PIN Photodiode For Reliable Signal Detection In Wearables

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pin photodiode
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To meet the need for reliable signal detection in wearable devices and medical applications, Vishay Intertechnology has launched a new high-speed silicon PIN photodiode that delivers enhanced sensitivity for visible light.

Featuring a rectangular 4.8 mm by 2.5 mm top-view, surface-mount package with an industry-low 0.48 mm profile, the VEMD8080 claims fast switching times and low capacitance of 47 pF for precise signal detection in wearable devices and medical applications.

Market Applications:

  • Optical heart rate detection in wearable devices when used with green LEDs, such as Vishay’s VLMTG1400
  • SpO2 measurement in medical monitors when combined with 660 nm and 940 nm dual color emitting diodes

Key features of the new PIN Photodiode:

• 0.37 mm lower profile than competing solutions
• Detects visible and near infrared radiation
• For green LEDs, sensitivity claims a 30 % improvement over the standard technology in previous generation solutions
• Small size and high sensitivity enable slim sensor designs for optical heart rate detection in wearable devices such as fitness trackers and smartwatches
• Rectangular shape allows several light emitting diodes to be placed close to the radiant sensitive area to maximize the signal

Other Specifications:

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• Typical capacitance: 47 pF
• Radiant sensitive area: 4.5 mm²
• Reverse light current: 28 µA
• Dark current: 0.2 nA
• Spectral bandwidth: 350 nm to 1100 nm
• Angle of half-sensitivity: ± 65°
• Temperature range: -40 °C to +85 °C
• Wavelength of peak sensitivity: 950 nm

Samples of the VEMD8080 are available now. Production quantities will be available in March 2018, with lead times of eight to 10 weeks for large orders.

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A product demo board is available from MikroElektronika and Vishay distributors.

Click here for more information.

 

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