Five Engineers Talk About New Medium-Power Device ProductsPart 4 Power Diodes Achieve Improved Heat Dissipation Performance, Compactness through Adoption of PMDE Package

Good day, everyone. My name is Katagiri, and I’m with ROHM. This fourth article is about new power diode products adopting the PMDE package.

I’ll begin by briefly discussing the development background and history of the PMDE package. It goes without saying that demands for compact and energy-efficient electronic devices extend to all the components that make up the devices. Of course, this is true for diodes as well, and compact packages with better heat dissipation ability have been sought.

At ROHM, the PMDS package (DO-214AC/SMA package: 5.0×2.6×2.0 mm) and the PMDU package (SOD-123FL package: 3.5×1.6×0.8 mm) have long been used for power diodes with an average rectified current I_O of 1 to 2 A. In order to boost heat dissipation performance, ROHM has adopted the even more compact PMDE package (2.5×1.3×0.95 mm), to assemble a full lineup of diode products even more appealing than the previous models.

Fig. 1 PMDE package is far more compact even with the same current rating due to improved heat dissipation performance

The heat dissipation performance of the PMDE package is enhanced by a backside electrode structure, achieving heat dissipation comparable to the PMDU package that is currently the mainstream with an IO of approx. 1 A. As a result, while maintaining the dissipation characteristics of the PMDU package, it was possible to reduce the footprint by 40%. New Schottky barrier diode (SBD), fast recovery diode (FRD), and transient voltage suppressor (TVS) products adopting the compact, high-performance PMDE package were developed, and are here introduced.

Power Diode Products Adopting the PMDE Package

These are, at present, the power diode products that use the PMDE package; hereafter a broader variety of models will be offered. In future, compactness and higher efficiency will be pursued simultaneously, continuing product development leading to energy savings. They will meet your expectations.

Thank you for your time today.

＜Related Information＞

Advantages of PMDE Compact Package with High Heat Dissipation for Automotive SBDs
(https://fscdn.rohm.com/en/products/databook/applinote/discrete/diodes/pmde_in_sbd_automotive_an-e.pdf)