SMT (Surface Mount Technology) DC power jacks are essential components in many electronic devices, providing a reliable way to connect and power up gadgets. As a supplier of SMT DC power jacks, I often get asked about the common sizes in the market. So, let’s dive right in and have a look at these typical dimensions. SMT DC Power Jacks

Most Popular Standard Sizes
First off, on top of the list is the 2.1mm x 5.5mm size. This is like the "go – to" size in the industry. It’s been around for ages, and you can find it in a ton of devices. Laptops, small power adapters, and even some DIY electronics projects use this size. The outer diameter of 5.5mm and the inner pin diameter of 2.1mm create a stable connection. It can handle a good amount of current, usually up to a few amps, depending on the specific design. This makes it suitable for powering devices that need a decent power supply.
Another common one is the 1.7mm x 4.0mm. Smaller than the 2.1mm x 5.5mm, this size is often used in more compact electronics. Think about portable media players, small routers, or some handheld gaming devices. The smaller dimensions allow the manufacturers to save space on the circuit board. Even with its smaller size, it can still provide a reliable power connection, but the current – handling capacity is generally lower compared to the 2.1mm x 5.5mm jacks.
Miniature and Micro Sizes
There are also some really tiny sizes that are becoming more popular. The 1.3mm x 3.5mm jack is one such example. With the trend of making electronics smaller and more portable, this size has found its place in things like earbud chargers, small Bluetooth speakers, and smart watches. It’s super compact, but it still manages to hold up as a power – delivery solution.
And then we have micro – sized SMT DC power jacks. These are even smaller than the 1.3mm x 3.5mm ones. They’re often less than 1mm in the inner pin diameter and around 2 – 3mm in the outer diameter. These micro – jacks are used in ultra – small devices, such as some medical wearables or the tiniest of IoT (Internet of Things) sensors. They require very precise manufacturing processes to ensure a proper connection, but they’re crucial for the development of these miniaturized electronics.
Custom Sizes
Now, not all applications can use the standard sizes. Sometimes, device manufacturers need something special. That’s where we come in as a SMT DC power jacks supplier. We can produce custom – sized jacks according to the client’s requirements. For example, if a new type of high – end camera needs a unique power jack to fit its specific internal layout, we can design and manufacture it.
Custom sizes can vary in all aspects, from the inner and outer diameters to the overall height of the jack on the circuit board. We work closely with the clients to understand their needs, and then use advanced manufacturing techniques to create the perfect power jack. This might involve using different materials, adjusting the plating thickness, or changing the contact design to meet the specific electrical and mechanical requirements.
Factors Affecting the Choice of Size
When it comes to choosing the right size of SMT DC power jack, there are several factors to consider.
The power requirements of the device are a big one. If a device needs a high – power supply, a larger – sized jack like the 2.1mm x 5.5mm might be necessary. This is because larger jacks can handle more current without overheating. On the flip side, if the device only needs a small amount of power, a smaller – sized jack will do the job just fine and save space on the circuit board.
The physical space available on the circuit board also plays a huge role. In modern electronics, every millimeter counts. So, if the board is really crowded, a smaller – sized jack will be preferred.
The compatibility with other components in the device is another factor. The power jack needs to work well with the power supply unit, the battery (if there is one), and other electrical parts. Sometimes, a particular size is chosen just because it’s more compatible with other standard components in the market.
Quality and Reliability
No matter what size of SMT DC power jack you choose, quality and reliability are key. At our company, we take these aspects very seriously. We use high – quality materials in the manufacturing process. The contacts are made of materials that have good conductivity and corrosion resistance, so they can last a long time.
We also have strict quality control measures. Every single power jack goes through a series of tests before it leaves our factory. These tests include electrical performance tests, mechanical durability tests, and environmental tests. We want to make sure that our power jacks can withstand the rigors of real – world use, whether it’s in a hot and humid environment or a high – vibration setting.
Why Choose Us as Your Supplier
As a supplier of SMT DC power jacks, we have a lot to offer. We’ve got a wide range of standard sizes in stock, so you can get your hands on the power jacks you need right away. And if you need a custom size, we have the expertise and facilities to make it happen quickly.
Our prices are competitive. We understand that cost is an important factor for our clients, so we work hard to keep our production costs down without sacrificing quality.

We also provide excellent customer service. Our team is always ready to answer your questions, whether it’s about the technical details of our power jacks or the ordering process. We’ll work with you to find the best solution for your specific needs.
SMT DC Power Jacks If you’re in the market for SMT DC power jacks, whether it’s the common sizes or a custom – made one, don’t hesitate to get in touch with us. We’re here to help you power up your electronic devices with reliable and high – quality power jacks. Just reach out to us for a quote and let’s start the conversation about your procurement needs.
References
- "Electronics Component Handbook", a general guide on various electronic components including power jacks.
- Industry reports on the trends of SMT DC power jack sizes and applications.
Cixi Yingda Electronics Co., Ltd.
As one of the most professional smt dc power jacks manufacturers and suppliers in China, our products have good reputation in the market. Please rest assured to wholesale high quality smt dc power jacks for sale here from our factory.
Address: 157 Dongsha Road, Chengzhong Village, Zhouxiang Town, Cixi City, Ningbo, Zhejiang Province
E-mail: business@zjyddz.com
WebSite: https://www.zjyddz.com/