High Power TVS Diodes for Exposed AC-DC Power

Bourns, Inc. today announced two new high-power TVS diodes that offer enhanced protection in surface-mount SMD packaging. The new diodes are designed for dc clamping in exposed ac-dc power supply applications such as wireless base stations. Designated Models PTVS3-058C-SH and PTVS3-076C-SH, the latest high current bidirectional TVS diodes from Bourns offer bidirectional port protection meeting IEC 61000-4-5 8/20 µs current surge requirements.

“Silicon technology in Bourns’ Power TVS devices delivers multiple advantages including lower clamping voltage under surge, greater performance stability and increased reliability compared to competing MOV technology that is typically used for dc clamping applications,” said Ben Huang, Product Line Manager at Bourns, Inc. “DC power supplies used in telecom and other exposed applications need protection against hostile events, such as power line surges and indirect lightning strikes to the power supply, by limiting the peak surge voltage to an acceptable level and by not short-circuiting the line for an extended period of time. Bourns Power TVS diodes are excellent solutions to satisfy these requirements that can help minimize critical system downtime and avoid costly maintenance calls.”

Bourns selected the SMD package for its latest Power TVS products because this type of packaging can simplify assembly and reduce manufacturing costs by eliminating the extra assembly step in situations where the Power TVS diode is the only through-hole component on the printed circuit board. These devices offer excellent surge response versus temperature, where the typical maximum surge current at 150 degrees C exceeds 70 % of their rated value at 25 degrees C. The new models also feature standoff voltage of 58 V and 76 V with a peak pulse current rating of 3 kA.

As a pricing reference, the Bourns Models PTVS3-058C-SH and PTVS3-076C-SH are priced at $23.51 each in 20 piece quantities and $21.70 each in 500 piece quantities. Both new Power TVS diode models are available now and are RoHS compliant.