New Industry Products

Low Capacitance TVS Diodes Suitable for High-Speed Signal Lines

October 21, 2019 by Paul Shepard

Toshiba Electronic Devices & Storage Corporation has added two low capacitance transient voltage suppression (TVS) diodes (ESD protection diodes) that support high speed communication standards, such as Thunderbolt™ 3, HDMI® 2.1 and USB 3.1. The new DF2B5M4ASL supports a maximum working peak reverse voltage of 3.6V, and the DF2B6M4ASL supports 5.5V.

Tablets, laptop PCs and game consoles minimize transfer times for video data or large files by using 10Gbps or 48Gbps high speed communication standards. With the increasing miniaturization of the controller ICs used in these high-speed communications, ESD tolerances are decreasing, and it is necessary to enhance measures to counter ESD and surges from connectors; their lack can cause critical faults such as communication errors and file damage.

In addition, parts connected to high speed communication lines have a large effect on signals; passive parts on printed circuit boards, such as capacitors and resistors, can distort signal waveforms.

The new products reduce these influences with a lower capacitance suitable for high speed communications. In addition, by optimizing the process, the new products achieve a capacitance (typ.) of 0.15pF, about 25% lower than current products. This helps to realize stable circuits in high speed communications.


  • Low total capacitance: Ct=0.15 pF (typ.)
  • High electrostatic discharge voltage rating:
    • VESD= ±16kV (DF2B5M4ASL)
    • VESD= ±15kV (DF2B6M4ASL)
  • Small and surface mounting package: SL2 (Package code: SOD-962, 0.62×0.32×0.3mm (typ.))

Main specifications (click on table to enlarge)