27.11.2012 led39 -pr 1 of 3 led20 - pr technical data mid- infrared light emitting diode light emitting diodes with central wavelength 2. 05 m series are based on heterostructures grown on gasb substrates by mocvd. ga inassb is used in the active layer. wide band gap solid solutio ns algaa ssb are used for good electron confinement. led 20- pr has a stable ouput power and a lifetime more then 80000 hours. specifications (unit: mm) ? structure: g ain assb/ al ga assb ? peak wavelength: typ. 2. 05 m ? optical output power: typ. 1.0 m w qcw ? p ackage: to - 18 with pr and without window absolute maximum ratings (t a =25c) item condition value unit min. typ. max. peak wavelength t=300 k 2.00 2.05 2.09 m fwhm 150 ma q cw 0. 15 0. 20 0. 25 m quasi - cw optical power 200 ma qcw 0.8 1.0 1.2 mw pulsed optical power i= 1 a , f=1 hz , d . c . 0.1% 20 25 30 mw switching time t=300 k 10 20 30 ns operation voltage 200 ma qcw 0. 5 - 1.5 v operating temperature - 200 ? +50 c emitting area 300 x 300 m soldering temperature 180 c pa ckage to - 18, with parabol reflector and without window operation instructions ? led basic circuit connection ? we recommend to use one of our drivers and evaluation boards designed for those mid - ir leds d- 11, d - 31, d - 31m dlt - 27, dlt - 37 md - 1c, md - 1p
27.11.2012 led39 -pr 2 of 3 we recommend to use quasi continuous wave (qcw) mode with duty cycle 50% or 25% to obtain maximum average optical power and short pulse mode to obtain maximum peak power. hard cw ( continues wave) mode is not recommended. ? quasi cw mode ? pulsed mode typical performance curves spectra ? operation currents (qcw, t=300 k) spectra ? temperature (qcw, i=150 ma) output power ? forward current (qcw, t=300 k) forward current ? forward voltage (qcw, t=300 k)
27.11.2012 led39 -pr 3 of 3 beam divergence (far - field patte rn) note: the above specifications are for reference purpose only and subjected to change without prior notice. precaution for use 1. cautions ? check your connection circuits before turning on the led. ? observe the led polarity: led anode is marked with a red dot. ? do not connect the led to the multimeter! 2. soldering conditions ? do not apply any stress to the lead particularly when heat. ? after soldering the leds should be protected from mechanical shock or vibration until the leds return to room temperatur e. ? when it is necessary to clamp the leds to prevent soldering failure, it is important to minimize the mechanical stress on the leds. 3. static electricity ? the leds are very sensitive to static electricity and surge voltage. so it is recommended that a wrist band and/or an anti - electrostatic glove be used when handling the leds. ? all devices, equipment and machinery must be grounded properly. it is recommended that precautions should be taken against surge voltage to the equipment that mounts the leds. 4. hea t generation ? thermal design of the end product is of paramount importance. please consider the heat generation of the led when making the system design. the coefficient of temperature increase per input electric power is affected by the thermal resistance of the circuit board and density of led placement on the board, as well as other components. it is necessary to avoid intense heat generation and operate within the maximum ratings given in the specification. ? the operating current should be decided after considering the ambient maximum temperature of leds.
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