Video connectors are a critical interface between source devices, display systems and control infrastructure. While digital standards now dominate, legacy analogue and hybrid formats remain deeply embedded across industrial, commercial AV, education and test environments. Selecting the correct video connector is therefore less about choosing the “newest” format and more about matching resolution, signal type, mechanical interface and long-term availability to the application.
This guide is intended to help engineers and procurement teams evaluate video connector options with confidence, balancing performance, compatibility, and lifecycle risk.
Video signal types & standards overview
Video connectors can fall into two broad categories: analogue and digital. Each has unique characteristics, applications, and limitations that influence connector selection.
Analogue Video Connectors
Analogue interfaces transmit continuous signals representing image information. VGA connectors carry analogue RGB signals and remain common in industrial PCs, legacy displays, KVMs, and control systems. They tolerate longer cable runs but have limited resolution and are prone to signal degradation. SCART connectors, primarily found in older consumer and broadcast equipment, support composite, RGB, and audio signals in a single interface. While largely obsolete, they still appear in maintenance, retrofit, and repair scenarios.
Digital Video Connectors
Digital connectors transmit discrete pixel data, enabling higher resolutions, consistent signal integrity, and support for additional features like multi-channel audio and copy protection. DVI connectors come in digital-only (DVI-D), analogue (DVI-A), and integrated (DVI-I) variants. They are common in professional displays and fixed installations, offering secure coupling and predictable performance without audio complexity. HDMI connectors dominate modern consumer and professional AV systems, supporting high-resolution video, multi-channel audio, HDCP content protection, and compact form factors. Careful specification is essential, considering version compatibility, cable length, mechanical retention, and strain relief, especially in industrial or high-vibration environments.
Connector Selection & Adaptation
Many systems require adapters to bridge formats - such as HDMI to DVI, DVI to VGA, or HDMI to VGA (active conversion). When using adapters, consider digital-to-analogue conversion, power requirements, HDCP compliance, and resolution limitations. In professional or industrial contexts, adapters should be treated as integral functional components, not optional accessories.
Adapters, jack solutions & format bridging
Adapters are commonly used to bridge:
- HDMI to DVI
- DVI to VGA
- HDMI to VGA (active conversion required)
Important considerations:
- Digital-to-analogue conversion requirements
- Power needs for active adapters
- HDCP compatibility
- Resolution and refresh rate limitations
For professional systems, adapters should be treated as functional components, not accessories, and specified accordingly.
Design, procurement & lifecycle considerations
Mechanical & environmental factors
- Connector retention and strain relief
- Panel-mount vs cable-mount configurations
- Resistance to vibration and repeated mating cycles
Availability & obsolescence
- HDMI connectors are widely available but evolve rapidly
- VGA and SCART connectors face declining long-term support
- DVI connectors offer a balance of stability and compatibility
Procurement teams should assess not only current needs, but spares availability and system longevity.
Compliance & standards notes
Video connectors and assemblies may need to comply with:
- HDMI licensing and compliance requirements
- EMC and signal integrity standards
- RoHS and environmental regulations
Ensuring compliance reduces integration risk and avoids costly redesigns.
Summary
Video connectors span multiple generations of technology, and effective selection depends on signal type, mechanical design, compatibility, and lifecycle planning. By understanding the strengths and limitations of HDMI, DVI, VGA, and SCART connectors—along with appropriate use of adapters—engineers and buyers can make informed, future-resilient decisions.
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FAQs
What is the difference between HDMI and DVI connectors?
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HDMI supports both digital video and audio, while DVI typically carries video only. HDMI is more compact, while DVI offers robust mechanical retention.
Are VGA connectors still relevant?
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Yes, particularly in industrial and legacy systems, though they are limited in resolution and gradually being phased out.
Can HDMI be adapted to VGA?
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Yes, but it requires an active adapter to convert digital signals to analogue.
When should DVI be specified instead of HDMI?
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DVI is often preferred in fixed installations where audio is not required and long-term interface stability is important.
Are SCART connectors still used?
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SCART connectors are mostly used for maintenance or legacy system support and are rarely specified in new designs.
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