The SFH401 is a silicon NPN phototransistor designed for a wide range of applications in the visible and near-infrared spectrum. Manufactured by OSRAM Opto Semiconductors Inc., this device is known for its high sensitivity and reliability. It comes in a standard T-1 3/4 (5mm) package, making it easy to integrate into various electronic circuits and systems.

Applications:

• Photointerrupters: Used to detect the presence or absence of an object by interrupting a light beam.
• Light Barriers: Employed in security systems or industrial automation to detect movement or intrusion.
• Position Sensors: Utilized in applications requiring precise position detection, such as encoders.
• Industrial Automation: Integral to automated processes for object detection and control.
• Ambient Light Detection: Can be used in circuits to measure the intensity of ambient light.

Features:

• High Sensitivity: Offers excellent response to visible and near-infrared light.
• T-1 3/4 (5mm) Package: Standard package size for easy integration.
• NPN Silicon Phototransistor: Reliable and well-established phototransistor technology.
• Wide Spectral Range: Operates effectively across a broad spectrum.
• Fast Switching Speeds: Suitable for applications requiring rapid response times.

Benefits:

• Easy Integration: The standard package simplifies mounting and connection in diverse applications.
• Reliable Performance: OSRAM's reputation ensures consistent and dependable operation.
• Cost-Effective: Offers a balance of performance and affordability.
• Versatile Use: Adaptable to numerous applications requiring light detection.
• Improved System Performance: Enhances the responsiveness and accuracy of light-sensitive circuits.

The SFH401 phototransistor features a collector-emitter voltage (VCEO) typically around 30V and a collector current (IC) that can reach up to 50mA. Its spectral sensitivity is optimized for wavelengths in the 800-900 nm range, making it highly suitable for use with infrared LEDs. The device's compact size and robust construction make it suitable for both indoor and outdoor applications. The epoxy lens helps focus incoming light onto the active area of the phototransistor, enhancing its sensitivity. The SFH401 is commonly used in reflective sensors, where it detects light reflected off a nearby object. This is useful in robotics for line following, or in vending machines to detect if a product has been dispensed.