p ar t number colour lens vol t age current luminous w a ve opera ting st orage dc dc intensity length temp temp v opr lopr lv@20ma l p t opr t stg 01-208-501-21-38 red w ater clear 12 20 1 1000 643 -40 ~ +95^ -40 ~ +100 y es 01-208-521-21-38 y ellow w ater clear 12 20 16000 591 -40 ~ +95^ -40 ~ +100 y es 01-208-521-23-38 y ellow w ater clear 24-28 20 16000 591 -40 ~ +95^ -40 ~ +100 y es 01-208-997-23-38 cool white w ater clear 24-28 20 14000 *see below -40 ~ +95^ -40 ~ +100 y es units vdc ma mcd nm 0 c 0 c l direct replacement for t6.8 slide base l flat-topped for enhanced, even illumination of large lens areas l durable to shock and vibration l ideal for industrial pushbutton switches and annunciator p anels l w arm white leds may be used behind coloured lens as a true replacement for a filament lamp filament replacement leds - t6.8sb ordering information & t ypical t echnical characteristics (t a = 25c) mean t ime between failure = 100,000 hours. luminous intensity figures refer to the unmodified discrete led. fea tures specifica tions high intensity 208 series p ack quantity = 20 pieces ? marl interna tional l td 2008 : ds 027/08 issue 2 page 1 of 3 the information cont ained in this dat asheet does not constitute p art of any order or contract and should not be regarded as a represent ation relating to either product s or service. w e reserve the right to alter without notice the specification or any conditions of supply for product s or service. please note that this product is also available in different volt ages. cont act our sales dep artment for further det ails. ^ = product s must be derated according to the derating information. each derating graph refers to specific leds. appropriate led numbers shown. - refer to p age 3. intensities (lv) and colour shades of white (x,yco-ordinates) may vary between leds within a batch. 997f-c * t ypical emission colour cool white x 0.245 0.361 0.356 0.264 y 0.229 0.385 0.351 0.220 bs en iso 9001:2000 approved manufacturer
208 series dimensions in mm (t ypical) not to scale + printed on base denotes anode. colour dot on product denotes led colour technical informa tion lamp base s tyle series metric equivalent (mm) maximum power dissip ation (mw) t elephone slide base t6.8 208 - 625 design considera tions single-chip leds all devices feature water clear high intensity leds as st andard. the single chip led devices have been modified by the removal of the domed portion of the encap sulation (flat-topped) to provide even illumination of switches and annunciators. non flat topped versions are also available, please cont act the sales dep artment for det ails. product evaluation filament replacement leds have been specifically designed to meet the primary objective of providing improved reliability . as this product range is suit able for both new-build and retro-fit, (sometimes in very old systems), a wide range of illuminated push button switches and lamp holders can be encountered. due to subjectivity , evaluation of the led type is recommended, (samples of all st andard models are available). care should be t aken to correctly simulate operating ambient light conditions to ensure that the correct device has been selected to maximise viewing characteristics such as viewing angle, colour comp atibility and on/of f contrast ratio. electro-st atic discharge (esd) build up of electro-st atic discharge occurs in many situations involving people moving and handling product s. the range of possible situations is very diverse but volt age levels as high as several thousand volt s can and do arise in many individual situations. when an operator charged up to these levels handles a ?st atic sensitive device?, there is a very probable likelihood that the device will be irreversibly damaged. it is essential that precautions are t aken at all st ages during manufacture and assembly of these product s. although leds were never considered to be st atic sensitive devices, changes in manufacturing technology and materials used to produce higher intensity product s over a large range of the wavelength spectrum have changed this. marl has an approved system of esd control from goods in, through production and into final p acking and desp atch. w e recommend all users of led based product s follow the guidelines of bs 100015. power de-rating the forward volt age/current value of an led is dependant upon the ambient temperature of the environment in which it is operated. therefore, care must be t aken to operate the led at the correct volt age/current values, depending upon the ambient temperature. consequently , a recommendation regarding operating volt ages and current s is given in order to address these temperature ef fect s. this recommendation is termed ?de-rating?.it is usual for forward volt ages and current s to be specified for ambient temperature of 25c. however , because the values of these qualities vary with temperature, marl should be cont acted if the device is to be operated at a temperature significantly higher than 25c. marl accept no liability for any product that is operated higher than the st ated volt age. note: all luminous intensity figures refer to the unmodified discrete led. ? marl interna tional l td 2008 : ds 027/08 issue 2 page 2 of 3 the information cont ained in this dat asheet does not constitute p art of any order or contract and should not be regarded as a represent ation relating to either product s or service. w e reserve the right to alter without notice the specification or any conditions of supply for product s or service. bs en iso 9001:2000 approved manufacturer
dera ting informa tion 501 & 521 532 & 997 208 series p ar t no. colour vol t age v opr 01-208-501-22-38 red 24vdc 01-208-521-22-38 y ellow 24vdc 01-208-532-22-38 green 24vdc 01-208-997-22-38 cool white 24vdc 01-208-997-24-38 cool white 48vdc units part numbers also available in the 208 series: ? marl interna tional l td 2008 : ds 027/08 issue 2 page 3 of 3 the information cont ained in this dat asheet does not constitute p art of any order or contract and should not be regarded as a represent ation relating to either product s or service. w e reserve the right to alter without notice the specification or any conditions of supply for product s or service. bs en iso 9001:2000 approved manufacturer the product s listed above illustrate all of the options available to order . these product s may have custom modifications that alter their operation beyond thegeneric information cont ained within this dat asheet.
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