Dual-channel photocouplers offer PCB space savings of 40%

Toshiba Electronics Europe has expanded its family of miniature photocouplers with a range of devices that incorporate two switching channels in a single SO-8 package measuring just 5mm x 4mm. The new TLP21xx devices will significantly simplify the design and reduce the component count of applications requiring high-performance switching and optical isolation. They can also reduce PCB area by approximately 40% when compared with designs based on single-channel devices. The new TLP2105 and TLP2108 offer buffer and inverter logic outputs respectively, operate over a wide 4.5V to 20V supply voltage, and can be used in applications requiring typical data rates to 5Mbps. Targeted at higher speed, lower voltage applications, the TLP2116 and TLP2166A have inverter logic outputs, operate with respective supply voltages of 4.5V to 5.5V and 3.0V to 3.6V, and accommodate typical data rates up to 15Mbps.

All of the new devices have a rated isolation voltage of 2500Vrms and are guaranteed for performance across an extended -40dm;C to 100dm;C temperature range. Totem-pole output stages can source and sink current. Internal Faraday shields provide common-mode transient immunity of 15kV/s in the case of the TLP2166A and 10kV/s for the other couplers.

All of the new devices consist of a pair of GaAlAs infrared LEDs, which are optically coupled to integrated photodetectors. The high-speed of the TLP2116 and TLP2166A suits applications such as plasma display panels (PDPs), high-speed logic systems and factory automation interfaces. The TLP2105 and TLP2108 are ideal for designs requiring high-speed line receivers, isolated bus drivers and microprocessor system interfaces.