ESQT-120-03-G-D-390

Insulation Color:	Black
Contact Finish Thickness - Post:	3.00µin (0.076µm)
Contact Material:	Phosphor Bronze
Contact Shape:	Square
Insulation Material:	Liquid Crystal Polymer (LCP)
Applications:	--
Voltage Rating:	--
Current Rating:	4.5A per Contact
Features:	--
Ingress Protection:	--
Mated Stacking Heights:	--
Contact Finish - Post:	Gold
Material Flammability Rating:	UL94 V-0
Operating Temperature:	-55°C ~ 125°C
Contact Length - Post:	0.068" (1.73mm)
Insulation Height:	0.390" (9.91mm)
Series:	ESQT
Contact Finish Thickness - Mating:	20.0µin (0.51µm)
Contact Finish - Mating:	Gold
Fastening Type:	Push-Pull
Termination:	Solder
Mounting Type:	Through Hole
Row Spacing - Mating:	0.079" (2.00mm)
Number of Rows:	2
Pitch - Mating:	0.079" (2.00mm)
Number of Positions Loaded:	All
Number of Positions:	40
Style:	Board to Board or Cable
Contact Type:	Forked
Connector Type:	Elevated Socket
Part Status:	Active
Packaging:	Bulk

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The ESQT-120-03-G-D-390 from AMP is a rectangular mated pair, polarized connector consisting of a housing and contacts. It is part of the ESQT series of connectors and is commonly used as both a header and receptacle in a wide variety of electronic applications. Typically, the contacts are made of copper alloy, and a thermoplastic material is used for the housing.

Design & Operation

The ESQT-120-03-G-D-390 consists of a 2-piece mated assembly, which includes a male header with pins for connection and a female receptacle with sockets. This connector is fully polarized and coded in order to ensure proper mating, which also eliminates the possibility of misconnection. It can accept an open or closed-end wire or cables of various sizes and shapes. The design also includes a retaining clip for stabilizing board-to-cable connections, and the shell features 2 mounting posts on each side for secure mounting in various applications.The pins in the header are made of copper alloy with a gold-plated tin finish for enhanced electrical performance. The sockets in the receptacle are made of brass with gold-plated contacts. This connector offers a maximum contact resistance of 20mΩ, a minimum insulation resistance of 1000MΩ/DC1000V, and an operating voltage of up to 500V AC/DC.

Applications

The ESQT-120-03-G-D-390 connector is suitable for applications that require tight connections and secure mating between board-to-wire or board-to-cable components. Such applications include: test and measurement equipment, computer and network peripherals, telecommunications, consumer electronics, automotive electronics, medical electronics, and industrial control equipment.

Working Principle

ESQT-120-03-G-D-390 rectangular connectors work according to the following principle:When mated, the pins in the header and receptacle are in full contact. This ensures that a secure connection is established and power or signals can be transmitted through the connector. The electrical connection is then maintained by the built-in retention clip. The clip prevents the contacts from disconnecting even if pressure is applied from the outside.The pins in the header also have a gold-plated finish for enhanced electrical performance. The gold plating provides a low-resistance connection while also reducing the possibility of corrosion. The housings of the header and receptacle also help to protect the contacts from environmental damage. The thermoplastic material is resistant to most common solvents and chemicals as well as wear and tear. This ensures the connectors will reliably transmit power and signals for a long period of time.

Conclusion

The ESQT-120-03-G-D-390 connector from AMP is a highly reliable rectangular connector suitable for a wide variety of applications. The fully polarized design eliminates the possibility of misconnection, while the connection and mechanical stability of the contacts is ensured by the built-in retention clip. The gold-plated contacts and thermoplastic housing offer an ideal combination of electrical performance and environmental protection.

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