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ATX Floppy Power Connector

Type	DC connector
General specifications
Hot pluggable	No
Cable	Individual wires
Pins	4
Electrical
Signal	DC power
Max. voltage	+5 and +12 Volt
Max. current	3 Amp each voltage
Pinout
Pin	Color	Description
Pin 1	Red	+5 Volt
Pin 2	Black	Ground
Pin 3	Black	Ground
Pin 4	Yellow	+12 Volt

ATX Floppy Power Connector is a standardized electrical connector that supplied DC power to 3.5-inch floppy drives inside "Wintel" (Windows/Intel) computers. In the past, this connector was also used as an auxiliary power source for AGP video cards, then later as a power source for card reader bays and USB hub bays. Though modern computers no longer contain floppy drives, many new ATX power supplies still have this DC connector.

Other vernacular terms have been incorrectly used as names for the 3.5-inch floppy drive power connector, such as "Berg" or "Mini-Molex". The term Berg was derived from Berg Electronics, a connector company which no longer exists, while Molex is another connector company.

The floppy drive power connector and cable is defined in TBD specification.(ref here)

Connector pitch:

• 2.50 millimetres (0.098 in) (distance from center to center of neighbor pins).

Female cable from ATX power supply:^[1]

• Consists of four individual 20 AWG wires. The color of the wire insulation for pin 1 must be red, pin 2 and 3 must be black, pin 4 must be yellow.
• Plastic housing is TE Connectivity (AMP) 171822-4.
• Female metal contact pins are choice of TE Connectivity (AMP) 170204-x or 170262-x, where "x" is 1 or 2 or 4.^[2][3]

Male header on PCB:

• The male PCB connector on the 3.5" floppy drive is a polarized right-angle male header, which is a TE Connectivity (AMP) 171826-4,^[4] the vertical model is TE Connectivity (AMP) 171825-4.^[5]

• ATX PATA power connector - for parallel IDE hard drives, 5.25-inch floppy drives, ... also known as 4-pin Molex hard drive connector
• ATX SATA power connectors - for serial hard drives
• ATX motherboard power connectors

• Various PC power supply cables and connectors
• Using PC power supplies in things other than PCs

ATX Power Supply Specifications

• ATX / ATX12V Power Supply Design Guide, v1.1
• ATX12V Power Supply Design Guide, v1.3
• ATX12V Power Supply Design Guide, v2.01
• ATX12V Power Supply Design Guide, v2.2
• ATX12V Power Supply Design Guide, v2.3 (Power Supply Design Guide for Desktop Platform Form Factors, v1.1)
• ATX12V Power Supply Design Guide, v2.31 (Power Supply Design Guide for Desktop Platform Form Factors, v1.2)
• ATX12V Power Supply Design Guide, v2.4 (Power Supply Design Guide for Desktop Platform Form Factors, v1.31)

1. update all references, and archive all documents via archive.org.
2. cleanup overview section.
3. add some history of ATX standards to provide some age of this connector being used for this purpose
4. fix categories at bottom of article before copying

Berg Electronics Corp (original manufacturer)

DuPont Connector Systems --> Berg Electronics --> FCI

Berg connector is a brand of electrical connector used in computer hardware. Berg connectors are manufactured by Berg Electronics Corporation of St. Louis, Missouri, a division of Framatome Connectors International.

Berg connectors have a 2.54 mm (=.100 inch) pitch, pins are square (0.64 mm x 0.64 mm = approx. 0.025 x 0.025 inch), and usually come as single or double row connectors.

Many types of Berg connectors exist. Some of the more familiar ones used in IBM PC compatibles are:

• the 4-pin polarized Berg connectors used to connect 3.5-inch floppy disk drive units to the power supply unit, usually referred to as simply a "floppy power connector", but often also referred to as LP4. This connector has a 2.5 mm pitch (not 2.54)!!
• the 2-pin Berg connectors used to connect the front panel lights, turbo switch, and reset button to the motherboard, and
• the 2-pin Berg connectors used as jumpers for motherboard configuration.

The power connector itself is a Berg connector, sometimes referred to as a Mini-Molex connector.

http://www.playtool.com/pages/psuconnectors/connectors.html

https://www.researchgate.net/publication/228206282_Berg_Electronics_Corporation

http://www.amphenol-icc.com/catalogsearch/result/?q=+BergCon%C2%AE

http://www.eetimes.com/document.asp?doc_id=1119494

http://www.fundinguniverse.com/company-histories/framatome-sa-history/

http://www.clintonnevada.com/burndy-lugs/

Berg ---> FCi ---> Amphenol FCi

Ergo MD-21 3.5" floppy drive user manual - shows 4pin power connector pinout drawing http://www.minuszerodegrees.net/manuals/Ergo/Ergo%20MD-21%20Micro%20Floppy%20Disk%20Drive%20-%20User%20Manual%20-%20Rev%202.1.pdf

• 4-pin Berg floppy connector — transferred directly from AT standard: +5 V and +12 V for 3.5 inch floppy drives and other peripherals.^[1]

http://www.molex.com/molex/products/family?key=disk_drive_power_connector&channel=products&chanName=family&pageTitle=Introduction

Molex 4-pin power connector - 5.25" hard drive - 5.25" CDROM drive (and DVDROM and writer drivers) - 5.25" floppy drive

Company names, such as Berg, Molex, JST, should not be used as alternate name for one specific connector, because each company sells numerous types of connectors.

Company: SIIG Part Number: JU-H42B22-S2 Product Name: Hi-Speed USB 4-Port Bay Hub Date: January 2013 http://www.siig.com/media/files/manuals/0012/04-0252e.pdf https://web.archive.org/web/20170720031804/http://www.siig.com/media/files/manuals/0012/04-0252e.pdf

Company: SYBA Part Number: SY-HUB20211 Product Name: 4 port USB 3.0 Hub Panel for 3.5" Floppy Bay Date: ??? http://www.sybausa.com/index.php?route=product/product&product_id=851 https://web.archive.org/web/20170720033407/http://www.sybausa.com/index.php?route=product/product&product_id=851

Part Number: BT-145 Product Name: BT-145 Internal Floppy Disk Drive Date: ??? http://byteccusa.com/index.php/bt-145-html.html https://web.archive.org/save/http://byteccusa.com/index.php/bt-145-html.html