FIELD GUIDESource-led reference

Side by side

MCX versus MMCX

Which miniature snap-on coaxial family matches the documented component?

Computer-generated illustration, not a photograph.
P228 · ConnectorMCX coaxial connector
Computer-generated illustration, not a photograph.
P229 · ConnectorMMCX coaxial connector

How they differ

  • MCX coaxial connector Compare body diameter and mating geometry against documentation; do not identify MCX from the acronym alone.
  • MMCX coaxial connector Use product documentation and relative scale to distinguish MMCX from MCX and board-level micro-coax families.

Then askWhich miniature snap-on coaxial family matches the documented component?

At a glance

Source-scoped form facts; counts, variants and unknowns are distinct
FieldMCX coaxial connectorMMCX coaxial connector
TypeConnectorConnector
FamilyCoaxCoax
Shaperoundround
Nominal contactsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity spanNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rowsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector roleNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Key distinctionMCX and MMCX are distinct miniature interfaces despite similar naming and snap-on behavior.A smaller snap-on RF connector is not automatically MMCX; verify the exact family and mating geometry.

Full evidence ledger and sources ↓

Illustrations are computer-generated with prior AI visual review; independent technical and rights review pending. A comparison is not a compatibility verdict.

This comparison stays within one evidence layer.

All selected records are Connector records. Similar layer does not mean compatible, interchangeable or safe to mate.

Families represented: Coax

The reference ledger

Read the same question across.

2 selected records · 13 fields
No score. No compatibility verdict.

On a narrow screen, scroll the table sideways or open the field-by-field reading view below. Illustrations are not a size comparison.

Comparison of selected field notes; source links accompany each documented specification
What you are comparing
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.
P228 / ConnectorMCX coaxial connector

Identification schematic · not to scale · drawing review pending

MMCX end-launch jack / side profile of Amphenol RF 908-22115. The original simplified outline separates the interface body and board-mount features. Not to scale; no electrical assignment or fit approval.
P229 / ConnectorMMCX coaxial connector

Identification schematic · not to scale · drawing review pending

LayerConnectorConnector
Key distinctionMCX and MMCX are distinct miniature interfaces despite similar naming and snap-on behavior.A smaller snap-on RF connector is not automatically MMCX; verify the exact family and mating geometry.
Nominal contactsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Positions / cavity spanNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Populated contactsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact rowsNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Contact pitchNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Dimensions / axisNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Connector roleNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
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.snap-on (Claim C229A); snap-on (Claim C229B); Push-onS233 · S253 · S233Named 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 MMCX 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.
Keying / polarizationNot recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
Documented identificationMCX compact snap-on RF connector family.C228AMMCX micro-miniature snap-on RF connector family.C229A
EvidenceC228A,C228X →
Independent review pending
C229A,C229X →
Independent review pending
Read field by field — no sideways scrolling

The same selected records, fields, values and source links as the table. Missing fields remain non-equivalent; no values are merged.

Layer

MCX coaxial connectorP228 / Connector
Connector
MMCX coaxial connectorP229 / Connector
Connector

Key distinction

MCX coaxial connectorP228 / Connector
MCX and MMCX are distinct miniature interfaces despite similar naming and snap-on behavior.
MMCX coaxial connectorP229 / Connector
A smaller snap-on RF connector is not automatically MMCX; verify the exact family and mating geometry.

Nominal contacts

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Positions / cavity span

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Populated contacts

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact rows

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Contact pitch

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Dimensions / axis

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Connector role

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Coupling / latch

MCX coaxial connectorP228 / Connector
snap-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.
MMCX coaxial connectorP229 / Connector
snap-on (Claim C229A); snap-on (Claim C229B); Push-onS233 · S253 · S233Named 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 MMCX 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.

Keying / polarization

MCX coaxial connectorP228 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.
MMCX coaxial connectorP229 / Connector
Not recordedNot recorded in a normalized source-scoped field. Consult the exact part/revision; no value inferred from illustrations.

Documented identification

MCX coaxial connectorP228 / Connector
MCX compact snap-on RF connector family.C228A
MMCX coaxial connectorP229 / Connector
MMCX micro-miniature snap-on RF connector family.C229A

Evidence

MCX coaxial connectorP228 / Connector
C228A,C228X →
Independent review pending
MMCX coaxial connectorP229 / Connector
C229A,C229X →
Independent review pending

Your next step

Use the distinction in context.

Continue the distinction

Compare next

Browse every comparison →

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.

Compare the named examples, not just the label.

The RF field guide keeps shell, centre contact, mounting role and the source discrepancy separate. No selected examples are approved as mates.

Open six reference rows and their evidence →

Adjust this comparison

Evidence behind this page

Scope first. Source second. Approval separate.

4 linked sources · 4 scoped claims · 0 sources with inspection/access flags.

Page scope: Evidence behind the compared records; the editorial comparison still needs separate review.

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 4 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

S233 · MMCX connectors

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

Within inspection window

Scoped support: Identifies MMCX as a micro-miniature snap-on RF connector family distinct from MCX.

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: MMCX 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).

S996 · Amphenol RF 262116TR exact MMCX product specifications

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

Within inspection window

Scoped support: Only Amphenol RF 262116TR, the named straight MMCX jack. 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 4 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)

C229A · P229

Amphenol RF identifies MMCX as a micro-miniature snap-on RF connector family distinct from MCX.

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: S233 · Evidence trail → (private workspace)

C229X · P229

Amphenol RF 262116TR is a straight MMCX jack. Its table reports brass body; gold finish, beryllium-copper contact; gold finish, pcb surface-mount 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 262116TR, the named straight MMCX jack. No family-wide geometry, mating pair, installed-cable performance or operating approval follows.

Source links: S996 · 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.