The SCART Connector.
A technical briefing by J. S. Technology.
Introduction.
This document outlines the SCART connection and how it is used in a domestic home-cinema to connect
between Audio/Visual equipment. The SCART connector (Syndicat des Constructeurs d’Appareile
Radiorécepteurs et Téléviseurs) is used for combined audio and visual interconnection. A formal
description is given in CENELEC EN 50 049-1:1989 or IEC 933-1 [E-P Paul].
Overview.
The SCART connector, also known as the Pertitel, is a multi-purpose connector for use with domestic
video equipment. It provides video, audio, and control interconnections via a standard 21-pin
connection. The SCART connector is able to carry three different types of video information:
1:
Composite. The lowest quality signal carried by SCART where the luminance and chrominanceinformation is mixed. Due to the interference between the luminance and chrominance, this isconsidered to be poor in quality. A standard VHS VCR would produce composite.
2:
S-Video. This is a high quality type of video, sometimes incorrectly referred to as S-VHS. SVHS is a tape recording system derived from VHS designed to be higher in quality. S-Video hasluminance and chrominance information in the same way as composite, but with the two signals being
separate, there is no interference. An S-VHS VCR should have an S-Video source for optimum
performance.
3:
RGB. Similar to S-Video, RGB is a high quality video interface. RGB simply stands for Red,
Green, and Blue. These are the colours used to represent a picture by a TV. In a domestic source asynchronisation signal is also required, which would be present on the composite line.
The Physical Connector.

Figure 1. The SCART connector. Socket viewed from front. Many connectors have the pinnumbers marked.

The SCART Connector.
© J. S. Technology 2001.

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Pin Identification.
Composite only connection can be considered to be a subset of RGB where the RGB pins are not used.
However, S-Video requires that some be re-used [BBC, 1998]. Tables 1 and 2 detail the connections for
RGB/Composite and S-Video respectivley.
Pin Number

Pin Name

12345678

Audio Output, Right
Audio Input, Right
Audio Output, Left
Ground, Audio
Ground, Blue
Audio Input, Left
Blue Input
Function Select (A/V Control)

910111213141516Ground, GreenComms Data 2Green Input
Comms Data 1Ground, RedGround, blanking
Red Input
RGB switching Control

1718192021Ground, Video input & output
Ground, RGB Switching control
Video Output, composite
Video Input, composite
Common Ground, shield

Signal Level

Impedance0.5V RMS<1 kΩ
0.5V RMS<1 kΩ
0.5V RMS<1 kΩ
0.5V RMS<1 kΩ
0.7V
75 ΩHigh (9.5-12V) – A/V Mode, Mid (5-8V) –>10
Wide-screen, Low (0-2V) – TV ModekΩ0.7V75 Ω0.7V75 ΩHigh (1-3V) – RGB, Low (0-0.4) –75 ΩComposite
1V including sync
75 Ω
1V including sync
75 Ω-Table 1. RGB/Composite connection details for the SCART connector.
Pin Number

Pin NameSignal Level

1234567
8

Audio Output, Right
Audio Input, Right
Audio Output, Left
Ground, Audio
Ground, Blue
Audio Input, Left
Blue Input
Function Select (A/V Control)

9101112Ground, Green
Comms Data 2
Comms Data 1

0.5V RMS
0.5V RMS
0.5V RMS
0.5V RMS
0.7V
High (9.5-12V) – A/V Mode, Mid (5-8V) –Wide-screen, Low (0-2V) – TV Mode-The SCART Connector.
© J. S. Technology 2001.

Impedance
<1 kΩ
<1 kΩ
<1 kΩ
<1 kΩ75 Ω>10kΩ
Page 2131415
16
17
18
1920
21Ground, RedGround, blanking
Chrominance Input or Output*Ground, Video input & output
Luminance Output
Luminance Input
Common Ground, shield

0.3V
1V including sync
1V including sync
-75 Ω75 Ω75 Ω-Table 1. S-Video connection details for the SCART connector.
*Chrominance input or output is on the same pin. Luminance input and output is provided on two separate pins.

Conclusion.
The SCART connector is able to conveniently provide an interface for both audio and video in one
standardised connection. Described in this document are the pin assignments for three possible
connection means. S-Video and composite can be found with their own connectors [Sim, J. 2001], but
can also be carried by SCART either by an adapter or by a composite or S-Video to SCART lead.
References:[BBC, 1998] “The SCART Interface.” BBC Scotland North – Engineering Information.
http://www.bbc.co.uk/aberdeen/eng_info/scart_connector.shtml[E-P Paul] “Scart Connector.” Eric-Paul Rebel,
http://utopia.knoware.nl/users/eprebel/SoundAndVision/Engineering/SCART.html[Sim, J. 2001] “Video Connections.” Dr John Sim, J.S. Technology, 2001.

Version:Release Date:
Author:1.00
10/2001
Dr John Sim

J.S. Technology can not be held responsible for any loss,
damage, or injury arising from use of this information.
All information is believed to be accurate. If in any
doubt, check before attempting any electronics work.

The SCART Connector.
© J. S. Technology 2001.

J. S. Technology.
The Bungalow,
Cunninghamhead Estate,
Kilmarnock,Ayrshire.
KA3 2PE
United Kingdom.
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