High-reliability visible colour LEDs
02 November 2010
Hermetically sealed TO-46 package contains built-in ESD protection for LEDs.
Providing military systems engineers with the ability to achieve high brightness colour illumination and indication with well-defined patterns, TT electronics OPTEK Technology has developed a series of high-reliability, high-sensitivity colour LEDs processed to MIL-PRF-19500-level TX and TXV specifications.
Designated the OVM4x series, the visible LEDs feature hermetically sealed TO-46 package with built-in ESD protection, and are available in blue, green, red and yellow. Unlike commercial LEDs, these devices are designed to function in extreme conditions that are typically found in defence electronics, military vehicle lighting and harsh industrial applications.
“As more lighting applications in military electronics are being implemented with solid state light sources, we recognised the need for a high-reliability, ruggedised version of our colour LEDs that incorporated built-in ESD protection,” said Rodney Bailey, Vice President of optoelectronic component solutions for TT electronics OPTEK Technology.
According to Bailey, the OVM4xTX and OVM4xTXV LEDs are processed to OPTEK’s 100% screening and QC programme patterned after MIL-PRF-19500 standards, with Group A and B testing performed on each lot. Group C testing is performed every six months to ensure reliability.
Colour intensity and dominant wavelength specifications for the OVM4x Series LEDs are:
• OVM4BTX/TXV blue LEDs are made of indium gallium nitride (InGaN) with typical luminous intensity of 2260mcd and dominant wavelength from 460 – 470nm at IF=20mA. Forward voltage is rated from 2.60V (typical) to 2.95V (max.)
• OVM4GTX/TXV green LEDs are made of indium gallium nitride (InGaN) with typical luminous intensity of 6520mcd and dominant wavelength from 520 – 540nm at IF=20mA. Forward voltage is rated from 2.60 (typical) to 2.95V (max.)
• OVM4RTX/TXV red LEDs are made of aluminium indium gallium phosphide (AlInGaP) with typical luminous intensity of 3330mcd and dominant wavelength from 619 – 629nm at IF=20mA. Forward voltage is rated from 1.8 (typical) to 2.15V (max.)
• OVM4YTX/TXV yellow LEDs are made of aluminium indium gallium phosphide (AlInGaP) with typical luminous intensity of 2010mcd and dominant wavelength from 584 – 594nm at IF=20mA. Forward voltage is rated from 1.8 (typical) to 2.15V (max.)
All LEDs in the OVM4x series exhibit continuous forward current of 100 mA, with a peak forward current rating of 1.6A (at 10% duty cycle, 1KHz). Power dissipation is 370 mW; with a current linearity vs. ambient temperature rating of -0.2mA/°C. Operating temperature range is from -55°C to +100°C.
Packaged with a clear glass lens, the LEDs feature a viewing angle of 18°.
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