Product category:
Circuit Protection Devices
News Release from: Optek Technology | Subject: OPI125/6/7/8 Series isolators
Edited by the Electronicstalk Editorial
Team on 08 November 2007
Optically coupled isolators for rugged
protection
Optically coupled isolators provide design engineers with a direct TTL/LSTTL interface with four output options - totem pole, open collector, inverse totem pole or inverse open collector.
Giving design engineers a rugged, hermetically sealed device capable of up to 15kV of input-to-output isolation voltage, Optek Technology has developed a series of optically coupled isolators incorporating the company's Photologic sensor technology Designated the OPI125/6/7/8 Series isolators, the devices consist of a GaAs infra-red LED coupled to a photodiode, a linear amplifier and a Schmitt trigger integrated on a single silicon chip
This article was originally published on Electronicstalk on 31 May 2005 at 8.00am (UK)
Related stories
Optically coupled isolators meet military needs
A new series of optically coupled isolators are surface mountable on ceramic or printed circuit board.
NPN phototransistors exhibit fast response times
TT Electronics' Optek Technology has developed a series of NPN silicon phototransistors in 1206 chip packages.
To achieve long-term stability, the diode and the sensor are hermetically sealed in separate packages and mounted within a high dielectric plastic housing.
"The OPI125/6/7/8 Series isolators provide design engineers with a direct TTL/LSTTL interface with four output options - totem pole, open collector, inverse totem pole or inverse open collector", says Alan Bennett, Vice President of sales and Marketing for Optek Technology.
"They are capable of driving up to eight TTL loads directly, without additional circuitry, at medium-speed datarates up to 250kbaud".
Further reading
Novel package makes more of LED output
Lednium Series devices are among the industry's brightest single-source packaged visible LED assemblies.
Phototransistors takes their lenses onboard
NPN phototransistors feature an integral lens that enables the devices to operate with higher performance at lower cost.
The series' four output options are: OPI125 (totem pole); OPI126 (open collector); OPI127 (inverse totem pole); and OPI128 (inverse open collector).
The isolators are recognised under UL Standard 1577 (File E58730) for 3750V AC at 100C.
Applications for the OPI125/6/7/8 Series isolators include industrial, medical and office equipment, as well as high voltage electrical isolation circuits in harsh environments.
The OPI125/6/7/8 Series isolators are rated for 15kV isolation and carry a power dissipation rating of 200mW.
The GaAs LED (emitter) emits a peak wavelength of either 890 or 935nm, with a forward DC current of 25mA.
The output Photologic photosensors operate with a 20mA supply current and a maximum low-level output voltage of 0.40V.
High-level output voltage (VOH) for the OPI125/7 totem pole logic devices is 2.4V (minimum); and high-level output current (IOH) for the OPI126/8 open collector devices is 100uA (maximum).
Typical rise and fall times for all the devices is 70ns, with typical low-high and high-low propagation delays of 5us.
The operating temperature range is -55 to +100C, and the device is also compatible with high temperature soldering processes of 260C.
The OPI125/6/7/8 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.
TX and TXV-level processing is also available.
Typical pricing for the OPI125/6/7/8 isolators is approximately US $6.73 in quantities of 25,000.
Production quantity lead times, if stock is not available, are from 6 to 8 weeks.
• Optek Technology: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
