No, there isn't a connector type officially named "USB-D"; USB naming focuses on connector shapes (Type-A, Type-B, Type-C) and data standards (USB 2.0, USB4). The "D" in USB often refers to the D+ and D- data lines within older USB 2.0 connectors, but the modern successor to Type-C isn't expected to be called USB-D, with future advancements likely building on USB4 and Type-C.
D+ and D- is only for old-school QuickCharge or stuff like that. USB-C PD (Power Delivery), the proper modern standard, uses the CC1 and CC2 lines to communicate with the charger, the Data lines aren't needed (and sometimes not even present in charge-only cables).
The D-Type Battery Charger transforms the process of powering up your D-size rechargeable batteries into a straightforward and secure experience. The LED indicators display charging progress instantly while the device halts operation upon battery completion to avoid overcharging.
USB 4.0, which was released in August of 2019, is based on the Thunderbolt 3 protocol. It features up to 40 Gbps of data transfer and, with the more recent Power Delivery 3.1 standard, power transfer of up to 240 W. Thunderbolt 3 was a protocol developed by Intel in 2015 to support high speed data and video transfer.
Signal Waveform
The cable of USB has 4 wires; VDD, GND, signal D+, and signal D-. D+ and D- are complementary values each other for one transferred data. In the case that D+ is high and D- is low, the data is called “Differential 1”.
Lots of new devices utilizing USB for either data transfer or power have made the transition to the USB-C port. And yet USB-A and USB-B are still out there.
Why is everything USB-C now? USB-C is becoming the standard because of its faster data transfer, higher power delivery, and universal compatibility.
USB 3.0 was released almost 20 years ago in 2008 and it was the third major revision to the USB standard. It was a big improvement from USB 2.0 which first arrived in 2000 with transfer speeds of only 480 Mbit/s.
The USB Type D connector coincides with version 4.1 of the USB standard, with a theoretical maximum transfer rate of 1Tb/s. Devices can request up to 1.21GW of power, provided the host's power supply has sufficient capacity.
Even though AC charging is more popular, a DC charger has more advantages: it's faster and feeds power directly to the vehicle's battery. This method is common near highways or public charging stations, where you have limited time to recharge.
The symmetrical connection is also smaller and more user-friendly, as it's reversible and works with smartphones and tablets. I get that USB-C is inevitable, but tech brands should realize that the ubiquitous USB-A isn't going anywhere soon and stop removing the ports we need to run our devices.
Yes, a 30W charger generally charges devices faster than a 20W charger because it delivers more power, but the speed difference is often minimal for smartphones that don't need the extra wattage, though it's more noticeable for devices that can draw higher power like iPads or larger tablets, and the benefit is biggest in the initial charging phase (0-80%). For a device that only supports up to 20W, it will charge at 20W with either charger, but a 30W charger provides headroom for faster charging on compatible devices.
Yes, you can generally use a 90W charger for a device that uses a 65W charger because the device will only draw the power it needs, but you must ensure the voltage (V) and connector are identical, as using the wrong voltage or plug can cause damage. A higher wattage simply means the charger can supply more power, not that it forces more power into your device.
What is USB 4.0? USB 4.0 is the latest specification or version of USB that's housed within the USB Type-C cables. It takes over from USB 3.2 and 3.0 and offers either 40 Gb/s or 20 Gb/s of data transfer speed. Just like Thunderbolt 4, it uses the same Type-C reversible and rounded connector.
USB 2.0 remains highly relevant due to its cost-effectiveness and simplicity. Not every device requires ultra-fast data transfer; many just need reliable connectivity or power. USB 3.2 and USB4 can waste valuable resources if the extra bandwidth is not needed.
USB 3.2 expands upon the two-lane functionality of its predecessors in order to enable a peak data transfer rate of 20Gbps, effectively doubling the performance of USB 3.1 Gen 2. Additional protocol updates in USB 3.2 also help deal with latency and bandwidth overheads.
As Apple explained during its iPhone 12 event a few years ago, excluding the power adapter reduces the size of the box. The move is part of a commitment Apple made in 2020 to be 100% carbon neutral for its supply chain and products by 2030.
In 2022, the European Parliament and member states voted overwhelmingly in favour of scrapping alternative charging methods, meaning that all small and medium-sized portable electronic devices sold in the EU must be compatible with USB-C ports.
USB C is extremely fragile due to its size and not much can be done to help it. USB C might be created to withstand more insertion cycles. After all it is meant to be used for devices like phones that are plugged in and out constantly.
As well as the cybersecurity risks posed by plugging in USB drives, they also lack built-in security features. While USB drives can be encrypted to protect the data held within, most people do not know how to do this, or simply neglect to.
Purple ports indicate Huawei SuperCharge or USB 3.1
This connection, also known as USB 3.1 Gen 1, is one of the current standards in the USB framework, offering strong data speeds and general-purpose compatibility.
Apple switched to USB-C primarily due to a European Union (EU) law mandating a common charger for most portable electronics by late 2024, forcing compliance globally to avoid separate EU-only products. This change also simplifies connectivity, reduces e-waste, and aligns iPhones with Apple's other devices (Macs, iPads) and the broader tech industry's universal standard for faster data transfer and power delivery, making chargers interchangeable with Android devices.