The UHS-II-compatible SD card socket
The UHS-II-compatible SD card socket
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Honda Tsushin Kogyo Co Ltd (HTK) announced Aug 22, 2013, that it has developed a double-sided metal socket supporting the "UHS-II" high-speed (312MBps or 2.496Gbps) SD card standard.

HTK will start to ship samples of the socket in October 2013 and will mass-produce and release it in December 2013. It plans to produce 500,000 units per month in 2015. The price of the sample is ¥500 (approx US$5.06).

The capacities of SD memory cards have been increasing. For example, the "SDXC" standard, whose maximum capacity is 2 Tbytes, was established in 2009. And 64-Gbyte products supporting the SDXC hit the market in 2010.

In such circumstances, there has been a strong demand for a higher data transmission speed for the purpose of reducing data transmission time. Therefore, the UHS-II was established. The maximum bus speed of the UHS-II is 312MBps (2.496Gbps), which is three times faster than that of the current "UHS-I" (104MBps or 832Mbps).

However, as transmission speed increases, it becomes necessary to address the problems of generated electromagnetic noise and heat. So, HTK employed its own "double-sided metal shell structure," which covers even the parts-mounted area of the printed circuit board (PCB) with a metal plate.

In addition, HTK increased the number of grounding points from two to six, compared with its previous product. As a result, it became possible to reduce electromagnetic noise by 20% and the temperature inside a card by 8°C, compared with a socket having the "one-sided metal shell structure," which uses plastic for the area contacting a PCB, the company said.

HTK mass-produces its SD card socket having the double-sided metal shell structure at a monthly production rate of about one million units for high-end digital single-lens reflex (SLR) cameras and auto accessories because it has high durability and long-term reliability. The UHS-II-compatible socket will be employed for high-end digital SLR cameras and digital camcorders that require high-speed data transmission speeds and high-end personal computers that are used for processing images and movies taken with the cameras and camcorders, the company said.

For a start, HTK plans to mass-produce two surface-mounted models of the new socket. One of them is a "standard type," which attaches SD card pins on the side of a PCB. And the other is a "reverse type," which attaches SD card pins on the other side of a PCB.

Also, the company intends to mass produce dual-inline-package (DIP) products at an early date after the volume production begins. It will produce the new socket in Japan. And all of the types can be assembled with a set of automated equipment, it said.