Expanded Lineup of ROHM’s Compact PMDE Package Diodes (SBD/FRD/TVS): Contributing to Application Miniaturization

Superior reliability ideal for automotive applications.

Expanded Lineup of ROHM’s Compact PMDE Package Diodes (SBD/FRD/TVS): Contributing to Application Miniaturization.

ROHM added 14 new models to its PMDE package (2.5mm × 1.3mm) lineup – meeting the requirements for smaller protection and switching circuits. (RBxx8 Series, RFN Series, VS Series)




Diodes are used for rectification, protection and switching circuit in a wide range of applications such as automotive, industrial, and consumer fields. Additionally, there is an increasing need to reduce package size to minimize mounting area. At the same time, higher performance is required to reduce power consumption.

However, when decreasing package size the surface area of the backside electrode and mold also becomes smaller, resulting in lower heat dissipation. To solve this disadvantage, ROHM’s PMDE package improves heat dissipation performance by expanding the backside electrode and optimizing the heat dissipation path.

This achieves the same electrical characteristics as those of conventional packages in a smaller package size.

ROHM’s proprietary compact PMDE package features a land pattern equivalent to that of the conventional SOD-323 type. Reviewing the backside electrode and heat dissipation path allowed ROHM to achieve the same electrical characteristics (i.e. current, withstand voltage) as the standard SOD-123FL package (3.5mm × 1.6mm) in a smaller package size, contributing to board miniaturization by reducing mounting area by approximately 42%. Furthermore, mechanical strength is around 1.4 times higher than that of the SOD-123FL, reducing the risk of solder cracking when stress is applied to the board, ensuring greater mounting reliability.

The PMDE package lineup consists of 8 models in the RBxx8 series of Schottky barrier diodes (SBDs), 2 models in the RFN series of fast recovery diodes (FRDs), and 2 models in the VS series of transient voltage suppressors (TVSs). A variety of circuit applications can be achieved with compact diodes.

Going forward, ROHM will strive to further improve quality of its semiconductor devices, from low to high voltages while strengthening its distinctive lineup to further reduce power consumption and achieve greater package miniaturization.




PMDE Package Products
The PMDE package offers the same electrical characteristics as the conventional SOD-123FL package in a smaller package size with ensuring better heat dissipation performance and mounting reliability. In addition, all automotive-compatible part numbers are qualified under the AEC-Q101 standard for automotive reliability. Our new lineups of PMDE package products are listed below. (SBDs: RBR series only, in mass production from June 2021)

1. SBDs: RBxx8 Series Features (New Products)
These SBDs deliver low VF together with high efficiency. 10 models in the PMDE package with breakdown voltages from 30V to 150V have been added to the RBxx8 series that provide ultra-low IR (reverse current) and can operate stably even in high temperature environments.

RBxx8 Series Lineup Table



2. SBDs: RBR Series Features (Announced in August 2021)
The RBR series balances the trade-off relationship between low VF which is key to improving efficiency and low IR (mass produced since June 2020), 6 models in the series are available in the PMDE package.

RBR Series (PMDE Package) Lineup Table



3. FRDs: RFN Series Features (New Products)
FRDs provide high withstand voltage (up to 800V) equivalent to rectifier diodes along with excellent trr (reverse recovery time), which is important for high frequency operation. The RFN series offers the same electrical characteristics as conventional products in a compact PMDE package.

RFN Series (PMDE Package) Lineup Table



4. TVS: VS Series Features (New Products)
TVS is a type of diode that absorbs the sudden voltage (surge voltage) that flows during engine startup or breakdown, then steps down to a constant voltage. The VS series supports a wide range of standoff voltages (VRWM) from 5V to 130V.

(32 ranks of standoff voltages are offered between 5V and 130V)

VS Series (PMDE Package) Lineup Table



Availability: In mass production, through online distributors Digi-key, Mouser, and Farnell AG.

Application Examples












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