TVS diode arrays protect smart watches and medical devices

Bidirectional discrete TVS diode arrays in the SP1026 series are designed specifically to protect sensitive electronic equipment from damage due to electrostatic discharges (ESD). Littelfuse uses Zener diodes fabricated using a proprietary silicon avalanche technology to protect each I/O pin to provide a high level of protection against ESD. The robust, general-purpose diodes can absorb repetitive ESD strikes at ±30kV (contact discharge, IEC 61000-4-2) without performance degradation, says the company. Each diode can dissipate 5A of 8 or 20micro sec surge current (IEC61000-4-5) with very low clamping voltages.

Applications include protection of mobile phones, smart phones, smart watches, tablets, portable navigation devices, and portable medical devices.

They are space-efficient, and fit into an 0201-size (0.60 x 0.30 to 5mm) footprint to save PCB space and reduce costs. Dynamic resistance is a low 1.4Ohm to support the low clamping voltages needed for protecting modern electronics filled with small-geometry ICs. The diodes protect to IEC 61000-4-2, ±30kV contact, ±30kV air discharge; IEC 61000-4-4, 40A (5/50ns) for lighting; IEC 61000-4-5 2nd edit, 5A to permit manufacturers to achieve ESD protection beyond the maximum level stated in the IEC standard, claims the company.

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