Vishay introduces new high-speed PIN photodiodes for wearable devices

     Vishay Intertechnology has announced the introduction of two new high-speed silicon PIN photodiodes with improved visible-light sensitivity -VEMD5510C and VEMD5510CF - to meet the need for reliable signal detection in wearables, medical and industrial applications.VishaySemiconductors VEMD5510C with inhibition of infrared radiation and VEMD5510CF filter and improve the signal-to-noise ratio of the black packaging, have fast switch time and small capacitance, the small size of the top surface-mount encapsulation.

     The photodiode has a photosensitive area of 7.5mm2, the photosensitive range of the VEMD5510C is 440nm~700nm, the photosensitive range of the VEMD5510CF is 440nm~620nm, and the reverse photocurrent is 0.6uA and 0.25uA, respectively. The device's on-chip suppression filter eliminates non-visible interference, while the black package blocks excess side light. By using these techniques, the spectral sensitivity of the VEMD5510C for radiation over 800nm and the VEMD5510CF for radiation over 700nm is less than 5%, very close to that of the human eye.

     The photodiode uses a small 5mmx4mm package with a height of 0.9mm to enable thin form factor sensor design. The device is suitable for optical heart rate measurement in wearable devices such as fitness pedometers and smart watches, as well as medical biosensors connected to patient monitoring systems. In addition, these photodiodes enable fast photodetection in smoke detectors for ambient light detection for display brightness adjustment or dimming functions.

     The VEMD5510C and VEMD5510CF have half sensitivity angles of +65°, operating temperatures from -40°C to +100°C, and peak sensitivity wavelengths of 550nm and 540nm, respectively. Photodiodes comply with RoHS and Vishay green standards, are halogen-free, have a moisture sensitivity rating (MSL) of Level 4 of J-STD-020, and can be stored for 72 hours after opening the package.