The Honeywell SD2440-004 is an NPN silicon phototransistor housed in a hermetically sealed glass lensed metal can package, suitable for direct mounting on double-sided printed circuit boards. This phototransistor offers a miniature design, hermetic sealing, and a wide operating temperature range (-55°C to +125°C), making it ideal for various applications requiring light detection and signal conversion. It is mechanically and spectrally matched to Honeywell's SE2460 and SE2470 infrared emitting diodes, enabling efficient and reliable light-to-current conversion in infrared systems. The device's hermetic construction ensures stability and longevity in harsh environments.