BP103 PhotoTransistor

The BP103 PhotoTransistor is a compact optoelectronic device engineered for precise light detection and reliable signal conversion. It converts incident light into electrical current with high sensitivity and a spectral response peak near 900 nm, making it particularly effective for infrared sensing tasks. High sensitivity with spectral peak near 900 nm for enhanced IR detection. Collector-emitter voltage rating up to 30V for stable operation under moderate voltages. Collector current up to 50mA to deliver strong output signals across diverse conditions. Fast response time under 20 microseconds to support rapid detection and processing. Durable TO-18 metal can package for effective heat dissipation and mechanical robustness. Compared with many standard phototransistors, the BP103 stands out in both sensitivity and response speed, making it well suited for modern sensing and detection systems. The device’s robust electrical ratings combined with its compact form factor simplify integration into electronic circuits used in automation and measurement equipment. Applications and Integration The BP103 is suitable for a range of optoelectronic applications that require accurate infrared detection and quick response, including optical switches, counting devices, proximity sensors, and general-purpose light-sensing circuits. Its low-noise light-to-current conversion improves measurement consistency across varying ambient light levels, while the TO-18 metal can package provides mechanical reliability for prototype and production environments. For circuit integration, designers typically pair the BP103 with suitable biasing resistors and signal conditioning stages to set operating point and output amplitude to match downstream electronics. Proper PCB layout and decoupling help preserve the device’s fast response and minimize interference in sensitive measurement applications.