Marktech Optoelectronics has introduced a new generation of silicon photodiodes engineered to deliver precise spectral selectivity, high speed, and enhanced sensitivity for compact optical systems. Manufactured at the company’s Simi Valley, California facility and final-packaged in Japan through its collaboration with Optrans Corporation, the devices are designed to meet growing industry demand for photodetectors that offer both tuned wavelength performance and cost efficiency.
The new lineup features two near-infrared silicon photodiodes—the MTD3910GC-F3 and MTD3910G-F3—that provide minimal to zero sensitivity to visible light, enabling cleaner and more accurate detection around 940 nm. Both versions maintain high photosensitivity and fast response times thanks to their low junction capacitance and compact molded through-hole plastic packaging.
The two devices differ in their level of visible-light suppression: the MTD3910G-F3 offers enhanced filtering that delivers virtually no sensitivity below 775 nm, while the MTD3910GC-F3 eliminates responsiveness below 675 nm and shows only minute sensitivity in the 675–775 nm band. These characteristics make them suitable for short-run plastic fiber communications, security sensors, IR camera light sensing, medical oximetry and PPG systems, barcode scanners, optical rangefinders, and infrared laser monitoring.
Alongside the NIR-focused pair, Marktech has also unveiled the MTD5052D3, a silicon photodiode optimized specifically for blue-green detection with a peak responsivity at 525 nm. Like its NIR counterparts, it is built with a small active area and cost-effective molded packaging to ensure high-speed operation and low capacitance. The device is targeted at applications that rely on precise visible-light discrimination, including light-barrier safety sensors, optical switches, banknote and currency validation systems, fluorescence and spectroscopy equipment, and water-quality colorimetry.
Marktech emphasized that each photodiode undergoes detailed optical and electrical characterization, ensuring spectral fidelity and consistent performance across builds. Barry Jones, Silicon Detector Business Manager at Marktech, noted that engineers increasingly require detectors “tuned for their sensing band” that still deliver speed, low noise, and value. The company positions its new silicon photodiode family as a response to that need, pairing tightly targeted spectral behavior with the manufacturing oversight achieved through its U.S.–Japan production workflow.
