FILAMENT REPLACEMENT LEDs - T3¼
FEATURES
Direct replacement for T3¼ MES E10
261
SERIES
Ideal for industrial pushbutton switches and
annunciator panels
PACK QUANTITY = 20 PIECES
Fully encapsulated for unrivalled vibration and shock
resistance
Bi-polar and Bridge Rectified
Warm White LEDs may be used behind coloured lens as a true
replacement for a filament lamp.
Product illustrated 261-990-95
SPECIFICATIONS
Ordering Information & Typical T
echnical Characteristics (T
a = 25°C)
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
λp
OPERATING
T
opr
STORAGE
T
stg
LENS
DC
DC
INTENSITY
LENGTH
TEMP
TEMP
HIGH INTENSITY
261-990-95-38
261-993-95-38
261-990-95
261-993-95
UNITS
993
x
**Typical
emission colour warm white
0.426
0.439
0.497
0.477
Cold White
Warm White
Cold White
Warm White
Water Clear
Water Clear
Water Clear
Water Clear
60
60
60
60
Vac/dc
990
10
10
10
10
mA
18000
9200
18000
9200
mcd
*
**
*
**
nm
-30 ~ +85^
-30 ~ +85^
-30 ~ +85^
-30 ~ +85^
0
-40 ~ +100
-40 ~ +100
-40 ~ +100
-40 ~ +100
0
Yes
Yes
Yes
Yes
C
C
x
y
0.296
0.276
*Typical
emission colour cold white
0.287
0.330
0.330
-38 denotes flat-topped led
y
0.400
0.431
0.446
0.413
0.295
0.339
0.318
Intensities (lv) and colour shades of white (x,y co-ordinates) may vary between LEDs within a batch.
993 & 990
^ = 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 •
•
T
elephone +44 (0)1229 582430
•
Fax: +44 (0)1229 585155
relating to either products or service.
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 reserve the right to alter without notice the specification or any conditions of supply
© MARL INTERNATIONAL LTD 2007 : DS 012/07
Issue 1
SAMPLES AVAILABLE
Page 1 of
2
261 Series
Dimensions in mm (Typical)
Not to scale
Colour dot on product denotes LED colour
TECHNICAL INFORMATION
Lamp Base Style
Minature Edison Screw T3¼ E10
Series
261
Metric Equivalent (mm)
10
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 25°C. 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 25°C.
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.
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 reserve the right to alter without notice the specification or any conditions of supply
Approved Manufacturer
BS EN ISO 9001:2000
© MARL INTERNATIONAL LTD 2007 : DS 012/07
Issue 1
SAMPLES AVAILABLE
Page 2 of
2
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