Silicon photodiodes and phototransistors can detect radiation ranging between 400nm and 1,100nm. Since the maximum sensitivity is approx. 880nm, infrared radiation is particulary well detected by silicon components. Photodiodes and phototransistors are available with black epoxy resin mold, which suppresses the sensitivity within the visible spectral area. For slow optical switching applications, phototransistors are generally used, wherby photodiodes are used for measuring applications or data transmission.

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