205 RS series
features
• Direct replacement for T1 ¾ Midget Groove S5.7s
• Reverse polarity options available
• Water clear lens
• Centre contact Anode as standard
• Low current versions available
• Warm white LEDs may be used behind coloured lens as a true
replacement for a filament lamp
• Pack Quantity = 20 Pieces
specifications
Ordering information and typical characteristics (Ta = 25°C)
RS Part
Number
2387589
2387630
2387680
2387602
2387652
2387703
2387595
2387646
2387696
2387618
2387674
469923
469812
469816
2829960
2829976
2829982
Marl Part
Number
205-501-21-38
205-501-22-38
205-501-23-38
205-521-21-38
205-521-22-38
205-521-23-38
205-532-21-38
205-532-22-38
205-532-23-38
205-930-21-38
205-930-22-38
205-993-21-38
205-993-22-38
205-993-23-38
205-997-21-38
205-997-22-38
205-997-23-38
Colour
Red
Red
Red
Yellow
Yellow
Yellow
Green
Green
Green
Blue
Blue
Warm White
Warm White
Warm White
White
White
White
Voltage
Vac/dc
12 Vdc
24 Vdc
24-28 Vdc
12 Vdc
24 Vdc
24-28 Vdc
12 Vdc
24 Vdc
24-28 Vdc
12 Vdc
24 Vdc
12 Vdc
24 Vdc
24-28 Vdc
12 Vdc
24 Vdc
24-28 Vdc
Current
DC
(mA)
10
10
8
10
10
8
10
10
8
10
10
10
10
8
10
10
8
Luminous
Intensity
(mcd)
600
600
600
600
600
600
2300
2300
2300
9870
9870
850
850
850
27000
27000
27000
Wave
Length
(nm)
630
630
630
585
585
585
515
515
515
465
465
* See pg.2
* See pg.2
* See pg.2
* See pg.2
* See pg.2
* See pg.2
Operating
Temp.
(°C)
-40 - +80
-40 - +80
-40 - +80
-40 - +80
-40 - +80
-40 - +80
-40 - +75
-40 - +75
-40 - +75
-30 - +85
-30 - +85
-30 - +85
-30 - +85
-30 - +85
-30 - +85
-30 - +85
-30 - +85
Storage
Temp.
(°C)
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
-40 - +100
De-rating
Graphs
D
D
D
D
D
D
F
F
F
U
U
I
I
I
I
I
I
^ = Voltage for 20mA product is Vf at 20mA, not Vopr
- Products must be de-rated according to the de-rating information. Each de-rating graph refers to
specific LEDs. Please refer to graphs on page 2.
- Luminous intensity is measured at 20mA on a discrete LED unless otherwise stated.
© 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 - dsn 205 RS - version 2014-02-27-173203
page 1 of 5
205 RS series
technical data
11.5
3.5
Green dot on base of product signifies reverse
polarity. Colour dot on LED denotes LED colour.
Dimensions in mm (typical)
Not to scale
Lamp Base Style
Series
Metric Equivalent
(mm)
Max. Power Dissipation
(mW)
T1 ¾ Midget Groove S5.7s
899F
x
y
205
5
997F-C
x
y
0.31
0.32
5.7
5
500
*Typical emission colour White
-
-
-
-
-
-
*Typical emission colour Warm White
0.4255
0.4000
0.4390
0.4310
0.4680
0.4385
0.4519
0.4086
Intensities (Iv) and colour shades of white (x,y co-ordinates) may vary between leds within a batch
de-rating information
Derating Graph D
55
50
45
40
35
55
50
Derating Graph F
55
50
45
40
35
Derating Graph I
Forward Current IF (mA)
Forward Current IF (mA)
40
35
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
100.0
Forward Current IF (mA)
45
30
25
20
15
10
5
0
0.0
20.0
40.0
60.0
80.0
100.0
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)
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
© 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 - dsn 205 RS - version 2014-02-27-173203
page 2 of 5
205 RS series
de-rating information continued
Derating Graph U
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
100.0
8.5
Ambient Temperature Ta (°C)
© 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 - dsn 205 RS - version 2014-02-27-173203
page 3 of 5
205 RS series
also available
Part numbers also available in the 205 series:
Part
Colour
Number
205-501-04-38
205-501-20-38
205-501-24-38
205-501-30-38
205-501-31-38
205-501-32-38
205-501-34-38
205-502-04
205-512-04
205-514-21
205-521-04-38
205-521-20-38
205-521-24-38
205-521-32-38
205-521-33-38
205-521-34-38
205-532-04-38
205-532-20-38
205-532-22-51
205-532-24-38
205-532-31-38
205-532-32-38
205-532-33-29
205-532-33-38
205-532-34-38
205-899-33-38
205-899-33-50
205-930-20-38
205-930-23-38
205-930-24-38
205-993-00-50
205-993-04-38
205-993-20-38
205-993-24-38
205-993-32-38
205-993-33-38
205-993-42-38
205-993-46-38
205-993-53-52
205-993-53-53
205-993-53-54
205-993-53-55
205-993-73-38
205-997-04-38
205-997-13-38
205-997-20-38
205-997-24-38
205-997-32-38
205-997-34-38
205-997-42-38
Red
Red
Red
Red
Red
Red
Red
Red
Green
Green
Yellow
Yellow
Yellow
Yellow
Yellow
Yellow
Green
Green
Green
Green
Green
Green
Green
Green
Green
Warm White
Warm White
Blue
Blue
Blue
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
Warm White
White
White
White
White
White
White
White
Vopr
20 mA dc
5/6 Vdc
48 Vdc
5/6 Vdc RP
12 Vdc RP
24 Vdc RP
48 Vdc RP
20 mA dc
20 mA dc
12 Vdc
20 mA dc
5/6 Vdc
48 Vdc
24 Vdc RP
28 Vdc RP
48 Vdc RP
20 mA dc
5/6 Vdc
24 Vdc
48 Vdc
12 Vdc RP
24 Vdc RP
28 Vdc RP
28 Vdc RP
48 Vdc RP
28 Vdc RP
28 Vdc RP
5/6 Vdc
28 Vdc
48 Vdc
15 Vdc RP
20 mA dc
5/6 Vdc
48 Vdc
24 Vdc RP
28 Vdc RP
15 Vdc
35 Vdc
50 Vdc
50 Vdc
50 Vdc
50 Vdc
28 Vac 50 Hz
20 mA dc
20 mA dc RP
5/6 Vdc
48 Vdc
24 Vdc RP
48 Vdc RP
15 Vdc
Voltage
RP = Reverse Polarity
© 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 - dsn 205 RS - version 2014-02-27-173203
page 4 of 5
205 RS series
design considerations
Single-Chip LEDs
All devices feature water clear high intensity LEDs as standard. In devices where discrete LEDs are used, 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.
Flat-topping does not apply to devices using surface-mounted device (SMD) LEDs.
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, 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.
© 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 - dsn 205 RS - version 2014-02-27-173203
page 5 of 5
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