Toshiba Launches a High Speed, Dual Polarity Input Photocoupler for Servo Motors and PLCs

Works with both plus and minus LED currents

TOKYO--Toshiba Corporation (TOKYO:6502) today announced that it has launched "TLP2391", a high-speed photocoupler for servo motors and programmable logic controllers (PLCs) which works with both plus and minus LED currents. Mass production is scheduled to start in December.

PLC applications accept one of two different polarity inputs: sink logic input and source logic input. The "TLP2391" supports both sink and source logic by combining two LEDs in inverse parallel, eliminating the need for a bridge circuit. The product supports 10Mbps high speed communications, twice as fast as other Toshiba dual input photocouplers1 allowing use in communications interfaces in industrial applications. The IC's 2.3mA low input current drive (@ VCC = 3.3V) and 1mA low supply current contribute to energy efficiency.


Programmable logic controllers (PLC), servo motors, and industrial automation equipment

Key Features of New Product

• Operating temperature: Topr = -40 to 125°C

• Supply voltage: VCC = 2.7 to 5.5V

• Supply current: ICC = 1mA

• Threshold input current:

IFHL = 2.3mA (VCC = 3.3V)
IFHL = 2.5mA (VCC = 5.0V)

• Propagation delay time: tpHL / tpLH = 100ns (max)

• Pulse width distortion: |tpHL-tpLH| = 30ns (max)

• Propagation delay skew: tpsk = 40ns (max)

[1]: Comparison with 5Mbps speed of Toshiba dual input photocouplers, "TLP2395" and "TLP2398".

For more information about the product, please visit:

Featured Product

PQ12-R Micro Linear Servo

PQ12-R Micro Linear Servo

The PQ12-R series of linear servos are the smallest affordable linear servo on the market today. Small enough to fit inside a tic tac box, it's very powerful with a maximum force of over 11lbs. It operates as a direct plug-and-play replacement for standard rotary servos, using the same standard 3 wire connector. Regardless of how you drive your servos, be it with an RC receiver, an Arduino board, or a VEX micro-controller, the PQ12-R servo will function in place of a regular servo, but with the added benefit of providing linear motion. They're available in a 20mm stroke coupled with gear ratio options of 30:1, 63:1 and 100:1 cover a large variety of applications. Our PQ12 is popular used in a variety of robotics applications, medical devices, radio control and 3D printable bionic hands. Our PQ12 is proudly designed in Canada by our in-house team of engineers and thoroughly tested before leaving our facility.