspection. Customer drawing pixels not acquired; no dimensions, contact numbering, installation approval or hardware testing.

Locator: Full Product Specifications table: Body Material/Finish, Contact Material/Finish, Contact Termination, Termination Style, Coupling Mechanism, Orientation, Gender, Impedance (Ohms), Frequency (Max GHz), and Mating Cycles (Min).

Trace 2 claims to their source records

C228A · P228

Amphenol RF identifies MCX as a compact snap-on RF connector family.

Claim scope: V39 catalogue-expansion identification fact only; not independent technical approval, fabrication data, wiring instruction, protocol guarantee or end-to-end compatibility proof.

Source links: S232 · Evidence trail → (private workspace)

C228X · P228

Amphenol RF 919-NM174P51A1X is a right-angle MCX plug. Its table reports beryllium-copper body; gold/white-bronze finish, beryllium-copper contact; gold finish, pcb through-hole construction; solder contact termination, push-on coupling, 50-ohm impedance, a 6-GHz frequency ceiling and 500 minimum mating cycles. It identifies a PTFE insulator. These are exact-part manufacturer specifications, not family-wide ratings or independent test results.

Claim scope: Only Amphenol RF 919-NM174P51A1X, the named right-angle MCX plug. No family-wide geometry, mating pair, installed-cable performance or operating approval follows.

Source links: S995 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.