TVS Device Protects NFC & RF Interfaces


Semtech announced a high-performance, ultra-low capacitance transient voltage suppression (TVS) device to protect sensitive electronics from ESD including Near Field Communication (NFC) lines, RF signal lines, cellular handsets, tablets and FM antenna.

The single-line RClamp1851ZA is said to achieve the industry’s lowest clamping voltages and delivers optimal transient protection for NFC resonator and radio frequency (RF) interfaces. The combination of small size and high ESD surge capability makes it ideal for use in portable applications such as cellular phones, digital cameras and tablet PC’s.

The RClamp1851ZA features a low, typical dynamic resistance, which minimises harmonic distortion, as well as best in class, low ESD peak clamping voltage to prevent punch through failures during an ESD event. It is housed in an ultra-small, fully encapsulated package, which provides flexibility in circuit design and eases PCB layout. To extend battery life of its end-user applications, the device features low reverse leakage current of <1nA (typical).


“With the fast adoption of electronic payment systems on portable devices, such as smartphones and smart watches, protecting the NFC circuits on these devices ensures reliable operation and enhances user experience,” said Rick Hansen, Product Marketing Director for Semtech’s Protection Products. “The RClamp1851ZA expands Semtech’s RF protection product family and offers electronics engineers the high reliability and high-performance in ESD protection that Semtech is known for.”

Key Features of the device include:

  • Transient protection for high-speed signal lines: IEC 61000-4-2 (ESD) ±20kV (air), ±17kV
  • 18V working voltage protection for NFC resonator and other RF circuits
  • Low insertion loss: less than 0.5 dB below 5 GHz operating frequency
  • Ultra-small package size: 0.6mm x 0.3mm with nominal height of only 0.25mm
  • Low capacitance: 0.35pF at VR=0V
  • Low typical dynamic resistance: 0.16 Ohms


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