Expanded lineup of small "PMDE packaged" diodes to support miniaturization of application products

The lineup of small 2.5mm×1.3mm "PMDE package" diodes (SBD/FRD/TVS) has been further expanded to help miniaturize application products

ROHM (headquartered in Kyoto, Japan), a world-renowned semiconductor manufacturer, has launched PMDE package (2.5mm×1.3mm) products to meet the needs of miniaturization of protection circuits and switching circuits in various applications such as automotive equipment, industrial equipment and consumer electronic devices. This time, 14 new models have been added to the product lineup.

Diodes are widely used for circuit rectification, protection and switching in a wide range of applications from automotive equipment to industrial equipment and consumer electronics. In order to reduce the mounting area, the package size of the diode is required to be reduced. In addition, in these applications, higher performance diodes are also required to reduce power consumption. On the other hand, when the package size of the diode is reduced, the back electrode and molded surface area are also reduced, resulting in poor heat dissipation. In response to this, ROHM's PMDE package improves heat dissipation performance by enlarging the back electrode and improving the heat dissipation path. While miniaturizing the package, it achieves the same electrical characteristics as conventional packages.

The PMDE package is ROHM's own small package with the same pad pattern as the ordinary SOD-323 package. By improving the back electrode and heat dissipation path, the same electrical characteristics (current, withstand voltage, etc.) as the ordinary SOD-123FL package (3.5mm×1.6mm) are achieved with a smaller package size, and the mounting area is reduced by about 42%, which helps to miniaturize the circuit board. In addition, the mounting strength is about 1.4 times that of the SOD-123FL package, which reduces the risk of cracks (product cracking) when the circuit board is subjected to stress, so the mounting reliability is higher.

This time, among the PMDE package products, 10 new models of RBxx8 series Schottky barrier diodes (hereinafter referred to as "SBD"), 2 new models of RFN series fast recovery diodes (hereinafter referred to as "FRD"), and 2 new models of VS series transient voltage suppression diodes (hereinafter referred to as "TVS") were added. Many uses in the circuit can be achieved by small-size diodes.

All new products have been put into mass production since January 2022 (sample price: 50 yen ~/piece, excluding tax), and samples can be purchased through e-commerce platforms such as Ameya360, Sekorm, RightIC, Oneyac, etc.

ROHM will continue to work hard to improve the quality of semiconductor components from low to high withstand voltages, and will continue to strengthen its distinctive product lineup to contribute to further miniaturization and lower power consumption of application products.

＜Features of PMDE packaging＞

1. Achieve the same performance as conventional packages in a small package

   
   

Typically, semiconductor components dissipate the heat generated when powered on into the air or onto a circuit board. However, when the package size is reduced, the back electrode and molding surface area are also reduced, making heat dissipation worse.

In response to this, the PMDE package has expanded the back electrode area and improved the heat dissipation path, changing the heat dissipation through the lead frame to direct heat dissipation to the circuit board. This greatly improves the heat dissipation performance, and can achieve the same electrical characteristics as the ordinary SOD-123FL package (3.5mm×1.6mm) with a smaller size (2.5mm×1.3mm), thereby reducing the installation area by about 42%, which is very suitable for automotive applications where the installation density of components is constantly increasing.

2. Ensure higher reliability than conventional packaging

The PMDE package achieves a mounting strength of 34.8N by increasing the area of ​​the metal part by enlarging its back electrode area, which is about 1.4 times that of the SOD-123FL package. This advantage reduces the risk of cracks (product cracking) when the circuit board is subjected to stress, which helps to improve reliability. In addition, by adopting a wireless structure that directly sandwiches the chip between the frames, it also achieves excellent surge current resistance (IFSM). Even in sudden high current conditions such as car engine startup and abnormal operation of home appliances, it is not easy to be damaged, and high reliability is guaranteed.

＜PMDE Package Product Overview＞

The PMDE package achieves the same electrical characteristics as the SOD-123FL package in a smaller size, and ensures superior heat dissipation performance and mounting reliability over the SOD-123FL package. In addition, models supporting automotive applications all comply with the automotive electronics reliability standard "AEC-Q101"*1. The following is an introduction to the featured product lineup using the PMDE package. (SBD: Only the RBR series will start mass production in June 2021.)

1. SBD: Features of RBxx8 series (new product)

SBD is a diode with low VF (forward voltage)*2 and high efficiency. This time, 10 new PMDE package products with a withstand voltage of 30V to 150V have been added to the RBxx8 series, which has ultra-low IR (reverse current)*3 characteristics and can operate stably even in high temperature environments.

・RBxx8 Series Product Lineup Table

2. SBD: Features of the RBR series (released in August 2021)

The RBR series achieves a good balance between low VF characteristics, which are key factors for improving efficiency, and low IR (reverse current) characteristics, which are trade-offs. Mass production began in June 2020. There are already 6 PMDE package models in the series.

・RBR series (PMDE package) product lineup

3. FRD: Features of RFN series (new products)

FRDs are diodes that have high withstand voltage (~800V) performance comparable to rectifier diodes and excel in trr*4 (reverse recovery time), a parameter that is important when operating at high frequencies. The RFN series achieves electrical characteristics comparable to conventional products in a compact PMDE package.

・RFN series (PMDE package) product lineup

4. TVS: Features of VS series (new products)

TVS is a diode used to absorb sudden voltage (surge*5) generated during engine startup or failure and reduce it to a certain voltage. The VS series supports a wide range of cutoff voltages (VRWM) from 5V to 130V. (The cutoff voltage can be set in 32 steps between 5V and 130V)

・VS series (PMDE package) product lineup

＜Application Examples＞

＜Terminology＞

*1) Automotive electronics reliability standard AEC-Q101

AEC is the abbreviation of Automotive Electronics Council, which is a reliability standard for automotive electronic components jointly developed by large automobile manufacturers and large electronic component manufacturers. Q101 is a standard for discrete semiconductor components (transistors, diodes, etc.).

*2) Forward voltage: VF (Forward Voltage)

The voltage drop generated when current flows from + to -. The lower the value, the higher the efficiency.

*3) Reverse Current: IR (Reverse Current)

The reverse current generated when a reverse voltage is applied. The lower the value, the smaller the power consumption (reverse power consumption).

*4) Reverse recovery time: trr (reverse recovery time)

The time required for a diode to go from the on state to the completely off state when switching. The lower this value, the lower the loss during switching.

*5) Surge

Sudden high voltage or high current. In different applications, surges may be caused by static electricity, lightning strikes, fluctuations when the engine starts, etc. When designing the circuit, it is necessary to equip it with a protection circuit that will not fail even in these situations.