Protect Electronic Devices From ESD Threats


Design engineers can now protect sensitive electronics devices from destructive electrostatic discharges (ESD) and lightning-induced surge. The new series of TVS diodes from Littelfuse are suitable for applications that include protecting HDBaseT, 2.5 and 5 Gigabit Ethernet, and 10/100/1000 Ethernet ports, as well as secondary protection for T1/E1, T3/E3, and high-end audio-visual equipment lines.

According to the press release an additional low capacitance diode is integrated with an additional zener diode to protect the I/O pins against the ESD and other surge events. The SP4044 and SP4045 Series TVS diode arrays are low capacitance, low clamping protection devices that can safely absorb upto 24A of lighting-induced  surges, as mentioned in the release. Adding further, it can also handle a minimum of ±30kV ESD for greater protection and product reliability.

The low loading capacitance also makes the SP4044 and SP4045 Series ideal for protecting high speed signal pins. “Straight-through” routing allows these components to sit on top of the lines they protect, eliminating stub parasitic capacitance and inductance and ensuring higher signal integrity, as stated in the news release.


Tim Micun, product manager for the TVS Diode Array line, said, “By allowing straight-through routing, they eliminate complicated trace capacitance calculations and data reflections, and support high signal integrity on the ultra-fast HDBaseT, 2.5 and 5 Gigabit Ethernet ports.”

The SP4044 and SP4045 Series TVS Diode Arrays are available in a 10-lead Mini Small Outline Package (MSOP-10) in tape and reel packaging, with a minimum order quantity of 4,000 units through authorised Littelfuse distributors worldwide, according to the company release.

SP4044 and SP4045 Series TVS Diode Arrays offer these key benefits:

  • Peak pulse power (500W for SP4044, 600W for SP4045) allows far more headroom against electrical threats as defined by regulatory standards
  • High ESD and lightning surge immunity allow manufacturers to achieve ESD protection above the maximum level stated in the IEC Standard and protect against a multitude of other threats to ensure product reliability in the field
  • Low capacitance (1.5 pF typical) preserves signal integrity and minimises data loss while offering a more robust device against electrical threats
  • Very low dynamic resistance (0.22Ω for SP4044, 0.3Ω for SP4045) produces low clamping voltages, allowing these devices to protect modern/small geometry chipsets against industry-defined ESD transients


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