High-power surface-mount TVS diodes for exposed AC/DC PSUs

August 27, 2014 // By Graham Prophet
These transient suppression diodes from Bourns claim lower clamping voltage under surge, greater performance stability for increased reliability, and come in SMD packages to simplify assembly

Offering enhanced protection in surface mount SMD packaging, these 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 high current bidirectional TVS diodes offer bidirectional port protection meeting IEC 61000-4-5 8/20 μsec current surge requirements.

Bourns selected the SMD package for these 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°C exceeds 70% of their rated value at 25°C. The new models also feature standoff voltage of 58V and 76V with a peak pulse current rating of 3 kA.

“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.”

The PTVS3-058C-SH and PTVS3-076C-SH are priced at $23.51 each (20).

Bourns; www.bourns.com