Series:	--
Packaging:	Bulk
Part Status:	Active
Connector Type:	Jack
Gender:	Male
Industry Recognized Mating Diameter:	2.10mm ID (0.083"), 5.50mm OD (0.217")
Actual Diameter:	0.083" (2.10mm ID), 0.217" (5.50mm OD)
Number of Positions/Contacts:	2 Conductors, 3 Contacts
Internal Switch(s):	Single Switch, Normally Closed
Mounting Type:	Panel Mount, Through Hole
Mounting Feature:	Bulkhead - Front Side Nut
Termination:	Solder Eyelet(s)
Shielding:	Unshielded
Features:	Mounting Hardware, Thread Lock
Insulation Color:	--
Voltage - Rated:	30VDC
Current Rating:	5A
Mating Length/Depth:	0.476" (12.10mm)
Contact Material - Plating:	Silver
Body Material:	Copper Alloy
Operating Temperature:	-40°C ~ 65°C
Includes:	--
Housing Material:	Thermoplastic
Contact Material:	Copper Alloy
Thread Size:	5/16"-32
Body Color:	Red, Silver
Material Flammability Rating:	--
Ingress Protection:	--

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Barrel - Power Connectors

L721A application field and working principle

Barrel-power connectors, although not the most commonly used electrical connectors, are an integral part of many applications. It is a type of industrial electrical connector that is used to connect a power source to an electronic device, such as a laptop or computer monitor. The L721A is a barrel-power connector specifically for 2.1mm and 2.5mm inner-diameter power plugs. The L721A connector is a male, 4-pin, U-shaped inserted tower-type connector for DC power (unlike an AC power connector). All the pins are arranged on the same side. Inside the connector contain four pins, where two of the pins support the electrical signal, and two of the pins support the mechanical retainer. On the face of the plug, there is typically a depression at the center. This depression serves as a key to ensure the connector is inserted in the proper orientation. The application field of the L721A connector is extremely wide. It is commonly used in office settings for connecting 12V to 24V DC power supplies such a laptop or computer monitor. In industrial settings, the L721A connector may be used for powering pumps, motors, lights, or other electrical devices. The L721A connector is also used in the automotive industry for 12V to 24V direct current applications. In medical equipment, such as dialysis or heart monitoring machines, the L721A connector can be used to power the machines. The working principle of the L721A connector is quite simple. One side of the connector has the exposed pins while the other has a cavity for the receptacle of the power connector. When both connectors are mated, one end inserts into the other, making a secure connection. The pins on the exposed end are inserted into the receptacle to create a connection between the two points. This connection allows electricity to flow through the connector, powering the device that is connected. The L721A connector offers several advantages over other electrical connectors. For example, it is a metal-backed connector that creates a strong external seal, even when exposed to harsh fuels and oils. It also offers excellent insulation and contact reliability, even when connected to a high current. The connector is corrosion and impact resistant, making it well suited for industrial and automotive settings. Additionally, the L721A connector is relatively easy to install, making it a popular choice in modern applications. In conclusion, the L721A connector is an extremely versatile and reliable barrel-power connector. It is designed to provide excellent electrical insulation and contact reliability and is suitable for use in a broad range of applications. The connector’s ease of installation and its robust design make it a top choice for powering many types of electrical devices.

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Part Number	Manufacturer	Price	Quantity	Description