Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn

OP520/OP521 Series NPN Phototransistors
Nov 2005
Optek Technology, Industrial Sensing & ControlRequest Info
CARROLLTON, Texas, Nov. 9 —- TT electronics' Optek Technology, a maker of application-specific sensors, has developed a series of NPN silicon phototransistors in 1206-chip packages to provide design engineers with a miniaturized surface-mount device for infrared (IR) detection in sensing applications. Designated the OP520/OP521 series, the devices exhibit response times of 15 µs with peak response to 880-nm wavelength light.

“Design engineers working with IR sensing systems now have the option of using these miniature surface-mount photodetectors, enabling them to put the sensors virtually anywhere in their systems,” said Dave Birtalan, vice president of Optek Technology’s components business unit. “Their fast response times and high sensitivity make them ideal for machine automation applications, miniature optical encoders, and other high-speed non-contact-position sensing systems.”
The OP520 and OP521 series devices are silicon NPN phototransistors designed to detect 880-nm wavelength IR light. Both devices are packaged in a 1206 chip with a flat molded lens; the OP520 features an opaque lens to shield it from ambient light, while the OP521 lens is water clear, giving it a wider response range.

According to Birtalan, the IR detectors are part of a major expansion of Optek’s surface-mount IR components, which will include IR LEDs and silicon NPN phototransistors in 0805 and 1206 chip-size packages; 1.9 mm plastic packages and PLCCs (plastic leadless chip carriers) in a variety of mounting styles and lensing options.

Electrical performance of the OP520/521 series is characterized at collector-emitter voltages of 30 V, emitter-collector voltage of 5 V, collector current of 20 mA and power dissipation of 75 mW at 25°C. They are RoHS-compliant, as well as compatible with high temperature (260 °C) lead-free soldering processes and are rated for operation from -25 to +85 °C.

The OP520/521 series are designed to be mechanically and spectrally matched to Optek’s OP250 series surface-mount IR LEDs. Typical pricing for the OP520/OP521 series phototransistors starts at 20 cents each in quantities of 1000 pieces, with samples available immediately. Production quantity lead times are from stock or, if not available in stock, within eight weeks.

For samples of the OP520/521 sensors or more technical information, visit:; e-mail:

Optek Technology
1645 Wallace Dr.
Carrollton, TX 75006
Phone: (972) 323-2200


* Message:
(requirements, questions for supplier)
Your contact information
* First Name:
* Last Name:
* Email Address:
* Company:
Address 2:
Postal Code:
* Country:
Phone #:
Fax #:

Register or login to auto-populate this form:
Login Register
* Required
infraredIR phototransistorOP520/OP521 seriesOptekoptoelectronicsProductsSensors & DetectorsSMDsurface mountTT electronics

Terms & Conditions Privacy Policy About Us Contact Us
back to top

Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media
x We deliver – right to your inbox. Subscribe FREE to our newsletters.
Are you interested in this product?
If you'd like Optek Technology, Industrial Sensing & Control to reach out to you with more information about this product, please supply your email and they will contact you.

Email Address:
Stop showing me this for the remainder of my visit