The HSDL-5420#1S1 is a photodiode optical sensor belonging to the HSDL-5400 series. It is manufactured by Lite-On Inc. and falls under the category of Sensors, Transducers - Optical Sensors - Photodiodes. The HSDL-5420#1S1 has a response time of 7.5ns and operates at a maximum reverse voltage (Vr) of 40V. It has a spectral range of 770nm to 1000nm and a responsivity of 0.5 A/W at a wavelength of 875nm. The HSDL-5420#1S1 has a diode type of PIN and an active area of 0.15mm2. It is suitable for through-hole mounting and comes in an axial package. The HSDL-5420#1S1 has an operating temperature range of -40°C to 85°C. It is an obsolete product and may not be readily available in the market.