RCA (connector): Difference between revisions

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{{hatnote|Canonical page name: <code>{{FULLPAGENAME}}</code>}}

The '''RCA connector''' (also known as a phono connector or cinch connector) is a coaxial electrical connector widely used in consumer audio and video equipment. It consists of a central male pin surrounded by a cylindrical metal shield, mated to a corresponding female jack by a simple push-fit. The RCA connector is the most common audio and video connector found on consumer CRT televisions, where it carries [[Composite (CVBS)|composite video]] (yellow), stereo audio (red and white), and on later sets, [[Component (YPbPr)|component video]] (red, green, blue).

== History ==

The RCA connector was developed by the Radio Corporation of America (RCA) in the late 1930s as a low-cost connector for internal use in radio-phonograph consoles. By 1937, RCA was using the connector inside its model U-109 radio-phonograph, and by 1938 had migrated the female jack to the rear panel of desktop AM radios, labeled "Victrola," "Phono," or "Pick-up," to allow customers to attach an external phonograph.<ref name="wp-rca">[https://en.wikipedia.org/wiki/RCA_connector "RCA connector"], Wikipedia.</ref>

In the 1950s, RCA connectors began replacing the older quarter-inch phone connectors in consumer audio as component hi-fi systems grew in popularity.<ref name="wp-rca" /> The connector's low cost, compact size, and ease of use made it ideal for mass-market consumer electronics.

By the 1980s, the RCA connector had been adopted for video use as well, becoming the standard method for connecting VCRs, game consoles, LaserDisc players, and other devices to televisions. The familiar yellow (video), red (right audio), and white (left audio) color-coded trio became one of the most recognizable cable configurations in home electronics, remaining standard through the CRT era and beyond.

In some European countries, particularly France and Germany, the RCA connector is known as a "cinch" connector, after the Chicago-based manufacturer Cinch which also produced the design.<ref name="wp-rca" />

== Design ==

The RCA connector uses an unbalanced, single-ended coaxial design. The male plug features a central signal pin (3.175 mm / ⅛" diameter) surrounded by a segmented outer ring that provides the ground connection and spring-grips onto the female jack's outer barrel (8.25 mm / ⅓" outer diameter).<ref name="wp-rca" />

Connections are made by pushing the plug into the jack. Because the signal pin typically makes contact before the ground ring, plugging or unplugging RCA connectors while equipment is powered on often produces an audible pop or hum through connected speakers. This is a well-known limitation of the design.

While RCA connectors are nominally used for 75Ω video signals, the connector itself does not maintain a consistent 75Ω characteristic impedance due to its physical dimensions. This impedance mismatch is negligible for audio and low-frequency applications, but can cause minor signal degradation for video — particularly over longer cable runs. Professional video equipment uses [[BNC]] connectors instead for this reason.<ref name="eetimes">[https://www.eetimes.com/the-rca-phono-plug-an-outdated-relic/ "The RCA phono plug: An outdated relic?"], EE Times.</ref>

== Color Coding ==

RCA plugs and jacks are color-coded by convention to aid correct connections. The standard colors found on CRT televisions are:

{| class="wikitable"

! Color !! Signal !! Notes

|-

| style="background:yellow; color:black;" | '''Yellow''' || [[Composite (CVBS)|Composite video]] || Standard-definition analog video

|-

| style="background:white; color:black; border:1px solid #ccc;" | '''White''' || Left audio (L) || Sometimes black on older equipment

|-

| style="background:red; color:white;" | '''Red''' || Right audio (R) || "Red = Right"

|-

| style="background:green; color:white;" | '''Green''' || Component Y (luminance) || Part of [[Component (YPbPr)|YPbPr]] component video

|-

| style="background:blue; color:white;" | '''Blue''' || Component Pb || Part of [[Component (YPbPr)|YPbPr]] component video

|-

| style="background:red; color:white;" | '''Red''' || Component Pr || Part of [[Component (YPbPr)|YPbPr]] (second red — ''not'' audio)

|-

| style="background:orange; color:white;" | '''Orange''' || S/PDIF digital audio || Coaxial digital audio output

|}

The presence of two red connectors (one for right audio, one for component Pr) on the same device is a common source of confusion. On CRT televisions with both composite and component inputs, the jacks are usually grouped and labeled to distinguish the two.

== Use on CRT Televisions ==

RCA connectors are the most common audio/video interface on consumer CRT televisions worldwide (outside of Europe, where [[SCART]] dominated). Typical configurations include:

* '''Composite A/V''' — a group of three jacks (yellow, white, red) providing one [[Composite (CVBS)|composite video]] input and stereo audio. Most CRT sets from the early 1980s onward include at least one set, with many offering two or three (rear, front, and/or side panel).

* '''Component video''' — a group of three jacks (green, blue, red) for [[Component (YPbPr)|YPbPr]], found on higher-end CRT sets from the late 1990s and 2000s. Component inputs support progressive scan (480p) and in some cases HD resolutions (720p, 1080i), making them the highest-quality analog video input available on most consumer CRT televisions.

* '''Audio output''' — red and white jacks providing a fixed or variable audio output for connecting external speakers or amplifiers.

* '''Monitor output''' — some sets provide composite video and audio outputs that mirror the tuner or selected input, allowing recording to a VCR.

RCA jacks on CRT televisions are sometimes shared or switched between composite and component inputs. For example, on many sets, the green component jack doubles as a second composite video input, with an on-screen menu selection toggling between the two modes.

== Adapters ==

Simple passive adapters are widely available to convert between RCA and other connector types:

* '''RCA to [[BNC]]''' — allows consumer RCA cables to connect to professional monitors with BNC inputs, or vice versa. This is one of the most common adapters in the retro gaming community.

* '''RCA to [[SCART]]''' — adapters and cables allow composite video and stereo audio connections to European SCART-equipped sets.

* '''RCA to 3.5 mm''' — for connecting to devices with mini-jack audio outputs.

== See Also ==

* [[Composite (CVBS)]] — Video signal commonly carried over yellow RCA

* [[Component (YPbPr)]] — Higher-quality video signal carried over three RCA connectors

* [[BNC]] — Professional alternative to RCA for video signals

* [[SCART]] — European multi-signal connector that carries RCA-equivalent signals

* [[RF (F-type)]] — RF antenna/cable connector, the other ubiquitous CRT television connector

== References ==

[[Category:Connector types]]

@@ Line 1: / Line 1: @@
+{{DISPLAYTITLE:RCA}}
+{{hatnote|Canonical page name: <code>{{FULLPAGENAME}}</code>}}
+The '''RCA connector''' (also known as a phono connector or cinch connector) is a coaxial electrical connector widely used in consumer audio and video equipment. It consists of a central male pin surrounded by a cylindrical metal shield, mated to a corresponding female jack by a simple push-fit. The RCA connector is the most common audio and video connector found on consumer CRT televisions, where it carries [[Composite (CVBS)|composite video]] (yellow), stereo audio (red and white), and on later sets, [[Component (YPbPr)|component video]] (red, green, blue).
+== History ==
+The RCA connector was developed by the Radio Corporation of America (RCA) in the late 1930s as a low-cost connector for internal use in radio-phonograph consoles. By 1937, RCA was using the connector inside its model U-109 radio-phonograph, and by 1938 had migrated the female jack to the rear panel of desktop AM radios, labeled "Victrola," "Phono," or "Pick-up," to allow customers to attach an external phonograph.<ref name="wp-rca">[https://en.wikipedia.org/wiki/RCA_connector "RCA connector"], Wikipedia.</ref>
+In the 1950s, RCA connectors began replacing the older quarter-inch phone connectors in consumer audio as component hi-fi systems grew in popularity.<ref name="wp-rca" /> The connector's low cost, compact size, and ease of use made it ideal for mass-market consumer electronics.
+By the 1980s, the RCA connector had been adopted for video use as well, becoming the standard method for connecting VCRs, game consoles, LaserDisc players, and other devices to televisions. The familiar yellow (video), red (right audio), and white (left audio) color-coded trio became one of the most recognizable cable configurations in home electronics, remaining standard through the CRT era and beyond.
+In some European countries, particularly France and Germany, the RCA connector is known as a "cinch" connector, after the Chicago-based manufacturer Cinch which also produced the design.<ref name="wp-rca" />
+== Design ==
+The RCA connector uses an unbalanced, single-ended coaxial design. The male plug features a central signal pin (3.175 mm / ⅛" diameter) surrounded by a segmented outer ring that provides the ground connection and spring-grips onto the female jack's outer barrel (8.25 mm / ⅓" outer diameter).<ref name="wp-rca" />
+Connections are made by pushing the plug into the jack. Because the signal pin typically makes contact before the ground ring, plugging or unplugging RCA connectors while equipment is powered on often produces an audible pop or hum through connected speakers. This is a well-known limitation of the design.
+While RCA connectors are nominally used for 75Ω video signals, the connector itself does not maintain a consistent 75Ω characteristic impedance due to its physical dimensions. This impedance mismatch is negligible for audio and low-frequency applications, but can cause minor signal degradation for video — particularly over longer cable runs. Professional video equipment uses [[BNC]] connectors instead for this reason.<ref name="eetimes">[https://www.eetimes.com/the-rca-phono-plug-an-outdated-relic/ "The RCA phono plug: An outdated relic?"], EE Times.</ref>
+== Color Coding ==
+RCA plugs and jacks are color-coded by convention to aid correct connections. The standard colors found on CRT televisions are:
+{| class="wikitable"
+! Color !! Signal !! Notes
+|-
+| style="background:yellow; color:black;" | '''Yellow''' || [[Composite (CVBS)|Composite video]] || Standard-definition analog video
+|-
+| style="background:white; color:black; border:1px solid #ccc;" | '''White''' || Left audio (L) || Sometimes black on older equipment
+|-
+| style="background:red; color:white;" | '''Red''' || Right audio (R) || "Red = Right"
+|-
+| style="background:green; color:white;" | '''Green''' || Component Y (luminance) || Part of [[Component (YPbPr)|YPbPr]] component video
+|-
+| style="background:blue; color:white;" | '''Blue''' || Component Pb || Part of [[Component (YPbPr)|YPbPr]] component video
+|-
+| style="background:red; color:white;" | '''Red''' || Component Pr || Part of [[Component (YPbPr)|YPbPr]] (second red — ''not'' audio)
+|-
+| style="background:orange; color:white;" | '''Orange''' || S/PDIF digital audio || Coaxial digital audio output
+|}
+The presence of two red connectors (one for right audio, one for component Pr) on the same device is a common source of confusion. On CRT televisions with both composite and component inputs, the jacks are usually grouped and labeled to distinguish the two.
+== Use on CRT Televisions ==
+RCA connectors are the most common audio/video interface on consumer CRT televisions worldwide (outside of Europe, where [[SCART]] dominated). Typical configurations include:
+* '''Composite A/V''' — a group of three jacks (yellow, white, red) providing one [[Composite (CVBS)|composite video]] input and stereo audio. Most CRT sets from the early 1980s onward include at least one set, with many offering two or three (rear, front, and/or side panel).
+* '''Component video''' — a group of three jacks (green, blue, red) for [[Component (YPbPr)|YPbPr]], found on higher-end CRT sets from the late 1990s and 2000s. Component inputs support progressive scan (480p) and in some cases HD resolutions (720p, 1080i), making them the highest-quality analog video input available on most consumer CRT televisions.
+* '''Audio output''' — red and white jacks providing a fixed or variable audio output for connecting external speakers or amplifiers.
+* '''Monitor output''' — some sets provide composite video and audio outputs that mirror the tuner or selected input, allowing recording to a VCR.
+RCA jacks on CRT televisions are sometimes shared or switched between composite and component inputs. For example, on many sets, the green component jack doubles as a second composite video input, with an on-screen menu selection toggling between the two modes.
+== Adapters ==
+Simple passive adapters are widely available to convert between RCA and other connector types:
+* '''RCA to [[BNC]]''' — allows consumer RCA cables to connect to professional monitors with BNC inputs, or vice versa. This is one of the most common adapters in the retro gaming community.
+* '''RCA to [[SCART]]''' — adapters and cables allow composite video and stereo audio connections to European SCART-equipped sets.
+* '''RCA to 3.5 mm''' — for connecting to devices with mini-jack audio outputs.
+== See Also ==
+* [[Composite (CVBS)]] — Video signal commonly carried over yellow RCA
+* [[Component (YPbPr)]] — Higher-quality video signal carried over three RCA connectors
+* [[BNC]] — Professional alternative to RCA for video signals
+* [[SCART]] — European multi-signal connector that carries RCA-equivalent signals
+* [[RF (F-type)]] — RF antenna/cable connector, the other ubiquitous CRT television connector
+== References ==
+<references />
 [[Category:Connector types]]