Hamamatsu manufactures APD modules, which consist of an APD, low-noise amplifier, and bias power supply integrated in a compact package. Several types are available. Standard modules (part #: C5331 series) contain a near-infrared or a short-wavelength type APD. High-sensitivity modules (part #: C5460 series) have high gain for detection of low light. High-speed modules (part #: C5658 series) operate over a wide range of frequencies and have fast response for pulsed light detection. TE-cooled modules (part #: C4777 series) have high sensitivity for low-light-level detection and also offer greatly improved stability. Custom APD modules are also available.

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