25.04.2013 uvb -280 1 / 4 uvb - 28 0 deep uv - led, algan uva - 28 0 is an algan based, narrow bandwidth , 28 0nm led available in different configurations . deep uv - leds are widely used for water sterilization , air purification, germicidal and medical applications, diagnostics, and l aboratory testing. specifications packaging options ? structure: algan ? peak wavelength: 28 0 nm ? optical output powe r: typ. 1.4 mw ? life time: 5 0 hours ? bare chip die ? to - 39 open can ? to - 39 flat window ? to - 5 flat window ? to - 5 hemispherical lens absolute maximum ratings (t a =25c) parameter symbol value unit power dissipation, dc p d 220 mw forward current, dc i f 40 ma reverse voltage (i r =10a) v r >2 v reverse current (v r =5v) i r <200 a operating temperat ure t opr - 20 ? +50 c storage temperature t stg - 20 ? +85 c soldering temperature (max. 5s) t sol 190 c general characteristics (t a =25c) parameter symbol condition min. typ. max. unit peak wavelength p i f = 20 ma 280 284 290 nm optical power p o i f = 20 ma 1. 3 mw beam angle i f = 20 ma 1 60 degree forward voltage u f i f = 20 ma - 8 v half width (fwhm) ? i f = 20 ma - 9 - nm life time i f = 20 ma - 50 - h wavelength measurements tolerance i s +/ - 2% output power measurement tolerance is +/ - 10% voltage measurement tolerance is +/ - 2%
25.04.2013 uvb -280 2 / 4 typical performance characteristics radiant power vs. forward current: forward current vs. forward voltage: relative intensity vs . peak wavelength : wavelength shift vs . forward current:
25.04.2013 uvb -280 3 / 4 far field pattern (i op =25 ma) chip die l ayout (all dimensions in m) solder (au - sn) or resin (ag) is recommended for bonding of the submount
25.04.2013 uvb -280 4 / 4 precautions operation in order to ensure the correct functioning of these leds, compliance to the maximum electrical specifications is paramount. these leds are particularly sensitive to any current value that exceeds the absolute maximum rating of the product. any applied current in excess of the maximum specification will cause damage and possible complete and may result in complete failure of the product. the current flowing in a led is an exponential function of the voltage across it. a small change in voltage can produce a very large ch ange in current and lead to complete failure of the led. the use of a current regulated drive circuit is recommended for these products. any attempt to drive these leds with a voltage source instead of a current source will cause damage and possible total failure of the product uv - radiation these devices are ultraviolet leds. during operation, the led emit high intensity ultraviolet (uv) light, which is harmful to skin and eyes. uv light is hazardous to skin and may cause cancer. avoid exposure to uv lig ht when the led is operational. precautions must be taken to avoid looking directly at the uv light without the use of uv protective glasses. do not look directly at the front of the led or at the leds lens when the led is operational. it is advised, to at tach a warning label on products/systems that utilize uv leds: static electricity uvtop leds are esd (electrostatic discharge) sensitive. static electricity and surge voltages seriously damage uv leds an may result in complete failure of the device. precautions must be taken against esd when handling or operating these devices.
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