Optoisolators—also called optocouplers or photoisolators—are widely used to provide galvanic (ohmic) isolation of digital-signal inputs and outputs in industrial environments, as well as in other applications. The Toshiba TLP2363 is a high-speed (10 Mb/s) logic-level output photocoupler for the 24-V digital inputs often associated with programmable logic controller (PLCs) and other measurement and control equipment.
The device requires a supply current of just 4 mA and a threshold input current (IFHL) of 0.3 mA (minimum) and 2.4 mA (maximum) to ensure conformance to the digital input standard IEC 61131-2 type 1. The short propagation delay of just 80 ns is commensurate with high-speed systems and data rates.
Although isolation voltage rating is partially a function of physical size and thus internal input/output physical separation as well as package-pin creepage and clearance, the TLP2363 offers a minimum isolation-voltage rating of 3750 Vrms. This despite being housed in a small, thin SO6 package with five actual pins (pin 2 is absent) and with a maximum height of 2.3 mm. By using the common six-pin optocoupler footprint, it can be a drop-in replacement for existing optocouplers from many vendors (see figure).
The TLP2363, which meets a long list of relevant regulatory standards, incorporates an internal Faraday shield to guarantee common-mode transient immunity of ±20 kV/µs and is rated for a wide operating temperature range of−40 to +105°C). The detailed, 18-page datasheet offers numerous min/max/typical values for key parameters as well as graphs defining performance across a range of factors.