In today’s electronics landscape, power connectivity may look simple on the surface, but it plays a fundamental role in the reliability of any device. From compact routers and portable speakers to smart home controllers and DIY development boards, stable DC power input remains a core requirement. Among various power interface options, DC power sockets continue to be widely used due to their straightforward structure, broad compatibility, and flexible mounting options.

A DC power socket is designed to connect an external DC adapter to an internal circuit system. It typically consists of a center pin contact, an outer sleeve contact (usually ground), insulating housing, and PCB mounting terminals. When the matching DC plug is inserted, the inner and outer contacts form a conductive path, delivering stable power to the device. Although the structure appears simple, different applications demand different sizes, mounting styles, and mechanical strengths.

The KH-DC-002-1.0 from Kinghelm is a through-hole, right-angle DC power socket designed for compact electronic equipment. It features a 1.0mm inner contact diameter and a 4.2mm outer diameter, with a unit weight of approximately 0.507g. The product complies with ROHS requirements, making it suitable for designs that prioritize material compliance and environmental considerations.

Kinghelm KH-DC-002-1.0 Product Image

Through-Hole and Right-Angle Mounting Structure

The KH-DC-002-1.0 adopts a plug-in (through-hole) package. Compared with surface-mount designs, through-hole DC sockets provide stronger mechanical anchoring to the PCB. This is particularly beneficial in applications where the connector may experience repeated insertion and removal or external cable pulling forces. The soldered pins pass through the PCB and are secured by wave soldering or manual soldering, enhancing structural stability.

Its right-angle (horizontal) mounting configuration allows the plug to be inserted parallel to the PCB surface. This layout is commonly used in devices where the power cable exits from the side of the enclosure. It helps optimize internal space arrangement and simplifies housing design, especially for compact consumer electronics and embedded systems.

Center Pin Diameter Options in the Market

When selecting a DC power socket, the center pin diameter is one of the most critical parameters. Common inner diameters in the market include 0.7mm, 1.0mm, 1.3mm, 1.65mm, 2.0mm, and 2.5mm. Outer diameters are often available in sizes such as 3.5mm, 4.0mm, 4.2mm, 5.0mm, and 5.5mm. Each size combination corresponds to different DC adapter plug standards and current-carrying requirements.

With a 1.0mm inner diameter and 4.2mm outer diameter, the KH-DC-002-1.0 is suitable for specific low- to medium-power DC adapter applications. This configuration is often used in compact electronics such as portable modules, small control boards, LED drivers, and lightweight smart devices. Engineers typically evaluate voltage rating, current demand, available PCB space, and enclosure constraints before finalizing the connector specification.

Materials and Structural Considerations

The performance of a DC power socket depends not only on dimensional accuracy but also on material selection and internal design. Contact terminals are commonly made of copper alloy to ensure good electrical conductivity. Surface plating treatments are applied to improve corrosion resistance and reduce contact oxidation over time.

The insulating housing is typically molded from heat-resistant engineering plastic to withstand soldering temperatures and long-term operational heat exposure. A well-designed internal spring structure ensures stable contact pressure between the plug and socket, contributing to consistent electrical connection during usage.

The KH-DC-002-1.0 is supplied in bag packaging, suitable for batch procurement and warehouse management. Its plug-in structure supports both manual assembly and automated wave soldering processes, making it adaptable to different production scales, from prototype builds to mass manufacturing.

Application Scenarios

DC power sockets like the KH-DC-002-1.0 are widely used across multiple industries, including:

• Small networking devices and communication modules

• Portable audio equipment and Bluetooth devices

• LED lighting controllers and power distribution boards

• Smart home control units

• Educational electronics and DIY development kits

As device designs continue to evolve toward compact and modular structures, power connectors must balance electrical performance with mechanical integration. Right-angle DC sockets offer practical flexibility for designers aiming to optimize board layout and enclosure alignment.

Product Range and Customization Options

In addition to the KH-DC-002-1.0, Kinghelm offers a variety of DC power connector models, including different inner and outer diameter combinations, vertical and horizontal mounting styles, and diverse pin configurations. This range allows engineers to select suitable models based on electrical requirements and mechanical layout.

For projects with specific structural demands, customization options may include adjusting terminal length, modifying housing height, or refining pin positioning to match unique PCB designs. Such flexibility can help streamline development cycles and reduce redesign efforts during product iteration.

Compliance and Industry Trends

Material compliance has become an essential consideration in electronic product development. The KH-DC-002-1.0 complies with ROHS requirements, supporting applications where regulated material standards are part of the design criteria. As electronic devices are distributed across various global markets, compliant components help facilitate smoother integration into finished products.

Conclusion

Although small in size, a DC power socket plays a crucial role in ensuring stable energy delivery within electronic equipment. selecting the appropriate inner diameter, outer diameter, and mounting style directly affects mechanical compatibility and electrical performance.

The Kinghelm KH-DC-002-1.0 combines a 1.0mm center contact with a 4.2mm outer diameter in a through-hole, right-angle configuration, offering a practical solution for compact DC-powered devices. With multiple size options available in the broader product range, designers have the flexibility to align connector choice with specific application needs and structural requirements.

About Kinghelm

Shenzhen Kinghelm Electronics Co., Ltd.（www.kinghelm.net）has technical backbones from Tsinghua University and UESTC, and has introduced overseas returnee professionals. Kinghelm is able to develop highly reliable and high-performance antenna and connector products.KH series products of "Kinghelm" brand include Beidou/GPS antennas, RF adapter connectors, plug connector, electrical data connectors, terminals, and customized vehicle harnesses, industrial / medical connectors, and special antenna connectors."Kinghelm connects world", Kinghelm has grown with the development of China's Beidou industry. Starting from supplying Beidou/GPS dual mode antennas, IPEX terminals, and RF adapter cables for automotive manufacturers, Kinghelm has continuously developed products. Currently, it has a series of WiFi, Bluetooth, NB-loT, LoRa, Zigbee, UWB, and GSM antennas, RFID tags, RF adapter cables, standard microwave antennas, vehicle grade SMA, SMB, FAKRA holders, coaxial cables, and can customize non-standard antenna connectors based on customer drawings or samples.