Axial Optical Isolators provide isolation to 20 kV at 32 mm.

Press Release Summary:

Providing electrical isolation and data transfer, Series OPI1270 consists of visible LED emitter and phototransistor detector housed in separate opaque molded plastic housings and coupled by shrouded optical cable for noise immunity. LED emits red light with peak wavelength of 645 nm, while phototransistor exhibits max collector current of 50 mA. Offered in standard lengths of 32, 40, and 80 mm, RoHS-compliant units feature operating temperature of -20 to +85°C.

Original Press Release:

OPTEK Develops Axial Analog Data Transfer System for High Voltage Isolation Up To 20kV at 32mm

DALLAS, TX (April 5, 2006) - Providing design engineers with the ability to transmit data from one high voltage potential to another at varying distances, TT electronics OPTEK Technology has developed an axial optical isolator designed to provide electrical isolation and data transfer. Designated the OPI1270 Series axial analog isolator, the device consists of a visible red LED emitter and a phototransistor detector housed in separate opaque molded plastic housings and coupled by a shrouded optical cable that gives the device extremely high noise immunity. The isolators are offered with standard lengths of 32mm, 40mm and 80mm, and can be produced in custom lengths up to 10 meters or longer.

"The OPI1270 Series devices were designed for applications that require high voltage isolation between input and output or transmission of a signal from one location to another on the same or adjacent PC board," said Roland Chapa, OPTEK Technology's Assemblies Business Unit director. "The heavy-duty opaque housing and shrouded cable shields the optical signal from dust, dirt, oil and other particles, making the isolator ideal for contaminated environments."

The OPI1270 Series isolators are connected by a flexible optical cable in standard device lengths of 32mm (1.26"), 40mm (1.57") or 80mm (3.15"). With this design, the emitter does not have to be precisely optically aligned with the sensor housing, Chapa explained.

Applications for the OPI1270 Series isolator include industrial, medical, and office equipment, as well as electrical isolation circuits in harsh environments.

The OPI1270 Series isolators are rated for a minimum of 20kV isolation for the 32mm device, and carry a power dissipation rating of 100mW. The AlInGaP LED (emitter) emits red light with a peak wavelength of 645nm, with on-state collector current ranging from 0.9 to 1.5V (IF=20mA) and maximum collector dark current of 80mA (VR=3.0V).

The phototransistor (sensor) exhibits a maximum collector current of 50mA (VCE=10V, EE=0). Collector-emitter breakdown voltage is 33V (min.), and emitter-collector breakdown voltage is 5.5V (min.) (both measured at 100mA, EE=0). The current transfer ratio for the device is typically 10% with a LED current of 20mA.

The operating temperature range is -20°C to +85°C, and the device is also compatible with high temperature soldering processes of 260°C.

The OPI1270 Series isolators are RoHS-compliant. OPTEK will also produce devices to meet customer requirements, including custom electrical specifications, as well as special connectors or cabling configurations.

Typical pricing for the OPI1270-032 isolator starts at $4.97 each in quantities of 1,000 pieces, with samples available immediately. Production quantity lead times, if stock is not available, are from 6 to 8 weeks.

For samples of the OPI1270 Series or more technical information, contact TT electronics' OPTEK Technology at 1645 Wallace Dr., Carrollton, TX, 75006; call 972-323-2200, e-mail at or visit OPTEK on the web at In Europe, contact JP Delaporte at In Asia, contact T.H. Swee at or call +852-9190-4641.

OPTEK Technology is a leading manufacturer of standard and application-specific sensors using infrared, visible, magnetic and fiber optic technologies focused on applications in office machines, industrial equipment, encoders, automotive electronics, military and high-reliability applications, and medical diagnostic equipment. Headquartered in Carrollton, TX, the company is ISO/TS16949:2002 and BS EN ISO 9001:2000 certified, as well as ITAR registered. OPTEK Technology was acquired by TT electronics in December 2003.

TT electronics plc is a global electronics company manufacturing a broad range of advanced electronic components, assemblies and sensor modules for the automotive, industrial, telecommunication, computer and aerospace markets.

More from Electrical Equipment & Systems

All Topics