August 20, 2014, Seoul — STMicroelectronics (ST), a global semiconductor company contributing to customers across a wide range of electronic applications, announced that it has begun limited production of EnFilm™, an advanced rechargeable battery less than 0.25 mm thick. This paper-thin battery not only solves the concerns of developers who have previously faced constraints such as standard battery sizes but is also ideal as a power source for next-generation personal devices and Internet of Things products.

ST's EFL700A39 EnFilm™ solid-state lithium thin-film battery is 220µm thick and measures 25.7mm x 25.7mm, making it highly suitable for ultra-thin devices. It can be attached directly to a circuit board via surface-mount terminals, simplifying assembly and eliminating the need for wires or connectors. High-speed automated placement is also possible with the optional tape-and-reel packaging.

The EFL700A39 has a nominal voltage of 3.9V and a capacity of 0.7mAh, allowing it to power a wide range of applications. This lithium battery is rapidly charged via a 4.2V charging circuit, has low capacity loss, and has a long product life cycle, allowing it to be used for about 10 years if charged once a day.

The EFL700A39 is RoHS compliant and UL certified, and meets the UN battery transport test and standards, IEC 62133 safety specifications, and ISO7816/IEC10373 mechanical and flexibility standards for smart cards.

ST has completed preparations for receiving orders for engineering samples and small-batch production, and is targeting applications such as wireless sensor nodes, RFID tags, smart cards, wearable technology, non-implantable medical monitors, and backup devices or storage for energy capture devices.