Photo relays reduce mounting density to save equipment space, says Toshiba

Three photo relays from Toshiba Electronics Europe are claimed to be among the smallest voltage-driven photo relays available. The TLP3407SRA, TLP3475SRHA and TLP3412SRHA have a footprint of just 2.0 x 1.45mm and an extended operating temperature rating of 125 degrees C.

Raising the maximum operating temperature rating from 110 to 125 degrees C allows the photo relays to be mounted in high temperature areas and making it easier to secure required temperature design margins for equipment. The S-VSON4T package offers currently one of the smallest PCB mounting areas of 2.9mm² and is only 1.3mm high, claims Toshiba. The size will reduce PCB size or increase the number of photo relays in an existing layout in semiconductor testers, probe cards, burn-in equipment and other test and measurement equipment.

The TLP3407SRA features a very small on resistance (RON) of typically 0.2Ohm, and an on/off switching current up to 1.0A, which makes it suitable for switching applications in high-speed logic IC and memory testers, says Toshiba. It also has a low input power consumption of 3.3mW.

The TLP3407SRA has a built-in input resistance of 4000OhmΩ. The TLP3475SRHA and TLP3412SRHA built-in resistance is typically 600Ohm and eliminates the need for an external input resistor, to reduce the overall design footprint. All devices also offer a low off-state current of 1nA at 50V, and come with low output pin capacitance of 80pF (TLP3407SRA), 12pF (TLP3475SRHA) and 20pF (TLP3412SRHA).

Toshiba Electronics Europe (TEE) is the European electronic components business of Toshiba Electronic Devices and Storage Corporation. It offers European consumers and businesses a variety of innovative hard disk drive (HDD) products together with semiconductors for automotive, industrial, IoT, motion control, telecomms, networking, consumer and white goods. The company’s portfolio encompasses integrated wireless ICs, power semiconductors, microcontrollers, optical semiconductors, ASSPs and discrete devices ranging from diodes to logic ICs.

TEE has headquarters in Düsseldorf, Germany, with branch offices in France, Italy, Spain, Sweden and the United Kingdom providing design, manufacturing, marketing and sales.

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