Extended series of snap-in power aluminium capacitors

Vishay Intertechnology, Inc. has extended its 193 PUR-SI series of miniature snap-in power aluminium electrolytic capacitors with new voltage ratings of 550V and 600V. The Vishay BCcomponents devices deliver up to 30% higher ripple current than standard solutions in similar case sizes and offer a longer useful life.

Traditionally, designers have used three 400V to 450V capacitors in series, with voltage balancing resistors across each device, to handle DC bus voltages up to 1100 V, an approach that adds design complexity and potential failure points. With their higher voltage ratings up to 600V, the enhanced series devices enable designers to achieve this voltage range with fewer components, while eliminating the need for voltage balancing circuits, saving PCB space and reducing BOM costs. Also, the added voltage headroom extends capacitor lifetimes and enhances overall system reliability.

Designed to withstand the demanding switching currents of today's high-power converters, the 193 PUR-SI series devices handle ripple currents up to 3.27A. Their long useful life of 5000 hours at +105C permits use in demanding applications requiring more than 25 years of operation from capacitors in ambient temperatures up to +60C. Featuring a cylindrical aluminium case insulated with a blue sleeve, the devices offer capacitance from 47µF to 820µF in 25 compact case sizes ranging from 22mm x 25mm to 35mm x 60mm. The RoHS-compliant capacitors are also available with three-pin keyed polarity snap-in terminals for more stable PCB mounting.

As polarised aluminium electrolytic capacitors with a non-solid electrolyte, the devices are ideal for smoothing, buffering, and DC-Link filtering in switch mode power supplies; chargers, BMS, and motor controls in EVs and HEVs; industrial motor drives and air conditioners; solar inverters; medical equipment; UPS; and welding equipment.