Silicon PIN photodiode slims down wearable designs

Offering a large radiant-sensitive area measuring 7.5 mm² — and high radiant sensitivity with a reverse light current of 45 µA and dark current of 0.2 nA — the device released today detects visible and near infrared radiation over a wide sensitivity range from 350 nm to 1100 nm.

For green LEDs, the VEMD5080X01's sensitivity represents a 30 % improvement over previous-generation solutions.

When used with Vishay's VLMTG1400 green LED, the photodiode's small size and sensitivity enable slim sensor designs for optical heart rate detection in wearable devices such as fitness trackers and smart watches.

When combined with Vishay's VSMD66694 660 nm and 940 nm dual colour emitting diodes, the device is ideal for SpO2 measurement in medical monitors.

In addition, it provides high speed photo detection in smoke detectors with dual-wavelength light sources and automotive dust and particle sensors in combination with a red diode.

The VEMD5080X01 features a ± 65° angle of half-sensitivity, a wide temperature range of -40 °C to +110 °C, and 950 nm wavelength of peak sensitivity.

The robust device is tested to AEC-Q101 standards for Automotive Grade semiconductors. RoHS-compliant, halogen-free, and Vishay Green, the photodiode provides a moisture sensitivity level (MSL) of 4 in accordance with J-STD-020 for a floor life of 72 hours.

Wettable flanks allow for optical solder joint inspection.

Samples and production quantities of the VEMD5080X01 are available now, with lead times of eight to 10 weeks for large orders.