Voltage protection devices: Combined ESD and EMI protection for audio equipment

• Excellent ESD protection capability according to IEC61000-4-2, level 4
• Suppression of TDMA noise generated by wireless communications
• Improved receiver sensitivity for wireless communications
• High permissible circuit voltage of 28 V DC for high power audio output

October 8, 2019

TDK Corporation (TSE:6762) has expanded its lineup of chip varistors with the new AVRF101U6R8KT242 for audio equipment, which offers both ESD and EMI protection. This product is intended for audio equipment that uses wireless communications in the 2.4 GHz band. Thanks to optimization of its capacitance of 6.8 pF, the multilayer component features high attenuation at this frequency and is able to effectively suppress the generated TDMA noise and thus improve receiver sensitivity. It offers excellent ESD protection according to IEC61000-4-2, Level 4 and has a maximum permissible circuit voltage of 28 V DC, making it suitable for high power class-D amplifiers. Key applications include smartphones, speakers and other wireless devices that operate in the 2.4-GHz band using wireless LAN and Bluetooth, for example.

Moving forward, TDK will continue to expand the product lineup in terms of chip sizes, bandwidth support range, and other specifications, in order to support a wide range of applications.

Glossary

• TDMA noise: Unpleasant audible noise generated by speakers when high frequency communication signals intrude into a microphone line
• IEC61000-4-2: International Electrotechnical Commission's immunity standard on ESD

Main applications

• ESD and EMI protection of audio equipment such as smartphones, speakers and other wireless devices that operate in the 2.4-GHz band using wireless LAN and Bluetooth

Main features and benefits

• Combined ESD and EMI protection
• Excellent ESD protection capability to IEC61000-4-2, level 4
• High permissible circuit voltage of 28 V DC

Key data

Type	Dimensions [mm]	Max. permissible circuit voltage [V]	Capacitance [pF]	Max. 2.4-GHz insertion loss [dB]
AVRF101U6R8KT242	1.0 x 0.5 x 0.5 (EIA0402inch)	28	6.8 pF ±10%	-20 max.

About TDK Corporation

TDK Corporation is a leading electronics company based in Tokyo, Japan. It was established in 1935 to commercialize ferrite, a key material in electronic and magnetic products. TDK's comprehensive portfolio features passive components such as ceramic, aluminum electrolytic and film capacitors, as well as magnetics, high-frequency, and piezo and protection devices. The product spectrum also includes sensors and sensor systems such as temperature and pressure, magnetic, and MEMS sensors. In addition, TDK provides power supplies and energy devices, magnetic heads and more. These products are marketed under the product brands TDK, EPCOS, InvenSense, Micronas, Tronics and TDK-Lambda. TDK focuses on demanding markets in the areas of information and communication technology and automotive, industrial and consumer electronics. The company has a network of design and manufacturing locations and sales offices in Asia, Europe, and in North and South America. In fiscal 2019, TDK posted total sales of USD 12.5 billion and employed about 105,000 people worldwide.

Contacts for regional media

Region	Contact		Phone	Mail
Japan	Mr. Yoichi OSUGA	TDK Corporation Tokyo, Japan	[phone]	[e-mail]
ASEAN	Ms. Jiang MAN Ms. Pei Lu LEE	TDK Singapore (Pte) Ltd. Singapore	[phone]	[e-mail]
Greater China	Ms. Clover XU	TDK China Co., Ltd. Shanghai, China	[phone]	[e-mail]
Europe	Mr. Frank TRAMPNAU	TDK Europe GmbH Duesseldorf, Germany	[phone]	[e-mail]
America	Ms. Sara M. LAMBETH	TDK Corporation of America Irving, TX, USA	[phone]	[e-mail]