Vishay Launches Dual-Color Red and IR Emitter

Vishay Intertechnology, Inc. based in Malvern, Pennsylvania USA, introduced a new dual-color red and IR emitting diode. The company designed the red and IR emitting diode to save space in medical patient monitoring systems and wearable devices. The dual-color red and IR emitting diode, VSMD66694, comes in a compact 2 mm by 2 mm by 0.87 mm package that features wavelengths of 660 nm (red) and 940 nm (IR). The device employs the company’s SurfLight™ technology for radiant power of 9.5 mW and 8.5 mW, respectively.

According to Vishay, theVSMD66694 can replace two leaded diodes with one component in a surface-mount package for space-constrained devices such as fitness bands and smart watches. Vishay says that the surface-mount package can be easily combined with any custom-designed lens system. At 660 nm wavelength, the device features a narrow spectral bandwidth of 20 nm.
Vishay contends that its balanced radiant power at red and IR wavelengths offer balanced signal levels for pulse rate and SpO2 monitoring.

The emitter provides switching times of just 10 ns and forward voltage down to 1.4 V. It is suitable for high pulse current operation to 1 A at 100 µs and features a ± 60° angle of half intensity. The VSMD66694 operates over a temperature range of -25 °C to +85 °C and provides a moisture sensitivity level (MSL) of 3 in accordance with J-STD-020 for a floor life of 168 hours.
The emitter supports lead (Pb)-free reflow soldering and is RoHS-compliant, halogen-free, and Vishay Green.

Device Specification Table:

Color

Red

IR

Peak wavelength (nm)

660

940

Radiant power (mW)

9.5

8.5

Radiant intensity (mW/sr)

2.3

1.5

Spectral bandwidth (nm)

20

40

Power dissipation (mW)

161

119

Typ. forward voltage (V)

2.0

1.4

Vishay has made available samples and production quantities of the new dual-color red and IR emitting diode, with lead times of 10 to 12 weeks for large orders.

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