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FILAMENT REPLACEMENT LEDs - T6.8SB Bi-Polar
FEATURES
238 SERIES
PACK QUANTITY = 20 PIECES
Direct replacement for T6.8 Slide Base Bi-Polar: ac/dc operation Flat-topped version available for increased viewing angle
Massive reductions in maintenence costs Warm White LEDs may be used behind coloured lens as a true replacement for a filament lamp.
SPECIFICATIONS
Ordering Information & Typical T echnical Characteristics (T a = 25C)
Mean Time Between Failure = 100,000 Hours. PART NUMBER COLOUR Luminous intensity figures refer to the unmodified discrete LED. VOLTAGE Vopr CURRENT lopr LUMINOUS lv@20mA WAVE p OPERATING T opr STORAGE T stg
LENS
AC/DC
DC
INTENSITY
LENGTH
TEMP
TEMP
HIGH INTENSITY
238-993-93-38 238-993-98-38 UNITS 993 *Typical emission colour warm white 0.439 0.497 0.477 Warm White Warm White Water Clear Water Clear 28 24 Vac/dc 15 18 mA 9200 9200 mcd * * nm -30 ~ +85^ -30 ~ +85^
0
-40 ~ +100 -40 ~ +100
0
Yes Yes
C
C
x y
0.426 0.400
0.431
0.446
0.413
Intensities (lv) and colour shades of white (x,y co-ordinates) may vary between LEDs within a batch. 993
^ = Products must be derated according to the derating information. Each derating graph refers to specific LEDs.
How to Order:
website: www.marl.co.uk * email: sales@marl.co.uk *
The information contained in this datasheet does not constitute part of any order or contract and should not be regarded as a representation
*
T elephone +44 (0)1229 582430
*
Fax: +44 (0)1229 585155
relating to either products or service. for products or service.
Marl International Limited reserve the right to alter without notice the specification or any conditions of supply
(c) MARL INTERNATIONAL LTD 2007 : DS 009/07
Issue 1
SAMPLES AVAILABLE
Page 1 of
2
238 Series
Dimensions in mm (Typical)
product denotes LED colour
+ printed on base denotes Anode. Colour dot on
TECHNICAL INFORMATION
Lamp Base Style T elephone Slide Base T6.8 Series 238 Metric Equivalent (mm) Maximum Power Dissipation (mW) 625
DESIGN CONSIDERATIONS
Single-Chip LEDs All devices feature water clear high intensity LEDs as standard. The single chip LED devices have been modified by the removal of the domed please contact the sales department for details. Product Evaluation Filament Replacement LEDs have been specifically designed to meet the primary objective of providing improved reliability. As this product range is suitable for both new-build and retro-fit, (sometimes in very old systems), a wide range of illuminated push button switches and lamp holders be taken 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 compatibility and on/off contrast ratio. Electro-static Discharge (ESD) Build up of electro-static discharge occurs in many situations involving people moving and handling products. The range of possible situations is can be encountered. Due to subjectivity, evaluation of the LED type is recommended, (samples of all standard models are available). Care should
portion of the encapsulation (flat-topped) to provide even illumination of switches and annunciators. Non flat topped versions are also available,
very diverse but voltage levels as high as several thousand volts can and do arise in many individual situations. When an operator charged up to these levels handles a `static sensitive device', there is a very probable likelihood that the device will be irreversibly damaged. It is essential that precautions are taken at all stages during manufacture and assembly of these products. Although LEDs were never considered to be static
sensitive devices, changes in manufacturing technology and materials used to produce higher intensity products over a large range of the and despatch. We recommend all users of LED based products follow the guidelines of BS 100015. Power de-rating
wavelength spectrum have changed this. Marl has an approved system of ESD control from goods in, through production and into final packing
care must be taken to operate the LED at the correct voltage/current values, depending upon the ambient temperature. Consequently, a termed `de-rating'.
The forward voltage/current value of an LED is dependant upon the ambient temperature of the environment in which it is operated. Therefore, recommendation regarding operating voltages and currents is given in order to address these temperature effects. This recommendation is
It is usual for forward voltages and currents to be specified for ambient temperature of 25C. However, because the values of these qualities vary with temperature, Marl should be contacted 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 stated voltage.
Note:
All luminous intensity figures refer to the unmodified discrete LED.
website: www.marl.co.uk * email: sales@marl.co.uk * *
T elephone +44 (0)1229 582430
*
Fax: +44 (0)1229 585155
relating to either products or service. supply for products or service.
The information contained in this datasheet does not constitute part of any order or contract and should not be regarded as a representation Marl International Limited reserve the right to alter without notice the specification or any conditions of
Approved Manufacturer
BS EN ISO 9001:2000
(c) MARL INTERNATIONAL LTD 2007 : DS 009/07
Issue 1
SAMPLES AVAILABLE
Page 2 of
2

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