Toshiba Opens the Way to Longer Life Wearables and IoT Devices With New IC Chips

Minute, ultra-low quiescent current[1] load switch ICs yield huge performance improvements
KAWASAKI, JAPAN--(Business Wire/Korea Newswire) January 13, 2022 -- Toshiba Electronic Devices & Storage Corporation (“Toshiba”) has brought to market the “TCK12xBG Series” of load switch ICs that deliver a remarkable decrease in quiescent current[1] and an output current rating of 1A. Housed in a small WCSP4G package, the new ICs will support product developers in innovating a new generation of wearables and IoT devices that consume less power and offer a longer charge life. Volume shipments start today.

TCK12xBG Series uses a new driver circuit, which realizes a typical ON-state quiescent current of 0.08nA[1]. This represents in the region of 99.9% reduction from Toshiba’s current product, “TCK107AG,” a huge advance in efficiency that will allow wearables and IoT devices powered by small batteries to operate for significantly longer.

WCSP4G, a new package developed for the products, is about 34% smaller than that of TCK107AG, only 0.645×0.645mm, which allows mounting on small boards. Its back coating can reduce the damage that can happen to such a minute chip in the mounting process.

Toshiba has prepared a line-up of three ICs: TCK127BG with automatic discharge that turns on at active high; TCK126BG without automatic discharge that turns on at active high; and TCK128BG with automatic discharge that turns on at active low. This offers product developers and designers the freedom to select the load switch IC that best suits their design requirement.

Toshiba will continue to enhance low quiescent current technology products, to contribute to equipment downsizing and lower power consumption, and to a sustainable future.


· Wearables, IoT devices, smartphones (ON and OFF switch of power supply for sensors, etc.)
· Replacement of load switch circuits formed by discrete semiconductors such as MOSFETs, transistors, etc.


· Ultra-low quiescent current (ON state)[1]: IQ=0.08nA (typ.)
· Low standby current (OFF state): IQ(OFF)+ISD(OFF)=13nA (typ.)
· Compact WCSP4G package: 0.645×0.645mm (typ.), t:0.465mm (max.)
· Backside coating that reduces damage in board-mounting process

[1] Among load switch ICs with a compact package size of 1mm2 or less and an output current rating of 1A. Toshiba survey, as of January 2022.

Main Specifications

(To view the table, please visit

Follow the links below for more on the new product.

Follow the link below for more on Toshiba’s Load Switch ICs.
Load Switch ICs

To check availability of the new products at online distributors, visit:

Customer Inquiries
Small Signal Device Sales & Marketing Dept.
Tel: +81-44-548-2215
Contact Us

* Company names, product names, and service names may be trademarks of their respective companies.
* Information in this document, including product prices and specifications, content of services and contact information, is current on the date of the announcement but is subject to change without prior notice.

About Toshiba Electronic Devices & Storage Corporation

Toshiba Electronic Devices & Storage Corporation, a leading supplier of advanced semiconductor and storage solutions, draws on over half a century of experience and innovation to offer customers and business partners outstanding discrete semiconductors, system LSIs and HDD products.

The company's 22,000 employees around the world share a determination to maximize product value, and promote close collaboration with customers in the co-creation of value and new markets. With annual sales now surpassing 710-billion yen (US$6.5 billion), Toshiba Electronic Devices & Storage Corporation looks forward to building and to contributing to a better future for people everywhere.
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Media Contact: Toshiba Electronic Devices & Storage Corporation   Chiaki Nagasawa   Digital Marketing Department   +81-44-549-8361  
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