Low-profile aluminium electrolytic capacitor breaks energy density barriers

November 07, 2017 //By Graham Prophet
Cornell Dubilier’s THA and THAS Series Thinpack capacitors claim the highest-energy density available in low-profile aluminium electrolytic technology.

Describing the capacitors as a significant development in aluminium electrolytic technology, the company quotes dimensions of 8.2 mm, and 9mm, thick, respectively, for the 85ºC THA Series abd 105ºC THAS Series Thinpack capacitors. This is comparable in height to V-chip electrolytics, tantalums and board-mounted axials, yet offering much higher bulk-storage energy density. A single THA/THAS capacitor can replace an array of SMT, axial or radial aluminium electrolytic or solid tantalum capacitance arrays. That substitution can allow engineers to design smaller products with simplified assembly and higher reliability.

The new design of the THA/THAS Series design is based on the company’s 20+ years of experience with MIL-grade flat electrolytics. Re-engineered to be thinner and more cost effective, it is a good fit for many of today’s high-performance electronics. Unlike traditional cylindrical electrolytics, a THA/THAS capacitor has a sealed, laser welded aluminium case that eliminates the need for space wasting end seal gaskets. The design includes a valve to vent hydrogen gas, reducing swelling by relieving internal pressure.

In most applications, there are significant cost, weight and space savings vs. a comparably rated bank of SMT or axial aluminium electrolytic capacitors. This includes requiring about 70% less board space than alternatives, resulting in a reduction of overall size and weight of the finished board. The use of a single component versus many and fewer connections improves overall circuit reliability. The THA is rated at 3,000 hr. life @ 85 ºC; and the THAS is rated at 3,000 hr. life @ 105 ºC. Values from 140 µF @ 450 Vdc to 18,000 µF @ 10 Vdc, with 72 capacitance/voltage combinations. Distributors are on the company’s site at; www.cde.com/distributor-search – this information from US distributor New Yorker Electronics; www.newyorkerelectronics.com/Cornell_Dubilier_THA_ThinPack_Capacitors

CDE (Cornell Dubilier Electronics); www.cde.com/THA/THA.htm