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Dual-Color Red and IR Emitting Diode Provides Balanced Signal Levels for Wearables and Medical Monitoring Systems

Dual-Color Red and IR Emitting Diode

Vishay Intertechnology unveils compact new dual-color red and IR emitting diode for wearable devices and medical patient monitoring systems.

Touted to be offered in a compact 2 mm by 2 mm by 0.87 mm package, the Vishay Semiconductors VSMD66694 features wavelengths of 660 nm (red) and 940 nm (IR) and is built on SurfLight technology for best-in-class radiant power of 9.5 mW and 8.5 mW, respectively.

For space-constrained devices such as smart watches and fitness bands, the VSMD66694 is said to replace two leaded diodes with one component in a surface-mount package that can be easily combined with any custom-designed lens system.

Key Nuggets

  • The latest emitter provides fast switching times of 10 ns and forward voltage down to 1.4 V.
  • Suitable for high pulse current operation to 1 A at 100 µs, the device features a ± 60° angle of half-intensity and operates over a temperature range of -25 °C to +85 °C.
  • The VSMD66694 provides a moisture sensitivity level (MSL) of 3 in accordance with J-STD-020 for a floor life of 168 hours, supports lead (Pb)-free reflow soldering, and is RoHS-compliant, halogen-free, and Vishay Green.
  • The device features a narrow spectral bandwidth of 20 nm at 660 nm, and its balanced radiant power at red and IR wavelengths provides balanced signal levels for SpO2 and pulse rate monitoring.

Device Specification Table:

ColorRedIR
Peak wavelength (nm)660940
Radiant power (mW)9.58.5
Radiant intensity (mW/sr)2.31.5
Spectral bandwidth (nm)2040
Power dissipation (mW)161119
Typ. forward voltage (V)2.01.4

Samples and production quantities of the new dual-color red and IR emitting diode are available now, with lead times of 10 to 12 weeks for large orders.

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