Rectifiers in SMD configuration increase in supply

Companies in the rectifiers line beef up the production of models in smaller packages, which now outnumber traditional DIP variants.

Surface-mount technology pervades electronic components manufacturing and continues to diminish the hold of the older through-hole method. In the rectifiers line in mainland China, SMD types have outstripped DIP units in production, with the former's share expected to rise further in coming years.

Shipments of SMD variants are projected to represent 60 percent in the next one or two years, while for some makers more than 80 percent is already a likelihood in 2018. At Changzhou Langjie Electronics Co. Ltd, which has been focusing on SMD variants, the category now accounts for nearly 80 percent of total deliveries for the line.

Makers complement this miniaturization-driven migration with efforts to ensure reliability in product design. On their agenda are ultrafast switching, low power loss, and high current capability and efficiency.

Chongqing Pingwei Enterprise Co. Ltd packs these features in its releases, including the ES3JG model. The unit has 3A average forward rectified current, 90A nonrepetitive forward surge current and 35ns maximum reverse recovery time. It operates in as low as -55 C to as high as 150 C.

Rectifiers are broadly adopted in consumer electronics, computers and peripherals, communication products and automotive electronics. These applications are forecast to bring the same sales growth, which has been exceeding 10 percent in past years, in 2018. Nell Power Semiconductor Co. Ltd is looking forward to a 15 percent boost in revenue in the months ahead.

There are more than 400 suppliers of rectifiers in the mainland. Most gather in the coastal electronics hubs, specifically the provinces of Guangdong and Jiangsu. Others are in inland areas such as the Chongqing municipality.

Domestic enterprises make up over 60 percent of the pool. Most continue to concentrate on the entry-level and midrange segments of the market to avoid competing with international players, including those with factories there.

Rectifiers account for 20 to 80 percent of companies' total shipments. The majority of suppliers are also engaged in the production of related categories such as transistors and ICs.

The mainland is the world's largest production base for rectifiers.

Common rectifier types

Widely adopted rectifiers in consumer electronics, computers and peripherals, communications devices and automotive electronics can be sourced in the mainland. These include Schottky barrier, fast-recovery and bridge kinds in DIP and SMD configurations.

By package size, the options are mainly SOD-123, SOD-323, SOD-523, SMA, SMB, SMC, SMAF, SMBF, MBF, MBS, ABS and ABF. The smallest units are in SOD-123FL.

The main materials and components in the manufacture of rectifiers are chips, plated lead used in terminals and thermoplastic for the cases.

Most makers turn to the local supply of inputs, while the chips generally come from foreign providers such as Toshiba and those from Taiwan.

In 2018, companies expect no further increases in the cost of materials and components, and project stable prices.

The products in this gallery have been handpicked by our market analyst for representing current trends in rectifiers from mainland China and Taiwan makers.

SMD rectifier with 1A maximum Io

Model A7 SMD rectifier from Changzhou Langjie Electronics Co. Ltd has 1A maximum average rectified current in the forward direction and 25A peak forward surge current. The maximum repetitive peak reverse and the maximum DC blocking voltage are 1,000V and the maximum RMS voltage 700V.

The unit has 4pF typical junction capacitance and 180 K/W typical thermal resistance. It operates in -55 to 150 C.

The minimum order is 120,000 units. Delivery is within 7 days.

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SMD rectifier has 3A Io

Chongqing Pingwei Enterprise Co. Ltd offers model ES3JG SMD rectifier with 3A average forward rectified current and 90A nonrepetitive forward surge current. The maximum recurrent peak reverse voltage and the maximum DC blocking voltage are 600V, and the maximum RMS voltage 420V. The unit supports -55 to 150 C operating temperature.

The 1,000-unit minimum order is delivered within 7 days.

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40 to 100A DIP rectifier

From Clion Electric Co. Ltd, SQL40-100A model is a DIP rectifier with 100 to 1, 600V and 40 to 100A ratings. Applications include various rectifying power sources, industrial automatic and remote control systems, and NC machines.

The maker requires an order of at least 100 units. Delivery lead time is 10 days.

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SMD rectifier has up to 5A peak reverse leakage current

This NST120D model from Nell Power Semiconductor Co. Ltd is an SMD rectifier with 5A maximum peak reverse leakage current. Its highest repetitive peak reverse voltage is 1,200 or 1,600V and the maximum nonrepetitive peak reverse voltage 1,300 or 1,700V.

Order quantity for the 30g unit is negotiable. Delivery takes 15 days.

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