Vga Pin 9

Updated August 15, 2026

Overview

Product sourcing insights & recommendations

25 来源

The phrase "VGA pin 9" refers to a critical but often misunderstood component of the analog video standard. Historically, pin 9 was used as a "KEY" (mechanically blocked) to prevent incorrect orientation, but it evolved into a +5V DC power source used to power the monitor's EDID (Extended Display Identification Data) chip Pcreview Cablechick.

1. Product Context: What is "VGA Pin 9"?

* The Power Role: In modern 15-pin (HD15) VGA cables, pin 9 provides power to the monitor's identification chip, allowing the computer to recognize supported resolutions even when the monitor is off Pcreview Pcbtok.

* The Missing Pin Mystery: Many budget or older cables are "14-pin" versions that physically lack pin 9. While they still transmit video, they can cause "Generic Monitor" detection issues in modern OS environments Pcreview Startech.

* The DB9 Confusion: Users searching for "9-pin VGA" are often actually looking for legacy DB9 connectors used in 1980s video standards (CGA/EGA) or modern industrial serial ports Alibaba Alibaba.

2. Market Trends & Insights

* Retro Computing Resurgence: There is a significant rise in demand for DB9-to-VGA adapters (estimated 37–42% growth in hobbyist sectors) driven by collectors of vintage IBM and Commodore hardware Alibaba.

* Industrial Infrastructure: A core B2B market persists for specialized VGA components to maintain high-value industrial controllers, medical imaging devices, and legacy security DVR systems Dataintelo Alibaba.

* Market Valuation: The global VGA connector market was valued at $2.8 billion in 2025 and is projected to reach $3.9 billion by 2034 (3.7% CAGR), sustained by "infrastructure inertia" in commercial sectors Dataintelo.

* Technical Specialization: The market is bifurcating between commodity passive cables ($0.30–$2.00) and premium shielded/industrial adapters ($25+) designed for high-interference factory environments Alibaba Alibaba Alibaba.

3. Sourcing Opportunities

I have identified several product categories matching these requirements, ranging from standard 15-pin cables to specialized DB9 adapters for legacy video systems.

Based on the technical nuances of Pin 9, would you like to:

Sources & References

25 sources cited · Verified industry data & reports

What is Pin 9 on a VGA cable? - PC Review

pcreview.co.uk

Pin 9 powers the EDID EEPROM chip in the monitor. If the EDID cannot be read, then PnP won't be able to determine the monitor's specs.

VGA connector

Wikipedia

The Video Graphics Array (VGA) connector is a standard connector used for computer video output. Originating with the 1987 IBM PS/2 and its VGA graphics system.

Is it OK to use VGA pin 9 to power something like a signal ...

Reddit · r/AskElectronics

The VGA pin 9 provides 5V power. It seems like it would be a convenient way to power something like a XNOR sync combiner for converting to SCART, or ...

Types and Uses of VGA Cables

SF Cable

Pin 8 (BGND): Dedicated ground for the blue signal. Pin 9 (KEY): Typically missing; sometimes used for +5V output. Pin 10 (SGND): Sync ...

VGA Connector Pinout Explained: Importance and ...

PCBTok

Pin 9 KEY: +5 V DC output from the graphics card. Pin 10 ... Since it is quite flexible and widely used, VGA retains its superiority today.

VGA Expose: Everything there is to know about VGA

Cable Chick

Pin 9 is now utilised for a 5v DC power rail, and pin 15 is the VESA DDC (Display Data Channel). The power line is designed to run the EDID or ...