New Yorker Electronics has added the new Vishay Semiconductors VEMD8081 high-speed and high-sensitivity PIN photodiode with enhanced sensitivity for visible light. The Vishay PIN photodiode provides increased photocurrent of 33 µA in a 4.8 mm by 2.5 mm surface mount device package with a 5.4 mm2 sensitive area detecting visible and near infrared radiation.
Designed at a slim 0.48 mm height, the device is idea for optical heart rate detection in wearable devices such as fitness trackers and smartwatches when placed between two pulsing green LEDs. They are also used in oxygen saturation (SpO2) measurement in medical monitors when combined with red and infrared emitters.
The new Vishay VEMD8081 offers 15% greater reverse light current than its predecessor, the Vishay VEMD8080, while maintaining the same package dimensions. It utilizes Vishay’s proven wafer technology to detect visible and near infrared radiation. New Yorker Electronics is distributing the new device to offer designers a drop-in replacement that can improve performance by increasing signal output, or extend battery life by reducing LED current.
The VEMD8081’s rectangular shape maximizes the area of the photodiode receiving reflected light, eliminating the wasted area typically found in square photodiodes. For heart rate measurement in wearable devices, the light reflected off the skin is received by the photodiode and converted to an output current, with the device’s increased sensitivity enabling more accurate measurements.
Samples and production quantities of the VEMD8081 are available now, with lead times of 10 weeks.