Vishay TEPT5700 Ambient Light Sensor Phototransistor

The Vishay TEPT5700 is a leaded silicon NPN epitaxial planar phototransistor designed for ambient light sensing. Housed in a compact T-1 3/4 (5mm) package, this sensor is highly sensitive to the visible light spectrum, closely matching the response of the human eye, with peak sensitivity occurring at 570nm. This makes it exceptionally effective for applications requiring accurate ambient light measurement for automated control systems.

A primary application is the intelligent dimming of display backlights in LCDs and the automatic control of keypad backlighting in mobile devices, helping to conserve battery life and improve user comfort. It is also widely used in industrial settings for the automated on/off operation of lighting based on ambient light levels, promoting energy efficiency.

Key Features & Specifications

• High Photo Sensitivity: Delivers a strong, reliable signal from ambient light sources.
• Wide Viewing Angle: Features an angle of half sensitivity of ±50°, allowing for effective light detection from a broad area.
• Human Eye Response: Peak sensitivity at 570nm aligns with the visible spectrum for intuitive lighting control.
• Robust Performance: Offers a power dissipation of 100mW and operates reliably across a wide temperature range from -40°C to 85°C.
• Compact Design: The standard T-1 3/4 through-hole package with 2 pins facilitates easy integration into various electronic circuits and PCBs.

With its proven reliability from Vishay, this phototransistor is an ideal, cost-effective solution for adding ambient light sensing capabilities to consumer electronics, industrial automation, and smart lighting projects.