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Two new families of planar diffused ultraviolet photodiodes from OSI Optoelectronics are now available from 798%%AMS Technologies: the UV-EQ/EQC/EK and the UV-DQ/DQC/DK series. The silicon is processed for enhanced responsivity over 200 to 400 nm and guaranteed sensitivity down to 190 nm. Both series are sensitive down to 320 nm with suppressed response in the near-infrared region. Featuring metal or ceramic packaging and a quartz or borosilicate window, the devices can be reverse-biased for applications requiring lower capacitance, faster response or a wider dynamic range. They are available in a hermetically sealed package at lower cost and are suitable for spectrophotometers and analytical and medical instruments.