Toshiba Launches Dual Polarity Input Photocouplers for PLCs

Supports both sink and source logic input to achieve reduction of bridge circuits

TOKYO — (BUSINESS WIRE) — March 29, 2013Toshiba Corporation (TOKYO:6502) today announced the launch of high-speed photocouplers for programmable logic controllers (PLCs) which work with both plus and minus LED currents.

Toshiba Dual Polarity Input Photocouplers for PLCs (Photo: Business Wire)

Toshiba Dual Polarity Input Photocouplers for PLCs (Photo: Business Wire)

PLCs accept either sink logic input, used mainly in Japan, or source logic input, used mainly outside Japan. With globalization, bridge circuits are increasingly employed upstream from photocouplers used as PLC input interfaces, in order to provide support for both sink and source logic. The new photocouplers, the buffer logic type "TLP2395" and the inverter logic type "TLP2398", support both sink and source logic by combining two LEDs in inverse parallel, thereby allowing omission of the bridge circuits. Since there are cases where a single board will contain multiple bridge circuits, employing the new photocouplers can support reductions in circuit size, power consumption and cost.

The operating power supply voltage range of the new products supports a wide range, between 3V and 20V, and high-temperature operation is possible with an operating ambient temperature up to 125°C. The photocouplers support a data transfer speed of 5Mbps. With their wide operating power supply voltage range and temperature range, a propagation delay time under 250ns, pulse width distortion under 80ns and propagation delay skew of 130ns are guaranteed. These features make the new products suitable for communication interfaces (RS232C, RS422, RS485, etc.) in industrial applications. A low input current drive (2.3mA) and low supply current (3mA) are also realized, contributing to energy efficiency.

Programmable logic controllers (PLC), Factory automation (FA) devices

Main Specifications
1. Operating temperature range: Topr = -40°C to 125°C
2. Operating power supply voltage range: VCC = 3 to 20V
3. Threshold input current: IFHL / IFLH = 2.3mA (max)
4. Supply current: ICC = 3mA
5. Propagation delay time: tpHL / tpLH = 250ns (max)
6. Pulse width distortion:│tpHL-tpLH│= 80ns (max)
7. Propagation delay skew: tpsk = 130ns (max)

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Customer Inquiries:
Optoelectronic Device Sales & Marketing Department
Tel: +81-3-3457-3431

Information in this document, including product prices and specifications, content of services and contact information, is current on the date of the announcement but is subject to change without prior notice.

About Toshiba
Toshiba is a world-leading diversified manufacturer, solutions provider and marketer of advanced electronic and electrical products and systems. Toshiba Group brings innovation and imagination to a wide range of businesses: digital products, including LCD TVs, notebook PCs, retail solutions and MFPs; electronic devices, including semiconductors, storage products and materials; industrial and social infrastructure systems, including power generation systems, smart community solutions, medical systems and escalators & elevators; and home appliances.

Visit Toshiba's web site at


Toshiba Corporation
Semiconductor & Storage Products Company
Koji Takahata, +81-3-3457-3405
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