203 series
features
Direct replacement for T1 ¼ Bi-pin
Flat topped LED for enhanced, even illumination of large
Water clear lens
Improves equipment reliability
‘Fit & Forget’ reliability
Available in other voltages
Pack quantity = 20 pieces
lens areas
specifications
Typical characteristics (Ta = 25°C)
Part
Number
Colour
Voltage
DC (Vdc)
Vopr
12
12
12
12
12
24 - 28
24 - 28
24 - 28
24 - 28
24 - 28
Current
DC (mA)
Iopr
20
20
20
20
20
11
11
11
11
11
Luminous
Intensity
(mcd) Iv
at 20mA
39
87
576
128
414
39
87
576
128
414
Wave
Length
(nm) λp
660
590
525
470
*
660
590
525
470
*
Operating
Temp.
(°C) Topr
-40 ~ +85^
Storage
Temp.
(°C) Tstg
-40 ~ +85
De-rating
Graphs
A
O
R
R
H
A
O
R
R
H
203-301-21-38 Red
203-325-21-38 Yellow
203-324-21-38 Green
203-934-21-38 Blue
203-998-21-38 Cool White
203-301-23-38 Red
203-325-23-38 Yellow
203-324-23-38 Green
203-934-23-38 Blue
203-998-23-38 Cool White
-30 ~ +85^ -40 ~ +120
-30 ~ +85^ -40 ~ +100
-30 ~ +85^ -40 ~ +100
-30 ~ +85^ -40 ~ +100
-40 ~ +85^
-40 ~ +85
-30 ~ +85^ -40 ~ +120
-30 ~ +85^ -40 ~ +100
-30 ~ +85^ -40 ~ +100
-30 ~ +85^ -40 ~ +100
^ = Products must be de-rated according to the de-rating information. Each de-rating graph refers to specific
LEDs, refer to graphs on pages 2 and 3.
998
x
y
* Typical Emission Colour Cool White
0.287
0.295
0.283
0.305
0.330
0.360
0.330
0.339
Intensities (Iv) and colour shades of white (x,y co-ordinates) may vary between LEDs within a batch
to order
to order please contact us on: t:
+44 (0)1229 582 430
f:
+44 (0)1229 585 155
e:
sales@marl.co.uk
w:
www.leds.co.uk
© marl international limited technical documentation has been designed by marl international limited for
the intention of providing information, which must not be copied or released to a third party without prior
written consent from marl international limited. the information provided does not constitute part of any
order or contract and should not be regarded as a representation relating to either products or service. no
responsibility can be assumed for inaccuracies or printing errors. marl international limited reserve the
right to alter without notice the specification or any conditions of supply for product or service.
BS EN ISO 9001:2008
approved manufacturer
marl international limited ds: 012/ 10 issue 4
page 1 of 4
filament replacement leds
203 series
technical data
Dimensions in mm (typical)
Not to scale
Lamp Base Style
Sub Miniature Bi-Pin T1 ¼
Series
203
Resistor lead signifies positive termination + ve
Colour dot on product denotes LED colour
Metric Equivalent (mm)
4
Max. Power Dissipation (mW)
250
de-rating information
Derating Graph A
55
50
45
40
35
55
50
45
40
35
Derating Graph H
55
50
45
40
35
Derating Graph O
Forward Current IF (mA)
Forward Current IF (mA)
Forward Current IF (mA)
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
6
100.0
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
8
100.0
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
100.0
18
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
to order
to order please contact us on: t:
+44 (0)1229 582 430
f:
+44 (0)1229 585 155
e:
sales@marl.co.uk
w:
www.leds.co.uk
© marl international limited technical documentation has been designed by marl international limited for the intention of
providing information, which must not be copied or released to a third party without prior written consent from marl international
limited. the information provided does not constitute part of any order or contract and should not be regarded as a representation
relating to either products or service. no responsibility can be assumed for inaccuracies or printing errors. marl international
limited reserve the right to alter without notice the specification or any conditions of supply for product or service.
BS EN ISO 9001:2008
approved manufacturer
marl international limited ds: 012/ 10 issue 4
page 2 of 4
203 series
de-rating information continued
Derating Graph R
55
50
45
40
35
Forward Current IF (mA)
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
8.5
100.0
Ambient Temperature Ta (°C)
also available
Part numbers also available in the 203 series:
Part
Number
Colour
Voltage
AC/DC Vopr
48Vdc
5/6Vdc
5/6Vdc
24Vdc
24Vdc
28Vdc
48Vdc
15Vdc
15Vdc
28Vdc
12Vdc
12Vdc
28Vdc
5/6Vdc
5/6Vdc
24Vdc
5/6Vdc
5/6Vdc
28Vdc
203-309-42-38 Yellow
203-312-20-25 Green
203-312-20-38 Green
203-312-21-38 Green
203-312-23-38 Green
203-313-20-38 Green
203-313-22-38 Green
203-314-20-25 Green
203-314-22-38 Green
203-314-40-50 Green
203-317-23-38 Green
203-324-04-38 Green
203-324-20
Green
203-324-20-25 Green
203-324-20-38 Green
203-324-22-38 Green
203-324-23
Green
203-324-23-50 Green
203-324-24-38 Green
203-324-42-38 Green
203-324-42-50 Green
15Vdc
5/6Vdc
5/6Vdc
12Vdc
28Vdc
5/6Vdc
24Vdc
5/6Vdc
24Vdc
3Vdc
28Vdc
*10mA
5/6Vdc
5/6Vdc
5/6Vdc
24Vdc
28Vdc
28Vdc
48Vdc
15Vdc
15Vdc
203-325-20-38 Yellow
203-325-21-51 Yellow
203-325-22-38 Yellow
203-325-24-38 Yellow
203-325-42-38 Yellow
203-325-42-50 Yellow
203-934-04-38 Blue
203-934-20-38 Blue
203-934-22-38 Blue
203-934-23
Blue
203-934-23-50 Blue
203-934-24-38 Blue
5/6Vdc
12Vdc
24Vdc
48Vdc
15Vdc
15Vdc
*10mA
5/6Vdc
24Vdc
28Vdc
28Vdc
48Vdc
203-000-24-50 Orange
203-301-20-25 Red
203-301-20-38 Red
203-301-22
Red
203-301-22-38 Red
203-301-23-50 Red
203-301-24-38 Red
203-301-42-38 Red
203-301-42-50 Red
203-302-23
203-303-21
Red
Red
203-991-04-38 Warm White *10mA
203-991-20-38 Warm White 5/6Vdc
203-991-21-38 Warm White 12Vdc
203-991-22-38 Warm White 24Vdc
203-998-04-38 White
203-998-20
Green
203-998-20-38 White
203-998-22-38 White
203-998-24-38 White
*10mA
5/6Vdc
5/6Vdc
24Vdc
48Vdc
203-303-21-38 Red
203-303-23-38 Red
203-305-20-25 Red
203-305-20-38 Red
203-305-22
Red
203-309-20-25 Yellow
203-309-20-38 Yellow
203-309-23-38 Yellow
The products listed above illustrate all of the options available to order. These products may have custom modifications that
alter their operation beyond the generic information contained within this datasheet. Please contact sales for further
information.
* = These products do not contain integral resistors
to order
to order please contact us on: t:
+44 (0)1229 582 430
f:
+44 (0)1229 585 155
e:
sales@marl.co.uk
w:
www.leds.co.uk
© marl international limited technical documentation has been designed by marl international limited for the intention of
providing information, which must not be copied or released to a third party without prior written consent from marl international
limited. the information provided does not constitute part of any order or contract and should not be regarded as a representation
relating to either products or service. no responsibility can be assumed for inaccuracies or printing errors. marl international
limited reserve the right to alter without notice the specification or any conditions of supply for product or service.
BS EN ISO 9001:2008
approved manufacturer
marl international limited ds: 012/ 10 issue 4
page 3 of 4
203 series
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 portion of the encapsulation (flat-topped) to provide even illumination of switches and
annunciators. Non flat topped versions are also available.
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 can be encountered. Due to subjectivity, evaluation of the LED type is recommended,
(samples of all standard models are available). Care should 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 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 wavelength spectrum have
changed this. Marl has an approved system of ESD control from goods in, through production and into final packing and
despatch. Marl recommend all users of LED based products follow the guidelines of BS 100015.
Power 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, care must be taken to operate the LED at the correct voltage/ current values, depending upon the
ambient temperature. Consequently, a recommendation regarding operating voltages and currents is given in order to address
these temperature effects. This recommendation is termed ‘de-rating’. 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, please refer
to the de-rating graphs for correct operation. Marl accept no liability for any product that is operated higher than the stated
voltage.
to order
to order please contact us on: t:
+44 (0)1229 582 430
f:
+44 (0)1229 585 155
e:
sales@marl.co.uk
w:
www.leds.co.uk
© marl international limited technical documentation has been designed by marl international limited for the intention of
providing information, which must not be copied or released to a third party without prior written consent from marl international
limited. the information provided does not constitute part of any order or contract and should not be regarded as a representation
relating to either products or service. no responsibility can be assumed for inaccuracies or printing errors. marl international
limited reserve the right to alter without notice the specification or any conditions of supply for product or service.
BS EN ISO 9001:2008
approved manufacturer
marl international limited ds: 012/ 10 issue 4
page 4 of 4
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